Version May 2024
Loxapine inhalation can cause bronchospasm that has the potential to lead to respiratory distress and respiratory arrest, particularly in patients with lung diseases. Administer loxapine inhalation only in a certified health care setting that has immediate access on site to supplies and health care professionals competent in the management of acute bronchospasm and access to emergency assistance for symptoms that require immediate medical attention. Certified health care settings must have a short-acting bronchodilator (eg, albuterol) available for the immediate treatment of bronchospasm; this short-acting bronchodilator can be delivered by inhaler (with spacer) or nebulizer. Prior to administering loxapine inhalation, screen patients regarding a current diagnosis, history, or symptoms of asthma, chronic obstructive pulmonary disease (COPD), and other lung diseases, and assess (including chest auscultation) patients for respiratory signs. Monitor for signs and symptoms of bronchospasm following treatment with loxapine inhalation.
Because of the risk of bronchospasm, loxapine inhalation is available only through a restricted program under a risk evaluation and mitigation strategy (REMS) called the Adasuve REMS.
Elderly patients with dementia-related psychosis treated with antipsychotic drugs are at an increased risk of death. Loxapine is not approved for the treatment of patients with dementia-related psychosis.
Schizophrenia:
Oral: Initial: 10 mg twice daily; initial doses of up to 50 mg/day may be considered in patients with severe symptoms. Gradually increase dose based on response and tolerability up to a usual maintenance dose of 20 to 100 mg/day in 2 to 4 divided doses (maximum: 250 mg/day).
IM [Canadian product]:
Note: Reserve injection for patients unable to tolerate oral administration; convert to oral dosage form with symptom control and ability to tolerate oral administration.
IM: 12.5 to 50 mg every 4 to 6 hours or longer; individualize dose early in therapy; some patients respond satisfactorily to twice-daily dosing.
Acute treatment of agitation associated with schizophrenia or bipolar I disorder: Inhalation: 10 mg once daily; maximum dose: 10 mg per 24-hour period
Discontinuation of therapy: In the treatment of chronic psychiatric disease, switching therapy rather than discontinuation is generally advised if side effects are intolerable or treatment is not effective. If patient insists on stopping treatment, gradual dose reduction of oral dose (ie, over several weeks to months) is advised to detect a re-emergence of symptoms and to avoid withdrawal reactions (eg, agitation, alternating feelings of warmth and chill, anxiety, diaphoresis, dyskinesias, GI symptoms, insomnia, irritability, myalgia, paresthesia, psychosis, restlessness, rhinorrhea, tremor, vertigo) unless discontinuation is due to significant adverse effects. Monitor closely to allow for detection of prodromal symptoms of disease recurrence (Ref).
Switching antipsychotics: An optimal universal strategy for switching antipsychotic drugs has not been established. Strategies include cross-titration (gradually discontinuing the first antipsychotic while gradually increasing the new antipsychotic) and abrupt change (abruptly discontinuing the first antipsychotic and either increasing the new antipsychotic gradually or starting it at a treatment dose). In patients with schizophrenia at high risk of relapse, the current medication may be maintained at full dose as the new medication is increased (ie, overlap); once the new medication is at therapeutic dose, the first medication is gradually decreased and discontinued over 1 to 2 weeks (Ref). Based upon clinical experience, some experts generally prefer cross-titration and overlap approaches rather than abrupt change (Ref).
Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.
Inhalation: No dosage adjustment necessary.
Oral: There are no dosage adjustments provided in the manufacturer’s labeling.
Inhalation: No dosage adjustment necessary.
Oral: There are no dosage adjustments provided in the manufacturer’s labeling.
Note: Avoid for behavioral problems associated with dementia or delirium unless alternative nonpharmacologic therapies have failed and patient may harm self or others. If used, consider deprescribing attempts to assess continued need and/or lowest effective dose. Of note: use in certain indications may be appropriate (eg, schizophrenia, bipolar disorder) (Ref).
Refer to adult dosing. Dosages in the lower range of recommended adult dosing are generally sufficient with late-onset schizophrenia or psychosis. Titrate dosage slowly and monitor carefully (Ref).
The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified.
