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Fluoxetine: Drug information

Fluoxetine: Drug information
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For additional information see "Fluoxetine: Patient drug information" and "Fluoxetine: Pediatric drug information"

For abbreviations, symbols, and age group definitions show table
ALERT: US Boxed Warning
Suicidality and antidepressant drugs:

Antidepressants increased the risk compared with placebo of suicidal thinking and behavior (suicidality) in short-term studies in children, adolescents, and young adults with major depressive disorder (MDD) and other psychiatric disorders. Anyone considering the use of fluoxetine or any other antidepressant in a child, adolescent, or young adult must balance this risk with the clinical need. Short-term studies did not show an increase in the risk of suicidality with antidepressants compared with placebo in adults older than 24 years; there was a reduction in risk with antidepressants compared with placebo in adults 65 years and older. Depression and certain other psychiatric disorders are themselves associated with increases in the risk of suicide. Appropriately monitor and closely observe patients of all ages who are started on antidepressant therapy for clinical worsening, suicidality, or unusual changes in behavior. Advise families and caregivers of the need for close observation and communication with the prescribing health care provider.

Fluoxetine is approved for use in children with MDD (aged 8 years and older) and obsessive-compulsive disorder (OCD; aged 7 years and older). Sarafem is not approved for use in children.

Brand Names: US
  • PROzac
Brand Names: Canada
  • ACH-FLUoxetine;
  • AG-Fluoxetine;
  • APO-FLUoxetine;
  • Auro-FLUoxetine;
  • BIO-FLUoxetine;
  • DOM-FLUoxetine;
  • JAMP-FLUoxetine;
  • M-FLUoxetine;
  • MINT-FLUoxetine;
  • NRA-Fluoxetine;
  • Odan-FLUoxetine;
  • PMS-FLUoxetine;
  • PRIVA-FLUoxetine [DSC];
  • PRO-FLUoxetine;
  • PROzac [DSC];
  • RIVA-FLUoxetine;
  • TEVA-FLUoxetine
Pharmacologic Category
  • Antidepressant, Selective Serotonin Reuptake Inhibitor
Dosing: Adult

Dosage guidance:

Dosing: Some experts suggest lower starting doses of 5 to 10 mg/day and gradual titration in increments of ≤10 mg, particularly in patients with anxiety who are sensitive to antidepressant-associated overstimulation effects (eg, anxiety, insomnia) (Ref).

Binge eating disorder

Binge eating disorder (off-label use): Oral: Immediate release: Initial: 10 to 20 mg once daily; may increase dose based on response and tolerability in increments of 10 to 20 mg at intervals ≥1 week up to 80 mg/day (Ref).

Bipolar disorder

Bipolar disorder: Depressive episodes: Oral: Immediate release: Initial: 20 mg once daily in the evening in combination with olanzapine (preferred), another second-generation antipsychotic, or antimanic agent; may increase dose in 10 to 20 mg increments every 1 to 7 days (Ref); usual dose range: 20 to 50 mg/day (Ref). May also use the fixed-dose combination instead of the separate components. See Dosing conversion below for conversion to or from olanzapine/fluoxetine fixed-dose combination.

Body dysmorphic disorder

Body dysmorphic disorder (BDD) (off-label use):

Oral: Immediate release: Initial: 20 mg once daily; may increase dose gradually based on response and tolerability in increments of 20 mg every 2 to 3 weeks to a usual dose of 70 to 80 mg/day by week 6 to 10 (Ref). Doses up to 120 mg/day, if tolerated, may be necessary in some patients for optimal response (Ref). Note: An adequate trial for assessment of effect is 12 to 16 weeks, including a dose of 80 mg for at least 4 of those weeks, if needed and tolerated (Ref).

Bulimia nervosa

Bulimia nervosa: Oral: Immediate release: Initial: 20 mg once daily; may increase dose gradually (eg, at intervals ≥1 week) based on response and tolerability in 20 mg increments up to a target dose of 60 mg/day (Ref).

Manufacturer's labeling: Dosing in prescribing information may not reflect current clinical practice. Initial: 60 mg/day.

Fibromyalgia, refractory

Fibromyalgia, refractory (alternative agent) (off-label use):

Note: For patients not responsive to first-line agents (Ref).

Oral: Immediate release: Initial: 20 mg once daily; may increase dose based on response and tolerability in 10 to 20 mg increments at ≥2-week intervals up to 80 mg/day. Mean dose in clinical trials was 45 mg/day (Ref). In patients with an insufficient response to first-line monotherapy, some experts suggest low-dose combination therapy (eg, fluoxetine 20 mg/day with a tricyclic antidepressant) (Ref).

Generalized anxiety disorder

Generalized anxiety disorder (off-label use): Oral: Immediate release: Initial: 10 to 20 mg once daily; may gradually increase dose based on response and tolerability in 10 to 20 mg increments at intervals of ≥1 week up to 60 mg/day (Ref). Doses may be increased every 3 to 4 days if warranted in inpatient settings. Some experts suggest maintaining the initial therapeutic dose 4 to 6 weeks to assess for efficacy before increasing further (Ref).

Major depressive disorder

Major depressive disorder (unipolar): Oral: Immediate release: Initial: 20 mg once daily; may increase dose based on response and tolerability in 20 mg increments at intervals ≥1 week up to a maximum dose of 80 mg/day (Ref). Usual dose: 20 to 60 mg/day (Ref). Note: For treatment-resistant depression, combination with olanzapine or another second-generation antipsychotic may be used; in major depression with psychotic features, fluoxetine plus an antipsychotic is standard treatment (Ref). May consider use of the fixed-dose combination instead of the separate components. See Dosing conversions below for conversion to or from the olanzapine/fluoxetine fixed-dose combination.

Obsessive-compulsive disorder

Obsessive-compulsive disorder: Oral: Immediate release: Initial: 10 to 20 mg once daily; may increase dose gradually in 20 mg increments at intervals ≥1 week based on response and tolerability; recommended range: 40 to 80 mg/day (Ref). Based on clinical experience, some patients may require up to 120 mg/day for a response; however, adverse effects may increase (Ref). Note: An adequate trial for assessment of effect in OCD is considered to be ≥6 weeks at maximum tolerated dose (Ref).

Panic disorder

Panic disorder: Oral: Immediate release: Initial: 5 to 10 mg once daily; after 3 to 7 days, may gradually increase dose based on response and tolerability in 5 to 10 mg increments at intervals ≥1 week up to a usual dose of 20 to 40 mg/day (Ref). Maximum dose: 60 mg/day (Ref). Some experts maintain dose at 20 mg for 4 weeks before considering further dose increases. May require 6 weeks at maximally tolerated dose for adequate treatment trial (Ref).

Posttraumatic stress disorder

Posttraumatic stress disorder (PTSD) (off-label use): Oral: Immediate release: Initial: 10 to 20 mg once daily; may increase dose based on response and tolerability in 10 to 20 mg increments at intervals ≥1 week up to 80 mg/day. Usual dosage range in clinical trials: 20 to 60 mg/day (Ref).

Premature ejaculation

Premature ejaculation (off-label use): Limited data available: Oral: Immediate release: Initial: 20 mg once daily; may increase dose based on response and tolerability after ≥1 week (some experts suggest 3- to 4-week titration intervals (Ref)) to 40 mg once daily (Ref).

Premenstrual dysphoric disorder

Premenstrual dysphoric disorder (PMDD):

Continuous daily dosing regimen: Oral: Immediate release: Initial: 10 mg once daily; increase to usual effective dose of 20 mg once daily over the first month; in a subsequent menstrual cycle, a further increase to 30 mg/day may be necessary in some patients for optimal response (Ref).

Intermittent regimens:

Luteal phase dosing regimen: Oral: Immediate release: Initial: 10 mg once daily during the luteal phase of menstrual cycle only (ie, beginning therapy 14 days before anticipated onset of menstruation and continued to the onset of menses); over the first month, may increase to usual effective dose of 20 mg once daily during the luteal phase; in a subsequent menstrual cycle, a further increase to 30 mg/day during the luteal phase may be necessary in some patients for optimal response (Ref).

Symptom-onset dosing regimen (off-label dosing): Oral: Limited data available: Immediate release: 10 mg once daily from the day of symptom onset until a few days after the start of menses; over the first month, may increase dose based on response and tolerability up to 20 mg/day (Ref).

Social anxiety disorder

Social anxiety disorder (off-label use): Oral: Immediate release: Initial: 10 to 20 mg once daily; after 4 to 6 weeks may gradually increase dose based on response and tolerability in 10 mg increments at intervals of ≥1 week up to 60 mg/day (Ref).

Dosing conversion:

Delayed release (once-weekly formulation): Immediate-release fluoxetine 20 mg/day = delayed-release fluoxetine 90 mg/week. When converting from immediate-release fluoxetine daily dosing, initiate delayed-release fluoxetine (90 mg once weekly) 7 days after the last 20 mg/day dose of immediate-release fluoxetine. Patients must be stabilized on immediate-release fluoxetine 20 mg once daily prior to switching.

Olanzapine/fluoxetine fixed-dose combination: When using individual components of fluoxetine with olanzapine rather than fixed-dose combination product, corresponding approximate dosage equivalents are as follows:

Olanzapine 2.5 mg + fluoxetine 20 mg = combination strength 3/25

Olanzapine 5 mg + fluoxetine 20 mg = combination strength 6/25

Olanzapine 12.5 mg + fluoxetine 20 mg = combination strength 12/25

Olanzapine 5 mg + fluoxetine 50 mg = combination strength 6/50

Olanzapine 12.5 mg + fluoxetine 50 mg = combination strength 12/50

Discontinuation of therapy: When discontinuing antidepressant treatment that has lasted for ≥4 weeks, gradually taper the dose (eg, over 1 to 2 weeks) to minimize withdrawal symptoms and detect re-emerging symptoms (Ref). Reasons for a slower taper (eg, over 4 weeks) include prior history of antidepressant withdrawal symptoms or high doses of antidepressants (Ref). If necessary, some clinicians allow for abrupt discontinuation based on fluoxetine's long half-life (Ref). If intolerable withdrawal symptoms occur, resume the previously prescribed dose and/or decrease dose at a more gradual rate (Ref). Select patients (eg, those with a history of discontinuation syndrome) on long-term treatment (>6 months) may benefit from tapering over >3 months (Ref). Evidence supporting ideal taper rates is limited (Ref).

Switching antidepressants: Evidence for ideal antidepressant switching strategies is limited; strategies include cross-titration (gradually discontinuing the first antidepressant while at the same time gradually increasing the new antidepressant) and direct switch (abruptly discontinuing the first antidepressant and then starting the new antidepressant at an equivalent dose or lower dose and increasing it gradually). Cross-titration (eg, over 1 to 4 weeks depending upon sensitivity to discontinuation symptoms and adverse effects) is standard for most switches, but is contraindicated when switching to or from an MAOI. A direct switch may be an appropriate approach when switching to another agent in the same or similar class (eg, when switching between two SSRIs), when the antidepressant to be discontinued has been used for <1 week, or when the discontinuation is for adverse effects. When choosing the switch strategy, consider the risk of discontinuation symptoms, potential for drug interactions, other antidepressant properties (eg, half-life, adverse effects, and pharmacodynamics), and the degree of symptom control desired. If necessary, some clinicians allow for abrupt discontinuation based on fluoxetine's long half-life (Ref).

Switching to or from an MAOI:

Allow 14 days to elapse between discontinuing an MAOI and initiation of fluoxetine.

Allow 5 weeks to elapse between discontinuing fluoxetine and initiation of an MAOI.

Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.

Dosing: Kidney Impairment: Adult

The renal dosing recommendations are based upon the best available evidence and clinical expertise. Senior Editorial Team: Bruce Mueller, PharmD, FCCP, FASN, FNKF; Jason Roberts, PhD, BPharm (Hons), B App Sc, FSHP, FISAC; Michael Heung, MD, MS.

Altered kidney function: No dosage adjustment necessary for any degree of kidney dysfunction (Ref).

Hemodialysis, intermittent (thrice weekly): Not significantly dialyzed (fluoxetine and its metabolite) (Ref): No supplemental dose or dosage adjustment necessary (Ref).

Peritoneal dialysis: Unlikely to be dialyzed (highly protein bound): No dosage adjustment necessary (Ref).

CRRT: No dosage adjustment necessary (Ref).

PIRRT (eg, sustained, low-efficiency diafiltration): No dosage adjustment necessary (Ref).

Dosing: Liver Impairment: Adult

The liver dosing recommendations are based upon the best available evidence and clinical expertise. Senior Editorial Team: Matt Harris, PharmD, MHS, BCPS, FAST, FCCP; Jeong Park, PharmD, MS, BCTXP, FCCP, FAST; Arun Jesudian, MD; Sasan Sakiani, MD.

Dosage guidance:

Clinical considerations: The elimination half-life of fluoxetine and norfluoxetine are prolonged in liver insufficiency leading to accumulation in Child-Turcotte-Pugh class A and B (Ref). No pharmacokinetic data are available in Child-Turcotte-Pugh class C cirrhosis therefore dosing recommendations are made based on known pharmacokinetics and safety data (Ref).

Liver impairment prior to treatment initiation:

Initial or dose titration in patients with preexisting liver cirrhosis:

Child-Turcotte-Pugh class A to C: Immediate release: Initial: No dosage adjustment necessary; may gradually increase dose based on response and tolerability in ≤10 to 20 mg increments at intervals of ≥2 weeks, not to exceed 50% of the usual recommended indication-specific dose or a maximum of 40 mg/day, whichever is less; use with caution (Ref).

Dosing: Older Adult

Major depressive disorder (unipolar): Oral: Some patients may require an initial dose of 10 mg once daily with dosage increases of 10 to 20 mg every several weeks as tolerated; should not be taken at night unless patient experiences sedation. Refer to adult dosing; use with caution given the long half-life of fluoxetine.

Dosing conversion: Refer to adult dosing.

Discontinuation of therapy: Refer to adult dosing.

Switching antidepressants: Refer to adult dosing.

Dosing: Pediatric

(For additional information see "Fluoxetine: Pediatric drug information")

Dosage guidance:

Dosage form information: When using oral solutions, multiple concentrations may be available (commercially available [4 mg/mL] and compounded solutions [eg, 1 mg/mL, 2 mg/mL]); take precautions to verify appropriate product selection and avoid confusion between the different concentrations; dose should be clearly presented as mg.

Anxiety disorders

Anxiety disorders: Limited data available:

Note: Fluoxetine therapy should be initiated at a low dose with a slow titration to reduce the potential for behavioral activation/agitation that may occur with therapy initiation particularly in younger children. Conservatively, fluoxetine dose titration at 3- to 4-week intervals has been suggested due to its long half-life; however, some patients with more severe symptoms may require more rapid titration; in trials, dose titration in weekly increments has been reported (Ref).

Generalized anxiety, separation anxiety, panic disorders:

Note: In pediatric patients, selective serotonin reuptake inhibitor (SSRI) therapy is considered first-line pharmacologic treatment for moderate to severe anxiety disorders in combination with cognitive behavioral therapy (CBT); of the SSRIs with positive pediatric data evaluated in the AHRQ/Mayo review (fluoxetine, fluvoxamine, paroxetine, and sertraline), a preferred SSRI has not been defined; therapeutic selection should be based on pharmacokinetic and pharmacodynamic data, patient tolerability, cost, and unique risks/precautions with specific agents (Ref).

