Version May 2024
Helicobacter pylori eradication: Note: Avoid use of clarithromycin triple therapy in patients with risk factors for macrolide resistance (eg, prior macrolide exposure, local clarithromycin resistance rates ≥15%, eradication rates with clarithromycin-based regimens ≤85%) (ACG [Chey 2017]; Fallone 2016).
Oral: Omeprazole 20 mg (one capsule), clarithromycin 500 mg (one tablet), and amoxicillin 1,000 mg (two capsules) administered together twice daily for 10 days (manufacturer labeling). Note: Current guidelines recommend treatment for 14 days to improve chances of eradication (ACG [Chey 2017]; Yuan 2013). If patient has an active duodenal ulcer at therapy initiation, an additional 18 days of omeprazole 20 mg once daily is recommended.
Dosage adjustment for concomitant therapy: Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.
There are no specific dosage recommendations in the manufacturer's labeling. Amoxicillin and clarithromycin pharmacokinetics are altered in renal impairment; prolonged dosing intervals for clarithromycin may be appropriate in severe renal impairment, but no recommendations are available in regard to amoxicillin.
The manufacturer recommends avoiding use in patients with hepatic impairment; however, this combination has been used successfully in patients with cirrhosis (Demirtürk 2001; Tsai 2016). H. pylori may play a role in cirrhosis-related complications (eg, encephalopathy) and eradication should be considered (Abdel-Razik 2020; Chang 2015; Schulz 2014).
Refer to adult dosing.
The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified. Also see individual agents.
>10%: Gastrointestinal: Diarrhea (14%)
1% to 10%:
Gastrointestinal: Dysgeusia (10%)
Nervous system: Headache (7%)
Postmarketing: Hepatic: Hepatotoxicity (idiosyncratic) (Chalasani 2021)
Hypersensitivity (eg, anaphylaxis, anaphylactic shock, angioedema, bronchospasm, acute tubulointerstitial nephritis, rash, serum-sickness like reactions, urticaria) to amoxicillin or any penicillins, clarithromycin or any macrolide antibiotics, omeprazole, or any component of the formulation; concurrent use with ergotamine, dihydroergotamine, and pimozide
Significant drug interactions exist, requiring dose/frequency adjustment or avoidance. Consult drug interactions database for more information.
Concerns related to adverse effects:
• Altered cardiac conduction: Macrolides have been associated with rare QTc prolongation and ventricular arrhythmias, including torsades de pointes; use with caution in patients at risk of prolonged cardiac repolarization; avoid use in patients with uncorrected hypokalemia or hypomagnesemia, clinically significant bradycardia, and patients receiving Class IA (eg, quinidine, procainamide) or Class III (eg, amiodarone, dofetilide, sotalol) antiarrhythmic agents.
• Anaphylactoid/hypersensitivity reactions: Serious and occasionally severe or fatal hypersensitivity (anaphylactoid) reactions have been reported in patients on penicillin therapy, especially with a history of beta-lactam hypersensitivity, history of sensitivity to multiple allergens, or previous IgE-mediated reactions (eg, anaphylaxis, angioedema, urticaria). Use with caution in asthmatic patients. Severe acute reactions have (rarely) been reported with clarithromycin, including anaphylaxis, Stevens-Johnson syndrome, toxic epidermal necrolysis, drug rash with eosinophilia and systemic symptoms (DRESS), and Henoch-Schönlein purpura (IgA vasculitis); discontinue therapy immediately and urgently initiate treatment.
• Carcinoma: In long-term (2-year) studies in rats, omeprazole produced a dose-related increase in gastric carcinoid tumors. While available endoscopic evaluations and histologic examinations of biopsy specimens from human stomachs have not detected a risk from short-term exposure to omeprazole, further human data on the effect of sustained hypochlorhydria and hypergastrinemia are needed to rule out the possibility of an increased risk for the development of tumors in humans receiving long-term therapy.
• Clostridioides difficile-associated diarrhea (CDAD): Use of proton pump inhibitors (PPIs) may increase risk of CDAD, especially in hospitalized patients; consider CDAD diagnosis in patients with persistent diarrhea that does not improve. Use the lowest dose and shortest duration of PPI therapy appropriate for the condition being treated.
• Cutaneous and systemic lupus erythematosus: Has been reported as new onset or exacerbation of existing autoimmune disease; most cases were cutaneous lupus erythematosus (CLE), most commonly, subacute CLE (occurring within weeks to years after continuous therapy). Systemic lupus erythematosus (SLE) is less common (typically occurs within days to years after initiating treatment) and occurred primarily in young adults up to elderly patients. Discontinue therapy if signs or symptoms of CLE or SLE occur and refer to specialist for evaluation; most patients improve 4 to 12 weeks after discontinuation of omeprazole.
• Dermatologic reactions: Severe cutaneous adverse reactions, including acute generalized exanthematous pustulosis, drug reaction with eosinophilia and systemic symptoms, Stevens-Johnson syndrome, and toxic epidermal necrolysis, have been reported.
• Fractures: Increased incidence of osteoporosis-related bone fractures of the hip, spine, or wrist may occur with PPI therapy. Use the lowest effective dose for the shortest duration of time, use vitamin D and calcium supplementation, and follow appropriate guidelines to reduce risk of fractures in patients at risk.
• Hypomagnesemia: Reported rarely, usually with prolonged PPI use of ≥3 months (most cases >1 year of therapy). May be symptomatic or asymptomatic; severe cases may cause tetany, seizures, and cardiac arrhythmias. Hypomagnesemia may lead to or exacerbate hypocalcemia in patients at risk (eg, hypoparathyroidism). Hypomagnesemia may also lead to hypokalemia.
• Superinfection: Prolonged use of amoxicillin or clarithromycin may result in fungal or bacterial superinfection, including C. difficile-associated diarrhea (CDAD) and pseudomembranous colitis; CDAD has been observed >2 months postantibiotic treatment.
• Tubulointerstitial nephritis: Acute tubulointerstitial nephritis has been observed in patients taking PPIs; may occur at any time during therapy. Patients may present with symptomatic hypersensitivity reaction to nonspecific symptoms of impaired renal function (eg, anorexia, malaise, nausea); may be diagnosed with biopsy and in the absence of extra-renal manifestations (eg, fever, rash, arthralgia). Discontinue and evaluate patients if acute tubulointerstitial nephritis is suspected.
• Vitamin B12 deficiency: Prolonged treatment (>3 years) of PPIs may lead to vitamin B12 malabsorption and subsequent vitamin B12 deficiency. The magnitude of the deficiency is dose-related and the association is stronger in females and those younger in age (<30 years); prevalence is decreased after discontinuation of therapy (Lam 2013).
Disease-related concerns:
• Coronary artery disease (CAD): Use clarithromycin with caution in patients with CAD; postmarketing safety trial suggests increased risk of cardiovascular mortality with short-term clarithromycin use (vs placebo) in patients with stable CAD. However, more smokers were randomized to the clarithromycin arm (Jespersen 2006).
• Gastric malignancy: Relief of symptoms does not preclude the presence of a gastric malignancy.
• Gastrointestinal infection (eg, Salmonella, Campylobacter): Use of PPIs may increase risk of these infections.
• Infectious mononucleosis: A high percentage of patients with infectious mononucleosis have developed rash during amoxicillin therapy; ampicillin-class antibiotics not recommended in these patients.
• Hepatic impairment: The manufacturer suggests avoiding use in patients with hepatic impairment secondary to increased bioavailability of omeprazole.
• Myasthenia gravis: Use clarithromycin with caution in patients with myasthenia gravis; exacerbation of symptoms and new onset of symptoms has occurred.
• Renal impairment: Use caution in patients with renal impairment; pharmacokinetics of amoxicillin and clarithromycin are altered in renal impairment; prolonged clarithromycin dosing intervals may be recommended in severe renal impairment.
Concurrent drug therapy issues:
• Clopidogrel: PPIs may diminish the therapeutic effect of clopidogrel, thought to be due to reduced formation of the active metabolite of clopidogrel. The manufacturer of clopidogrel recommends either avoidance of both omeprazole (even when scheduled 12 hours apart) and esomeprazole or use of a PPI with comparatively less effect on the active metabolite of clopidogrel (eg, pantoprazole). In contrast to these warnings, others have recommended the continued use of PPIs, regardless of the degree of inhibition, in patients with a history of GI bleeding or multiple risk factors for GI bleeding who are also receiving clopidogrel since no evidence has established clinically meaningful differences in outcome; however, a clinically significant interaction cannot be excluded in those who are poor metabolizers of clopidogrel (Abraham 2010; Levine 2011).
Special populations:
• Asian ethnicity: Bioavailability of omeprazole may be increased in patients of Asian descent; avoid use unless benefit outweighs the risk.
• Older adult: Use of clarithromycin may increase risk of torsades de pointes, particularly with concurrent renal/hepatic impairment. Bioavailability of omeprazole may be increased in older adult patients.
Other warnings/precautions:
• Appropriate use: Helicobacter pylori eradication: Short-term combination therapy (≤7 days) has been associated with a higher incidence of treatment failure. The American College of Gastroenterology recommends 14 days of triple therapy for eradication of H. pylori (ACG [Chey 2017]).
• Clarithromycin resistance: If H. pylori is not eradicated following amoxicillin, clarithromycin, and omeprazole triple therapy, then clarithromycin resistant H. pylori isolates are likely; susceptibility testing should be done (if possible) and alternative regimens (not including clarithromycin) should be prescribed.
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Combination package, oral [each administration card contains]:
Omeclamox-Pak:
Capsule, delayed release: Omeprazole: 20 mg (2s)
Tablet: Clarithromycin: 500 mg (2s)
Capsule: Amoxicillin: 500 mg (4s) [contains sodium ≤0.0052 mEq (0.119 mg)/capsule]
No
Misc (Omeclamox-Pak Oral)
500-500-20 mg (per each): $11.53
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Administer before morning and evening meal. Swallow capsules and tablets whole; do not crush or chew.
Helicobacter pylori eradication: Eradication of H. pylori infection to reduce the risk of recurrent duodenal ulcer in adults with active or 1-year history of duodenal ulcer
Beers Criteria: Omeprazole is identified in the Beers Criteria as a potentially inappropriate medication to be avoided (as scheduled use for >8 weeks) in patients 65 years and older due to its risk of C. difficile infection, pneumonia, GI malignancies, and bone loss/fractures unless given for high-risk patients (eg, oral corticosteroid or chronic NSAID use), patients with erosive esophagitis, Barrett’s esophagitis, a pathological hypersecretory condition, or if the patient has demonstrated a need for maintenance therapy (eg, failure of drug discontinuation trial or failure of H2 blockers) (Beers Criteria [AGS 2023]).