Inhalation:
>10%:
Gastrointestinal: Dysgeusia (14%)
Nervous system: Sedated state (12%)
Respiratory: Respiratory distress (asthma patients: 54%; COPD patients: 19%; includes bronchospasm, chest pain, cough, dyspnea, pharyngeal edema, wheezing)
1% to 10%:
Cardiovascular: Hypotension (3%), syncope (2%)
Respiratory: Throat irritation (3%)
<1%: Nervous system: Extrapyramidal reaction
Frequency not defined: Hypersensitivity: Hypersensitivity reaction
Oral:
Frequency not defined:
Cardiovascular: ECG changes, edema, flushing (facial), hypertension, hypotension, orthostatic hypotension, syncope, tachycardia
Dermatologic: Alopecia, dermatitis, pruritus, seborrhea, skin photosensitivity, skin rash
Endocrine & metabolic: Amenorrhea, galactorrhea not associated with childbirth, gynecomastia, hyperprolactinemia, menstrual disease, polydipsia, weight gain, weight loss
Gastrointestinal: Constipation, nausea, paralytic ileus, vomiting, xerostomia
Genitourinary: Impotence, priapism (rare), urinary retention
Hematologic & oncologic: Agranulocytosis, leukopenia, thrombocytopenia
Hepatic: Hepatitis, increased serum alanine aminotransferase, increased serum aspartate aminotransferase, jaundice
Nervous system: Agitation, confusion, disruption of body temperature regulation, dizziness, drowsiness, extrapyramidal reaction (akathisia, akinesia, dystonia, drug-induced Parkinson's disease, tardive dyskinesia), headache, hyperpyrexia, insomnia, neuroleptic malignant syndrome, numbness, paresthesia, sedated state, seizure, slurred speech, tension, unsteady gait
Neuromuscular & skeletal: Asthenia, muscle twitching
Ophthalmic: Blepharoptosis, blurred vision
Respiratory: Dyspnea, nasal congestion
Postmarketing (any route): Cardiovascular: Atrial fibrillation (Chou 2017), atrial flutter (Chou 2017)
Oral: Hypersensitivity to loxapine or any component of the formulation; severe drug-induced CNS depression; coma.
Inhalation: Known hypersensitivity to loxapine, amoxapine, or any component of the formulation; current diagnosis or history of asthma, COPD, or other lung disease associated with bronchospasm; acute respiratory symptoms or signs (eg, wheezing); current use of medications to treat airways disease, such as asthma or COPD; history of bronchospasm following loxapine treatment.
Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.
Canadian labeling: Additional contraindication (not in US labeling): Oral, IM: Circulatory collapse or severe heart disorder; concomitant use of metoclopramide; scheduled regional or spinal anesthesia; brain damage, liver disorders, renal insufficiency, pheochromocytoma and blood dyscrasias.
Concerns related to adverse effects:
• Anticholinergic effects: May cause anticholinergic effects (constipation, xerostomia, blurred vision, urinary retention); use with caution in patients with decreased GI motility, paralytic ileus, urinary retention, BPH, xerostomia, glaucoma, or visual problems. Relative to other antipsychotics, loxapine has a low potency of cholinergic blockade (Richelson 1999).
• Blood dyscrasias: Leukopenia, neutropenia, and agranulocytosis (sometimes fatal) have been reported in clinical trials and postmarketing reports with antipsychotic use; presence of risk factors (eg, preexisting low WBC or history of drug-induced leuko-/neutropenia) should prompt periodic blood count assessment. Discontinue therapy at first signs of blood dyscrasias or if absolute neutrophil count <1,000/mm3.
• CNS depression: May cause CNS depression, which may impair physical or mental abilities; patients must be cautioned about performing tasks that require mental alertness (eg, operating machinery, driving). Sedation can also mask signs of bronchospasm.
• Esophageal dysmotility/aspiration: Antipsychotic use has been associated with esophageal dysmotility and aspiration; risk increases with age. Use with caution in patients at risk for aspiration pneumonia (ie, Alzheimer disease), particularly in patients >75 years (Herzig 2017; Maddalena 2004).
• Extrapyramidal symptoms: May cause extrapyramidal symptoms (EPS), including pseudoparkinsonism, acute dystonic reactions, akathisia, and tardive dyskinesia. Risk of dystonia (and possibly other EPS) may be greater with increased doses, use of conventional antipsychotics, males, and younger patients. Factors associated with greater vulnerability to tardive dyskinesia include older in age, female gender combined with postmenopausal status, Parkinson disease, pseudoparkinsonism symptoms, affective disorders (particularly major depressive disorder), concurrent medical diseases such as diabetes, previous brain damage, alcoholism, poor treatment response, and use of high doses of antipsychotics (APA [Keepers 2020]; Soares-Weiser 2007). Consider therapy discontinuation with signs/symptoms of tardive dyskinesia. Increased incidence of EPS has been observed with IM administration compared to oral administration.
• Falls: May increase the risk for falls due to somnolence, orthostatic hypotension, and motor or sensory instability.
• Hyperprolactinemia: Antipsychotic use has been associated with increased prolactin levels; clinical significance of hyperprolactinemia in patients with breast cancer or other prolactin-dependent tumors is unknown (APA [Keepers 2020]; Pollack 1993; Wang 2002).
• Hypotension: May cause hypotension, orthostatic hypotension, and syncope; use with caution in patients at risk of this effect or in those who would not tolerate transient hypotensive episodes (cerebrovascular disease, cardiovascular disease, dehydration, hypovolemia, or concurrent medication use that may predispose to hypotension/bradycardia).
• Neuroleptic malignant syndrome (NMS): NMS has been associated with use of antipsychotic agents; monitor for hyperpyrexia, mental status changes, fever, muscle rigidity, and/or autonomic instability. Discontinue treatment immediately with onset of NMS; recurrence has been reported in patients rechallenged with antipsychotic therapy.
• Ocular effects: Antipsychotic use has been associated with pigmentary retinopathy, and lenticular and corneal deposits, particularly with prolonged therapy (Oshika 1995).