Children 6 to <12 years: Oral: Immediate release: Initial: 5 mg once daily, may slowly titrate as needed; suggested target dose range: 10 to 20 mg once daily; maximum daily dose: 40 mg/day (Ref).

Children ≥12 years and Adolescents: Oral: Immediate release: Initial: 10 mg once daily, may slowly titrate as needed; suggested target dose range: 20 to 40 mg once daily; usual maximum daily dose: 60 mg/day although use of doses up to 80 mg/day has been reported (Ref).

Selective mutism:

Limited data available: Children ≥5 years and Adolescents: Oral: Immediate release: Initial: 5 or 10 mg once daily for ≥7 days, then increase by doubling dose to 10 or 20 mg once daily for 7 days; may further titrate in 20 mg/day increments, if needed, every 2 weeks; maximum daily dose: 60 mg/day (Ref). Dosing is based on an open-label study of 21 pediatric patients (age: 5 to 14 years); positive responses were reported in 76% of patients and required a dose of at least 20 mg/day; mean final dose: 28.1 mg/day (1.1 mg/kg/day) (Ref) and a small (n= 5) single-case design, placebo-controlled trial (ages: 5 to 14 years) with a final dose of 20 mg/day (Ref). To fully assess therapeutic response, a therapeutic trial of at least 9 to 12 weeks or longer has been suggested (Ref).

Anorexia nervosa

Anorexia nervosa: Limited data available; efficacy results variable:

Note: Use in combination with psychosocial intervention or CBT; SSRI antidepressants have not been shown effective during the acute phases of illness; however, they may be considered for comorbid mental health conditions once weight has been restored (Ref).

Adolescents: Oral: Immediate release: Initial: 20 mg once daily; may titrate in 20 mg increments (similar to other indications in adolescents) at monthly intervals; typical reported dosing range: 20 to 40 mg/day; reported maximum daily dose: 60 mg/day (Ref). Dosing based on a small, prospective, double-blind, placebo-controlled trial of 35 patients (fluoxetine: n=16; mean age: 23 ± 9 years) which showed reduced relapse (increased weight, decrease in symptoms) with 1 year of fluoxetine and mean dose of 38 ± 21 mg/day (Ref). Other randomized controlled trials with similar dosing have not shown fluoxetine therapy effective (Ref).

Bulimia nervosa

Bulimia nervosa: Limited data available: Note: Antidepressant therapy is recommended to target symptoms of obsessionality, anxiety, and depression in combination with CBT (Ref).

Children ≥12 years and Adolescents: Oral: Immediate release: Initial: 20 mg once daily for 3 days, then 40 mg once daily for 3 days, then 60 mg once daily; dosing based on an open-label study of 10 pediatric patients (age: 12 to 18 years) which showed significant decrease in number of weekly purges; other reports describe use in adolescents (Ref).

Depression

Depression:

Note: In the management of depression in children and adolescents, if pharmacotherapy is deemed necessary with/without psychotherapeutic interventions, an SSRI should be used first-line; fluoxetine has the strongest efficacy evidence and is preferred as first-line SSRI option in absence of drug-drug interactions, risk factors for bipolar comorbidity, or family (eg, parent, sibling) history of poor response to fluoxetine (Ref). Therapy should be initiated at a low dose and titrated every 1 to 2 weeks (Ref).

Children 8 to <12 years: Oral: Immediate release: Initial: 5 or 10 mg once daily; usual daily dose: 10 mg once daily; if needed, may increase dose to 20 mg once daily after 1 to 2 weeks; some pediatric patients may require higher doses up to 40 mg/day; maximum daily dose: 40 mg/day (Ref).

Children ≥12 years and Adolescents: Oral: Immediate release: Initial: 10 to 20 mg once daily; may increase in 10 to 20 mg increments every 1 to 2 weeks; usual effective dose: 20 to 40 mg once daily; maximum daily dose: 60 mg/day (Ref).

Depression associated with bipolar I disorder

Depression associated with bipolar I disorder (in combination with olanzapine):

Children ≥10 years and Adolescents: Oral: Immediate release: Initial: 20 mg in the evening; adjust dose, if needed, as tolerated; safety of fluoxetine doses >50 mg in combination with doses >12 mg of olanzapine has not been studied in pediatrics.

Note: When using individual components of fluoxetine with olanzapine rather than fixed-dose combination product (Symbyax), approximate dosage correspondence is as follows:

Olanzapine 2.5 mg + fluoxetine 20 mg = Symbyax 3/25.

Olanzapine 5 mg + fluoxetine 20 mg = Symbyax 6/25.

Olanzapine 12.5 mg + fluoxetine 20 mg = Symbyax 12/25.

Olanzapine 5 mg + fluoxetine 50 mg = Symbyax 6/50.

Olanzapine 12.5 mg + fluoxetine 50 mg = Symbyax 12/50.

Obsessive-compulsive disorder

Obsessive-compulsive disorder (OCD):

Note: In the management of OCD in children and adolescents, if pharmacotherapy deemed necessary it should be in combination with CBT and an SSRI should be used first-line; a preferred agent has not been identified (Ref).

Children preschool to <7 years: Limited data available:

Note: Use should be reserved for patients with moderate to severe symptoms which cause significant distress or significant impairment in the child's relationships, daily routine at home, or child care setting, and continue despite psychotherapeutic interventions (Ref).

Oral: Immediate release: 2.5 to 5 mg once daily initially; continue for 10 to 12 weeks to assess initial response; monitor closely (Ref).

Children ≥7 years and Adolescents: Oral: Immediate release (Ref).

Lower weight Children: Initial: 5 to 10 mg once daily; if needed, may increase dose after several weeks; usual daily dose: 20 to 30 mg/day; minimal experience with doses >20 mg/day; no experience with doses >60 mg/day.

Higher weight Children and Adolescents: Initial: 10 mg once daily; increase dose to 20 mg once daily after 2 weeks; may increase dose after several more weeks; usual daily dose: 20 to 60 mg/day; however, doses of 80 mg/day may be considered in some cases.

Discontinuation of therapy: Consider planning antidepressant discontinuation for lower-stress times, recognizing non-illness-related factors could cause stress or anxiety and be misattributed to antidepressant discontinuation (Ref). Upon discontinuation of antidepressant therapy, gradually taper the dose to minimize the incidence of discontinuation syndromes (withdrawal) and allow for the detection of reemerging disease state symptoms (eg, relapse). Evidence supporting ideal taper rates after illness remission is limited. APA and NICE guidelines suggest tapering therapy over at least several weeks with consideration to the half-life of the antidepressant; antidepressants with a shorter half-life may need to be tapered more conservatively. After long-term (years) antidepressant treatment, WFSBP guidelines recommend tapering over 4 to 6 months, with close monitoring during and for 6 months after discontinuation. If intolerable discontinuation symptoms occur following a dose reduction, consider resuming the previously prescribed dose and/or decrease dose at a more gradual rate (Ref).

Switching antidepressants: Evidence for ideal antidepressant switching strategies in pediatric patients is sparse; strategies described in pediatric guidelines include a conservative approach (tapering and discontinuing the first SSRI before adding the second) and cross-titration (gradually discontinuing the first antidepressant while at the same time gradually increasing the new antidepressant). While consensus does not exist regarding which approach to utilize, it is important to note that the conservative approach runs the risk for exacerbation of symptoms or discontinuation syndrome; cross-titration may avoid these risks (Ref). Cross-titration (eg, over 1 to 4 weeks depending upon sensitivity to discontinuation symptoms and adverse effects) is standard for most switches, but is contraindicated when switching to or from a monamine oxidase inhibitors. While not as common of a strategy, a direct switch may be considered when switching to another agent in the same or similar class (eg, when switching between 2 SSRIs), when the antidepressant to be discontinued has been used for <1 week, or when the discontinuation is for adverse effects. When choosing the switch strategy, consider the risk of discontinuation symptoms, potential for drug interactions, other antidepressant properties (eg, half-life, adverse effects, pharmacodynamics), and the degree of symptom control desired (Ref).

Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.

Dosing: Kidney Impairment: Pediatric

Children ≥7 years and Adolescents: Adjustment not routinely needed. With chronic administration, additional accumulation of fluoxetine or norfluoxetine may occur in patients with severely impaired renal function. Based on experience in adult patients, not removed by hemodialysis; use of lower dose or less frequent dosing is not usually necessary.

Dosing: Liver Impairment: Pediatric

Children ≥7 years and Adolescents: Elimination half-life of fluoxetine is prolonged in patients with hepatic impairment; lower doses or less frequent administration are recommended.

Adverse Reactions (Significant): Considerations
Activation of mania or hypomania

Antidepressants (when used as monotherapy) may precipitate a mixed/manic episode in patients with bipolar disorder. Treatment-emergent mania or hypomania in patients with unipolar major depressive disorder (MDD) have been reported, as many cases of bipolar disorder present in episodes of MDD (Ref). In addition, treatment-emergent mania or hypomania has been described in patients receiving antidepressants, including selective serotonin reuptake inhibitors, for the treatment of obsessive-compulsive disorder (OCD) without a history of bipolar disorder (with or without comorbid MDD) (Ref).

Mechanism: Non-dose-related; idiosyncratic. Unclear to what extent mood switches represent an uncovering of unrecognized bipolar disorder or a more direct pharmacologic effect independent of diagnosis (Ref).

Onset: Varied; a systematic review observed that the risk of switching increased significantly within the initial 2 years of antidepressant treatment in patients with unipolar MDD receiving an antidepressant as monotherapy, but not thereafter (up to 4.6 years) (Ref). In a systematic review of patients with OCD who experienced switching, the manic/hypomanic episodes were more common within 12 weeks of antidepressant treatment initiation; however, episodes occurred up to 9 months in these patients (Ref).

Risk factors:

• Family history of bipolar disorder (Ref)

• Depressive episode with psychotic symptoms (Ref)

• Younger age at onset of depression (Ref)

• Antidepressant resistance (Ref)

• Females (Ref)

Bleeding risk

Selective serotonin reuptake inhibitors (SSRIs), including fluoxetine, may increase the risk of bleeding, particularly if used concomitantly with antiplatelets and/or anticoagulants in adult and pediatric patients. Multiple observational studies have found an association with SSRI use and a variety of bleeding complications, ranging from bruise, hematoma, petechia, purpuric disease, and epistaxis to cerebrovascular accident, upper gastrointestinal hemorrhage, intracranial hemorrhage, postpartum hemorrhage (exposure during late gestation), and intraoperative bleeding, although conflicting evidence also exists (Ref).

Mechanism: Possibly via decreased platelet serotonin concentrations and inhibition of serotonin-mediated platelet activation leading to subsequent platelet dysfunction. Fluoxetine is considered to display high affinity for the serotonin receptor (Ref). SSRIs may also increase gastric acidity, which can increase the risk of GI bleeding (Ref).

Onset: Varied; bleeding risk is likely delayed for several weeks until SSRI-induced platelet serotonin depletion becomes clinically significant (Ref); although the onset of bleeding may be more unpredictable if patients are taking concomitant antiplatelets, anticoagulants, or nonsteroidal anti-inflammatory drugs (NSAIDs). For upper GI bleeding, some studies have found risk to be the highest in the first 28 to 30 days (Ref), whereas another study reported a median time of onset of 25 weeks (Ref).

Risk factors:

Concomitant use of anticoagulants and/or antiplatelets (Ref)

Preexisting platelet dysfunction or coagulation disorders (eg, von Willebrand factor) (Ref)

Concomitant use of NSAIDs increase the risk for upper GI bleeding (Ref)

Fragility fractures

Limited data from observational studies involving mostly older adults (≥50 years of age) suggest selective serotonin reuptake inhibitors (SSRIs) are associated with an increased risk of bone fractures (Ref). In addition, several trials and subsequent meta-analyses have found an increased risk of bone fracture with the use of SSRIs in stroke survivors (Ref).

Mechanism: Time-related; mechanism not fully elucidated; postulated to be through a direct effect by SSRIs on bone metabolism via interaction with 5-HT and osteoblast, osteocyte, and/or osteoclast activity (Ref). SSRIs may also contribute to fall risk, contributing to the incidence of fractures (Ref). An increased tendency to fall may also contribute to the increased risk of fractures associated with SSRIs (Ref).

Onset: Delayed; risk appears to increase after initiation and may continue to increase with long-term use. A meta-analysis found risk of fracture increased from 2.9% over 1 year to 5.4% over 2 years; within 5 years, risk increased to 13.4% (Ref). Conversely, the increased risk of bone fracture in stroke survivors who received an SSRI (fluoxetine) was no longer statistically significant at 12 months post stroke (Ref).

Risk factors:

Long-term use may be a risk factor (Ref)

Hypersensitivity reactions

A wide variety of hypersensitivity reactions have been reported rarely with fluoxetine, including severe systemic reactions; reactions include dermatitis, urticaria, angioedema, eosinophilia, Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), serum-like sickness reaction, vasculitis (eg, leukocytoclastic vasculitis, Henoch-Schönlein purpura), and certain pulmonary inflammatory diseases (eg, hypersensitivity pneumonitis, pulmonary granuloma) (Ref).

Mechanism: Non-dose-related; immunologic. Severe cutaneous adverse reactions, namely SJS/TEN, DRESS, acute generalized exanthematous pustulosis), are delayed type IV hypersensitivity reactions involving a T-cell mediated drug-specific immune response (Ref).

Onset: Intermediate; in the majority of cases, onset of symptoms generally occurred from 1 to 4 weeks after initiation of therapy (Ref).

Risk factors:

• Females (Ref)

• Cross-reactivity between selective serotonin reuptake inhibitors has not been established but has been reported between paroxetine and sertraline (Ref)

Hyponatremia

Selective serotonin reuptake inhibitors (SSRIs) are associated with syndrome of inappropriate antidiuretic hormone secretion (SIADH) and/or hyponatremia, including severe cases, predominantly in older adults (Ref). Hyponatremia is reversible with discontinuation of therapy (Ref).

Mechanism: May cause SIADH via release of antidiuretic hormone (ADH) (Ref) or may cause nephrogenic SIADH by increasing the sensitivity of the kidney to ADH (Ref).

Onset: Intermediate; usually develops within the first few weeks of treatment with an SSRI (Ref).

Risk factors:

• Older age (Ref)

• Females (Ref)

• Concomitant use of diuretics (Ref)

• Low body weight (Ref)

• Lower baseline serum sodium concentration (Ref)

• Volume depletion (Ref)

• History of hyponatremia (potential risk factors) (Ref)

• Symptoms of psychosis (potential risk factors) (Ref)

Ocular effects

Selective serotonin reuptake inhibitors (SSRIs) are associated with acute angle-closure glaucoma (AACG) in case reports and a case-controlled study. AACG may cause symptoms including eye pain, changes in vision, swelling, and redness, which can rapidly lead to permanent blindness if not treated (Ref). In addition, SSRIs may be associated with an increased risk of cataract development (Ref).