Refer to individual components.
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.
Abemaciclib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Abemaciclib. Management: In patients taking abemaciclib at a dose of 200 mg or 150 mg twice daily, reduce the dose to 100 mg twice daily when combined with strong CYP3A4 inhibitors. In patients taking abemaciclib 100 mg twice daily, decrease the dose to 50 mg twice daily. Risk D: Consider therapy modification
Acalabrutinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Acalabrutinib. Risk X: Avoid combination
Acalabrutinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Acalabrutinib. This interaction is only applicable to acalabrutinib capsules. Risk X: Avoid combination
Acemetacin: May increase the serum concentration of Penicillins. Risk C: Monitor therapy
Ado-Trastuzumab Emtansine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Ado-Trastuzumab Emtansine. Specifically, strong CYP3A4 inhibitors may increase concentrations of the cytotoxic DM1 component. Management: Avoid concomitant use of ado-trastuzumab emtansine and strong CYP3A4 inhibitors when possible. Consider alternatives that do not inhibit CYP3A4 or consider administering after CYP3A4 inhibitor discontinuation. Monitor for toxicities if combined. Risk D: Consider therapy modification
Afatinib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Afatinib. Management: If combined, administer the P-gp inhibitor simultaneously with, or after, the dose of afatinib. Monitor closely for signs and symptoms of afatinib toxicity and if the combination is not tolerated, reduce the afatinib dose by 10 mg. Risk D: Consider therapy modification
ALfentanil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of ALfentanil. Management: If use of alfentanil and strong CYP3A4 inhibitors is necessary, consider dosage reduction of alfentanil until stable drug effects are achieved. Frequently monitor patients for respiratory depression and sedation when these agents are combined. Risk D: Consider therapy modification
Alfuzosin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Alfuzosin. Risk X: Avoid combination
Aliskiren: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Aliskiren. Risk C: Monitor therapy
Alitretinoin (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Alitretinoin (Systemic). Management: Consider reducing the alitretinoin dose to 10 mg when used together with strong CYP3A4 inhibitors. Monitor for increased alitretinoin effects/toxicities if combined with a strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Allopurinol: May enhance the potential for allergic or hypersensitivity reactions to Amoxicillin. Risk C: Monitor therapy
Almotriptan: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Almotriptan. Management: Limit initial almotriptan dose to 6.25 mg and maximum dose to 12.5 mg in any 24-period when used with a strong CYP3A4 inhibitor. Avoid concurrent use in patients with impaired hepatic or renal function. Risk D: Consider therapy modification
Alosetron: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Alosetron. Risk C: Monitor therapy
ALPRAZolam: CYP3A4 Inhibitors (Strong) may increase the serum concentration of ALPRAZolam. Risk X: Avoid combination
Aminoglycosides: Penicillins may decrease the serum concentration of Aminoglycosides. Primarily associated with extended spectrum penicillins, and patients with renal dysfunction. Risk C: Monitor therapy
Amisulpride (Oral): May enhance the QTc-prolonging effect of QT-prolonging Agents (Moderate Risk). Risk C: Monitor therapy
AmLODIPine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of AmLODIPine. Risk C: Monitor therapy
Amphetamine: Inhibitors of the Proton Pump (PPIs and PCABs) may increase the absorption of Amphetamine. Risk C: Monitor therapy
Antihepaciviral Combination Products: May increase the serum concentration of Clarithromycin. Management: Avoid clarithromycin doses greater than 1,000 mg/day when used with an antihepaciviral combination product. Further dose reductions may be needed in patients with impaired renal function. Consider an alternative antimicrobial for any non-MAC infection. Risk D: Consider therapy modification
Apixaban: Clarithromycin may increase the serum concentration of Apixaban. Risk C: Monitor therapy
Aprepitant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Aprepitant. Risk X: Avoid combination
ARIPiprazole: CYP3A4 Inhibitors (Strong) may increase the serum concentration of ARIPiprazole. Management: Aripiprazole dose reductions are required for indications other than major depressive disorder. Dose reductions vary based on formulation, initial starting dose, CYP2D6 genotype, and use of CYP2D6 inhibitors. See full interaction monograph for details. Risk D: Consider therapy modification
ARIPiprazole Lauroxil: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of ARIPiprazole Lauroxil. Management: Decrease aripiprazole lauroxil dose to next lower strength if used with strong CYP3A4 inhibitors for over 14 days. No dose adjustment needed if using the lowest dose (441 mg). Max dose is 441 mg in CYP2D6 PMs or if also taking strong CYP2D6 inhibitors. Risk D: Consider therapy modification
Artemether and Lumefantrine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Artemether and Lumefantrine. Specifically, concentrations of dihydroartemisinin (DHA), the active metabolite of artemether may be increased. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Artemether and Lumefantrine. Risk C: Monitor therapy
Asciminib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Asciminib. Risk C: Monitor therapy
Astemizole: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Astemizole. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Astemizole. Risk X: Avoid combination
Asunaprevir: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Asunaprevir. Risk X: Avoid combination
Asunaprevir: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Asunaprevir. Risk X: Avoid combination
Atazanavir: May decrease serum concentrations of the active metabolite(s) of Clarithromycin. Atazanavir may increase the serum concentration of Clarithromycin. Clarithromycin may increase the serum concentration of Atazanavir. Management: Decrease clarithromycin dose 50% and do not exceed 1,000 mg per day. Decrease clarithromycin dose 75% in patients with CrCL less than 30 mL/min. Use alternative antimicrobial therapy if treating infections other than Mycobacterium avium complex. Risk D: Consider therapy modification
Atogepant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Atogepant. Management: For treatment of episodic migraine, the recommended atogepant dose is 10 mg once daily with a concurrent strong CYP3A4 inhibitor. If used for treatment of chronic migraine, concurrent use of atogepant with strong CYP3A4 inhibitors should be avoided. Risk D: Consider therapy modification
Atogepant: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Atogepant. Management: For episodic migraine, the recommended atogepant dose is 10 mg or 30 mg once daily if given with OATP1B1/1B3 inhibitors. For chronic migraine, the recommended atogepant dose is 30 mg once daily with OATP1B1/1B3 inhibitors. Risk D: Consider therapy modification
Atorvastatin: Clarithromycin may increase the serum concentration of Atorvastatin. Management: Limit atorvastatin to a maximum dose of 20 mg/day when used with clarithromycin. If this combination is used, monitor patients more closely for evidence of atorvastatin toxicity. Risk D: Consider therapy modification
Avacopan: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Avacopan. Management: Decrease the avacopan dose to 30 mg once daily during coadministration with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Avanafil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Avanafil. Risk X: Avoid combination
Avapritinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Avapritinib. Risk X: Avoid combination
Axitinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Axitinib. Management: Avoid concurrent use of axitinib with any strong CYP3A inhibitor whenever possible. If a strong CYP3A inhibitor must be used with axitinib, a 50% axitinib dose reduction is recommended. Risk D: Consider therapy modification
Bacillus clausii: Antibiotics may diminish the therapeutic effect of Bacillus clausii. Management: Bacillus clausii should be taken in between antibiotic doses during concomitant therapy. Risk D: Consider therapy modification
Barnidipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Barnidipine. Risk X: Avoid combination
BCG (Intravesical): Antibiotics may diminish the therapeutic effect of BCG (Intravesical). Risk X: Avoid combination
BCG Vaccine (Immunization): Antibiotics may diminish the therapeutic effect of BCG Vaccine (Immunization). Risk C: Monitor therapy
Beclomethasone (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Beclomethasone (Systemic). Risk C: Monitor therapy
Belumosudil: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Belumosudil. Management: Increase the dose of belumosudil to 200 mg twice daily when coadministered with inhibitors of the proton pump (PPIs and PCABs). Risk D: Consider therapy modification
Benidipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Benidipine. Risk C: Monitor therapy
Benperidol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Benperidol. Risk C: Monitor therapy
Benzhydrocodone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Benzhydrocodone. Specifically, the concentration of hydrocodone may be increased. Risk C: Monitor therapy
Berotralstat: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Berotralstat. Management: Decrease the berotralstat dose to 110 mg daily when combined with P-glycoprotein (P-gp) inhibitors. Risk D: Consider therapy modification
Betamethasone (Nasal): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Betamethasone (Nasal). Risk C: Monitor therapy
Betamethasone (Ophthalmic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Betamethasone (Ophthalmic). Risk C: Monitor therapy
Betamethasone (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Betamethasone (Systemic). Risk C: Monitor therapy
Betamethasone (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Betamethasone (Topical). Risk C: Monitor therapy
Bilastine: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Bilastine. Risk X: Avoid combination
Bisphosphonate Derivatives: Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the therapeutic effect of Bisphosphonate Derivatives. Risk C: Monitor therapy
Blonanserin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Blonanserin. Risk X: Avoid combination
Bortezomib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Bortezomib. Risk C: Monitor therapy
Bosentan: May increase serum concentrations of the active metabolite(s) of Clarithromycin. Specifically, bosentan may increase concentrations of 14-hydroxyclarithromycin. Bosentan may decrease the serum concentration of Clarithromycin. Clarithromycin may increase the serum concentration of Bosentan. Management: Consider alternative antimicrobial if possible. The clinical activity of clarithromycin may be altered, and increased bosentan toxicity may be expected. Risk D: Consider therapy modification
Bosutinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Bosutinib. Risk X: Avoid combination
Brentuximab Vedotin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Brentuximab Vedotin. Specifically, concentrations of the active monomethyl auristatin E (MMAE) component may be increased. Risk C: Monitor therapy
Brexpiprazole: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Brexpiprazole. Management: Reduce brexpiprazole dose 50% with strong CYP3A4 inhibitors; reduce to 25% of usual if used with both a strong CYP3A4 inhibitor and a CYP2D6 inhibitor in patients not being treated for MDD, or strong CYP3A4 inhibitor used in a CYP2D6 poor metabolizer. Risk D: Consider therapy modification
Brigatinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Brigatinib. Management: Avoid concurrent use of brigatinib with strong CYP3A4 inhibitors when possible. If combination cannot be avoided, reduce the brigatinib dose by approximately 50%, rounding to the nearest tablet strength (ie, from 180 mg to 90 mg, or from 90 mg to 60 mg). Risk D: Consider therapy modification
Brincidofovir: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Brincidofovir. Management: Consider alternatives to OATP1B/1B3 inhibitors in patients treated with brincidofovir. If coadministration is required, administer OATP1B1/1B3 inhibitors at least 3 hours after brincidofovir and increase monitoring for brincidofovir adverse reactions. Risk D: Consider therapy modification