• Temperature regulation: Antipsychotic use has been associated with impaired core body temperature regulation; caution with strenuous exercise, heat exposure, dehydration, and concomitant medication possessing anticholinergic effects (Kerwin 2004; Kwok 2005; Martinez 2002).
Disease-related concerns:
• Cardiovascular disease: Use with caution in patients with cardiovascular disease.
• Dementia: Most deaths in elderly patients with dementia-related psychosis treated with antipsychotics appeared to be either cardiovascular (eg, heart failure, sudden death) or infectious (eg, pneumonia) in nature. Use with caution in patients with Lewy body dementia or Parkinson disease dementia due to greater risk of adverse effects, increased sensitivity to extrapyramidal effects, and association with irreversible cognitive decompensation or death. The APA recommends giving preference to second generation antipsychotics over first generation antipsychotics in elderly patients with dementia-related psychosis due to a potentially greater risk of harm relative to second generation antipsychotics (APA [Reus 2016]). Loxapine is not approved for the treatment of dementia-related psychosis.
• Seizure disorder: Use with caution in patients at risk of seizures, including those with a history of seizures, head trauma, brain damage, alcoholism, or concurrent therapy with medications which may lower seizure threshold.
Other warnings/precautions:
• Discontinuation of therapy: When discontinuing antipsychotic therapy, gradually taper antipsychotics to avoid physical withdrawal symptoms and rebound symptoms (APA [Keepers 2020]; WFSBP [Hasan 2012]). Withdrawal symptoms may include agitation, alternating feelings of warmth and cold, anxiety, diaphoresis, dyskinesia, GI symptoms, insomnia, irritability, myalgia, paresthesia, psychosis, restlessness, rhinorrhea, tremor, and vertigo (Lambert 2007; Moncrieff 2020). The risk of withdrawal symptoms is highest following abrupt discontinuation of highly anticholinergic or dopaminergic antipsychotics (Cerovecki 2013). Patients with chronic symptoms, repeated relapses, and clear diagnostic features of schizophrenia are at risk for poor outcomes if medications are discontinued (APA [Keepers 2020]).
Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product
Aerosol Powder Breath Activated, Inhalation:
Adasuve: 10 mg (1 ea)
Aerosol Powder Breath Activated, Inhalation [preservative free]:
Adasuve: 10 mg (1 ea [DSC])
Capsule, Oral:
Generic: 5 mg, 10 mg, 25 mg, 50 mg
May be product dependent
Aerosol powder (Adasuve Inhalation)
10 mg (per each): $180.00
Capsules (Loxapine Succinate Oral)
5 mg (per each): $0.79 - $0.99
10 mg (per each): $1.05 - $1.28
25 mg (per each): $1.58 - $1.92
50 mg (per each): $2.20 - $2.57
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.
Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product
Concentrate, Oral:
Xylac: 25 mg/mL ([DSC])
Solution, Intramuscular:
Loxapac: 50 mg/mL (1 mL) [contains polysorbate 80, propylene glycol]
Tablet, Oral:
Xylac: 2.5 mg, 10 mg
Xylac: 25 mg [contains fd&c red #40(allura red ac)aluminum lake]
Generic: 5 mg, 10 mg, 25 mg, 50 mg
Inhalation: Must be administered only by a health care professional. Instruct patient to exhale fully. Use inhaler on inspiration and instruct patient to hold breath as long as possible, up to 10 seconds. Check that the green light turns off indicating the dose has been delivered. If the light remains on after the patient inhales, the full dose was not delivered. Repeat inhalation up to 2 additional times. If green light still does not turn off, discard inhaler and use a new one. Inhaler may produce a flash of light and clicking sound, and become warm with use; this is normal. Discard after one use.
Oral solution [Canadian product]: Mix prior to administration.
Solution for injection [Canadian product] is administered by IM injection. Do not administer IV
Adasuve: An FDA-approved patient medication guide, which is available with the product information and at https://www.accessdata.fda.gov/drugsatfda_docs/label/2022/022549s010lbl.pdf#page=28, must be dispensed with this medication.
Schizophrenia: IM, Oral: Treatment of schizophrenia.
Agitation associated with schizophrenia or bipolar I disorder: Inhalation: Acute treatment of agitation associated with schizophrenia or bipolar I disorder in adults. Note: As part of the Adasuve REMS program to mitigate the risk of bronchospasm, loxapine inhalation must be administered only in a certified health care setting.
Loxitane [DSC] may be confused with FLUoxetine, Lexapro, Soriatane.
Beers Criteria: Antipsychotics are identified in the Beers Criteria as potentially inappropriate medications to be avoided in patients 65 years and older due to an increased risk of stroke and a greater rate of cognitive decline and mortality in patients with dementia. Evidence also suggests there may be an increased risk of mortality with use independent of dementia. Avoid antipsychotics for behavioral problems associated with dementia or delirium unless alternative nonpharmacologic therapies have failed and patient may harm self or others. In addition, antipsychotics should be used with caution in older adults due to their potential to cause or exacerbate syndrome of inappropriate antidiuretic hormone secretion (SIADH) or hyponatremia; monitor sodium closely with initiation or dosage adjustments in older adults. Use of antipsychotics may be appropriate for labeled indications including schizophrenia, bipolar disorder, Parkinson disease psychosis, adjunctive therapy in major depressive disorder, or for short-term use as an antiemetic (Beers Criteria [AGS 2023]).