Mechanism: AACG: Unclear; hypothesized SSRIs may increase the intraocular pressure via serotonergic effects on ciliary body muscle activation and pupil dilation (Ref).

Risk factors:

For AACG:

Females (Ref)

≥50 years of age (slight increase) (Ref)

Hyperopia (slight increase) (Ref)

Personal or family history of AACG (Ref)

Inuit or Asian descent (Ref)

Serotonin syndrome

Serotonin syndrome has been reported and typically occurs with coadministration of multiple serotonergic drugs but can occur following a single serotonergic agent at therapeutic doses, particularly with fluoxetine use (Ref). The diagnosis of serotonin syndrome is made based on the Hunter Serotonin Toxicity Criteria (Ref) and may result in a spectrum of symptoms, such as anxiety, agitation, confusion, delirium, hyperreflexia, muscle rigidity, myoclonus, tachycardia, tachypnea, and tremor. Severe cases may cause hyperthermia, significant autonomic instability (ie, rapid and severe changes in blood pressure and pulse), coma, and seizures (Ref).

Mechanism: Dose-related; overstimulation of serotonin receptors by serotonergic agents (Ref).

Onset: Rapid; in the majority of cases (74%), onset occurred within 24 hours of treatment initiation, overdose, or change in dose (Ref).

Risk factors:

• Concomitant use of drugs that increase serotonin synthesis, block serotonin reuptake and/or impair serotonin metabolism (eg, monoamine oxidase inhibitors [MAOIs]). Of note, concomitant use of some serotonergic agents, such as MAOIs, are contraindicated.

Sexual dysfunction

Selective serotonin reuptake inhibitors (SSRIs) are commonly associated with sexual disorders in both men and women. The following adverse reactions have been associated with SSRI use: Ejaculatory delay, orgasm disturbance, anorgasmia, erectile dysfunction, decreased libido, and loss of libido (Ref). Priapism and decreased genital anesthesia have also been reported (Ref).

Mechanism: Dose-related (Ref); increases in serotonin may affect other hormones and neurotransmitters involved in sexual function; in particular, testosterone's effect on sexual arousal and dopamine's role in achieving orgasm (Ref).

Onset: Varied; one longitudinal study observed an onset of sexual dysfunction within the first 6 weeks of treatment with fluoxetine (Ref).

Risk factors:

• Depression (sexual dysfunction is commonly associated with depression; SSRI-associated sexual dysfunction may be difficult to differentiate in treated patients) (Ref)

Suicidal thinking and behavior

Antidepressants are associated with an increased risk of suicidal ideation and suicidal tendencies in pediatric and young adult patients (18 to 24 years of age) in short-term studies. In adults >24 years of age, short-term studies did not show an increased risk of suicidal thinking and behavior, and in older adults ≥65 years of age a decreased risk was observed. Although data have yielded inconsistent results regarding the association of antidepressants and risk of suicide, particularly among adults, collective evidence shows a trend of an elevated risk of suicidality in younger age groups (Ref). Of note, the risk of a suicide attempt is inherent in major depression and may persist until remission occurs.

Mechanism: Not established; one of several postulated mechanisms is antidepressants may energize suicidal patients to act on impulses; another suggests that antidepressants may produce a worsening of depressive symptoms leading to the emergence of suicidal thoughts and actions (Ref).

Onset: Varied; increased risk observed in short-term studies (ie, <4 months) in pediatric and young adults; it is unknown whether this risk extends to longer-term use (ie, >4 months).

Risk factors:

• Children and adolescents (Ref)

• Depression (risk of suicide associated with major depression and may persist until remission occurs)

Withdrawal syndrome

Withdrawal syndrome, consisting of both somatic symptoms (eg, dizziness, chills, light-headedness, vertigo, shock-like sensations, paresthesia, fatigue, headache, nausea, tremor, diarrhea, visual disturbances) and psychological symptoms (eg, anxiety, agitation, confusion, insomnia, irritability, mania), have been reported, primarily following abrupt discontinuation. Withdrawal symptoms may also occur following gradual tapering (Ref).

Mechanism: Withdrawal; due to reduced availability of serotonin in the CNS with decreasing levels of the selective serotonin reuptake inhibitor. Other neurotransmission systems, including increased glutamine and dopamine, may also be affected as well as the hypothalamic-pituitary-adrenal axis (Ref).

Onset: Intermediate; expected onset is 1 to 10 days (following either abrupt or tapered discontinuation) (Ref).

Risk factors:

• Abrupt discontinuation (rather than dose taper) or tapering the antidepressant too quickly (Ref)

• Drugs with a half-life <24 hours (eg, paroxetine, venlafaxine) (Ref)

• Higher doses (Ref)

• Longer duration of treatment (eg, ≥4 weeks) (Ref)

• Prior history of antidepressant withdrawal symptoms (Ref)

Adverse Reactions

The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified. As reported in adults, unless otherwise noted.

>10%:

Endocrine & metabolic: Decreased libido (1% to 11%) (table 1)

Fluoxetine: Adverse Reaction: Decreased Libido

Drug (Fluoxetine)

Placebo

Indication

Number of Patients (Fluoxetine)

Number of Patients (Placebo)

5%

1%

Bulimia

450

267

3%

N/A

MDD

1728

975

11%

2%

OCD

266

89

1%

2%

Panic disorder

425

342

Gastrointestinal: Anorexia (4% to 17%), diarrhea (8% to 18%), nausea (12% to 29%), xerostomia (9% to 12%)

Genitourinary: Sexual disorder (literature suggests an incidence ranging from 54% to 58%; can persist after discontinuation) (Ref)

Nervous system: Anxiety (6% to 15%), asthenia (9% to 21%), drowsiness (5% to 17%; literature suggests it is more common in adults compared to children and adolescents) (Ref), headache (21%), insomnia (10% to 33%), nervousness (8% to 14%), tremor (3% to 13%), yawning (≤11%)

Respiratory: Pharyngitis (10% to 11%)

1% to 10%:

Cardiovascular: Chest pain (≥1%), hypertension (≥1%), palpitations (≥1%), prolonged QT interval on ECG (≥1%; QTcF ≥450 msec3), vasodilation (1% to 5%)

Dermatologic: Diaphoresis (7% to 8%), pruritus (3%), skin rash (2% to 6%) (table 2)

Fluoxetine: Adverse Reaction: Skin Rash

Drug (Fluoxetine)

Placebo

Indication

Number of Patients (Fluoxetine)

Number of Patients (Placebo)

4%

4%

Bulimia

450

267

4%

3%

MDD

1728

975

6%

3%

OCD

266

89

2%

2%

Panic disorder

425

342

Endocrine & metabolic: Heavy menstrual bleeding (children, adolescents: ≥2%), increased thirst (children, adolescents: ≥2%), weight loss (2%)

Gastrointestinal: Constipation (5%), dysgeusia (≥1%), dyspepsia (6% to 10%), flatulence (3%), increased appetite (≥1%), vomiting (3%; literature suggests prevalence is higher in adolescents compared to adults and is two- to threefold more prevalent in children compared to adults) (Ref)

Genitourinary: Ejaculatory disorder (2% to 7%) (table 3), erectile dysfunction (≤7%), urinary frequency (children, adolescents: ≥2%), urination disorder (≥1%)

Fluoxetine: Adverse Reaction: Ejaculatory Disorder

Drug (Fluoxetine)

Placebo

Indication

Number of Patients (Fluoxetine)

Number of Patients (Placebo)

7%

N/A

Bulimia

14

1

7%

N/A

OCD

116

43

2%

1%

Panic disorder

162

121

Nervous system: Abnormal dreams (5%), agitation (children, adolescents: ≥2%), amnesia (≥1%), changes in thinking (2%), chills (≥1%), dizziness (9%), emotional lability (≥1%), personality disorder (children, adolescents: ≥2%), sleep disturbance (≥1%)

Neuromuscular & skeletal: Hyperkinetic muscle activity (children, adolescents: ≥2%)

Ophthalmic: Visual disturbance (2%)

Otic: Otalgia (≥1%), tinnitus (≥1%)

Respiratory: Epistaxis (children, adolescents: ≥2%), flu-like symptoms (8% to 10%), sinusitis (5% to 6%)

<1%:

Cardiovascular: Acute myocardial infarction, angina pectoris, cardiac arrhythmia, edema, heart failure, hypotension, orthostatic hypotension, syncope, vasculitis

Dermatologic: Acne vulgaris, alopecia, ecchymoses, purpuric rash, skin photosensitivity

Endocrine & metabolic: Albuminuria, amenorrhea, hypercholesterolemia, hypothyroidism, increased libido

Gastrointestinal: Aphthous stomatitis, bloody diarrhea, bruxism, cholelithiasis, colitis, duodenal ulcer, esophageal ulcer, gastritis, gastroenteritis, gastrointestinal ulcer, glossitis, hematemesis, melena, peptic ulcer

Genitourinary: Gynecological bleeding

Hematologic & oncologic: Anemia, petechia

Hepatic: Abnormal hepatic function tests, hepatitis

Nervous system: Akathisia, ataxia, balance impairment, delusion, depersonalization, euphoria, extrapyramidal reaction, hostility, hypertonia, migraine, myoclonus, paranoid ideation, suicidal tendencies

Neuromuscular & skeletal: Arthritis, bursitis, gout, lower limb cramp, ostealgia

Ophthalmic: Mydriasis

Respiratory: Asthma, laryngeal edema

Postmarketing:

Cardiovascular: Atrial fibrillation, pulmonary embolism, ventricular tachycardia (including torsades de pointes) (Ref)

Dermatologic: Dermatitis (Ref), erythema multiforme, erythema nodosum, exfoliative dermatitis, psoriasis (new onset) (Ref), Stevens-Johnson syndrome (Ref), toxic epidermal necrolysis (Ref)

Endocrine & metabolic: Galactorrhea not associated with childbirth, gynecomastia, hyperprolactinemia, hypoglycemia, hypokalemia, hyponatremia (literature suggests incidence among selective serotonin reuptake inhibitors [SSRIs] ranges from <1% to as high as 32%) (Ref), SIADH (Ref)

Gastrointestinal: Esophagitis, pancreatitis, upper gastrointestinal hemorrhage (Ref)

Genitourinary: Anorgasmia (Ref), priapism (Ref), sexual difficulty (decreased genital sensation) (Ref)

Hematologic & oncologic: Aplastic anemia, bruise (Ref), hemolytic anemia (immune-related), Henoch-Schönlein purpura (Ref), immune thrombocytopenia, pancytopenia, thrombocytopenia (Ref)

Hepatic: Cholestatic jaundice, hepatic failure, hepatic necrosis, hepatotoxicity (Ref)

Hypersensitivity: Drug reaction with eosinophilia and systemic symptoms (Ref), hypersensitivity reaction (Ref), nonimmune anaphylaxis, serum sickness-like reaction (Ref)

Nervous system: Anosmia (including hyposmia), cerebrovascular accident, hallucination, hyperactive behavior (including agitation, hyperactivation, hyperkinesis, restlessness; occurring in children at a two- to threefold higher incidence compared to adolescents) (Ref), hypomania (Ref), mania (Ref), memory impairment (Ref), neuroleptic malignant syndrome, obsessive compulsive disorder (worsening symptoms of trichotillomania) (Ref), seizure (Ref), serotonin syndrome (Ref), suicidal ideation (Ref), violent behavior

Neuromuscular & skeletal: Dyskinesia (Ref), dystonia (Ref), laryngospasm, linear skeletal growth rate below expectation (children) (Ref), lupus-like syndrome, tardive dyskinesia (Ref)

Ophthalmic: Acute angle-closure glaucoma (Ref), cataract, optic neuritis

Renal: Kidney failure

Respiratory: Eosinophilic pneumonitis, hypersensitivity pneumonitis (Ref), hyperventilation, pulmonary fibrosis, pulmonary granuloma (Ref), pulmonary hypertension

Contraindications

Hypersensitivity to fluoxetine or any component of the formulation; use of monoamine oxidase inhibitors (MAOIs) intended to treat psychiatric disorders (concurrently, within 5 weeks of discontinuing fluoxetine, or within 2 weeks of discontinuing the MAOI); initiation of fluoxetine in a patient receiving IV methylene blue; use with pimozide or thioridazine (Note: Thioridazine should not be initiated until 5 weeks after the discontinuation of fluoxetine).

Note: Although fluoxetine is contraindicated per the manufacturer labeling when used in combination with linezolid, new evidence suggests that the combination is unlikely to cause serotonin syndrome (0.06% to 3% risk), and therefore these agents can be administered concomitantly when necessary. Monitor patients on this combination; average duration of serotonin toxicity is ~4 days; however, risks may be greater with longer durations of concurrent therapy. Educate patients on the signs and symptoms of serotonin syndrome (Bai 2022; Butterfield 2012; Karkow 2017; Kufel 2023; Narita 2007; Taylor 2006).

Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.

Canadian labeling: Additional contraindications (not in the US labeling): Initiation of fluoxetine within 2 weeks of thioridazine discontinuation

Warnings/Precautions

Concerns related to adverse effects:

• CNS depression: Has a low potential to impair cognitive or motor performance; caution operating hazardous machinery or driving.

• QT prolongation: QT prolongation and ventricular arrhythmia, including torsades de pointes, have occurred. Use with caution in patients with risk factors for QT prolongation (eg, congenital long QT syndrome, history of prolonged QT, family history of prolonged QT or sudden cardiac death), other conditions that predispose to arrhythmias (eg, hypokalemia, hypomagnesemia, recent myocardial infarction [MI], uncompensated heart failure, bradyarrhythmias or other arrhythmias, concomitant use of other agents that prolong QT interval), or increased fluoxetine exposure (eg, overdose, hepatic impairment, use of CYP2D6 inhibitors, poor CYP2D6 metabolizer status, concomitant use of other highly protein-bound drugs). Consider ECG monitoring when initiating therapy in patients with risk factors for QT prolongation and ventricular arrhythmia. Consider discontinuing fluoxetine if ventricular arrhythmia suspected and initiate cardiac evaluation.

Disease-related concerns:

• Bariatric surgery: Presurgical assessment of the indication for use, symptoms, and goals of therapy should be documented to enable postsurgical assessment. A small pharmacokinetic study identified alterations in fluoxetine exposure postsurgery (Garin 2023). Monitor for continued efficacy after bariatric surgery and consider switching to an alternate medication if symptoms worsen.

• Cardiovascular disease: Use with caution in patients with a history of MI or unstable heart disease; experience in these patients is limited.

• Hepatic impairment: Use with caution in patients with hepatic impairment; clearance is decreased and half-life and plasma concentrations are increased; a lower dosage may be needed in patients with cirrhosis. However, selective serotonin reuptake inhibitors such as fluoxetine are considered the safest antidepressants to use in chronic liver disease because of their relative lack of side effects and high therapeutic index (Mullish 2014).

• Seizure disorders: Use with caution in patients with a previous seizure disorder or conditions predisposing to seizures such as brain damage or alcoholism.

Special populations:

• Older adult: May also cause agitation, sleep disturbances, and excessive CNS stimulation in older adults. Given the long half-life and nonlinear disposition of the drug, use caution, particularly if they have systemic illness or are receiving multiple drugs for concomitant diseases.