Bromocriptine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Bromocriptine. Management: Consider alternatives to the use of bromocriptine with strong CYP3A4 inhibitors. If combined, monitor closely for increased bromocriptine toxicities and consider bromocriptine dose reductions. Risk D: Consider therapy modification
Bromperidol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Bromperidol. Risk C: Monitor therapy
Brotizolam: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Brotizolam. Risk C: Monitor therapy
Budesonide (Nasal): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Budesonide (Nasal). Risk C: Monitor therapy
Budesonide (Oral Inhalation): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Budesonide (Oral Inhalation). Management: Consider alternatives to this combination when possible. If combined, monitor for increased corticosteroid adverse effects during coadministration of inhaled budesonide and strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Budesonide (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Budesonide (Systemic). Management: Avoid the concomitant use of CYP3A4 inhibitors and oral budesonide. If patients receive both budesonide and a strong CYP3A4 inhibitor, they should be closely monitored for signs and symptoms of corticosteroid excess. Risk D: Consider therapy modification
Budesonide (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Budesonide (Topical). Risk X: Avoid combination
Buprenorphine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Buprenorphine. Risk C: Monitor therapy
BusPIRone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of BusPIRone. Management: Limit the buspirone dose to 2.5 mg daily and monitor patients for increased buspirone effects/toxicities if combined with strong CYP3A4 inhibitors. Dose adjustments of buspirone or a strong CYP3A4 inhibitor should be based on clinical assessment. Risk D: Consider therapy modification
Butorphanol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Butorphanol. Risk C: Monitor therapy
Cabazitaxel: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cabazitaxel. Management: Concurrent use of cabazitaxel with strong inhibitors of CYP3A4 should be avoided when possible. If such a combination must be used, consider a 25% reduction in the cabazitaxel dose. Risk D: Consider therapy modification
Cabergoline: Clarithromycin may increase the serum concentration of Cabergoline. Risk C: Monitor therapy
Cabozantinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cabozantinib. Management: Avoid use of a strong CYP3A4 inhibitor with cabozantinib if possible. If combined, decrease cabozantinib capsules (Cometriq) by 40 mg from previous dose or decrease cabozantinib tablets (Cabometyx) by 20 mg from previous dose. Risk D: Consider therapy modification
Calcifediol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Calcifediol. Risk C: Monitor therapy
Calcitriol (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Calcitriol (Systemic). Risk C: Monitor therapy
Cannabidiol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cannabidiol. Risk C: Monitor therapy
Cannabis: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cannabis. More specifically, tetrahydrocannabinol and cannabidiol serum concentrations may be increased. Risk C: Monitor therapy
Capecitabine: Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the therapeutic effect of Capecitabine. Risk C: Monitor therapy
Capivasertib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Capivasertib. Management: Avoid concomitant use of capivasertib with strong CYP3A4 inhibitors when possible. If combined, reduce the capivasertib dose to 320 mg twice daily for 4 days, followed by 3 days off. Monitor patients closely for adverse reactions. Risk D: Consider therapy modification
Capmatinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Capmatinib. Risk C: Monitor therapy
CarBAMazepine: May increase serum concentrations of the active metabolite(s) of Clarithromycin. Clarithromycin may increase the serum concentration of CarBAMazepine. CarBAMazepine may decrease the serum concentration of Clarithromycin. Management: Consider alternatives to this combination when possible. If combined, monitor for increased carbamazepine effects/toxicities and for reduced clarithromycin efficacy. Risk D: Consider therapy modification
Cardiac Glycosides: Macrolide Antibiotics may increase the serum concentration of Cardiac Glycosides. Risk C: Monitor therapy
Cariprazine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Cariprazine. Specifically, concentrations of didesmethylcariprazine (DDCAR), the primary active metabolite of cariprazine, may increase. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cariprazine. Management: Decrease cariprazine dose 50% (4.5 mg to 1.5 mg or 3 mg; 1.5 mg to 1.5 mg every other day) if starting a strong CYP3A4 inhibitor. If on a strong CYP3A4 inhibitor, start cariprazine at 1.5 mg day 1, 0 mg day 2, then 1.5 mg daily. May increase to 3 mg daily Risk D: Consider therapy modification
Cefditoren: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Cefditoren. Risk X: Avoid combination
Cefpodoxime: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Cefpodoxime. Risk C: Monitor therapy
Cefuroxime: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the absorption of Cefuroxime. Risk X: Avoid combination
Celiprolol: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Celiprolol. Risk C: Monitor therapy
Ceritinib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Ceritinib. Management: Avoid use of ceritinib and strong CYP3A4 inhibitors that prolong the QTc interval whenever possible. If combined, decrease ceritinib dose by one-third (to the nearest 150 mg) and monitor patients for ceritinib toxicities including QTc prolongation. Risk D: Consider therapy modification
ChlordiazePOXIDE: CYP3A4 Inhibitors (Strong) may increase the serum concentration of ChlordiazePOXIDE. Risk C: Monitor therapy
Cholera Vaccine: Antibiotics may diminish the therapeutic effect of Cholera Vaccine. Management: Avoid cholera vaccine in patients receiving systemic antibiotics, and within 14 days following the use of oral or parenteral antibiotics. Risk X: Avoid combination
Ciclesonide (Oral Inhalation): CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Ciclesonide (Oral Inhalation). Risk C: Monitor therapy
Cilnidipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cilnidipine. Risk C: Monitor therapy
Cilostazol: Omeprazole may increase serum concentrations of the active metabolite(s) of Cilostazol. Omeprazole may increase the serum concentration of Cilostazol. Management: Reduce the cilostazol dose to 50 mg twice daily in patients who are also receiving omeprazole. Monitor clinical response to cilostazol closely. Risk D: Consider therapy modification
Cinacalcet: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cinacalcet. Risk C: Monitor therapy
Cisapride: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Cisapride. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Cisapride. Risk X: Avoid combination
Citalopram: Omeprazole may increase the serum concentration of Citalopram. Management: Limit citalopram dose to a maximum of 20 mg/day if used with omeprazole. Monitor for evidence of citalopram toxicity (eg, serotonin syndrome, QT prolongation) in patients receiving this combination. Risk D: Consider therapy modification
Clindamycin (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Clindamycin (Systemic). Risk C: Monitor therapy
CloBAZam: CYP2C19 Inhibitors (Weak) may increase serum concentrations of the active metabolite(s) of CloBAZam. CYP2C19 Inhibitors (Weak) may increase the serum concentration of CloBAZam. Risk C: Monitor therapy
Clofarabine: OAT1/3 Inhibitors may increase the serum concentration of Clofarabine. Risk C: Monitor therapy
Clofazimine: May increase the serum concentration of CYP3A4 Substrates (High risk with Inhibitors). Risk C: Monitor therapy
ClonazePAM: CYP3A4 Inhibitors (Strong) may increase the serum concentration of ClonazePAM. Risk C: Monitor therapy
Clopidogrel: Omeprazole may diminish the antiplatelet effect of Clopidogrel. Omeprazole may decrease serum concentrations of the active metabolite(s) of Clopidogrel. Risk X: Avoid combination
CloZAPine: Omeprazole may decrease the serum concentration of CloZAPine. Omeprazole may increase the serum concentration of CloZAPine. Risk C: Monitor therapy
Cobicistat: May decrease serum concentrations of the active metabolite(s) of Clarithromycin. Cobicistat may increase the serum concentration of Clarithromycin. Management: Consider alternative antibiotics. Reduce clarithromycin dose by 50% in patients receiving elvitegravir/cobicistat/emtricitabine/tenofovir with estimated creatinine clearance 50 to 60 mL/min. Closely monitor for clarithromycin toxicity. Risk D: Consider therapy modification
Cobimetinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cobimetinib. Risk X: Avoid combination
Codeine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Codeine. Risk C: Monitor therapy
Colchicine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Colchicine. Management: This combination is often contraindicated, but combined use may be permitted with dose adjustment and monitoring. Recommendations vary based on brand, indication, use of P-gp inhibitors, and hepatic/renal function. See interaction monograph for details Risk D: Consider therapy modification
Colchicine: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Colchicine. Colchicine distribution into certain tissues (e.g., brain) may also be increased. Management: This combination is often contraindicated, but combined use may be permitted with dose adjustment and monitoring. Recommendations vary based on brand, indication, use of CYP3A4 inhibitors, and hepatic/renal function. See interaction monograph for details. Risk D: Consider therapy modification
Conivaptan: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Conivaptan. Risk X: Avoid combination
Copanlisib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Copanlisib. Management: If concomitant use of copanlisib and strong CYP3A4 inhibitors cannot be avoided, reduce the copanlisib dose to 45 mg. Monitor patients for increased copanlisib effects/toxicities. Risk D: Consider therapy modification
Cortisone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cortisone. Risk C: Monitor therapy
Crizotinib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Crizotinib. Management: Avoid concomitant use of crizotinib and strong CYP3A4 inhibitors that prolong the QTc interval whenever possible. If combined, crizotinib dose adjustments are required, which vary according to indication. See full interaction monograph for details. Risk D: Consider therapy modification
CycloSPORINE (Systemic): Clarithromycin may increase the serum concentration of CycloSPORINE (Systemic). Management: Monitor for increased serum concentrations/toxic effects of cyclosporine if combined with clarithromycin. Cyclosporine dose reductions and/or prolongation of the dosing interval will likely be required. Risk D: Consider therapy modification
CYP2C19 Inducers (Moderate): May decrease the serum concentration of Omeprazole. Risk C: Monitor therapy
CYP2C19 Inducers (Strong): May decrease the serum concentration of Omeprazole. Risk X: Avoid combination
CYP2C19 Inhibitors (Moderate): May increase the serum concentration of Omeprazole. Risk C: Monitor therapy
CYP2C19 Inhibitors (Strong): May increase the serum concentration of Omeprazole. Risk C: Monitor therapy
CYP3A4 Inducers (Moderate): May increase serum concentrations of the active metabolite(s) of Clarithromycin. CYP3A4 Inducers (Moderate) may decrease the serum concentration of Clarithromycin. Management: Consider alternative antimicrobial therapy for patients receiving a CYP3A4 inducer. Drugs that enhance the metabolism of clarithromycin into 14-hydroxyclarithromycin may alter the clinical activity of clarithromycin and impair its efficacy. Risk D: Consider therapy modification
CYP3A4 Inducers (Strong): May increase serum concentrations of the active metabolite(s) of Clarithromycin. CYP3A4 Inducers (Strong) may decrease the serum concentration of Clarithromycin. Management: Consider alternative antimicrobial therapy for patients receiving a CYP3A4 inducer. Drugs that enhance the metabolism of clarithromycin into 14-hydroxyclarithromycin may alter the clinical activity of clarithromycin and may impair clarithromycin efficacy. Risk D: Consider therapy modification
CYP3A4 Inhibitors (Strong): May decrease serum concentrations of the active metabolite(s) of Clarithromycin. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Clarithromycin. Risk C: Monitor therapy
Cyproterone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Cyproterone. Risk C: Monitor therapy
Cysteamine (Systemic): Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the therapeutic effect of Cysteamine (Systemic). Risk C: Monitor therapy