Loxitane [US] may be confused with Lexotan which is a brand name for bromazepam [multiple international markets].
Substrate of CYP1A2 (minor), CYP2D6 (minor), CYP3A4 (minor); Note: Assignment of Major/Minor substrate status based on clinically relevant drug interaction potential
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 Lexicomp drug interactions program by clicking on the “Launch drug interactions program” link above.
Acetylcholinesterase Inhibitors: May diminish the therapeutic effect of Anticholinergic Agents. Anticholinergic Agents may diminish the therapeutic effect of Acetylcholinesterase Inhibitors. Risk C: Monitor therapy
Aclidinium: May enhance the anticholinergic effect of Anticholinergic Agents. Risk X: Avoid combination
Agents to Treat Airway Disease: May enhance the adverse/toxic effect of Loxapine. More specifically, the use of Agents to Treat Airway Disease is likely a marker of patients who are likely at a greater risk for experiencing significant bronchospasm from use of inhaled loxapine. Management: This is specific to the Adasuve brand of loxapine, which is an inhaled formulation. This does not apply to non-inhaled formulations of loxapine. Risk X: Avoid combination
Agents With Seizure Threshold Lowering Potential: May enhance the adverse/toxic effect of Loxapine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Alcohol (Ethyl): CNS Depressants may enhance the CNS depressant effect of Alcohol (Ethyl). Risk C: Monitor therapy
Alizapride: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Amifampridine: Agents With Seizure Threshold Lowering Potential may enhance the neuroexcitatory and/or seizure-potentiating effect of Amifampridine. Risk C: Monitor therapy
Amisulpride (Oral): May enhance the adverse/toxic effect of Antipsychotic Agents. Specifically, the risk of neuroleptic malignant syndrome or increased QTc interval may be increased. Risk C: Monitor therapy
Amisulpride (Oral): Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Amisulpride (Oral). Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Anticholinergic Agents: May enhance the adverse/toxic effect of other Anticholinergic Agents. Risk C: Monitor therapy
Anti-Parkinson Agents (Dopamine Agonist): May diminish the therapeutic effect of Antipsychotic Agents (First Generation [Typical]). Antipsychotic Agents (First Generation [Typical]) may diminish the therapeutic effect of Anti-Parkinson Agents (Dopamine Agonist). Management: Avoid concomitant therapy if possible. If antipsychotic use is necessary, consider using atypical antipsychotics such as clozapine, quetiapine, or ziprasidone at lower initial doses, or a non-dopamine antagonist (eg, pimavanserin). Risk D: Consider therapy modification
ARIPiprazole: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of ARIPiprazole. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
ARIPiprazole Lauroxil: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of ARIPiprazole Lauroxil. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Asenapine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Asenapine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Azelastine (Nasal): May enhance the CNS depressant effect of CNS Depressants. Risk X: Avoid combination
Benperidol: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Benperidol. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Blonanserin: CNS Depressants may enhance the CNS depressant effect of Blonanserin. Management: Use caution if coadministering blonanserin and CNS depressants; dose reduction of the other CNS depressant may be required. Strong CNS depressants should not be coadministered with blonanserin. Risk D: Consider therapy modification
Botulinum Toxin-Containing Products: May enhance the anticholinergic effect of Anticholinergic Agents. Risk C: Monitor therapy
Brexanolone: CNS Depressants may enhance the CNS depressant effect of Brexanolone. Risk C: Monitor therapy
Brexpiprazole: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Brexpiprazole. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Brimonidine (Topical): May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Bromopride: May enhance the adverse/toxic effect of Antipsychotic Agents. Risk X: Avoid combination
Bromperidol: May enhance the CNS depressant effect of CNS Depressants. Risk X: Avoid combination
Buprenorphine: CNS Depressants may enhance the CNS depressant effect of Buprenorphine. Management: Consider reduced doses of other CNS depressants, and avoiding such drugs in patients at high risk of buprenorphine overuse/self-injection. Initiate buprenorphine at lower doses in patients already receiving CNS depressants. Risk D: Consider therapy modification
BuPROPion: May enhance the neuroexcitatory and/or seizure-potentiating effect of Agents With Seizure Threshold Lowering Potential. Risk C: Monitor therapy
Cabergoline: May diminish the therapeutic effect of Antipsychotic Agents. Risk X: Avoid combination
Cannabinoid-Containing Products: Anticholinergic Agents may enhance the tachycardic effect of Cannabinoid-Containing Products. Risk C: Monitor therapy
Cannabinoid-Containing Products: CNS Depressants may enhance the CNS depressant effect of Cannabinoid-Containing Products. Risk C: Monitor therapy
CarBAMazepine: Loxapine may increase serum concentrations of the active metabolite(s) of CarBAMazepine. Risk C: Monitor therapy
Cariprazine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Cariprazine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Chloral Betaine: May enhance the adverse/toxic effect of Anticholinergic Agents. Risk C: Monitor therapy
Chlormethiazole: May enhance the CNS depressant effect of CNS Depressants. Management: Monitor closely for evidence of excessive CNS depression. The chlormethiazole labeling states that an appropriately reduced dose should be used if such a combination must be used. Risk D: Consider therapy modification