Dosage form specific issues:

• Benzyl alcohol and derivatives: Some dosage forms may contain sodium benzoate/benzoic acid; benzoic acid (benzoate) is a metabolite of benzyl alcohol; large amounts of benzyl alcohol (≥99 mg/kg/day) have been associated with a potentially fatal toxicity (“gasping syndrome”) in neonates; the “gasping syndrome” consists of metabolic acidosis, respiratory distress, gasping respirations, CNS dysfunction (including convulsions, intracranial hemorrhage), hypotension, and cardiovascular collapse (AAP ["Inactive" 1997]; CDC 1982); some data suggest that benzoate displaces bilirubin from protein binding sites (Ahlfors 2001); avoid or use dosage forms containing benzyl alcohol derivative with caution in neonates. See manufacturer's labeling.

Other warnings/precautions:

• Long half-life: Due to the long half-life of fluoxetine and its metabolites, the effects and interactions noted may persist for prolonged periods following discontinuation.

Dosage Forms: US

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Capsule, Oral:

PROzac: 10 mg, 20 mg, 40 mg

Generic: 10 mg, 20 mg, 40 mg

Capsule Delayed Release, Oral:

Generic: 90 mg

Solution, Oral:

Generic: 20 mg/5 mL (5 mL, 120 mL)

Tablet, Oral:

Generic: 10 mg, 20 mg, 60 mg

Generic Equivalent Available: US

Yes

Pricing: US

Capsule, delayed release (FLUoxetine HCl Oral)

90 mg (per each): $39.21

Capsules (FLUoxetine HCl Oral)

10 mg (per each): $0.07 - $2.60

20 mg (per each): $0.07 - $2.67

40 mg (per each): $0.91 - $5.34

Capsules (PROzac Oral)

10 mg (per each): $17.03

20 mg (per each): $17.51

40 mg (per each): $30.41

Solution (FLUoxetine HCl Oral)

20 mg/5 mL (per mL): $0.98 - $2.50

Tablets (FLUoxetine HCl (PMDD) Oral)

10 mg (per each): $17.41

20 mg (per each): $17.41

Tablets (FLUoxetine HCl Oral)

10 mg (per each): $2.87 - $2.97

20 mg (per each): $4.20 - $4.56

60 mg (per each): $10.44 - $12.19

Disclaimer: A representative AWP (Average Wholesale Price) price or price range is provided as reference price only. A range is provided when more than one manufacturer's AWP price is available and uses the low and high price reported by the manufacturers to determine the range. The pricing data should be used for benchmarking purposes only, and as such should not be used alone to set or adjudicate any prices for reimbursement or purchasing functions or considered to be an exact price for a single product and/or manufacturer. Medi-Span expressly disclaims all warranties of any kind or nature, whether express or implied, and assumes no liability with respect to accuracy of price or price range data published in its solutions. In no event shall Medi-Span be liable for special, indirect, incidental, or consequential damages arising from use of price or price range data. Pricing data is updated monthly.

Dosage Forms: Canada

Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product

Capsule, Oral:

PROzac: 10 mg [DSC], 20 mg [DSC] [contains butylparaben, edetate (edta) calcium disodium, fd&c blue #1 (brilliant blue), methylparaben, propylparaben]

Generic: 10 mg, 20 mg, 40 mg, 60 mg

Solution, Oral:

Generic: 20 mg/5 mL (120 ea, 120 mL)

Administration: Adult

Oral: Administer without regard to meals.

Bariatric surgery: Fluoxetine is available as a delayed-release formulation and the release characteristics may be significantly altered in an unknown manner in patients who have undergone bariatric surgery; providers should determine if the condition being treated can be safely monitored or if a switch to an alternate formulation is necessary (Ref). Fluoxetine is also available as IR formulations.

Administration: Pediatric

Oral: May be administered without regard to food. For most pediatric uses (ie, anxiety, obsessive-compulsive disorder, depression, anorexia, bulimia), doses should be administered in the morning. When used concomitantly with olanzapine for bipolar I disorder and treatment-resistant depression, doses should be administered in the evening.

Medication Guide and/or Vaccine Information Statement (VIS)

An FDA-approved patient medication guide, which is available with the product information and as follows, must be dispensed with this medication:

Fluoxetine tablets: https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/202133s009s016lbl.pdf#page=36

Prozac: https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/018936%20s112lbl.pdf#page=26

Sarafem: https://www.accessdata.fda.gov/drugsatfda_docs/label/2021/021860s015lbl.pdf#page=32

Use: Labeled Indications

Bipolar disorder (excluding Sarafem): As an adjunct to olanzapine (preferred), other antipsychotics, or antimanic agents for the treatment of depressive episodes associated with bipolar disorder (WFSBP [Grunze 2010]; manufacturer’s labeling).

Bulimia nervosa (excluding Sarafem): Acute and maintenance treatment of binge eating and vomiting behaviors in patients with moderate to severe bulimia nervosa.

Major depressive disorder (unipolar) (excluding Sarafem): Acute and maintenance treatment of unipolar major depressive disorder (MDD). Also, approved for acute treatment of treatment-resistant unipolar depression (patients with unipolar MDD who do not respond to 2 separate trials of different antidepressants of adequate dose and duration in the current episode) in combination with olanzapine or other antipsychotics (APA 2010).

Obsessive-compulsive disorder (excluding Sarafem): Acute and maintenance treatment of obsessions and compulsions in patients with obsessive-compulsive disorder.

Panic disorder (excluding Sarafem): Acute treatment of panic disorder with or without agoraphobia.

Premenstrual dysphoric disorder (Sarafem only): Treatment of premenstrual dysphoric disorder.

Use: Off-Label: Adult

Binge eating disorder; Body dysmorphic disorder; Fibromyalgia, refractory; Generalized anxiety disorder; Posttraumatic stress disorder; Premature ejaculation; Selective mutism; Social anxiety disorder

Medication Safety Issues
Sound-alike/look-alike issues:

FLUoxetine may be confused with DULoxetine, famotidine, Feldene, fluconazole, fluvastatin, fluvoxaMINE, fosinopril, furosemide, Loxitane [DSC], PARoxetine, thiothixene, vortioxetine

PROzac may be confused with Paxil, Prelone, PriLOSEC, Prograf, Proscar, ProSom, Provera

Older Adult: High-Risk Medication:

Beers Criteria: Selective Serotonin Reuptake Inhibitors (SSRIs) are identified in the Beers Criteria as a potentially inappropriate medications to be used with caution in patients 65 years and older due to the potential to cause or exacerbate syndrome of inappropriate antidiuretic hormone secretion (SIADH) or hyponatremia; monitor sodium concentration closely when initiating or adjusting the dose in older adults (Beers Criteria [AGS 2023]).

Fluoxetine is identified in the Screening Tool of Older Person's Prescriptions (STOPP) criteria as a potentially inappropriate medication in older adults (≥65 years of age) with a history of recurrent falls due to an increased risk of falls. In addition, some disease states of concern include hyponatremia and recent or current significant bleeding (O’Mahony 2023).

International issues:

Reneuron [Spain] may be confused with Remeron brand name for mirtazapine [US, Canada, and multiple international markets]

Sarafem [US, Puerto Rico] may be confused with Serophene brand name for clomiPHENE [multiple international markets]

Metabolism/Transport Effects

Substrate of CYP1A2 (Minor), CYP2B6 (Minor), CYP2C19 (Minor), CYP2C9 (Minor), CYP2D6 (Minor), CYP2E1 (Minor), CYP3A4 (Minor); Note: Assignment of Major/Minor substrate status based on clinically relevant drug interaction potential; Inhibits CYP2C19 (Moderate), CYP2D6 (Strong);

Drug Interactions

Note: Interacting drugs may not be individually listed below if they are part of a group interaction (eg, individual drugs within “CYP3A4 Inducers [Strong]” are NOT listed). For a complete list of drug interactions by individual drug name and detailed management recommendations, use the drug interactions program by clicking on the “Launch drug interactions program” link above.

Abciximab: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Abrocitinib: Agents with Antiplatelet Effects may increase antiplatelet effects of Abrocitinib. Risk X: Avoid

Acalabrutinib: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Agents with Blood Glucose Lowering Effects: Selective Serotonin Reuptake Inhibitor may increase hypoglycemic effects of Agents with Blood Glucose Lowering Effects. Risk C: Monitor

Ajmaline: CYP2D6 Inhibitors (Strong) may increase serum concentration of Ajmaline. Risk C: Monitor

Alcohol (Ethyl): May increase adverse/toxic effects of Selective Serotonin Reuptake Inhibitor. Specifically, the risk of psychomotor impairment may be enhanced. Management: Patients receiving selective serotonin reuptake inhibitors should be advised to avoid alcohol. Monitor for increased psychomotor impairment in patients who consume alcohol during treatment with selective serotonin reuptake inhibitors. Risk D: Consider Therapy Modification

Almotriptan: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Alosetron: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Amphetamines: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of Amphetamines. Management: Monitor for amphetamine toxicities, including serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability). Initiate amphetamines at lower doses, monitor frequently, and adjust dose as needed. Risk C: Monitor

Anagrelide: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Anticoagulants (Miscellaneous Agents): Antidepressants with Antiplatelet Effects may increase anticoagulant effects of Anticoagulants (Miscellaneous Agents). Risk C: Monitor

Antiemetics (5HT3 Antagonists): May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Antiplatelet Agents (P2Y12 Inhibitors): Agents with Antiplatelet Effects may increase antiplatelet effects of Antiplatelet Agents (P2Y12 Inhibitors). Risk C: Monitor

Antipsychotic Agents: Serotonergic Agents (High Risk) may increase adverse/toxic effects of Antipsychotic Agents. Specifically, serotonergic agents may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotic Agents may increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Risk C: Monitor

ARIPiprazole Lauroxil: CYP2D6 Inhibitors (Strong) may increase active metabolite exposure of ARIPiprazole Lauroxil. Management: Decrease aripiprazole lauroxil dose to next lower strength if used with strong CYP2D6 inhibitors for over 14 days. No dose adjustment needed if using the lowest dose (441 mg) or if a CYP2D6 PM. Max dose is 441 mg if also taking strong CYP3A4 inhibitors. Risk D: Consider Therapy Modification

ARIPiprazole: CYP2D6 Inhibitors (Strong) may increase serum concentration of ARIPiprazole. Management: Aripiprazole dose reductions or avoidance are required for indications other than major depressive disorder. Dose adjustments vary based on formulation, initial starting dose, and the additional use of CYP3A4 inhibitors. See interact monograph for details Risk D: Consider Therapy Modification

Aspirin: Selective Serotonin Reuptake Inhibitor may increase antiplatelet effects of Aspirin. Risk C: Monitor

Atomoxetine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Atomoxetine. Management: Initiate atomoxetine at a reduced dose (patients who weigh up to 70 kg: 0.5 mg/kg/day; adults or patients who weigh 70 kg or more: 40 mg/day) in patients receiving a strong CYP2D6 inhibitor. Increase to usual target dose after 4 weeks if needed. Risk D: Consider Therapy Modification

Belzutifan: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Belzutifan. Risk C: Monitor

Brexanolone: Selective Serotonin Reuptake Inhibitor may increase CNS depressant effects of Brexanolone. Risk C: Monitor

Brexpiprazole: CYP2D6 Inhibitors (Strong) may increase serum concentration of Brexpiprazole. Management: Reduce brexpiprazole dose to 50% of usual with strong CYP2D6 inhibitors, reduce to 25% of usual if used with both a strong CYP2D6 inhibitor and a strong or moderate CYP3A4 inhibitor; these recommendations do not apply if treating major depressive disorder Risk D: Consider Therapy Modification

Brivaracetam: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Brivaracetam. Risk C: Monitor

Bromopride: May increase adverse/toxic effects of Selective Serotonin Reuptake Inhibitor. Risk X: Avoid

Broom: CYP2D6 Inhibitors (Strong) may increase serum concentration of Broom. Specifically, the concentrations of sparteine, a constituent of broom, may be increased. Risk C: Monitor

BuPROPion: FLUoxetine may increase neuroexcitatory and/or seizure-potentiating effects of BuPROPion. BuPROPion may increase serum concentration of FLUoxetine. Risk C: Monitor

BusPIRone: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Caplacizumab: Agents with Antiplatelet Effects may increase adverse/toxic effects of Caplacizumab. Specifically, the risk of bleeding may be increased. Risk C: Monitor

CarBAMazepine: FLUoxetine may increase serum concentration of CarBAMazepine. Risk C: Monitor

Carisoprodol: CYP2C19 Inhibitors (Moderate) may decrease active metabolite exposure of Carisoprodol. CYP2C19 Inhibitors (Moderate) may increase serum concentration of Carisoprodol. Risk C: Monitor

Carvedilol: CYP2D6 Inhibitors (Strong) may increase serum concentration of Carvedilol. Risk C: Monitor

Charcoal, Activated: May decrease serum concentration of FLUoxetine. Charcoal, Activated may decrease active metabolite exposure of FLUoxetine. Risk C: Monitor

Chlorpheniramine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Chlorpheniramine. Risk C: Monitor

Cilostazol: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Cilostazol. CYP2C19 Inhibitors (Moderate) may increase active metabolite exposure of Cilostazol. Management: Reduce the cilostazol dose to 50 mg twice daily in patients who are also receiving moderate inhibitors of CYP2C19. Monitor clinical response to cilostazol closely. Risk D: Consider Therapy Modification

Cimetidine: May increase serum concentration of FLUoxetine. Risk C: Monitor

Citalopram: May increase serotonergic effects of FLUoxetine. This could result in serotonin syndrome. Citalopram may increase antiplatelet effects of FLUoxetine. FLUoxetine may increase serum concentration of Citalopram. Management: Limit citalopram dose to a maximum of 20 mg/day. Monitor for signs and symptoms of bleeding, QTc interval prolongation, or serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor) if combined. Risk D: Consider Therapy Modification

Clarithromycin: FLUoxetine may increase QTc-prolonging effects of Clarithromycin. Clarithromycin may increase serum concentration of FLUoxetine. Risk C: Monitor

CloBAZam: CYP2C19 Inhibitors (Moderate) may increase active metabolite exposure of CloBAZam. CYP2C19 Inhibitors (Moderate) may increase serum concentration of CloBAZam. Risk C: Monitor

Clopidogrel: CYP2C19 Inhibitors (Moderate) may decrease active metabolite exposure of Clopidogrel. Risk C: Monitor

CloZAPine: CYP2D6 Inhibitors (Strong) may increase serum concentration of CloZAPine. Risk C: Monitor

Collagenase (Systemic): Agents with Antiplatelet Effects may increase adverse/toxic effects of Collagenase (Systemic). Specifically, the risk of injection site bruising and or bleeding may be increased. Risk C: Monitor

Cyclobenzaprine: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

CYP2D6 Inhibitors (Strong): May increase serum concentration of FLUoxetine. Risk C: Monitor

Cyproheptadine: May decrease therapeutic effects of Selective Serotonin Reuptake Inhibitor. Risk C: Monitor