Dabigatran Etexilate: P-glycoprotein/ABCB1 Inhibitors may increase serum concentrations of the active metabolite(s) of Dabigatran Etexilate. Risk C: Monitor therapy
Dabrafenib: May enhance the QTc-prolonging effect of Clarithromycin. Dabrafenib may increase serum concentrations of the active metabolite(s) of Clarithromycin. Clarithromycin may increase serum concentrations of the active metabolite(s) of Dabrafenib. Clarithromycin may increase the serum concentration of Dabrafenib. Dabrafenib may increase the serum concentration of Clarithromycin. Management: If coadministration is unavoidable, monitor for decreased clarithromycin efficacy, increased dabrafenib adverse effects, and QTc interval prolongation and ventricular arrhythmias when these agents are combined. Risk D: Consider therapy modification
Daclatasvir: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Daclatasvir. Management: Decrease the daclatasvir dose to 30 mg once daily if combined with a strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Dacomitinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Dacomitinib. Management: Avoid concurrent use of dacomitinib with PPIs and PCABs. Antacids may be used. Histamine H2-receptor antagonists (HR2A) may be used if dacomitinib is given at least 6 hours before or 10 hours after the H2RA. Risk X: Avoid combination
Dapoxetine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Dapoxetine. Risk X: Avoid combination
Daridorexant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Daridorexant. Risk X: Avoid combination
Darifenacin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Darifenacin. Management: Limit the darifenacin dose to no more than 7.5 mg daily if combined with strong CYP3A4 inhibitors. Monitor patients for increased darifenacin toxicities (eg, dry mouth, constipation, headache, CNS effects) when these agents are combined. Risk D: Consider therapy modification
Darolutamide: Inhibitors of CYP3A4 (Strong) and P-glycoprotein may increase the serum concentration of Darolutamide. Risk C: Monitor therapy
Dasatinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Dasatinib. Management: Antacids (taken 2 hours before or after dasatinib administration) can be used in place of PPIs or PCABs if some acid-reducing therapy is needed. Risk X: Avoid combination
Deflazacort: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Deflazacort. Management: Administer one third of the recommended deflazacort dose when used together with a strong or moderate CYP3A4 inhibitor. Risk D: Consider therapy modification
Delavirdine: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Delavirdine. Management: Chronic therapy with PPIs or PCABs should be avoided in patients treated with delavirdine. The clinical significance of short-term PPI or PCAB therapy with delavirdine is uncertain, but such therapy should be undertaken with caution. Risk X: Avoid combination
DexAMETHasone (Ophthalmic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of DexAMETHasone (Ophthalmic). Risk C: Monitor therapy
DexAMETHasone (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of DexAMETHasone (Systemic). Risk C: Monitor therapy
Dextroamphetamine: Inhibitors of the Proton Pump (PPIs and PCABs) may increase the absorption of Dextroamphetamine. Specifically, the dextroamphetamine absorption rate from mixed amphetamine salt extended release (XR) capsules may be increased in the first hours after dosing. Risk C: Monitor therapy
DiazePAM: CYP3A4 Inhibitors (Strong) may increase the serum concentration of DiazePAM. Risk C: Monitor therapy
Dichlorphenamide: Penicillins may enhance the hypokalemic effect of Dichlorphenamide. Risk C: Monitor therapy
Dichlorphenamide: OAT1/3 Inhibitors may increase the serum concentration of Dichlorphenamide. Risk C: Monitor therapy
Dienogest: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Dienogest. Risk C: Monitor therapy
DilTIAZem: CYP3A4 Inhibitors (Strong) may increase the serum concentration of DilTIAZem. Risk C: Monitor therapy
DOCEtaxel: CYP3A4 Inhibitors (Strong) may increase the serum concentration of DOCEtaxel. Management: Avoid the concomitant use of docetaxel and strong CYP3A4 inhibitors when possible. If combined use is unavoidable, consider a 50% docetaxel dose reduction and monitor for increased docetaxel toxicities. Risk D: Consider therapy modification
Domperidone: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Domperidone. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Domperidone. Risk X: Avoid combination
Doxazosin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Doxazosin. Risk C: Monitor therapy
Doxercalciferol: CYP3A4 Inhibitors (Strong) may decrease serum concentrations of the active metabolite(s) of Doxercalciferol. Risk C: Monitor therapy
DOXOrubicin (Conventional): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of DOXOrubicin (Conventional). Risk X: Avoid combination
DOXOrubicin (Liposomal): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of DOXOrubicin (Liposomal). Risk C: Monitor therapy
Doxycycline: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the bioavailability of Doxycycline. Risk C: Monitor therapy
DroNABinol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of DroNABinol. Risk C: Monitor therapy
Dronedarone: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Dronedarone. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Dronedarone. Risk X: Avoid combination
Dutasteride: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Dutasteride. Risk C: Monitor therapy
Duvelisib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Duvelisib. Management: Reduce the dose of duvelisib to 15 mg twice a day when used together with a strong CYP3A4 inhibitor. Monitor closely for evidence of altered response to treatment. Risk D: Consider therapy modification
Dydrogesterone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Dydrogesterone. Risk C: Monitor therapy
Ebastine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Ebastine. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ebastine. Risk C: Monitor therapy
Edoxaban: Clarithromycin may increase the serum concentration of Edoxaban. Management: In patients treated for DVT/PE, reduce edoxaban dose to 30 mg daily when combined with clarithromycin. No dose adjustment is recommended for patients treated for atrial fibrillation. Monitor for increased edoxaban toxicities (ie, bleeding) when combined. Risk D: Consider therapy modification
Efonidipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Efonidipine. Risk C: Monitor therapy
Elacestrant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Elacestrant. Risk X: Avoid combination
Elagolix: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Elagolix. Risk X: Avoid combination
Elagolix, Estradiol, and Norethindrone: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Elagolix, Estradiol, and Norethindrone. Specifically, concentrations of elagolix may be increased. Risk X: Avoid combination
Elagolix, Estradiol, and Norethindrone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Elagolix, Estradiol, and Norethindrone. Elagolix, Estradiol, and Norethindrone may decrease the serum concentration of CYP3A4 Inhibitors (Strong). Specifically, concentrations of strong CYP3A4 inhibitors that are also CYP3A4 substrates may be decreased. Risk X: Avoid combination
Elbasvir and Grazoprevir: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Elbasvir and Grazoprevir. Risk X: Avoid combination
Eletriptan: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Eletriptan. Risk X: Avoid combination
Elexacaftor, Tezacaftor, and Ivacaftor: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Elexacaftor, Tezacaftor, and Ivacaftor. Management: Administer elexacaftor/tezacaftor/ivacaftor in the morning, twice a week, 3 to 4 days apart, with no evening doses of ivacaftor alone. Specific dosing varies by age and weight. See full monograph for details. Risk D: Consider therapy modification
Eliglustat: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Eliglustat. Management: Reduce eliglustat dose to 84 mg daily in CYP2D6 EMs when used with strong CYP3A4 inhibitors. Use of strong CYP3A4 inhibitors is contraindicated in CYP2D6 IMs, PMs, or in CYP2D6 EMs who are also taking strong or moderate CYP2D6 inhibitors. Risk D: Consider therapy modification
Eluxadoline: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Eluxadoline. Management: Decrease the eluxadoline dose to 75 mg twice daily if combined with OATP1B1/1B3 inhibitors and monitor patients for increased eluxadoline effects/toxicities. Risk D: Consider therapy modification
Encorafenib: Clarithromycin may enhance the QTc-prolonging effect of Encorafenib. Encorafenib may increase serum concentrations of the active metabolite(s) of Clarithromycin. Clarithromycin may increase the serum concentration of Encorafenib. Encorafenib may decrease the serum concentration of Clarithromycin. Management: Avoid this combination when possible. If combined, decrease encorafenib from 450 mg to 150 mg; or from 300 mg, 225 mg, or 150 mg to 75 mg. Additionally, monitor for decreased clarithromycin efficacy and for QTc interval prolongation and arrhythmias. Risk D: Consider therapy modification
Enfortumab Vedotin: Inhibitors of CYP3A4 (Strong) and P-glycoprotein may increase the serum concentration of Enfortumab Vedotin. Specifically, concentrations of the active monomethyl auristatin E (MMAE) component may be increased. Risk C: Monitor therapy
Enoxacin: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the absorption of Enoxacin. Risk C: Monitor therapy
Entrectinib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Entrectinib. Risk X: Avoid combination
Eplerenone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Eplerenone. Risk X: Avoid combination
Erdafitinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Erdafitinib. Management: Avoid concomitant use of erdafitinib and strong CYP3A4 inhibitors when possible. If combined, monitor closely for erdafitinib adverse reactions and consider dose modifications accordingly. Risk D: Consider therapy modification
Ergot Derivatives (Vasoconstrictive CYP3A4 Substrates): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ergot Derivatives (Vasoconstrictive CYP3A4 Substrates). Risk X: Avoid combination
Erlotinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Erlotinib. Risk X: Avoid combination
Erythromycin (Systemic): May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Erythromycin (Systemic). Management: Consider alternatives to this drug combination. If combined, monitor for QTc interval prolongation and ventricular arrhythmias. Patients with additional risk factors for QTc prolongation may be at even higher risk. Risk D: Consider therapy modification
Escitalopram: Omeprazole may increase the serum concentration of Escitalopram. Risk C: Monitor therapy
Estrogen Derivatives: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Estrogen Derivatives. Risk C: Monitor therapy
Eszopiclone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Eszopiclone. Management: Limit the eszopiclone dose to 2 mg daily when combined with strong CYP3A4 inhibitors and monitor for increased eszopiclone effects and toxicities (eg, somnolence, drowsiness, CNS depression). Risk D: Consider therapy modification
Etizolam: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Etizolam. Risk C: Monitor therapy
Etoposide: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Etoposide. Risk C: Monitor therapy
Etoposide Phosphate: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Etoposide Phosphate. Risk C: Monitor therapy
Everolimus: Inhibitors of CYP3A4 (Strong) and P-glycoprotein may increase the serum concentration of Everolimus. Risk X: Avoid combination
Evogliptin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Evogliptin. Risk C: Monitor therapy
Fecal Microbiota (Live) (Oral): May diminish the therapeutic effect of Antibiotics. Risk X: Avoid combination
Fecal Microbiota (Live) (Rectal): Antibiotics may diminish the therapeutic effect of Fecal Microbiota (Live) (Rectal). Risk X: Avoid combination
Fedratinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Fedratinib. Management: Consider alternatives when possible. If used together, decrease fedratinib dose to 200 mg/day. After the inhibitor is stopped, increase fedratinib to 300 mg/day for the first 2 weeks and then to 400 mg/day as tolerated. Risk D: Consider therapy modification
Felodipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Felodipine. Management: Consider using lower felodipine doses when combined with strong CYP3A4 inhibitors. Monitor patients for increased felodipine effects and toxicities (eg, hypotension, edema) when combined. Risk D: Consider therapy modification