Chlorphenesin Carbamate: May enhance the adverse/toxic effect of CNS Depressants. Risk C: Monitor therapy
ChlorproMAZINE: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of ChlorproMAZINE. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Chlorprothixene: Anticholinergic Agents may enhance the anticholinergic effect of Chlorprothixene. Risk C: Monitor therapy
Cimetropium: Anticholinergic Agents may enhance the anticholinergic effect of Cimetropium. Risk X: Avoid combination
Clothiapine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Clothiapine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
CloZAPine: Anticholinergic Agents may enhance the constipating effect of CloZAPine. Management: Consider alternatives to this combination whenever possible. If combined, monitor closely for signs and symptoms of gastrointestinal hypomotility and consider prophylactic laxative treatment. Risk D: Consider therapy modification
CNS Depressants: May enhance the adverse/toxic effect of other CNS Depressants. Risk C: Monitor therapy
Daridorexant: May enhance the CNS depressant effect of CNS Depressants. Management: Dose reduction of daridorexant and/or any other CNS depressant may be necessary. Use of daridorexant with alcohol is not recommended, and the use of daridorexant with any other drug to treat insomnia is not recommended. Risk D: Consider therapy modification
Deutetrabenazine: May enhance the adverse/toxic effect of Antipsychotic Agents. Specifically, the risk for akathisia, parkinsonism, or neuroleptic malignant syndrome may be increased. Risk C: Monitor therapy
DexmedeTOMIDine: CNS Depressants may enhance the CNS depressant effect of DexmedeTOMIDine. Management: Monitor for increased CNS depression during coadministration of dexmedetomidine and CNS depressants, and consider dose reductions of either agent to avoid excessive CNS depression. Risk D: Consider therapy modification
Difelikefalin: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Dimethindene (Topical): May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Donepezil: May enhance the neurotoxic (central) effect of Antipsychotic Agents. Risk C: Monitor therapy
Doxylamine: CNS Depressants may enhance the CNS depressant effect of Doxylamine. Risk C: Monitor therapy
DroPERidol: May enhance the CNS depressant effect of CNS Depressants. Management: Consider dose reductions of droperidol or of other CNS agents (eg, opioids, barbiturates) with concomitant use. Risk D: Consider therapy modification
Eluxadoline: Anticholinergic Agents may enhance the constipating effect of Eluxadoline. Risk X: Avoid combination
Esketamine: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Flunarizine: CNS Depressants may enhance the CNS depressant effect of Flunarizine. Risk X: Avoid combination
Flunitrazepam: CNS Depressants may enhance the CNS depressant effect of Flunitrazepam. Management: Reduce the dose of CNS depressants when combined with flunitrazepam and monitor patients for evidence of CNS depression (eg, sedation, respiratory depression). Use non-CNS depressant alternatives when available. Risk D: Consider therapy modification
Flupentixol: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Flupentixol. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
FluPHENAZine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of FluPHENAZine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Galantamine: May enhance the neurotoxic (central) effect of Antipsychotic Agents. Risk C: Monitor therapy
Gastrointestinal Agents (Prokinetic): Anticholinergic Agents may diminish the therapeutic effect of Gastrointestinal Agents (Prokinetic). Risk C: Monitor therapy
Glucagon: Anticholinergic Agents may enhance the adverse/toxic effect of Glucagon. Specifically, the risk of gastrointestinal adverse effects may be increased. Risk C: Monitor therapy
Glycopyrrolate (Oral Inhalation): Anticholinergic Agents may enhance the anticholinergic effect of Glycopyrrolate (Oral Inhalation). Risk X: Avoid combination
Glycopyrronium (Topical): May enhance the anticholinergic effect of Anticholinergic Agents. Risk X: Avoid combination
Guanethidine: Antipsychotic Agents may diminish the therapeutic effect of Guanethidine. Risk C: Monitor therapy
Haloperidol: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Haloperidol. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Huperzine A: May enhance the neurotoxic (central) effect of Antipsychotic Agents. Risk C: Monitor therapy
HydrOXYzine: May enhance the CNS depressant effect of CNS Depressants. Management: Consider a decrease in the CNS depressant dose, as appropriate, when used together with hydroxyzine. Increase monitoring of signs/symptoms of CNS depression in any patient receiving hydroxyzine together with another CNS depressant. Risk D: Consider therapy modification
Iloperidone: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Iloperidone. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Iohexol: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Iohexol. Specifically, the risk for seizures may be increased. Management: Discontinue agents that may lower the seizure threshold 48 hours prior to intrathecal use of iohexol. Wait at least 24 hours after the procedure to resume such agents. In nonelective procedures, consider use of prophylactic antiseizure drugs. Risk D: Consider therapy modification
Iomeprol: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Iomeprol. Specifically, the risk for seizures may be increased. Management: Discontinue agents that may lower the seizure threshold 48 hours prior to intrathecal use of iomeprol. Wait at least 24 hours after the procedure to resume such agents. In nonelective procedures, consider use of prophylactic antiseizure drugs. Risk D: Consider therapy modification