Dapoxetine: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Do not use serotonergic agents (high risk) with dapoxetine or within 7 days of serotonergic agent discontinuation. Do not use dapoxetine within 14 days of monoamine oxidase inhibitor use. Dapoxetine labeling lists this combination as contraindicated. Risk X: Avoid

Dasatinib: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Deoxycholic Acid: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Desmopressin: Hyponatremia-Associated Agents may increase hyponatremic effects of Desmopressin. Risk C: Monitor

Deutetrabenazine: CYP2D6 Inhibitors (Strong) may increase active metabolite exposure of Deutetrabenazine. Management: The total daily dose of deutetrabenazine should not exceed 36 mg with concurrent use of a strong CYP2D6 inhibitor. Risk D: Consider Therapy Modification

Dexlansoprazole: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Dexlansoprazole. Risk C: Monitor

Dexmethylphenidate-Methylphenidate: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Dextromethorphan: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of Dextromethorphan. Management: Consider alternatives to this drug combination. The dose of dextromethorphan/bupropion product should not exceed 1 tablet once daily. Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity. Risk D: Consider Therapy Modification

DiazePAM: CYP2C19 Inhibitors (Moderate) may increase serum concentration of DiazePAM. Risk C: Monitor

Digoxin: FLUoxetine may increase serum concentration of Digoxin. Risk C: Monitor

Direct Oral Anticoagulants (DOACs): Antidepressants with Antiplatelet Effects may increase anticoagulant effects of Direct Oral Anticoagulants (DOACs). Risk C: Monitor

DOXOrubicin (Conventional): CYP2D6 Inhibitors (Strong) may increase serum concentration of DOXOrubicin (Conventional). Risk X: Avoid

DULoxetine: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. DULoxetine may increase antiplatelet effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of DULoxetine. Management: Monitor for increased duloxetine effects/toxicities and signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperthermia, tremor, mental status changes) when these agents are combined. In addition, monitor for signs and symptoms of bleeding. Risk C: Monitor

Eletriptan: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Eliglustat: CYP2D6 Inhibitors (Strong) may increase serum concentration of Eliglustat. Management: Eliglustat dose is 84 mg daily with CYP2D6 inhibitors. Use is contraindicated (COI) when also combined with strong CYP3A4 inhibitors. When also combined with a moderate CYP3A4 inhibitor, use is COI in CYP2D6 EMs or IMs and should be avoided in CYP2D6 PMs. Risk D: Consider Therapy Modification

Epinephrine (Racemic): Selective Serotonin Reuptake Inhibitor may increase adverse/toxic effects of Epinephrine (Racemic). Risk X: Avoid

Ergot Derivatives: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Etravirine: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Etravirine. Risk C: Monitor

Fenfluramine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Fenfluramine. Management: Limit fenfluramine dose to 20 mg/day without concurrent stiripentol or to 17 mg/day with concomitant stiripentol and clobazam when used with a strong CYP2D6 inhibitor. Risk D: Consider Therapy Modification

Fesoterodine: CYP2D6 Inhibitors (Strong) may increase active metabolite exposure of Fesoterodine. Risk C: Monitor

Flecainide: CYP2D6 Inhibitors (Strong) may increase serum concentration of Flecainide. Risk C: Monitor

Flibanserin: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Flibanserin. Risk C: Monitor

FluPHENAZine: CYP2D6 Inhibitors (Strong) may increase serum concentration of FluPHENAZine. Risk C: Monitor

Fondaparinux: Antidepressants with Antiplatelet Effects may increase anticoagulant effects of Fondaparinux. Risk C: Monitor

Fosphenytoin-Phenytoin: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Fosphenytoin-Phenytoin. Risk C: Monitor

Gefitinib: CYP2D6 Inhibitors (Strong) may increase serum concentration of Gefitinib. Risk C: Monitor

Gepirone: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Risk C: Monitor

Gilteritinib: May decrease therapeutic effects of Selective Serotonin Reuptake Inhibitor. Management: Avoid use of this combination if possible. If the combination cannot be avoided, monitor closely for evidence of reduced response to the selective serotonin reuptake inhibitor. Risk D: Consider Therapy Modification

Glycoprotein IIb/IIIa Inhibitors: Agents with Antiplatelet Effects may increase antiplatelet effects of Glycoprotein IIb/IIIa Inhibitors. Risk C: Monitor

Haloperidol: CYP2D6 Inhibitors (Strong) may increase serum concentration of Haloperidol. Risk C: Monitor

Haloperidol: QT-prolonging Agents (Indeterminate Risk - Avoid) may increase QTc-prolonging effects of Haloperidol. Risk C: Monitor

Heparin: Antidepressants with Antiplatelet Effects may increase anticoagulant effects of Heparin. Risk C: Monitor

Heparins (Low Molecular Weight): Antidepressants with Antiplatelet Effects may increase anticoagulant effects of Heparins (Low Molecular Weight). Risk C: Monitor

Herbal Products with Anticoagulant/Antiplatelet Effects: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Iboga: CYP2D6 Inhibitors (Strong) may increase serum concentration of Iboga. Risk C: Monitor

Ibritumomab Tiuxetan: Agents with Antiplatelet Effects may increase antiplatelet effects of Ibritumomab Tiuxetan. Risk C: Monitor

Ibrutinib: Agents with Antiplatelet Effects may increase adverse/toxic effects of Ibrutinib. Specifically, the risk of bleeding and hemorrhage may be increased. Risk C: Monitor

Iloperidone: CYP2D6 Inhibitors (Strong) may increase serum concentration of Iloperidone. CYP2D6 Inhibitors (Strong) may increase active metabolite exposure of Iloperidone. Specifically, concentrations of the metabolite P88 may be increased. CYP2D6 Inhibitors (Strong) may decrease active metabolite exposure of Iloperidone. Specifically, concentrations of the metabolite P95 may be decreased. Management: Reduce iloperidone dose by half when administered with a strong CYP2D6 inhibitor and monitor for increased iloperidone toxicities, including QTc interval prolongation and arrhythmias. Risk D: Consider Therapy Modification

Indoramin: CYP2D6 Inhibitors (Strong) may increase serum concentration of Indoramin. Risk C: Monitor

Inotersen: Agents with Antiplatelet Effects may increase adverse/toxic effects of Inotersen. Specifically, the risk of bleeding may be increased. Risk C: Monitor

Ioflupane I 123: Coadministration of Selective Serotonin Reuptake Inhibitor and Ioflupane I 123 may alter diagnostic results. Risk C: Monitor

Lansoprazole: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Lansoprazole. Risk C: Monitor

Lasmiditan: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Levoketoconazole: QT-prolonging Agents (Indeterminate Risk - Avoid) may increase QTc-prolonging effects of Levoketoconazole. Management: Monitor for QTc interval prolongation and ventricular arrhythmias when these agents are combined. Patients with additional risk factors for QTc prolongation may be at even higher risk. Risk C: Monitor

Levomethadone: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Limaprost: May increase adverse/toxic effects of Agents with Antiplatelet Effects. Specifically, the risk of bleeding may be increased. Risk C: Monitor

Linezolid: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitor. This could result in serotonin syndrome. Risk X: Avoid

Lofexidine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Lofexidine. Risk C: Monitor

Lomitapide: FLUoxetine may increase serum concentration of Lomitapide. Management: Patients taking lomitapide 10 mg/day or more should decrease the lomitapide dose by half with concurrent fluoxetine; the lomitapide dose may then be increased to a max adult dose of 30 mg/day (patients on lomitapide 5 mg/day may continue that dose). Risk D: Consider Therapy Modification

Maprotiline: CYP2D6 Inhibitors (Strong) may increase serum concentration of Maprotiline. Risk C: Monitor

Mavacamten: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Mavacamten. Management: For patients on stable therapy with a moderate CYP2C19 inhibitor initiate mavacamten at 2.5 mg daily. For patients initiating a moderate CYP2C19 inhibitor during mavacamten therapy, dose reductions are recommended. See full mono for details. Risk D: Consider Therapy Modification

Melperone: FLUoxetine may increase serum concentration of Melperone. Risk X: Avoid

Mequitazine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Mequitazine. Risk X: Avoid

Metaxalone: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Metergoline: May decrease therapeutic effects of FLUoxetine. Risk C: Monitor

Methadone: CYP2D6 Inhibitors (Strong) may increase serum concentration of Methadone. Risk C: Monitor

Methadone: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Methylene Blue: Selective Serotonin Reuptake Inhibitor may increase serotonergic effects of Methylene Blue. This could result in serotonin syndrome. Risk X: Avoid

Metoclopramide: CYP2D6 Inhibitors (Strong) may increase serum concentration of Metoclopramide. Management: For gastroparesis: reduce metoclopramide dose to 5mg 4 times/day and limit to 20mg/day; nasal spray not recommended. For GERD: reduce metoclopramide dose to 5mg 4 times/day or to 10mg 3 times/day and limit to 30mg/day. Monitor for toxicity when combined. Risk D: Consider Therapy Modification

Metoprolol: CYP2D6 Inhibitors (Strong) may increase serum concentration of Metoprolol. Risk C: Monitor

Mexiletine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Mexiletine. Risk C: Monitor

Miscellaneous Antiplatelets: Agents with Antiplatelet Effects may increase antiplatelet effects of Miscellaneous Antiplatelets. Risk C: Monitor

Mivacurium: Selective Serotonin Reuptake Inhibitor may increase serum concentration of Mivacurium. Risk C: Monitor

Monoamine Oxidase Inhibitors (Antidepressant): Selective Serotonin Reuptake Inhibitor may increase serotonergic effects of Monoamine Oxidase Inhibitors (Antidepressant). This could result in serotonin syndrome. Risk X: Avoid

Nebivolol: CYP2D6 Inhibitors (Strong) may increase serum concentration of Nebivolol. Risk C: Monitor

Nefazodone: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitor. This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Nicergoline: CYP2D6 Inhibitors (Strong) may increase active metabolite exposure of Nicergoline. Specifically, concentrations of the MMDL metabolite may be increased. CYP2D6 Inhibitors (Strong) may decrease active metabolite exposure of Nicergoline. Specifically, concentrations of the MDL metabolite may be decreased. Risk C: Monitor

NIFEdipine: FLUoxetine may increase serum concentration of NIFEdipine. Risk C: Monitor

NiMODipine: FLUoxetine may increase serum concentration of NiMODipine. Risk C: Monitor

Nonsteroidal Anti-Inflammatory Agents (COX-2 Selective): Selective Serotonin Reuptake Inhibitor may increase antiplatelet effects of Nonsteroidal Anti-Inflammatory Agents (COX-2 Selective). Nonsteroidal Anti-Inflammatory Agents (COX-2 Selective) may decrease therapeutic effects of Selective Serotonin Reuptake Inhibitor. Risk C: Monitor

Nonsteroidal Anti-Inflammatory Agents (Nonselective): Selective Serotonin Reuptake Inhibitor may increase antiplatelet effects of Nonsteroidal Anti-Inflammatory Agents (Nonselective). Nonsteroidal Anti-Inflammatory Agents (Nonselective) may decrease therapeutic effects of Selective Serotonin Reuptake Inhibitor. Management: Consider alternatives to NSAIDs. Monitor for evidence of bleeding and diminished antidepressant effects. It is unclear whether COX-2-selective NSAIDs reduce risk. Risk D: Consider Therapy Modification

Nonsteroidal Anti-Inflammatory Agents (Topical): May increase antiplatelet effects of Selective Serotonin Reuptake Inhibitor. Risk C: Monitor

Obinutuzumab: Agents with Antiplatelet Effects may increase adverse/toxic effects of Obinutuzumab. Specifically, the risk of bleeding may be increased. Management: Consider avoiding coadministration of obinutuzumab and agents with antiplatelet effects, especially during the first cycle of obinutuzumab therapy. Risk D: Consider Therapy Modification

Oliceridine: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of Oliceridine. Management: Monitor for increased opioid effects (eg, respiratory depression, sedation) and for serotonin syndrome/serotonin toxicity when these agents are combined. Risk C: Monitor

Olmutinib: CYP2D6 Inhibitors (Strong) may increase serum concentration of Olmutinib. Risk C: Monitor

Omeprazole: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Omeprazole. Risk C: Monitor

Ondansetron: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Opioid Agonists (metabolized by CYP3A4 and CYP2D6): May increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may decrease therapeutic effects of Opioid Agonists (metabolized by CYP3A4 and CYP2D6). Management: Monitor for decreased therapeutic response (eg, analgesia) and opioid withdrawal when coadministered with SSRIs that strongly inhibit CYP2D6. Additionally, monitor for serotonin syndrome/serotonin toxicity if these drugs are combined. Risk C: Monitor

Opioid Agonists (metabolized by CYP3A4): May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Opioid Agonists: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Opipramol: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of Opipramol. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) and increased opipramol adverse effects when these agents are combined. Risk C: Monitor

Oxitriptan: Serotonergic Agents (High Risk) may increase serotonergic effects of Oxitriptan. This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

OxyCODONE: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of OxyCODONE. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may decrease active metabolite exposure of OxyCODONE. Specifically, oxymorphone concentrations may be reduced. Risk C: Monitor

PARoxetine: FLUoxetine may increase serotonergic effects of PARoxetine. This could result in serotonin syndrome. FLUoxetine may increase antiplatelet effects of PARoxetine. FLUoxetine may increase serum concentration of PARoxetine. PARoxetine may increase serum concentration of FLUoxetine. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, mental status changes), bleeding, and increased SSRI toxicities when these agents are combined. Risk C: Monitor

Pentosan Polysulfate Sodium: Agents with Antiplatelet Effects may increase adverse/toxic effects of Pentosan Polysulfate Sodium. Specifically, the risk of hemorrhage may be increased. Risk C: Monitor

Perhexiline: CYP2D6 Inhibitors (Strong) may increase serum concentration of Perhexiline. Risk C: Monitor

Perphenazine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Perphenazine. Risk C: Monitor

PHENobarbital: CYP2C19 Inhibitors (Moderate) may increase serum concentration of PHENobarbital. Risk C: Monitor

Pimozide: CYP2D6 Inhibitors (Strong) may increase serum concentration of Pimozide. Risk X: Avoid

Pirtobrutinib: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Pitolisant: CYP2D6 Inhibitors (Strong) may increase serum concentration of Pitolisant. Management: Reduce the pitolisant dose by 50% if a strong CYP2D6 inhibitor is initiated. For patients already receiving strong CYP2D6 inhibitors, initial doses of pitolisant should be reduced and depends on age and patient weight. See full monograph for details. Risk D: Consider Therapy Modification

Primaquine: CYP2D6 Inhibitors (Strong) may decrease therapeutic effects of Primaquine. CYP2D6 Inhibitors (Strong) may decrease active metabolite exposure of Primaquine. Management: Consider alternatives to the combination of primaquine and strong CYP2D6 inhibitors. If concomitant use is necessary, monitor for signs and symptoms of possible primaquine treatment failure. Risk D: Consider Therapy Modification

Primidone: CYP2C19 Inhibitors (Moderate) may increase active metabolite exposure of Primidone. Specifically, concentrations of phenobarbital may be increased. Risk C: Monitor