FentaNYL: CYP3A4 Inhibitors (Strong) may increase the serum concentration of FentaNYL. Management: Consider fentanyl dose reductions when combined with a strong CYP3A4 inhibitor. Monitor for respiratory depression and sedation. Upon discontinuation of a CYP3A4 inhibitor, consider a fentanyl dose increase; monitor for signs and symptoms of withdrawal. Risk D: Consider therapy modification
Fesoterodine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Fesoterodine. Management: Limit fesoterodine doses to 4 mg daily in patients who are also receiving strong CYP3A4 inhibitors. This combination is not recommended in pediatric patients weighing 25 kg up to 35 kg. Risk D: Consider therapy modification
Fexinidazole: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Fexinidazole. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may decrease serum concentrations of the active metabolite(s) of Fexinidazole. Management: Consider alternatives to this combination. If combined, monitor for QT interval prolongation and ventricular arrhythmias. Patients with additional risk factors for QT prolongation may be at even higher risk. Also monitor for reduced fexinidazole efficacy. Risk D: Consider therapy modification
Finerenone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Finerenone. Risk X: Avoid combination
Flibanserin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Flibanserin. Management: Use of flibanserin with strong CYP3A4 inhibitors is contraindicated. If starting flibanserin, start 2 weeks after the last dose of the CYP3A4 inhibitor. If starting a CYP3A4 inhibitor, start 2 days after the last dose of flibanserin. Risk X: Avoid combination
Fluconazole: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate 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 therapy
Flunitrazepam: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Flunitrazepam. Risk C: Monitor therapy
Fluorouracil Products: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Fluorouracil Products. 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 therapy
FLUoxetine: May enhance the QTc-prolonging effect of Clarithromycin. Clarithromycin may increase the serum concentration of FLUoxetine. Risk C: Monitor therapy
Fluticasone (Nasal): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Fluticasone (Nasal). Risk X: Avoid combination
Fluticasone (Oral Inhalation): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Fluticasone (Oral Inhalation). Management: Consider alternatives to this combination if possible. Coadministration of fluticasone propionate and strong CYP3A4 inhibitors is not recommended. If combined, monitor patients for systemic corticosteroid adverse effects (eg, adrenal suppression). Risk D: Consider therapy modification
Fluticasone (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Fluticasone (Topical). Risk C: Monitor therapy
Fosaprepitant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Fosaprepitant. Risk X: Avoid combination
Fostamatinib: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Fostamatinib. Risk C: Monitor therapy
Fusidic Acid (Systemic): May increase the serum concentration of CYP3A4 Substrates (High risk with Inhibitors). Risk X: Avoid combination
Futibatinib: Inhibitors of CYP3A4 (Strong) and P-glycoprotein may increase the serum concentration of Futibatinib. Risk X: Avoid combination
Galantamine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Galantamine. Risk C: Monitor therapy
Gefitinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Gefitinib. Management: Avoid use of inhibitors of the proton pump (PPIs or PCABs) with gefitinib when possible. If required, administer gefitinib 12 hours after the PPI/PCAB or 12 hours before the next dose of the PPI/PCAB. Closely monitor clinical response to gefitinib. Risk D: Consider therapy modification
Gepirone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Gepirone. Risk X: Avoid combination
Gilteritinib: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Gilteritinib. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Gilteritinib. Management: Consider alternatives to the use of gilteritinib with strong CYP3A4 inhibitors that prolong the QTc interval whenever possible. Risk D: Consider therapy modification
Glasdegib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Glasdegib. Management: Consider alternatives to this combination when possible. If the combination must be used, monitor closely for evidence of QT interval prolongation and other adverse reactions to glasdegib. Risk D: Consider therapy modification
Glecaprevir and Pibrentasvir: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Glecaprevir and Pibrentasvir. Risk C: Monitor therapy
Gliclazide: Omeprazole may increase the serum concentration of Gliclazide. Risk C: Monitor therapy
GuanFACINE: CYP3A4 Inhibitors (Strong) may increase the serum concentration of GuanFACINE. Management: Reduce the extended-release guanfacine dose 50% when combined with a strong CYP3A4 inhibitor. Monitor for increased guanfacine toxicities when these agents are combined. Risk D: Consider therapy modification
Halofantrine: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Halofantrine. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Halofantrine. Management: Consider alternatives to this combination. If combined, monitor for QTc interval prolongation and ventricular arrhythmias. Patients with additional risk factors for QTc prolongation may be at even higher risk. Risk D: Consider therapy modification
Haloperidol: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Haloperidol. 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 therapy
Hormonal Contraceptives: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Hormonal Contraceptives. Risk C: Monitor therapy
HYDROcodone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of HYDROcodone. Risk C: Monitor therapy
Hydrocortisone (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Hydrocortisone (Systemic). Risk C: Monitor therapy
Ibrexafungerp: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ibrexafungerp. Management: Decrease the ibrexafungerp dose to 150 mg every 12 hours for 2 doses in patients receiving strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Ibrutinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ibrutinib. Management: Avoid concomitant use of ibrutinib and strong CYP3A4 inhibitors. If a strong CYP3A4 inhibitor must be used short-term (eg, anti-infectives for 7 days or less), interrupt ibrutinib therapy until the strong CYP3A4 inhibitor is discontinued. Risk X: Avoid combination
Idelalisib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Idelalisib. Management: Use alternative therapies that are not strong CYP3A4 inhibitors whenever possible. If unable to use alternative drugs, monitor patients more frequently for idelalisib toxicities. Risk D: Consider therapy modification
Ifosfamide: CYP3A4 Inhibitors (Strong) may decrease serum concentrations of the active metabolite(s) of Ifosfamide. Risk C: Monitor therapy
Iloperidone: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Iloperidone. Specifically, concentrations of the metabolites P88 and P95 may be increased. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Iloperidone. Management: Reduce iloperidone dose by half when administered with a strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Imatinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Imatinib. Risk C: Monitor therapy
Imidafenacin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Imidafenacin. Risk C: Monitor therapy
Immune Checkpoint Inhibitors (Anti-PD-1, -PD-L1, and -CTLA4 Therapies): Antibiotics may diminish the therapeutic effect of Immune Checkpoint Inhibitors (Anti-PD-1, -PD-L1, and -CTLA4 Therapies). Risk C: Monitor therapy
Immune Checkpoint Inhibitors (Anti-PD-1, -PD-L1, and -CTLA4 Therapies): Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the therapeutic effect of Immune Checkpoint Inhibitors (Anti-PD-1, -PD-L1, and -CTLA4 Therapies). Risk C: Monitor therapy
Infigratinib: CYP3A4 Inhibitors (Strong) may decrease serum concentrations of the active metabolite(s) of Infigratinib. CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Infigratinib. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Infigratinib. Risk X: Avoid combination
Infigratinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease serum concentrations of the active metabolite(s) of Infigratinib. Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Infigratinib. Risk X: Avoid combination
Irinotecan Products: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Irinotecan Products. Specifically, serum concentrations of SN-38 may be increased. Management: Avoid administration of strong CYP3A4 inhibitors during and within 1 week prior to irinotecan administration, unless no therapeutic alternatives to these agents exist. If combined, monitor closely for increased irinotecan toxicities. Risk D: Consider therapy modification
Isavuconazonium Sulfate: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Isavuconazonium Sulfate. Specifically, CYP3A4 Inhibitors (Strong) may increase isavuconazole serum concentrations. Risk X: Avoid combination
Isradipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Isradipine. Risk C: Monitor therapy
Istradefylline: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Istradefylline. Management: Limit the maximum istradefylline dose to 20 mg daily when combined with strong CYP3A4 inhibitors and monitor for increased istradefylline effects/toxicities. Risk D: Consider therapy modification
Itraconazole: Inhibitors of the Proton Pump (PPIs and PCABs) may increase the serum concentration of Itraconazole. This specifically applies to the super bioavailable itraconazole products (eg, Tolsura brand). Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Itraconazole. This specifically applies to the non-super bioavailable itraconazole products (eg, Sporanox brand and its generics). Management: Exposure to Tolsura brand itraconazole may be increased by PPIs or PCABs ; consider itraconazole dose reduction. Exposure to Sporanox brand itraconazole may be decreased. Give Sporanox brand itraconazole at least 2 hrs before or 2 hrs after PPIs or PCABs. Risk D: Consider therapy modification
Ivabradine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ivabradine. Risk X: Avoid combination
Ivacaftor: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ivacaftor. Management: Ivacaftor dose reductions are required; consult full drug interaction monograph content for age- and weight-specific recommendations. Risk D: Consider therapy modification
Ixabepilone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ixabepilone. Management: Avoid use of ixabepilone and strong CYP3A4 inhibitors when possible. If combined, reduce the ixabepilone dose to 20 mg/m2. The previous ixabepilone dose can be resumed 1 week after discontinuation of the strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Ketamine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ketamine. Risk C: Monitor therapy
Ketoconazole (Systemic): Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the absorption of Ketoconazole (Systemic). Ketoconazole (Systemic) may increase the serum concentration of Inhibitors of the Proton Pump (PPIs and PCABs). Management: Administer ketoconazole with an acidic beverage, such as non-diet cola, to increase gastric acidity and improve absorption if concomitant use with proton pump inhibitors or potassium-competitive acid blockers is necessary. Risk D: Consider therapy modification
Khat: May decrease the serum concentration of Amoxicillin. Management: Consider administering amoxicillin before, or 2 hours after, khat chewing to avoid reductions in amoxicillin bioavailability. Risk D: Consider therapy modification
Lacidipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lacidipine. Risk C: Monitor therapy
Lactobacillus and Estriol: Antibiotics may diminish the therapeutic effect of Lactobacillus and Estriol. Risk C: Monitor therapy
Lapatinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lapatinib. Management: Avoid use of lapatinib and strong CYP3A4 inhibitors when possible. If combined, a reduced lapatinib dose of 500 mg daily should be considered. The previous lapatinib dose can be resumed 1 week after discontinuation of the strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Larotrectinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Larotrectinib. Management: Avoid use of strong CYP3A4 inhibitors with larotrectinib. If this combination cannot be avoided, reduce the larotrectinib dose by 50%. Increase to previous dose after stopping the inhibitor after a period of 3 to 5 times the inhibitor's half-life. Risk D: Consider therapy modification