Iopamidol: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Iopamidol. Specifically, the risk for seizures may be increased. Management: Discontinue agents that may lower the seizure threshold 48 hours prior to intrathecal use of iopamidol. Wait at least 24 hours after the procedure to resume such agents. In nonelective procedures, consider use of prophylactic antiseizure drugs. Risk D: Consider therapy modification
Ipratropium (Oral Inhalation): May enhance the anticholinergic effect of Anticholinergic Agents. Risk X: Avoid combination
Itopride: Anticholinergic Agents may diminish the therapeutic effect of Itopride. Risk C: Monitor therapy
Ixabepilone: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Kava Kava: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Kratom: May enhance the CNS depressant effect of CNS Depressants. Risk X: Avoid combination
Lemborexant: May enhance the CNS depressant effect of CNS Depressants. Management: Dosage adjustments of lemborexant and of concomitant CNS depressants may be necessary when administered together because of potentially additive CNS depressant effects. Close monitoring for CNS depressant effects is necessary. Risk D: Consider therapy modification
Levosulpiride: Anticholinergic Agents may diminish the therapeutic effect of Levosulpiride. Risk X: Avoid combination
Lithium: May enhance the neurotoxic effect of Antipsychotic Agents. Lithium may decrease the serum concentration of Antipsychotic Agents. Specifically noted with chlorpromazine. Risk C: Monitor therapy
Lofexidine: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
LORazepam: Loxapine may enhance the adverse/toxic effect of LORazepam. Specifically, prolonged stupor, respiratory depression, and/or hypotension. Risk C: Monitor therapy
Lumateperone: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Lumateperone. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Lurasidone: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Lurasidone. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Magnesium Sulfate: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Mequitazine: Antipsychotic Agents may enhance the arrhythmogenic effect of Mequitazine. Management: Consider alternatives to one of these agents when possible. While this combination is not specifically contraindicated, mequitazine labeling describes this combination as discouraged. Risk D: Consider therapy modification
Methotrimeprazine: CNS Depressants may enhance the CNS depressant effect of Methotrimeprazine. Methotrimeprazine may enhance the CNS depressant effect of CNS Depressants. Management: Reduce the usual dose of CNS depressants by 50% if starting methotrimeprazine until the dose of methotrimeprazine is stable. Monitor patient closely for evidence of CNS depression. Risk D: Consider therapy modification
Metoclopramide: May enhance the adverse/toxic effect of Antipsychotic Agents. Risk X: Avoid combination
MetyroSINE: May enhance the adverse/toxic effect of Antipsychotic Agents. Specifically, the risk for extrapyramidal symptoms and excessive sedation may be increased. Risk C: Monitor therapy
Mianserin: May enhance the anticholinergic effect of Anticholinergic Agents. Risk C: Monitor therapy
Minocycline (Systemic): May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Mirabegron: Anticholinergic Agents may enhance the adverse/toxic effect of Mirabegron. Risk C: Monitor therapy
Molindone: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Molindone. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Nabilone: May enhance the CNS depressant effect of CNS Depressants. Risk X: Avoid combination
Nitroglycerin: Anticholinergic Agents may decrease the absorption of Nitroglycerin. Specifically, anticholinergic agents may decrease the dissolution of sublingual nitroglycerin tablets, possibly impairing or slowing nitroglycerin absorption. Risk C: Monitor therapy
OLANZapine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of OLANZapine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Olopatadine (Nasal): May enhance the CNS depressant effect of CNS Depressants. Risk X: Avoid combination
Opioid Agonists: CNS Depressants may enhance the CNS depressant effect of Opioid Agonists. Management: Avoid concomitant use of opioid agonists and benzodiazepines or other CNS depressants when possible. These agents should only be combined if alternative treatment options are inadequate. If combined, limit the dosages and duration of each drug. Risk D: Consider therapy modification
Orphenadrine: CNS Depressants may enhance the CNS depressant effect of Orphenadrine. Risk X: Avoid combination
Oxatomide: May enhance the anticholinergic effect of Anticholinergic Agents. Risk X: Avoid combination
Oxomemazine: May enhance the CNS depressant effect of CNS Depressants. Risk X: Avoid combination
Oxybate Salt Products: CNS Depressants may enhance the CNS depressant effect of Oxybate Salt Products. Management: Consider alternatives to this combination when possible. If combined, dose reduction or discontinuation of one or more CNS depressants (including the oxybate salt product) should be considered. Interrupt oxybate salt treatment during short-term opioid use Risk D: Consider therapy modification
OxyCODONE: CNS Depressants may enhance the CNS depressant effect of OxyCODONE. Management: Avoid concomitant use of oxycodone and benzodiazepines or other CNS depressants when possible. These agents should only be combined if alternative treatment options are inadequate. If combined, limit the dosages and duration of each drug. Risk D: Consider therapy modification
Paliperidone: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Paliperidone. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Paraldehyde: CNS Depressants may enhance the CNS depressant effect of Paraldehyde. Risk X: Avoid combination