Proguanil: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Proguanil. CYP2C19 Inhibitors (Moderate) may decrease active metabolite exposure of Proguanil. Risk C: Monitor

Propafenone: CYP2D6 Inhibitors (Strong) may increase serum concentration of Propafenone. Risk C: Monitor

Propranolol: CYP2D6 Inhibitors (Strong) may increase serum concentration of Propranolol. Risk C: Monitor

Psilocybin: Antidepressants may decrease therapeutic effects of Psilocybin. Risk C: Monitor

QT-prolonging Agents (Highest Risk): QT-prolonging Agents (Indeterminate Risk - Avoid) may increase QTc-prolonging effects of QT-prolonging Agents (Highest Risk). Management: Monitor for QTc interval prolongation and ventricular arrhythmias when these agents are combined. Patients with additional risk factors for QTc prolongation may be at even higher risk. Risk C: Monitor

Ramosetron: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Rasagiline: Selective Serotonin Reuptake Inhibitor may increase serotonergic effects of Rasagiline. This could result in serotonin syndrome. Risk X: Avoid

RisperiDONE: CYP2D6 Inhibitors (Strong) may increase serum concentration of RisperiDONE. Management: Careful monitoring for risperidone toxicities and possible dose adjustment are recommended when combined with strong CYP2D6 inhibitors. See full interaction monograph for details. Risk D: Consider Therapy Modification

Safinamide: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitor. This could result in serotonin syndrome. Risk X: Avoid

Selective Serotonin Reuptake Inhibitor: May increase serotonergic effects of Selective Serotonin Reuptake Inhibitor. This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitor may increase antiplatelet effects of Selective Serotonin Reuptake Inhibitor. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, mental status changes) when these agents are combined. In addition, monitor for signs and symptoms of bleeding. Risk C: Monitor

Selegiline: Selective Serotonin Reuptake Inhibitor may increase serotonergic effects of Selegiline. This could result in serotonin syndrome. Risk X: Avoid

Selumetinib: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Serotonergic Agents (High Risk, Miscellaneous): May increase serotonergic effects of Selective Serotonin Reuptake Inhibitor. This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Serotonergic Non-Opioid CNS Depressants: Selective Serotonin Reuptake Inhibitor may increase serotonergic effects of Serotonergic Non-Opioid CNS Depressants. This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Serotonergic Opioids (High Risk): May increase serotonergic effects of Selective Serotonin Reuptake Inhibitor. This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) if these agents are combined. Risk C: Monitor

Serotonin 5-HT1D Receptor Agonists (Triptans): May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Serotonin/Norepinephrine Reuptake Inhibitor: Selective Serotonin Reuptake Inhibitor may increase serotonergic effects of Serotonin/Norepinephrine Reuptake Inhibitor. This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitor may increase antiplatelet effects of Serotonin/Norepinephrine Reuptake Inhibitor. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, mental status changes) when these agents are combined. In addition, monitor for signs and symptoms of bleeding. Risk C: Monitor

Sertindole: CYP2D6 Inhibitors (Strong) may increase serum concentration of Sertindole. Management: Consider alternatives to this combination when possible. If combined, consider using lower doses of sertindole and monitor the ECG closely for evidence of QTc interval prolongation. Risk D: Consider Therapy Modification

Sofpironium: CYP2D6 Inhibitors (Strong) may increase serum concentration of Sofpironium. Risk X: Avoid

St John's Wort: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. St John's Wort may decrease serum concentration of Serotonergic Agents (High Risk). Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Syrian Rue: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) when these agents are combined. Risk C: Monitor

Tamoxifen: CYP2D6 Inhibitors (Strong) may decrease active metabolite exposure of Tamoxifen. Specifically, strong CYP2D6 inhibitors may decrease the metabolic formation of highly potent active metabolites. Management: Avoid concurrent use of strong CYP2D6 inhibitors with tamoxifen when possible, as the combination may be associated with a reduced clinical effectiveness of tamoxifen. Risk D: Consider Therapy Modification

Tamsulosin: CYP2D6 Inhibitors (Strong) may increase serum concentration of Tamsulosin. Risk C: Monitor

Tetrabenazine: CYP2D6 Inhibitors (Strong) may increase active metabolite exposure of Tetrabenazine. Specifically, concentrations of the active alpha- and beta-dihydrotetrabenazine metabolites may be increased. Management: Limit the tetrabenazine dose to 50 mg per day (25 mg per single dose) in patients taking strong CYP2D6 inhibitors. Risk D: Consider Therapy Modification

Thiazide and Thiazide-Like Diuretics: Selective Serotonin Reuptake Inhibitor may increase hyponatremic effects of Thiazide and Thiazide-Like Diuretics. Risk C: Monitor

Thioridazine: FLUoxetine may increase serum concentration of Thioridazine. Risk X: Avoid

Thrombolytic Agents: Agents with Antiplatelet Effects may increase adverse/toxic effects of Thrombolytic Agents. Specifically, the risk of bleeding may be increased. Risk C: Monitor

Thyroid Products: Selective Serotonin Reuptake Inhibitor may decrease therapeutic effects of Thyroid Products. Thyroid product dose requirements may be increased. Risk C: Monitor

Tilidine: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Tilidine. CYP2C19 Inhibitors (Moderate) may increase active metabolite exposure of Tilidine. Risk C: Monitor

Timolol (Ophthalmic): CYP2D6 Inhibitors (Strong) may increase serum concentration of Timolol (Ophthalmic). Risk C: Monitor

Timolol (Systemic): CYP2D6 Inhibitors (Strong) may increase serum concentration of Timolol (Systemic). Risk C: Monitor

Tipranavir: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Tolterodine: CYP2D6 Inhibitors (Strong) may increase serum concentration of Tolterodine. Risk C: Monitor

TraMADol: Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase adverse/toxic effects of TraMADol. Specifically, the risk for serotonin syndrome/serotonin toxicity and seizures may be increased. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may decrease therapeutic effects of TraMADol. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes), seizures, and decreased tramadol efficacy when these agents are combined. Risk C: Monitor

Tricyclic Antidepressants: FLUoxetine may increase serotonergic effects of Tricyclic Antidepressants. FLUoxetine may increase serum concentration of Tricyclic Antidepressants. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, autonomic instability, mental status changes) and increased TCA concentrations/effects if these agents are combined. Risk D: Consider Therapy Modification

Valbenazine: CYP2D6 Inhibitors (Strong) may increase active metabolite exposure of Valbenazine. Management: Reduce valbenazine dose to 40 mg once daily when combined with a strong CYP2D6 inhibitor. Monitor for increased valbenazine effects/toxicities. Risk D: Consider Therapy Modification

Vasopressin: Drugs Suspected of Causing SIADH may increase therapeutic effects of Vasopressin. Specifically, the pressor and antidiuretic effects of vasopressin may be increased. Risk C: Monitor

Venlafaxine: May increase antiplatelet effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). Venlafaxine may increase serotonergic effects of Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors). This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may decrease active metabolite exposure of Venlafaxine. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of Venlafaxine. Management: Monitor for signs and symptoms of serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, hyperthermia, diaphoresis, tremor, mental status changes) when these agents are combined. In addition, monitor for signs and symptoms of bleeding. Risk C: Monitor

Vitamin E (Systemic): May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Vitamin K Antagonists: Antidepressants with Antiplatelet Effects may increase anticoagulant effects of Vitamin K Antagonists. Risk C: Monitor

Volanesorsen: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Voriconazole: CYP2C19 Inhibitors (Moderate) may increase serum concentration of Voriconazole. Risk C: Monitor

Vortioxetine: Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serotonergic effects of Vortioxetine. This could result in serotonin syndrome. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase antiplatelet effects of Vortioxetine. Selective Serotonin Reuptake Inhibitors (Strong CYP2D6 Inhibitors) may increase serum concentration of Vortioxetine. Management: Consider alternatives to this drug combination. If combined, reduce the vortioxetine dose by half and monitor for signs and symptoms of bleeding and serotonin syndrome/serotonin toxicity (eg, hyperreflexia, clonus, autonomic instability). Risk D: Consider Therapy Modification

Xanomeline: CYP2D6 Inhibitors (Strong) may increase serum concentration of Xanomeline. Risk C: Monitor

Zanubrutinib: May increase antiplatelet effects of Agents with Antiplatelet Effects. Risk C: Monitor

Ziprasidone: May increase serotonergic effects of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Risk C: Monitor

Zuclopenthixol: CYP2D6 Inhibitors (Strong) may increase serum concentration of Zuclopenthixol. Risk C: Monitor

Reproductive Considerations

Evaluate pregnancy status prior to initiating treatment in patients who could become pregnant. Treatment should not be withheld, but pharmacologic management may vary based on reproductive status, severity of illness, and history of antidepressant response (ACOG 2023; WFSBP [Dodd 2018]). When treating depression, anxiety, obsessive-compulsive disorder, or post-traumatic stress disorder, selective serotonin reuptake inhibitors (SSRIs) are preferred for use prior to conception in patients who are treatment naive or who do not have a history of effective treatment. Patients effectively treated may continue their current medication when planning a pregnancy unless contraindications exist (BAP [McAllister-Williams 2017]). Management of mental health conditions in patients who could become pregnant should be based on a shared decision-making process that considers the possibility of pregnancy during treatment (ACOG 2023; BAP [McAllister-Williams 2017]; CANMAT [MacQueen 2016]).

Fluoxetine is also used for the treatment of premenstrual dysphoric disorder. Symptom-onset dosing, which is initiated on the day of symptom onset and continued until after the start of menses, may be beneficial in patients attempting to conceive (Lanza di Scalea 2019).

SSRI use may cause hyperprolactinemia and rarely changes in thyroid function, both of which can be associated with menstrual irregularities. Depression is also associated with menstrual changes (Padda 2021).

Some studies suggest SSRIs may impair semen parameters, including the motility of spermatozoa; use of other treatments may be preferred in male patients planning a pregnancy (ISSM [Althof 2014], Sylvester 2019). SSRIs are associated with an increased risk of sexual dysfunction (Tarchi 2023). Fluoxetine may delay ejaculation and is used off label for the treatment of premature ejaculation (ISSM [Althof 2014]; Sathianathen 2021).

Pregnancy Considerations

Fluoxetine and its metabolite cross the placenta.

As a class, selective serotonin reuptake inhibitors (SSRIs) have been evaluated extensively in pregnant patients. Studies focusing on newborn outcomes following first trimester exposure often have inconsistent results. Overall, an increased risk of major congenital malformations has not been observed with fluoxetine when considering differences in study design and confounders such as maternal disease and social factors. An increased risk of adverse cardiovascular malformations following in utero exposure to fluoxetine has been observed in some studies; however, a causal relationship has not been established (ACOG 2023; Anderson 2020; BAP [McAllister-Williams 2017]; Biffi 2020; Fitton 2020; Gao 2018; Lebin 2022).

Adverse effects in the newborn following SSRI exposure in the third trimester include neonatal adaptation syndrome and persistent pulmonary hypertension of the newborn. Neonatal adaptation syndrome can occur shortly after birth and typically resolves within 2 weeks. Mechanisms of neonatal adaptation syndrome are not well understood but may be due to either SSRI toxicity or withdrawal. Reducing the dose or discontinuing the SSRI prior to delivery to reduce the risk of neonatal adaptation syndrome is not recommended (ACOG 2023). Symptoms can include apnea, constant crying, cyanosis, feeding difficulty, hyperreflexia, hypo- or hypertonia, hypoglycemia, irritability, jitteriness, respiratory distress, seizures, temperature instability, tremor, and vomiting. Prolonged hospitalization, respiratory support, or tube feedings may be required.

Persistent pulmonary hypertension of the newborn is a rare complication of SSRI use during pregnancy with symptoms of respiratory distress within the first hours of life and an increased risk of neonatal mortality (ACOG 2023). Monitoring of infants exposed to SSRIs late in pregnancy is recommended (Masarwa 2019; Ng 2019). Data related to the long-term effects of in utero SSRI exposure on infant neurodevelopment and behavior are limited (CANMAT [MacQueen 2016]; Lebin 2022).

SSRIs may increase the risk of bleeding. Exposure late in pregnancy is associated with less than a 2-fold increase in postpartum hemorrhage. The clinical significance of this is uncertain (BAP [McAllister-Williams 2017]; Lebin 2022).

Due to pregnancy-induced physiologic changes, some pharmacokinetic parameters of fluoxetine may be altered (Yue 2023). Close clinical monitoring as pregnancy progresses and therapeutic drug monitoring to detect patterns of changing plasma concentrations is recommended to assist dose adjustment when needed (Schoretsanitis 2020; Yue 2023).

Untreated and undertreated mental health conditions are associated with adverse pregnancy outcomes. Untreated or undertreated depression is associated with preterm birth, low birth weight (LBW), preeclampsia, postpartum depression, and impaired infant attachment (associated with long-term developmental effects). Anxiety disorders during pregnancy are associated with LBW, preterm birth, and adverse behavioral outcomes in the offspring. Discontinuing effective medications during pregnancy increases the risk of relapse (ACOG 2023). Management should be made as part of a shared decision-making process (ACOG 2023).

SSRIs are preferred for use in pregnant patients who are treatment naive or who do not have a history of effective treatment with another medication. Fluoxetine is not a first-line medication for pregnant patients with no prior medication history (ACOG 2023). SSRI dosing should be initiated with half the lowest recommended dose and titrated gradually over 4 to 10 days. Dose adjustments may be required as pregnancy progresses to keep symptoms in remission (ACOG 2023).

When medications are used, the lowest effective dose of a single agent is recommended. Optimize dosing prior to changing a medication or adding additional agents whenever possible. Monthly monitoring for symptom improvement with a validated screening tool during pregnancy is recommended. Manage side effects as needed (ACOG 2023).

Data collection to monitor pregnancy and infant outcomes following exposure to antidepressant medications is ongoing. Pregnant patients ≤45 years of age with a history of psychiatric illness are encouraged to enroll in the National Pregnancy Registry for Antidepressants (1-866-961-2388 or https://womensmentalhealth.org/research/pregnancyregistry/antidepressants).

Breastfeeding Considerations

Fluoxetine and its active metabolite (norfluoxetine) are present in breast milk.

Multiple reports summarize data related to the presence of fluoxetine in breast milk:

• A review article used pooled data from 149 mother/infant pairs to calculate the estimated daily infant dose of fluoxetine via breast milk to be 0.14 mg/day providing a relative infant dose (RID) of <12%. The maternal dose and actual breast milk concentrations for the calculation were not provided. Infant plasma concentrations were up to 80% of those in the maternal plasma (Berle 2011).

• A second review article included information from 280 cases; maternal daily doses of fluoxetine were 10 to 80 mg/day. Using data taken from one study in the review, the highest breast milk concentrations of fluoxetine were 17 to 293 ng/mL following maternal doses of 20 to 40 mg/day from 11 women 2 to 23 weeks postpartum, providing a RID of 6.5%; norfluoxetine was also present in breast milk. The highest breast milk concentration of fluoxetine reported in the review was 578 ng/mL in 1 patient following a dose of 20 mg. Fluoxetine and norfluoxetine were detected in the serum of some infants (Orsolini 2015).