Ledipasvir: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Ledipasvir. Management: PPI or PCAB doses equivalent to omeprazole 20 mg or lower may be given with ledipasvir under fasted conditions. Use of ledipasvir with higher doses or with food, or 2 hours after a these agents, may reduce ledipasvir bioavailability. Risk D: Consider therapy modification
Lefamulin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lefamulin. Management: Avoid concomitant use of lefamulin tablets and strong inhibitors of CYP3A4. Risk X: Avoid combination
Lemborexant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lemborexant. Risk X: Avoid combination
Leniolisib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Leniolisib. Risk X: Avoid combination
Lercanidipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lercanidipine. Risk X: Avoid combination
Leuprolide and Norethindrone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Leuprolide and Norethindrone. Specifically, concentrations of norethindrone may increase. Risk C: Monitor therapy
Levamlodipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Levamlodipine. Risk C: Monitor therapy
Levobupivacaine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Levobupivacaine. Risk C: Monitor therapy
Levoketoconazole: QT-prolonging CYP3A4 Substrates may enhance the QTc-prolonging effect of Levoketoconazole. Levoketoconazole may increase the serum concentration of QT-prolonging CYP3A4 Substrates. Risk X: Avoid combination
Levoketoconazole: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the absorption of Levoketoconazole. Levoketoconazole may increase the serum concentration of Inhibitors of the Proton Pump (PPIs and PCABs). Risk X: Avoid combination
Levomethadone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Levomethadone. Risk C: Monitor therapy
Levomilnacipran: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Levomilnacipran. Management: The dose of levomilnacipran should not exceed 80 mg once daily when used with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Lidocaine (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lidocaine (Systemic). Risk C: Monitor therapy
Lomitapide: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lomitapide. Risk X: Avoid combination
Lonafarnib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lonafarnib. Risk X: Avoid combination
Lorlatinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lorlatinib. Management: Avoid use of lorlatinib with strong CYP3A4 inhibitors. If the combination cannot be avoided, reduce the lorlatinib dose from 100 mg once daily to 75 mg once daily, or from 75 mg once daily to 50 mg once daily. Risk D: Consider therapy modification
Lovastatin: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Lovastatin. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lovastatin. Risk X: Avoid combination
Lumateperone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lumateperone. Management: Limit the lumateperone dose to 10.5 mg once daily when used with a strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Lurasidone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lurasidone. Risk X: Avoid combination
Lurbinectedin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Lurbinectedin. Management: Avoid concomitant use of lurbinectedin and strong CYP3A4 inhibitors. If coadministration with a strong CYP3A4 inhibitor cannot be avoided, reduce the lurbinectedin dose by 50%. Risk D: Consider therapy modification
Macitentan: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Macitentan. Risk X: Avoid combination
Manidipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Manidipine. Management: Consider avoiding concomitant use of manidipine and strong CYP3A4 inhibitors. If combined, monitor closely for increased manidipine effects and toxicities. Manidipine dose reductions may be required. Risk D: Consider therapy modification
Maraviroc: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Maraviroc. Management: Reduce maraviroc to 150mg twice/day in adult and pediatrics weighing 40kg or more. See full interaction monograph for dose adjustments in pediatrics weighing 10 to less than 40kg. Do not use if CrCl less than 30mL/min or in those weighing less than 10 kg. Risk D: Consider therapy modification
Mavacamten: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mavacamten. Risk X: Avoid combination
Mefloquine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mefloquine. Risk C: Monitor therapy
Meperidine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Meperidine. Risk C: Monitor therapy
Methotrexate: Inhibitors of the Proton Pump (PPIs and PCABs) may increase the serum concentration of Methotrexate. Management: Consider temporarily interrupting PPI or PCAB therapy in patients receiving high-dose methotrexate. If coadministered, monitor for increased methotrexate toxicity (eg, mucositis, myalgias) and/or delayed methotrexate elimination. Risk D: Consider therapy modification
MethylPREDNISolone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of MethylPREDNISolone. Risk C: Monitor therapy
Midazolam: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Midazolam. Management: Avoid use of nasal midazolam and strong CYP3A4 inhibitors whenever possible, and consider alternatives to use with other routes of midazolam (oral, IV, IM). If combined, consider lower midazolam doses and monitor for increased midazolam toxicities. Risk D: Consider therapy modification
Midostaurin: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Midostaurin. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Midostaurin. Management: Consider alternatives to this drug combination. If combined, monitor for QTc interval prolongation and ventricular arrhythmias. Patients with additional risk factors for QTc prolongation may be at even higher risk. Risk D: Consider therapy modification
MiFEPRIStone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of MiFEPRIStone. Management: For treatment of hyperglycemia in Cushing's syndrome, start mifepristone at 300 mg/day, may titrate to a maximum of 900 mg/day. If starting a strong CYP3A4 inhibitor and taking > 300 mg/day mifepristone, decrease the mifepristone dose by 300 mg/day. Risk D: Consider therapy modification
Mirodenafil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mirodenafil. Management: Consider using a lower dose of mirodenafil when used with strong CYP3A4 inhibitors. Monitor for increased mirodenafil effects/toxicities with the use of this combination. Risk D: Consider therapy modification
Mirtazapine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mirtazapine. Risk C: Monitor therapy
Mirvetuximab Soravtansine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mirvetuximab Soravtansine. Risk C: Monitor therapy
Mitapivat: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mitapivat. Risk X: Avoid combination
Mizolastine: Macrolide Antibiotics may increase the serum concentration of Mizolastine. Risk X: Avoid combination
Moclobemide: May increase the serum concentration of Omeprazole. Omeprazole may increase the serum concentration of Moclobemide. Risk C: Monitor therapy
Momelotinib: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Momelotinib. Risk C: Monitor therapy
Mometasone (Nasal): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mometasone (Nasal). Risk C: Monitor therapy
Mometasone (Oral Inhalation): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mometasone (Oral Inhalation). Risk C: Monitor therapy
Mometasone (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Mometasone (Topical). Risk C: Monitor therapy
Morphine (Systemic): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Morphine (Systemic). Risk C: Monitor therapy
Multivitamins/Minerals (with ADEK, Folate, Iron): Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Multivitamins/Minerals (with ADEK, Folate, Iron). Specifically, the absorption of iron may be decreased. Risk C: Monitor therapy
Mycophenolate: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Mycophenolate. Specifically, concentrations of the active mycophenolic acid may be reduced. Risk C: Monitor therapy
Mycophenolate: Penicillins may decrease serum concentrations of the active metabolite(s) of Mycophenolate. This effect appears to be the result of impaired enterohepatic recirculation. Risk C: Monitor therapy
Nadolol: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Nadolol. Risk C: Monitor therapy
Naldemedine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Naldemedine. Risk C: Monitor therapy
Nalfurafine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Nalfurafine. Risk C: Monitor therapy
Naloxegol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Naloxegol. Risk X: Avoid combination
Nelfinavir: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease serum concentrations of the active metabolite(s) of Nelfinavir. Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Nelfinavir. Management: Due to potentially significant reductions in nelfinavir exposure, avoid concurrent use of nelfinavir with a PPI or PCAB when possible. If unavoidable, consider PPI or PCAB use for a short duration (less than 30 days) and closely monitor viral load. Risk D: Consider therapy modification
Neratinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Neratinib. Risk X: Avoid combination
Neratinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Neratinib. Specifically, proton pump inhibitors may reduce neratinib absorption. Risk X: Avoid combination
Nevirapine: May increase serum concentrations of the active metabolite(s) of Clarithromycin. Nevirapine may decrease the serum concentration of Clarithromycin. Management: Consider alternatives to clarithromycin, such as azithromycin, for the treatment of Mycobacterium avium-intracellulare complex in patients taking nevirapine. Risk D: Consider therapy modification
NiCARdipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of NiCARdipine. Risk C: Monitor therapy
NIFEdipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of NIFEdipine. Management: Consider alternatives to this combination when possible. If combined, initiate nifedipine at the lowest dose available and monitor patients closely for increased nifedipine effects and toxicities (eg, hypotension, edema). Risk D: Consider therapy modification
Nilotinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Nilotinib. Management: Avoid this combination. Histamine H2 receptor antagonists (H2RAs) given 10 hours before or 2 hours after nilotinib, or antacids given 2 hours before or 2 hours after nilotinib are acceptable alternatives. Risk D: Consider therapy modification
Nilotinib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Nilotinib. Management: Avoid concomitant use of nilotinib and strong CYP3A4 inhibitors that prolong the QTc interval whenever possible. If combined, nilotinib dose reductions are required. Monitor patients for nilotinib toxicities including QTc prolongation and arrhythmias. Risk D: Consider therapy modification
Nilvadipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Nilvadipine. Risk C: Monitor therapy
NiMODipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of NiMODipine. Risk X: Avoid combination
Nintedanib: Inhibitors of CYP3A4 (Strong) and P-glycoprotein may increase the serum concentration of Nintedanib. Risk C: Monitor therapy
Nirogacestat: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Nirogacestat. Risk X: Avoid combination
Nirogacestat: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Nirogacestat. Risk X: Avoid combination
Nisoldipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Nisoldipine. Risk X: Avoid combination
Nitrendipine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Nitrendipine. Risk C: Monitor therapy
Octreotide: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Octreotide. Risk C: Monitor therapy
Olaparib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Olaparib. Management: Avoid use of strong CYP3A4 inhibitors with olaparib, if possible. If such concurrent use cannot be avoided, the dose of olaparib tablets should be reduced to 100 mg twice daily and the dose of olaparib capsules should be reduced to 150 mg twice daily. Risk D: Consider therapy modification
Oliceridine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Oliceridine. Risk C: Monitor therapy
Olmutinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Olmutinib. Risk C: Monitor therapy
Omaveloxolone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Omaveloxolone. Management: Avoid this combination if possible. If coadministration is required, decrease the omaveloxolone dose to 50 mg daily and monitor closely for adverse reactions. Discontinue coadministration if adverse reactions occur. Risk D: Consider therapy modification
Ondansetron: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Ondansetron. 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 therapy
Orelabrutinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Orelabrutinib. Risk X: Avoid combination
Osilodrostat: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Osilodrostat. Management: Reduce osilodrostat dose by 50% during coadministration with a strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Osimertinib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). Management: Consider alternatives to this drug combination. If combined, monitor for QTc interval prolongation and ventricular arrhythmias. Patients with additional risk factors for QTc prolongation may be at even higher risk. Risk D: Consider therapy modification
Ospemifene: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ospemifene. Risk C: Monitor therapy
OxyBUTYnin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of OxyBUTYnin. Risk C: Monitor therapy
OxyCODONE: CYP3A4 Inhibitors (Strong) may enhance the adverse/toxic effect of OxyCODONE. CYP3A4 Inhibitors (Strong) may increase the serum concentration of OxyCODONE. Serum concentrations of the active metabolite oxymorphone may also be increased. Risk C: Monitor therapy
PACLitaxel (Conventional): CYP3A4 Inhibitors (Strong) may increase the serum concentration of PACLitaxel (Conventional). Risk C: Monitor therapy
PACLitaxel (Protein Bound): CYP3A4 Inhibitors (Strong) may increase the serum concentration of PACLitaxel (Protein Bound). Risk C: Monitor therapy
Pacritinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Pacritinib. Risk X: Avoid combination
Palbociclib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Palbociclib. Management: Avoid concurrent use of strong CYP3A4 inhibitors with palbociclib when possible. If the use of a strong CYP3A4 inhibitor cannot be avoided, decrease the palbociclib dose to 75 mg/day. Risk D: Consider therapy modification
Palbociclib: Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the therapeutic effect of Palbociclib. Specifically, this has been reported with the use of palbociclib capsules. Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Palbociclib. Specifically, this may occur with the use of palbociclib capsules, and to the greatest extent when taken without food. Management: Carefully evaluate potential risks and benefits of coadministration of palbociclib capsules and proton pump inhibitors or potassium-competitive acid blockers due to the risk of reduced palbociclib efficacy. Palbociclib capsules should be taken with food. Risk D: Consider therapy modification
Palovarotene: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Palovarotene. Risk X: Avoid combination
Panobinostat: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Panobinostat. Management: Reduce the panobinostat dose to 10 mg when it must be used with a strong CYP3A4 inhibitor. Monitor patient response to therapy closely for evidence of more severe adverse effects related to panobinostat therapy. Risk D: Consider therapy modification
Parecoxib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Parecoxib. Specifically, serum concentrations of the active moiety valdecoxib may be increased. Risk C: Monitor therapy
Paricalcitol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Paricalcitol. Risk C: Monitor therapy
PAZOPanib: Clarithromycin may enhance the QTc-prolonging effect of PAZOPanib. Clarithromycin may increase the serum concentration of PAZOPanib. Risk X: Avoid combination
Pemigatinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Pemigatinib. Management: If combined use cannot be avoided, reduce the pemigatinib dose from 13.5 mg daily to 9 mg daily, or from 9 mg daily to 4.5 mg daily. Resume prior pemigatinib dose after stopping the strong inhibitor once 3 half-lives of the inhibitor has passed. Risk D: Consider therapy modification
Pentamidine (Systemic): May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate 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 therapy
Pexidartinib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Pexidartinib. Management: Avoid this combination. If acid-reduction is needed, consider administering an antacid 2 hours before or after pexidartinib, or administer pexidartinib 2 hours before or 10 hours after an H2 receptor antagonist. Risk X: Avoid combination
Pimavanserin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Pimavanserin. Management: Decrease the pimavanserin dose to 10 mg daily when combined with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Pimecrolimus: CYP3A4 Inhibitors (Strong) may decrease the metabolism of Pimecrolimus. Risk C: Monitor therapy
Pimozide: May enhance the QTc-prolonging effect of QT-prolonging Agents (Moderate Risk). Risk X: Avoid combination
Piperaquine: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Piperaquine. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Piperaquine. Management: Consider alternatives to this drug combination. If combined, monitor for QTc interval prolongation and ventricular arrhythmias. Patients with additional risk factors for QTc prolongation may be at even higher risk. Risk D: Consider therapy modification
Pirtobrutinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Pirtobrutinib. Management: Avoid concomitant use when possible. If combined, reduce the pirtobrutinib dose by 50 mg. If current dose is 50 mg, interrupt pirtobrutinib treatment during strong CYP3A4 inhibitor use. Risk D: Consider therapy modification
Polatuzumab Vedotin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Polatuzumab Vedotin. Exposure to unconjugated MMAE, the cytotoxic small molecule component of polatuzumab vedotin, may be increased. Risk C: Monitor therapy
PONATinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of PONATinib. Management: Avoid concomitant use if possible. If combined, reduce ponatinib dose as follows: If taking 45 mg, reduce to 30 mg; if taking 30 mg, reduce to 15 mg; if taking 15 mg, reduce to 10 mg. If taking 10 mg, avoid concomitant use with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Posaconazole: May increase the serum concentration of QT-prolonging CYP3A4 Substrates. Such increases may lead to a greater risk for proarrhythmic effects and other similar toxicities. Risk X: Avoid combination
Pralsetinib: Inhibitors of CYP3A4 (Strong) and P-glycoprotein may increase the serum concentration of Pralsetinib. Management: Avoid concomitant use if possible. If combined, reduce the pralsetinib dose. If taking 400 mg or 300 mg once daily, reduce to 200 mg once daily. If taking 200 mg once daily, reduce to 100 mg once daily. Risk D: Consider therapy modification
Pravastatin: Clarithromycin may increase the serum concentration of Pravastatin. Management: Limit pravastatin to a maximum of 40 mg/day when used in combination with clarithromycin. If this combination is used, monitor patients more closely for evidence of pravastatin toxicity. Risk D: Consider therapy modification
Prazepam: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Prazepam. Risk C: Monitor therapy
Praziquantel: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Praziquantel. Risk C: Monitor therapy
PrednisoLONE (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of PrednisoLONE (Systemic). Risk C: Monitor therapy
PredniSONE: CYP3A4 Inhibitors (Strong) may increase the serum concentration of PredniSONE. Risk C: Monitor therapy
Probenecid: May increase the serum concentration of Penicillins. Risk C: Monitor therapy
Propofol: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Propofol. 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 therapy
Protease Inhibitors: May decrease serum concentrations of the active metabolite(s) of Clarithromycin. Protease Inhibitors may increase the serum concentration of Clarithromycin. Management: Do not exceed clarithromycin doses greater than 1,000 mg/day in patients taking protease inhibitors. If CrCL is 30 to 60 mL/min, reduced clarithromycin dose 50%. If CrCL is less than 30 mL/min, reduced clarithromycin dose 75%. Risk D: Consider therapy modification
QT-prolonging Agents (Highest Risk): May enhance the QTc-prolonging effect of Clarithromycin. Risk X: Avoid combination
QT-prolonging Antidepressants (Moderate Risk): QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of QT-prolonging Antidepressants (Moderate Risk). Risk C: Monitor therapy
QT-prolonging Antipsychotics (Moderate Risk): May enhance the QTc-prolonging effect of Clarithromycin. 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 therapy
QT-prolonging Class IC Antiarrhythmics (Moderate Risk): May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate 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 therapy
QT-Prolonging Inhalational Anesthetics (Moderate Risk): QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of QT-Prolonging Inhalational Anesthetics (Moderate 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 therapy
QT-prolonging Miscellaneous Agents (Moderate Risk): QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of QT-prolonging Miscellaneous Agents (Moderate 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 therapy
QT-prolonging Quinolone Antibiotics (Moderate Risk): May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate 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 therapy
QUEtiapine: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of QUEtiapine. Management: Reduce the quetiapine dose to one-sixth of the regular dose when initiating these strong CYP3A4 inhibitors. In patients already receiving these strong CYP3A4 inhibitors, initiate quetiapine at the lowest dose and titrate cautiously as needed. Risk D: Consider therapy modification
Quinidine (Non-Therapeutic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Quinidine (Non-Therapeutic). Risk C: Monitor therapy
Quizartinib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Quizartinib. Management: If combination is necessary, reduce quizartinib dose as follows: from 53 mg daily to 26.5 mg daily; from 35.4 mg daily to 17.7 mg daily; from 26.5 mg daily to 17.7 mg daily. If taking 17.7 mg daily avoid quizartinib while on the strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Radotinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Radotinib. Risk X: Avoid combination
Ramelteon: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ramelteon. Risk C: Monitor therapy
Ranolazine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ranolazine. Risk X: Avoid combination
Reboxetine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Reboxetine. Risk C: Monitor therapy
Red Yeast Rice: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Red Yeast Rice. Specifically, concentrations of lovastatin and related compounds found in Red Yeast Rice may be increased. Risk X: Avoid combination
Regorafenib: CYP3A4 Inhibitors (Strong) may decrease serum concentrations of the active metabolite(s) of Regorafenib. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Regorafenib. Risk X: Avoid combination
Relugolix: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Relugolix. Management: Avoid coadministration of relugolix with oral P-gp inhibitors whenever possible. If combined, take relugolix at least 6 hours prior to the P-gp inhibitor and monitor patients more frequently for adverse reactions. Risk D: Consider therapy modification
Relugolix, Estradiol, and Norethindrone: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Relugolix, Estradiol, and Norethindrone. Management: Avoid use of relugolix/estradiol/norethindrone with P-glycoprotein (P-gp) inhibitors. If concomitant use is unavoidable, relugolix/estradiol/norethindrone should be administered at least 6 hours before the P-gp inhibitor. Risk D: Consider therapy modification
Repaglinide: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Repaglinide. Risk C: Monitor therapy
Repotrectinib: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Repotrectinib. Risk X: Avoid combination
Retapamulin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Retapamulin. Management: The use of retapamulin with strong CYP3A4 inhibitors is not recommended in patients less than 2 years old. No action is required in other populations. Risk C: Monitor therapy
Revefenacin: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase serum concentrations of the active metabolite(s) of Revefenacin. Risk X: Avoid combination
Ribociclib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Ribociclib. Management: Avoid concomitant use of ribociclib and strong CYP3A4 inhibitors that prolong the QTc interval whenever possible. If combined, decrease the ribociclib dose to 400 mg daily. Monitor for ribociclib toxicities including QTc prolongation and arrhythmias. Risk D: Consider therapy modification