Perampanel: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Periciazine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Periciazine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Perphenazine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Perphenazine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Pimozide: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Pimozide. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Pipamperone [INT]: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Pipamperone [INT]. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Piribedil: Antipsychotic Agents may diminish the therapeutic effect of Piribedil. Piribedil may diminish the therapeutic effect of Antipsychotic Agents. Management: Use of piribedil with antiemetic neuroleptics is contraindicated, and use with antipsychotic neuroleptics, except for clozapine, is not recommended. Risk X: Avoid combination
Polyethylene Glycol-Electrolyte Solution: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Polyethylene Glycol-Electrolyte Solution. Specifically, the risk of seizure may be increased. Risk C: Monitor therapy
Potassium Chloride: Anticholinergic Agents may enhance the ulcerogenic effect of Potassium Chloride. Management: Patients on drugs with substantial anticholinergic effects should avoid using any solid oral dosage form of potassium chloride. Risk X: Avoid combination
Potassium Citrate: Anticholinergic Agents may enhance the ulcerogenic effect of Potassium Citrate. Management: Patients on drugs with substantial anticholinergic effects should avoid using any solid oral dosage form of potassium citrate. Risk X: Avoid combination
Pramlintide: May enhance the anticholinergic effect of Anticholinergic Agents. These effects are specific to the GI tract. Risk X: Avoid combination
Procarbazine: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Prochlorperazine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Prochlorperazine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Promazine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Promazine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
QUEtiapine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of QUEtiapine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Quinagolide: Antipsychotic Agents may diminish the therapeutic effect of Quinagolide. Risk C: Monitor therapy
Ramosetron: Anticholinergic Agents may enhance the constipating effect of Ramosetron. Risk C: Monitor therapy
Revefenacin: Anticholinergic Agents may enhance the anticholinergic effect of Revefenacin. Risk X: Avoid combination
RisperiDONE: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of RisperiDONE. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Rivastigmine: Anticholinergic Agents may diminish the therapeutic effect of Rivastigmine. Rivastigmine may diminish the therapeutic effect of Anticholinergic Agents. Management: Use of rivastigmine with an anticholinergic agent is not recommended unless clinically necessary. If the combination is necessary, monitor for reduced anticholinergic effects. Risk D: Consider therapy modification
Ropeginterferon Alfa-2b: CNS Depressants may enhance the adverse/toxic effect of Ropeginterferon Alfa-2b. Specifically, the risk of neuropsychiatric adverse effects may be increased. Management: Avoid coadministration of ropeginterferon alfa-2b and other CNS depressants. If this combination cannot be avoided, monitor patients for neuropsychiatric adverse effects (eg, depression, suicidal ideation, aggression, mania). Risk D: Consider therapy modification
Rufinamide: May enhance the adverse/toxic effect of CNS Depressants. Specifically, sleepiness and dizziness may be enhanced. Risk C: Monitor therapy
Secretin: Anticholinergic Agents may diminish the therapeutic effect of Secretin. Management: Avoid concomitant use of anticholinergic agents and secretin. Discontinue anticholinergic agents at least 5 half-lives prior to administration of secretin. Risk D: Consider therapy modification
Serotonergic Agents (High Risk): May enhance the adverse/toxic effect of Antipsychotic Agents. Specifically, serotonergic agents may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotic Agents may enhance the serotonergic effect of Serotonergic Agents (High Risk). This could result in serotonin syndrome. Risk C: Monitor therapy
Sertindole: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Sertindole. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Sodium Phosphates: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Sodium Phosphates. Specifically, the risk of seizure or loss of consciousness may be increased in patients with significant sodium phosphate-induced fluid or electrolyte abnormalities. Risk C: Monitor therapy
Sulpiride: Antipsychotic Agents may enhance the adverse/toxic effect of Sulpiride. Risk X: Avoid combination
Suvorexant: CNS Depressants may enhance the CNS depressant effect of Suvorexant. Management: Dose reduction of suvorexant and/or any other CNS depressant may be necessary. Use of suvorexant with alcohol is not recommended, and the use of suvorexant with any other drug to treat insomnia is not recommended. Risk D: Consider therapy modification
Tetrabenazine: May enhance the adverse/toxic effect of Antipsychotic Agents. Specifically, the risk for NMS and extrapyramidal symptoms may be increased. Risk C: Monitor therapy
Thalidomide: CNS Depressants may enhance the CNS depressant effect of Thalidomide. Risk X: Avoid combination
Thiazide and Thiazide-Like Diuretics: Anticholinergic Agents may increase the serum concentration of Thiazide and Thiazide-Like Diuretics. Risk C: Monitor therapy