• A study published since these reviews reports a fluoxetine RID of 20%, following a maternal dose of 20 mg/day taken by one woman throughout pregnancy and continuing postpartum; sampling occurred within 7 days after delivery (fluoxetine concentrations 323.3 ng/mL [breast milk]; 216.8 ng/mL [maternal serum]) (Pogliani 2019).

• Concentrations of norfluoxetine in breast milk should also be considered. In a study of 19 women (20 infants), maternal and infant serum samples were obtained 5 to 34 weeks after delivery following maternal use of fluoxetine 10 to 60 mg/day. Fluoxetine was present in 30% of infant serum samples (range: <1 to 84 ng/mL) and norfluoxetine was present in 85% (range: <1 to 265 ng/mL). Breast milk was sampled in 9 cases. Peak breast milk concentrations of fluoxetine and norfluoxetine occurred 8 hours after the maternal dose and correlated highly with infant serum concentrations for norfluoxetine. The highest milk concentration of fluoxetine in this study was 235 ng/mL and the same mother also had the highest norfluoxetine milk concentration (222 ng/mL). These concentrations were obtained following a maternal dose of 40 mg/day. Women with serum concentrations of fluoxetine plus norfluoxetine <150 ng/mL had infants with low (<5 ng/mL) to nondetectable serum concentrations (Hendrick 2001).

• Based on a pooled analysis of data, infants exposed to fluoxetine via breast milk are more likely to have elevated plasma concentrations in comparison to those exposed to other selective serotonin reuptake inhibitors (SSRIs) (Weissman 2004).

• In general, breastfeeding is considered acceptable when the RID is <10% (Anderson 2016; Ito 2000); however, some sources note breastfeeding should only be considered if the RID is <5% for psychotropic agents (Anderson 2021). When an RID is >25%, breastfeeding should generally be avoided (Anderson 2016; Ito 2000). Additional considerations can include the gestational and postnatal age of the infant, the actual amount of milk being ingested (less in the first couple days of life and when weaning), properties of the specific maternal medication, medical conditions of the infant, and medications the infant is receiving therapeutically.

Adverse events following exposure to SSRIs via breast milk have been reported in some infants (Lanza di Scalea 2009; Orsolini 2015). Adverse events reported following maternal use of fluoxetine include agitation, irritability, poor feeding, and poor weight gain; crying, sleep disturbance, vomiting, and watery stools have also been reported (Kristensen 1999; Lester 1993). Infants exposed to an SSRI via breast milk should be monitored for irritability and changes in sleep, feeding patterns, and behavior, as well as growth and development (ABM [Sriraman 2015]; BAP [McAllister-Williams 2017]; Weissman 2004).

Maternal use of an SSRI during pregnancy may delay lactogenesis (Marshall 2010); however, the underlying maternal illness and various other factors may also influence this outcome. Patients who wish to breastfeed during treatment with an SSRI may need additional assistance to initiate and maintain breastfeeding (Anderson 2021).

According to the manufacturer, the decision to breastfeed during fluoxetine therapy should consider the risk of infant exposure, the benefits of breastfeeding to the infant, and the benefits of treatment to the mother. Patients effectively treated for depression, anxiety, obsessive-compulsive disorder, or post-traumatic stress disorder during pregnancy may continue their medication postpartum unless contraindications to breastfeeding exist. The presence and concentration of the drug in breast milk, efficacy of maternal treatment, and infant age should be considered when initiating a medication for the first time postpartum. When first initiating an antidepressant in a patient who is treatment naïve and breastfeeding, agents other than fluoxetine are preferred (ABM [Sriraman 2015]; BAP [McAllister-Williams 2017]; CANMAT [MacQueen 2016]). Breastfeeding may be continued in patients treated with an SSRI during pregnancy (ABM [Sriraman 2015]; ACOG 2023). Treatment should not be withheld or discontinued based only on breastfeeding status (ACOG 2023).

Monitoring Parameters

Serum sodium in at-risk populations (as clinically indicated); blood glucose (for diabetic patients); liver and renal function (baseline and as clinically indicated); ECG assessment and periodic monitoring in patients with risk factors for QT prolongation and ventricular arrhythmia; closely monitor patients for depression, clinical worsening, suicidality, or unusual changes in behavior (eg, anxiety, agitation, panic attacks, insomnia, irritability, hostility, impulsivity, akathisia, hypomania, mania, social functioning), particularly during the initial 1 to 2 months of therapy or during periods of dosage adjustments (increases or decreases); akathisia; sleep status.

Reference Range

Therapeutic levels have not been well established.

Therapeutic: Fluoxetine plus norfluoxetine: 120 to 500 ng/mL (Hiemke 2018)

Laboratory alert level: Fluoxetine plus norfluoxetine: >1,000 ng/mL (Hiemke 2018)

Mechanism of Action

Inhibits CNS neuron serotonin reuptake; minimal or no effect on reuptake of norepinephrine or dopamine; does not significantly bind to alpha-adrenergic, histamine, or cholinergic receptors

Pharmacokinetics (Adult Data Unless Noted)

Onset of action:

Anxiety disorders (generalized anxiety, panic, obsessive-compulsive disorder, posttraumatic stress disorder): Initial effects may be observed within 2 weeks of treatment, with continued improvements through 4 to 6 weeks (Issari 2016; Varigonda 2016; WFSBP [Bandelow 2023a]); some experts suggest up to 12 weeks of treatment may be necessary for response, particularly in patients with obsessive-compulsive disorder and posttraumatic stress disorder (BAP [Baldwin 2014]; Katzman 2014; WFSBP [Bandelow 2023a]; WFSBP [Bandelow 2023b]).

Body dysmorphic disorder: Initial effects may be observed within 2 weeks; some experts suggest up to 12 to 16 weeks of treatment may be necessary for response in some patients (Phillips 2008).

Depression: Initial effects may be observed within 1 to 2 weeks of treatment, with continued improvements through 4 to 6 weeks (Papakostas 2006; Posternak 2005; Szegedi 2009; Taylor 2006).

Premenstrual dysphoric disorder: Initial effects may be observed within the first few days of treatment, with response at the first menstrual cycle of treatment (ISPMD [Nevatte 2013]).

Absorption: Well absorbed; delayed 1 to 2 hours with weekly formulation

Distribution: Vd: 12 to 43 L/kg

Protein binding: 95% to albumin and alpha1 glycoprotein

Metabolism: Hepatic, via CYP2C19 and 2D6, to norfluoxetine (activity equal to fluoxetine)

Half-life elimination: Adults:

Parent drug: 1 to 3 days (acute), 4 to 6 days (chronic), 7.6 days (cirrhosis)

Metabolite (norfluoxetine): 9.3 days (range: 4 to 16 days), 12 days (cirrhosis)

Time to peak, serum: 6 to 8 hours

Excretion: Urine (10% as norfluoxetine, 2.5% to 5% as fluoxetine)

Note: Weekly formulation results in greater fluctuations between peak and trough concentrations of fluoxetine and norfluoxetine compared to once-daily dosing (24% daily/164% weekly; 17% daily/43% weekly, respectively). Trough concentrations are 76% lower for fluoxetine and 47% lower for norfluoxetine than the concentrations maintained by 20 mg once-daily dosing. Steady-state fluoxetine concentrations are ~50% lower following the once-weekly regimen compared to 20 mg once daily. Average steady-state concentrations of once-daily dosing were highest in children ages 6 to <13 (fluoxetine 171 ng/mL; norfluoxetine 195 ng/mL), followed by adolescents ages 13 to <18 (fluoxetine 86 ng/mL; norfluoxetine 113 ng/mL); concentrations were considered to be within the ranges reported in adults (fluoxetine 91 to 302 ng/mL; norfluoxetine 72 to 258 ng/mL).

Pharmacokinetics: Additional Considerations (Adult Data Unless Noted)

Hepatic function impairment: The half-life for fluoxetine and norfluoxetine is prolonged. Elimination half-life increased from 2.2 days in controls to 6.6 days and clearance decreased by 50% following a single dose of fluoxetine in patients with stable alcoholic cirrhosis (Mullish 2014; Schenker 1988).

Pediatric: Average steady-state fluoxetine serum concentrations in children (n=10; 6 to <13 years of age) were 2-fold higher than in adolescents (n=11; 13 to <18 years of age); all patients received 20 mg/day; average steady-state norfluoxetine serum concentrations were 1.5-fold higher in the children compared with adolescents; differences in weight almost entirely explained the differences in serum concentrations.

Brand Names: International
International Brand Names by Country
For country code abbreviations (show table)

  • (AE) United Arab Emirates: Flozak | Fluneurin | Fluoxone | Fluran | Fluxetyl | Fluzyn | Prozac | Salipax;
  • (AR) Argentina: Alental | Animex on | Animex-on | Anzolden | Captaton | Eburnate | Equilibrane | Faboxetina | Falimus | Felixina | Fibrotina | Fiorot | Fluopiram | Fluoxetina Cevallos | Fluoxetina fabra | Fluoxetina northia | Fluoxetina teva | Fluoxiram | Foxetin | Lapsus | Mitilase | Nervosal | Neupax | Pridamos | Prozac | Saurat | Xetna;
  • (AT) Austria: Felicium | Floccin | Fluctine | Fluoxetin 1a pharma | Fluoxetin 1a pharma gmbh | Fluoxetin arcana | Fluoxetin G L | Fluoxetin genericon pharma | Fluoxibene | Flux | Fluxil | Fluxomed | Mutan | Positivum;
  • (AU) Australia: Apo fluoxetine | Auscap | Blooms the chemist fluoxetine | Btc fluoxetine | Cm fluoxetine | Dbl fluoxetine | Erocap | Fluohexal | Fluotex | Fluoxebell | Fluoxetine | Fluoxetine an | Fluoxetine apotex | Fluoxetine as | Fluoxetine ascent | Fluoxetine Ga | Fluoxetine Generichealth | Fluoxetine mlabs | Fluoxetine ps | Fluoxetine Rbx | Fluoxetine sandoz | Fluoxetine-bc | Fluoxetine-dp | Lovan | Noumed fluoxetine | Pharmacor fluoxetine | Prozac | Sbpa fluoxetine | Tw fluoxetine | Zactin;
  • (BD) Bangladesh: Depil | Modipran | Nodep | Nodepress | Prodep | Prolert | Prozac;
  • (BE) Belgium: Docfluoxetine | Fluox | Fluoxemed | Fluoxetine aurobindo | Fluoxetine eg | Fluoxetine eurogenerics | Fluoxetine merck-generics | Fluoxetine sandoz | Fluoxetine teva generics belgium | Fluoxetine Topgen | Fluoxetop | Fontex | Prosimed | Prozac;
  • (BF) Burkina Faso: Prozac;
  • (BG) Bulgaria: Biflox | Biozac | Deprexit | Fluoxetin | Fluval | Prozac | Ranflutin | Sofluxen;
  • (BR) Brazil: Cloridrato de fluoxetina | Daforin | Depoflox | Deprax | Depress | Detaque | Eufor | Fluox | Fluoxetin | Fluoxetina | Fluxene | Neo fluoxetin | Nortec | Prozac | Prozac durapac | Prozen | Psiquial | Verotina | Zyfloxin;
  • (CH) Switzerland: Fluctine | Fluocim | Fluox-basan | Fluoxetin actavis | Fluoxetin Axapharm | Fluoxetin Cimex | Fluoxetin helvepharm | Fluoxetin Helvepharma | Fluoxetin Sandoz | Fluoxetin sandoz eco | Fluoxetin spirig | Fluoxetin Streuli | Fluoxetin Teva | Fluoxetin zentiva | Fluoxetin-Dista | Fluoxetine Winthrop | Fluoxetine-mepha | Fluoxifar | Flusol | Prozac;
  • (CI) Côte d'Ivoire: Calmz | Fluoxetina | Fluoxetine Merinal;
  • (CL) Chile: Actan | Alentol | Anisimol | Clinium | Dominium | Fluoxetina | Fluseren | Pragmaten | Prozac | Sostac | Tremafarm | Ultiflox;
  • (CN) China: Ao mai lun | Apo fluoxetine | Fluoxetine | Ju li neng | Kai ke | Prozac | Yi wei zhi | You ke | Zactin;
  • (CO) Colombia: Ansidep | Ansilan | Cresptor | Deprexin | Fluopres | Fluoxetina | Fluoxetina mk | Flutin | Fluxene | Moltoben | Pragmaten | Pressetina | Prozac | Xetil | Xetinax | Zepax;
  • (CR) Costa Rica: Xetina raven;
  • (CZ) Czech Republic: Apo fluoxetine | Defluox | Deprenon | Deprex | Floxet | Flumirex | Fluoxetin | Fluoxetine aurobindo | Fluoxetine vitabalans | Fluoxetine-mepha | Fluoxin | Fluxonil | Fluzak | Magrilan | Portal | Prozac | Salipax;
  • (DE) Germany: Flucti-nerton | Fluctin | Fluctine | Fluneurin | Fluox | Fluox-puren | Fluoxa | Fluoxe-Q | Fluoxelich | Fluoxemerck | Fluoxetin | Fluoxetin 1a pharma | Fluoxetin actavis | Fluoxetin beta | Fluoxetin CT | Fluoxetin Dura | Fluoxetin ksk | Fluoxetin micro labs | Fluoxetin Ratiopharm | Fluoxetin rph | Fluoxetin Sandoz | Fluoxetin Stada | Fluoxetin Teva | Fluoxetin Vitabalans | Fluoxetin-biomo | Fluoxgamma | Fluxet | Fysionorm | Motivone | Prozac;
  • (DK) Denmark: Fluoxetin alpharma | Flutin | Folizol;
  • (DO) Dominican Republic: Actan | Cymaflox | Depress | Deprifel | Deturben | Equiflox | Flocefran | Fluoxetina | Fluoxetina mk | Fluoxil | Flutinax | Fluxadir | Fluxal | Foxetin | Hapilux | Moltoben | Neolzina | Prozac | Rowexetina | Siquial | Tiflum;
  • (EC) Ecuador: Actan | Aprinol | Dominium | Flouxac | Floxet | Fluoxac | Fluoxepharm | Fluoxet | Fluoxetina | Fluoxetina la sante | Fluoxetina mk | Fluoxetina nifa | Fluxiten | Luminal | Pragmaten | Proxetina | Prozac | Rowexetina | Salipax;
  • (EE) Estonia: Deprenon | Deprex | Deprimax | Fluoxetine | Fluoxetine vitabalans | Fluval | Flux | Framex | Magrilan | Nycoflox | Prozac | Salipax | Seronil;
  • (EG) Egypt: Alzac | Depezac | Depreban | Durazac | Elevamood | Fiesto | Florosin | Fluozac | Flutin | Fluxotine | Octozac | Philozac | Prozac;
  • (ES) Spain: Adofen | Astrin | Fluoxetina alacan | Fluoxetina almus | Fluoxetina alter | Fluoxetina apotex | Fluoxetina Aristo | Fluoxetina asol | Fluoxetina aurobindo | Fluoxetina aurovitas | Fluoxetina bayvit | Fluoxetina belmac | Fluoxetina bexal | Fluoxetina cinfa | Fluoxetina combino | Fluoxetina cuve | Fluoxetina davur | Fluoxetina Diasa | Fluoxetina edigen | Fluoxetina esteve | Fluoxetina ferrer | Fluoxetina grapa | Fluoxetina kern | Fluoxetina korhispana | Fluoxetina lareq | Fluoxetina lasa | Fluoxetina mabo | Fluoxetina merck | Fluoxetina normon | Fluoxetina ranbaxy | Fluoxetina rimafar | Fluoxetina rubio | Fluoxetina sandoz | Fluoxetina Tarbis | Fluoxetina vir | Lecimar | Luramon | Nodepe | Prozac | Reneuron;
  • (ET) Ethiopia: Fluoxetine;
  • (FI) Finland: Fluoksetiini ennapharma | Fluoxal | Fluoxetin generics | Fluoxetin Sandoz | Fluoxetine ranbaxy | Fluoxetine stada | Fluoxetinevitabalans | Fluxantin | Fontex | Seromex | Seronil;
  • (FR) France: Fluoxetine | Fluoxetine almus | Fluoxetine Alter | Fluoxetine arrow | Fluoxetine biogaran | Fluoxetine Bouchara Recordati | Fluoxetine cristers | Fluoxetine evolugen | Fluoxetine g gam | Fluoxetine GNR | Fluoxetine Intas | Fluoxetine irex | Fluoxetine Isomed | Fluoxetine ivax | Fluoxetine merck | Fluoxetine phr | Fluoxetine Qualimed | Fluoxetine ranbaxy | Fluoxetine ratiopharm | Fluoxetine rpg | Fluoxetine teva | Fluoxetine zydus | Prozac;
  • (GB) United Kingdom: Felicium | Fluoxetine | Fluoxetine almus | Fluoxetine arrow | Fluoxetine cox | Fluoxetine kent | Fluoxetine sandoz | Oxactin | Prozac | Prozep | Prozit | Ranflutin;
  • (GR) Greece: Dagrilan | Dinalexin | Exostrept | Flonital | Fluoxetine | Fluoxetine/mylan | Fluxadir | Fokeston | Hapilux | Ladose | Orthon | Sartuzin | Sofelin | Stephadilat S | Stressless | Thiramil | Zinovat;
  • (HK) Hong Kong: Altazac | Apo fluoxetine | Cp-Fluoxet | Dawnex | Deprexin | Flunil | Fluoxetine | Fluxetin | Fluxil | Magrilan | Nopres | Pms fluoxetine | Prozac | Qualisac | Sartuzin;
  • (HR) Croatia: Fluval | Portal | Prozac;
  • (HU) Hungary: Apo fluoxetin | Deprexin | Fefluzin | Floxet | Fluoxetine vitabalans | Huma-fluoxetin | Portal | Praxin | Prozac;
  • (ID) Indonesia: Andep | Ansi | Antiprestin | Courage | Deprezac | Deproz | Elizac | Fluoxetine HCL | Foransi | Kalxetin | Lodep | Nopres | Noxetine | Oxipres | Prozac | Zac;
  • (IE) Ireland: Affex | Bellzac | Biozac | Fluoxetine | Fluzac | Gerozac | Norzac | Prozac | Prozamel | Prozatan | Prozit;
  • (IL) Israel: Affectine | Flutine | Prizma | Prozac;
  • (IN) India: Barozac | Cadflo | Cozac | Cozac t | Cyclotin | Dawnex | Defutin | Deploid | Depnil | Depoxit | Depten | Depzac | Exiten | F tin | Fadep | Faxtin | Floatin | Flonol | Flood | Floxin | Floxistar | Floxy | Flucap | Fluchem | Flucon | Fludac | Fludawn | Fludep | Fluex | Flugen | Flumeg | Flumod | Flumusa 20 | Flunat | Flunil | Fluoxet | Fluoxetine | Fluriv | Flutee | Flutex | Flutin | Flutine | Flutinol | Flutop | Flutop la | Flux | Fluxal | Fluxater | Fluze | Fuox | Halonet | Latin | Loftil | Lutine | M.codep | Maxitin | Mentol | Neurozac | Noc | Nodep | Normatine | Nuzac | Oxefil | Oxetin | Persona | Platin | Prodac | Prodep | Pronil | Salidep | Serodep | Trizac | Vetodep | Zedep | Zexto;
  • (IS) Iceland: Serol;
  • (IT) Italy: Azur | Clexiclor | Cloriflox | Deprexen | Diesan | Flotina | Fluoxeren | Fluoxetina | Fluoxetina Accord | Fluoxetina almus | Fluoxetina alter | Fluoxetina angenerico | Fluoxetina big | Fluoxetina doc | Fluoxetina drm | Fluoxetina eg | Profelix | Prozac | Xeredien;
  • (JO) Jordan: Anxetin | Diesan | Fluocim | Fluxil | Magrilan | Oxetine | Proxetine | Prozac | Rozax | Salipax;
  • (KE) Kenya: Deprozet | Fludac | Flunil | Fluxil | Modipran | Prodep | Prozac | Serozac;
  • (KR) Korea, Republic of: Antipres | Antipress | Barozac | Danatec | Depren | Deprexin | Difmax | Difxetine | Floctin | Floctine | Flonin | Flotin | Floxetine | Flugen | Fluneurin | Fluox | Fluoxetine | Fluoxetine hcl daewha | Flutin | Fluxetin | Fluxetine | Fonoxetin | Foxetin | Foxtine | Frictin | Fropine | Fucetin | Fulxetin | Furotin | Furoxetine | Furuzac | Fusetin | Fuxetine | Hanall fluoxetine hcl | Hanpro | I xetin | Kukje fluoxetine | Lanclic | Locetin | Lorang | Lotine | Loxetin | Loxetine | Lucetin | Nanotec | Neurozac | Nobsetine | Norzac | Obeflu | Obetine | Oxetine | Oxigreen | Oxygreen | Pms fluoxetine | Ponoxetine | Prajac | Procetin | Proctin | Propine DR5 | Proren | Prozac | Psylotine | Ranclik | Rocetan | Serotine | Seroxetine | Serozac | Sixetine | Sleexetine | Unizac | Urozac | Welfit | Wexetine | Xelectin | Xezac | Yungjin fluoxetine | Zerozac;
  • (KW) Kuwait: Anxetin | Flozak | Fluneurin | Fluxetyl | Prozac | Salipax;
  • (LB) Lebanon: Fluocim | Fluoxetina belmac | Fluoxetine | Fluoxetine biogaran | Fluoxone Divule | Flutin | Fulsac | Neanxetin | Plazeron | Proxetin | Prozac | Rosal | Sartuzin;
  • (LT) Lithuania: Apo fluoxetine | Deprexetin | Deprimaks | Floxet | Fluoxetine | Fluoxetine-mepha | Fluval | Flux | Framex | Magrilan | Nycoflox | Prozac | Salipax;
  • (LU) Luxembourg: Docfluoxetine | Fluoxetin Ratiopharm | Fluoxetine | Fontex | Prozac;
  • (LV) Latvia: Deprenon | Deprex | Deprimax | Floxet | Fluaxen | Fluoxetine | Fluoxetine vitabalans | Fluoxetine-mepha | Fluoxetini | Flux | Framex | Magrilan | Nycoflox | Prozac | Salipax | Seronil;
  • (MA) Morocco: Fluctine | Fluoxet | Fluzoft | Prozac | Serdep | Tuneluz | Vyoxet;
  • (MT) Malta: Fluoxetine-mepha | Salipax;
  • (MX) Mexico: Altoprezol | Aniup | Antynax | Aponeusak | Auroken | Axtin | Bixilan | F exina | Farmaxetina | Flocet | Florexal | Fluctine | Fluneurin | Fluoxac | Fluoxetina | Fluoxetina g.i | Fluoxetina gi | Fluoxetina protein | Fluoxetine | Flutinax | Genozac | Indozul | Laegaudin | Lebensart | Ovisen | Pisaurit | Prodep | Prozac | Quanilene | Regultron | Siquial | Teczac | Ulmely | Vicsel | Xenacan | Zatin | Zertix;
  • (MY) Malaysia: Anzack | Dawnex | FLEXIN | Fluovex | Fluran | Fluxetil | Provatine | Prozac | Salipax | Uxetine;
  • (NG) Nigeria: Seroxetine;
  • (NL) Netherlands: Fluoxetine | Fluoxetine aurobindo | Fluoxetine CF | Fluoxetine PCH | Fluoxetine ratiopharm | Prozac;
  • (NO) Norway: Fluoxetin | Fluoxetin hexal | Fluoxetin viatris | Fluoxetine orion | Fluoxetine vitabalans | Fontex | Nycoflox;
  • (NZ) New Zealand: Arrow Fluoxetine | Fluotex | Fluox | Lovan | Plinzene | Prozac;
  • (OM) Oman: Evorex;
  • (PE) Peru: Dawnex | Depricor | Emozac | Fluoxetina | Fluran | Fluxentac | Neolzina | Ofluoxet | Prozac | Prozac durapac | Sostac;
  • (PH) Philippines: Adep | Adepssir | Deprizac | Magrilan | Motivest | Neuxetin | Oxedep | Prodin | Prozac;
  • (PK) Pakistan: Advance | Alert | Astovas | Azene | Besquil | Cyconil | Dep-nil | Depex | Deplow | Deporex | Depranil | Deprezac | Depricap | Deprox | Deptin | Duzest | Extine | F tine | Faxetine | Felix | Flectin | Flit | Flotin | Flouxac | Floxac | Floxitol | Fluoxe-Scot | Flute | Flutin | Flux | Fluxafin | Fluxil | Fluxit | Foxatin | Freezak | Futine | Galaxy | Geoxit | Modipran | Neozac | Optimist | Oxetin | Phloxetin | Prolert | Prolyd | Prome | Prozac | Prozyn | Reset | Rize | Rozax | Sero ze | Seronil | Serratol | Tepaxor | Traxectin | Ufrex | Vonder | Xetin | Xotin | Zacpro | Zauxit;
  • (PL) Poland: Andepin | Bioxetin | Deprexetin | Fluoksetyna | Fluoksetyna Egis | Fluoxetin | Fluoxetine aurovitas | Fluoxetine vitabalans | Fluxemed | Prozac | Salipax | Seronil | Xetiran;
  • (PR) Puerto Rico: Fluoxetine | Fluoxetine HCL | Prozac | Sarafem;
  • (PT) Portugal: Digassim | Fluoxetina | Fluoxetina Accord | Fluoxetina apceuticals | Fluoxetina aurovitas | Fluoxetina azevedos | Fluoxetina Daquimed | Fluoxetina odipe | Fluoxetina tuneluz | Fluoxetine-mepha | Fluxin | Nodepe | Prozac | Psipax | Salipax | Selectus | Tuneluz;
  • (PY) Paraguay: Actan | Conexine | Confium | Eximius | Fluoxetina chile | Fluoxetina dallas | Fluoxetina genfar | Fluoxetina la sante | Fluoxetina mintlab | Fluoxetina phi | Fluoxetina ragusa | Frendix | Plenocer | Pragmaten | Somatin | Sostac | Tonovital;
  • (QA) Qatar: Anextin | Evorex | Flozak | Flunurine | Flutin | Fluzyn | Linz | Proxetine | Prozac | Rozax | Salipax;
  • (RO) Romania: Anxetin | Floxet | Fluocim | Fluohexal | Fluoxetin lph | Fluoxetine | Fluoxin | Fluran | Fluval | Fluxonil;
  • (RU) Russian Federation: Apo fluoxetin | Apo fluoxetine | Deprenon | Floxet | Flunisan | Fluoxetine | Fluoxetine canon | Fluoxetine hexal | Fluoxetine lannacher | Fluval | Fluxonil | Framex | Portal | Prodep | Profluzac | Prozac;
  • (SA) Saudi Arabia: Anxetin | Flozak | Fluoxetin hexal | Fluoxetine | Fluxetyl | Fluzyn | Linz | Oxetine | Pms fluoxetine | Prozac | Salipax;
  • (SE) Sweden: Fluoxetin Bioglan | Fluoxetin Mylan | Fluoxetin Ratiopharm | Fluoxetin Sandoz | Fluoxetin Selena | Fluoxetin Stada | Fluoxetin Teva | Fluoxetine accord | Fluoxetine orion | Fluoxetine vitabalans | Fluxantin | Fontex | Fontex Basal;
  • (SG) Singapore: Apo fluoxetine | Deprexin | Fluoxetine | Fluxetil | Fluxil | Foxtin | Magrilan | Proctin | Prozac | Zactin;
  • (SI) Slovenia: Fluoksetin Vitabalans | Fluval | Portal | Prozac | Salipax;
  • (SK) Slovakia: Deprenon | Deprex | Floxet | Fluoxetine vitabalans | Fluval | Fluxonil | Hapilux | Magrilan;
  • (SR) Suriname: Apo fluoxetine | Fluoxetine | Fluoxetine aurobindo | Fluoxetine mylan;
  • (TH) Thailand: Actisac | Anzac | Britezac | Cefu | Deproxin | F Zac | Flulox | Flumed | Fluoxan | Fluoxetine | Fluoxine | Flusac | Flutine | Fluxetil | Fluxetin | Fluzac | Fluzac-20 | Foxetin | Fulox | Hapilux | Loxetine | Magrilan | Oxetine | Oxsac | Prodep | Proxetin | Prozac | Staroxtin | Unprozy | Upsac | Xelotin | Xetin;
  • (TN) Tunisia: Anxetin | Dinalexin | Prozac | Rosal | Serotyl;
  • (TR) Turkey: Depreks | Depset | Florak | Foxeteva | Fulsac | Loksetin | Prozac | Seronil | Zedprex;
  • (TW) Taiwan: Apo fluoxetine | Floxt | Fluoxetin | Fluoxetine | Fluronin | Flux | Fluxen | Juxac | Kinxetine | Prozac | Prozac durapac | Seronil | Serotec | Sinzac | U-Zet | Uxetine | Zactin;
  • (UA) Ukraine: Fluoxetin Kmp | Fluoxetine | Flutisal | Fluxen | Framex | Portal | Prodep | Prozac;
  • (UG) Uganda: Fluoxiren | Magrilan | Nuzac;
  • (UY) Uruguay: Depreless | Floxet | Fluodep | Fluoxetina | Fluoxetina Szabo | Foxetin | Luserpal | Mitilase | Neupax | Vidacil;
  • (VE) Venezuela, Bolivarian Republic of: Anoxen | Antipres | Fluoxetina | Fluran | Fluzac | Prozac | Psiquial;
  • (VN) Viet Nam: Fluotin | Lugtils | Mawel | Nilkey | Oxeflu;
  • (ZA) South Africa: A L Fluoxetine | Apo fluoxetine | Deprozan | Fluoxetine | Fluoxetine Actor | Fluoxitine unimed | Lilly-fluoxetine | Lorien | Micro Fluoxetine | Nuzak | Prohexal | Prolax | Prozac | Ranflocs | Rezak | Rolab-fluoxetine | Sanzur | Trizac;
  • (ZM) Zambia: Fludac | Prozac;
  • (ZW) Zimbabwe: Dawnex | Oxedep
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