Thioridazine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Thioridazine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Thiothixene: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Thiothixene. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Tiotropium: Anticholinergic Agents may enhance the anticholinergic effect of Tiotropium. Risk X: Avoid combination
Topiramate: Anticholinergic Agents may enhance the adverse/toxic effect of Topiramate. Risk C: Monitor therapy
Trifluoperazine: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Trifluoperazine. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Trimeprazine: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Triptorelin: Hyperprolactinemic Agents may diminish the therapeutic effect of Triptorelin. Risk X: Avoid combination
Umeclidinium: May enhance the anticholinergic effect of Anticholinergic Agents. Risk X: Avoid combination
Valerian: May enhance the CNS depressant effect of CNS Depressants. Risk C: Monitor therapy
Ziprasidone: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Ziprasidone. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Zolpidem: CNS Depressants may enhance the CNS depressant effect of Zolpidem. Management: Reduce the Intermezzo brand sublingual zolpidem adult dose to 1.75 mg for men who are also receiving other CNS depressants. No such dose change is recommended for women. Avoid use with other CNS depressants at bedtime; avoid use with alcohol. Risk D: Consider therapy modification
Zuclopenthixol: Agents With Seizure Threshold Lowering Potential may enhance the adverse/toxic effect of Zuclopenthixol. Specifically, the risk of seizures may be increased. Risk C: Monitor therapy
Zuranolone: May enhance the CNS depressant effect of CNS Depressants. Management: Consider alternatives to the use of zuranolone with other CNS depressants or alcohol. If combined, consider a zuranolone dose reduction and monitor patients closely for increased CNS depressant effects. Risk D: Consider therapy modification
Antipsychotic use during the third trimester of pregnancy has a risk for abnormal muscle movements (extrapyramidal symptoms [EPS]) and withdrawal symptoms in newborns following delivery. Symptoms in the newborn may include agitation, feeding disorder, hypertonia, hypotonia, respiratory distress, somnolence, and tremor; these effects may be self-limiting or require hospitalization.
Data collection to monitor pregnancy and infant outcomes following exposure to loxapine is ongoing. Health care providers are encouraged to enroll patients exposed to loxapine during pregnancy in the National Pregnancy Registry for Atypical Antipsychotics (866-961-2388 or http://womensmentalhealth.org/clinical-and-researchprograms/pregnancyregistry/).
It is not known if loxapine is present in breast milk.
According to the manufacturer, the decision to breastfeed during therapy should consider the risk of infant exposure, the benefits of breastfeeding to the infant, and the benefits of treatment to the mother.
Mental status; vital signs (as clinically indicated); weight, height, BMI, waist circumference (baseline; at every visit for the first 6 months; quarterly with stable antipsychotic dose); CBC (as clinically indicated; monitor frequently during the first few months of therapy in patients with pre-existing low WBC or history of drug-induced leukopenia/neutropenia); electrolytes and liver function (annually and as clinically indicated); fasting plasma glucose level/HbA1c (baseline, then yearly; in patients with diabetes risk factors or if gaining weight repeat 4 months after starting antipsychotic, then yearly); fasting lipid panel (baseline; repeat every 2 years if LDL level is normal; repeat every 6 months if LDL level is >130 mg/dL); changes in menstruation, libido, development of galactorrhea, erectile and ejaculatory function (yearly); abnormal involuntary movements or parkinsonian signs (baseline; repeat weekly until dose stabilized for at least 2 weeks after introduction and for 2 weeks after any significant dose increase); tardive dyskinesia (every 6 months; high-risk patients every 3 months); visual changes (inquire yearly); ocular examination (yearly in patients >40 years; every 2 years in younger patients) (ADA 2004; Lehman 2004; Marder 2004); fall risk (baseline and periodically during treatment in patients with diseases or on medications that may also increase fall risk).
Inhaler: Monitor for signs and symptoms of bronchospasm for at least 1 hour after administration.
Timing of serum samples: Draw trough just before next dose (Hiemke 2018).
Therapeutic reference range: 5 to 10 ng/mL (SI: 15.25 to 30.5 nmol/L) (Hiemke 2018). Note: Dosing should be based on therapeutic response as opposed to serum concentrations; however, therapeutic drug monitoring can be used to confirm adherence (APA [Keepers 2020]).
Laboratory alert level: 20 ng/mL (SI: 61 nmol/L) (Hiemke 2018).
Loxapine is a dibenzoxazepine antipsychotic that blocks postsynaptic mesolimbic D1 and D2 receptors in the brain, and also possesses serotonin 5-HT2-blocking activity.
Onset of action:
Agitation:
Inhalation: Initial effects within 10 minutes (Citrome 2012)
Oral, IM [Canadian product]: Within 30 minutes; Peak effect: 1.5 to 3 hours
Schizophrenia: Oral: Initial effects may be observed within 1 to 2 weeks of treatment with continued improvements through 4 to 6 weeks (Agid 2003; Levine 2010).
Duration: Oral, IM: ~12 hours
Absorption: Oral, inhalation, IM: Rapid and complete
Protein binding: Inhalation: ~97%
Metabolism: Hepatic to glucuronide conjugates
Bioavailability: Inhalation: 91% (de Berardis 2017)
Half-life elimination: Oral: Biphasic: Initial: 5 hours; Terminal: 19 hours; Inhalation: 6 to 8 hours
Excretion: Urine (as metabolites); feces (as metabolites)
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