Rifabutin: May increase serum concentrations of the active metabolite(s) of Clarithromycin. Rifabutin may decrease the serum concentration of Clarithromycin. Clarithromycin may increase the serum concentration of Rifabutin. Management: Consider alternatives to this combination when possible. If combined, consider use of lower rifabutin doses and monitor patients for increased rifabutin toxicities. Additionally, monitor for reduced clarithromycin efficacy when these agents are combined. Risk D: Consider therapy modification
RifAXIMin: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of RifAXIMin. Risk C: Monitor therapy
Rilpivirine: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Rilpivirine. Risk X: Avoid combination
Rimegepant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Rimegepant. Risk X: Avoid combination
Riociguat: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Riociguat. Risk C: Monitor therapy
Riociguat: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Riociguat. Risk C: Monitor therapy
Ripretinib: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Ripretinib. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ripretinib. Risk C: Monitor therapy
Risedronate: Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the therapeutic effect of Risedronate. Inhibitors of the Proton Pump (PPIs and PCABs) may increase the serum concentration of Risedronate. This applies specifically to use of delayed-release risedronate. Management: Coadministration of PPIs or PCABs with delayed-release risedronate formulations is not recommended. Limit PPI/PCAB dose and duration during coadministration with risedronate as possible. Patients over age 70 are at higher risk of adverse effects. Risk D: Consider therapy modification
RisperiDONE: May enhance the QTc-prolonging effect of Clarithromycin. Clarithromycin may increase the serum concentration of RisperiDONE. Management: Monitor for increased risperidone toxicities, including 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 therapy
Rivaroxaban: Clarithromycin may increase the serum concentration of Rivaroxaban. Risk C: Monitor therapy
Roflumilast-Containing Products: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Roflumilast-Containing Products. Risk C: Monitor therapy
RomiDEPsin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of RomiDEPsin. Risk C: Monitor therapy
Rupatadine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Rupatadine. Risk X: Avoid combination
Ruxolitinib (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ruxolitinib (Systemic). Management: This combination should be avoided under some circumstances; dose adjustments may be required in some circumstances and depend on the indication for ruxolitinib. See monograph for details. Risk D: Consider therapy modification
Ruxolitinib (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ruxolitinib (Topical). Risk X: Avoid combination
Salmeterol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Salmeterol. Risk X: Avoid combination
Saquinavir: May enhance the QTc-prolonging effect of Clarithromycin. Clarithromycin may increase the serum concentration of Saquinavir. Risk X: Avoid combination
SAXagliptin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of SAXagliptin. Management: Limit the saxagliptin dose to 2.5 mg daily when combined with strong CYP3A4 inhibitors. When using the saxagliptin combination products saxagliptin/dapagliflozin or saxagliptin/dapagliflozin/metformin, avoid use with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Secretin: Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the diagnostic effect of Secretin. Specifically, use of PPIs may cause a hyperresponse in gastrin secretion in response to secretin stimulation testing, falsely suggesting gastrinoma. Management: Avoid concomitant use of PPIs or PCABs and secretin, and discontinue PPI or PCAB several weeks prior to secretin administration, with the duration of separation determined by the specific acid suppressant. See full monograph for details. Risk D: Consider therapy modification
Selumetinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Selumetinib. Management: Avoid concomitant use when possible. If combined, selumetinib dose reductions are recommended and vary based on body surface area and selumetinib dose. For details, see the full drug interaction monograph or selumetinib prescribing information. Risk D: Consider therapy modification
Sertindole: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Sertindole. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Sertindole. Risk X: Avoid combination
Sibutramine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Sibutramine. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Sibutramine. Risk C: Monitor therapy
Sildenafil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Sildenafil. Management: Use of sildenafil for pulmonary arterial hypertension (PAH) should be avoided with strong CYP3A4 inhibitors. When used for erectile dysfunction, consider using a lower starting dose of 25 mg and monitor patients for sildenafil toxicities. Risk D: Consider therapy modification
Silodosin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Silodosin. Risk X: Avoid combination
Simeprevir: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Simeprevir. Risk X: Avoid combination
Simvastatin: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Simvastatin. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Simvastatin. Risk X: Avoid combination
Sincalide: Drugs that Affect Gallbladder Function may diminish the therapeutic effect of Sincalide. Management: Consider discontinuing drugs that may affect gallbladder motility prior to the use of sincalide to stimulate gallbladder contraction. Risk D: Consider therapy modification
Sirolimus (Conventional): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Sirolimus (Conventional). Management: Avoid concurrent use of sirolimus with strong CYP3A4 inhibitors when possible and alternative agents with lesser interaction potential with sirolimus should be considered. Concomitant use of sirolimus and voriconazole or posaconazole is contraindicated. Risk D: Consider therapy modification
Sirolimus (Conventional): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Sirolimus (Conventional). Management: Avoid concurrent use of sirolimus with P-glycoprotein (P-gp) inhibitors when possible and alternative agents with lesser interaction potential with sirolimus should be considered. Monitor for increased sirolimus concentrations/toxicity if combined. Risk D: Consider therapy modification
Sirolimus (Protein Bound): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Sirolimus (Protein Bound). Risk X: Avoid combination
Sirolimus (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Sirolimus (Topical). Risk C: Monitor therapy
Sodium Benzoate: Penicillins may diminish the therapeutic effect of Sodium Benzoate. Risk C: Monitor therapy
Sodium Picosulfate: Antibiotics may diminish the therapeutic effect of Sodium Picosulfate. Management: Consider using an alternative product for bowel cleansing prior to a colonoscopy in patients who have recently used or are concurrently using an antibiotic. Risk D: Consider therapy modification
Solifenacin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Solifenacin. Management: Limit adult solifenacin doses to 5 mg daily and limit doses in pediatric patients to the recommended weight-based starting dose (and do not increase the dose) when combined with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Sonidegib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Sonidegib. Risk X: Avoid combination
SORAfenib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the absorption of SORAfenib. Risk C: Monitor therapy
Sotorasib: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Sotorasib. Risk X: Avoid combination
Sparsentan: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Sparsentan. Risk X: Avoid combination
Sparsentan: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Sparsentan. Risk X: Avoid combination
St John's Wort: May decrease the serum concentration of Omeprazole. Risk X: Avoid combination
SUFentanil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of SUFentanil. Management: If a strong CYP3A4 inhibitor is initiated in a patient on sufentanil, consider a sufentanil dose reduction and monitor for increased sufentanil effects and toxicities (eg, respiratory depression). Risk D: Consider therapy modification
Sulfonylureas: Clarithromycin may enhance the hypoglycemic effect of Sulfonylureas. Risk C: Monitor therapy
SUNItinib: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of SUNItinib. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of SUNItinib. Management: Avoid when possible. If combined, decrease sunitinib dose to a minimum of 37.5 mg daily when treating GIST or RCC. Decrease sunitinib dose to a minimum of 25 mg daily when treating PNET. Monitor patients for both reduced efficacy and increased toxicities. Risk D: Consider therapy modification
Suvorexant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Suvorexant. Risk X: Avoid combination
Tacrolimus (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tacrolimus (Systemic). Management: Reduce tacrolimus dose to one-third of the original dose if starting posaconazole or voriconazole. Coadministration with nelfinavir is not generally recommended. Tacrolimus dose reductions or prolongation of dosing interval will likely be required. Risk D: Consider therapy modification
Tacrolimus (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tacrolimus (Topical). Risk C: Monitor therapy
Tadalafil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tadalafil. Management: Avoid this combination in patients taking tadalafil for pulmonary arterial hypertension. In patients taking tadalafil for ED or BPH, max tadalafil dose is 2.5 mg if taking daily or 10 mg no more frequently than every 72 hours if used as needed. Risk D: Consider therapy modification
Talazoparib: Clarithromycin may increase the serum concentration of Talazoparib. Management: In breast cancer, if concurrent use cannot be avoided, reduce talazoparib dose to 0.75 mg once daily. In prostate cancer, monitor patients for increased adverse events. Risk D: Consider therapy modification
Tamsulosin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tamsulosin. Risk X: Avoid combination
Tasimelteon: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tasimelteon. Risk C: Monitor therapy
Taurursodiol: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Taurursodiol. Risk X: Avoid combination
Tazemetostat: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tazemetostat. Risk X: Avoid combination
Technetium Tc 99m Sestamibi: Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the diagnostic effect of Technetium Tc 99m Sestamibi. Management: Consider holding/stopping proton pump inhibitor therapy for at least 3 days prior to the use technetium Tc 99m sestamibi in cardiac imaging procedures. Risk D: Consider therapy modification
Technetium Tc 99m Tetrofosmin: Inhibitors of the Proton Pump (PPIs and PCABs) may diminish the diagnostic effect of Technetium Tc 99m Tetrofosmin. Risk C: Monitor therapy
Tegaserod (Withdrawn from US Market): P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Tegaserod (Withdrawn from US Market). Risk C: Monitor therapy
Temsirolimus: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Temsirolimus. Specifically, concentrations of sirolimus may be increased. Management: Avoid concomitant use of temsirolimus and strong CYP3A4 inhibitors. If coadministration is unavoidable, decrease temsirolimus dose to 12.5 mg per week. Resume previous temsirolimus dose 1 week after discontinuation of the strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Teniposide: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Teniposide. Risk C: Monitor therapy
Tenofovir Disoproxil Fumarate: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Tenofovir Disoproxil Fumarate. Risk C: Monitor therapy
Terfenadine: QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may enhance the QTc-prolonging effect of Terfenadine. QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Terfenadine. Risk X: Avoid combination
Tetracyclines: May diminish the therapeutic effect of Penicillins. Risk C: Monitor therapy
Tetrahydrocannabinol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tetrahydrocannabinol. Risk C: Monitor therapy
Tetrahydrocannabinol and Cannabidiol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tetrahydrocannabinol and Cannabidiol. Risk C: Monitor therapy
Tezacaftor and Ivacaftor: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tezacaftor and Ivacaftor. Management: If combined with strong CYP3A4 inhibitors, tezacaftor/ivacaftor should be administered in the morning, twice a week, approximately 3 to 4 days apart. Tezacaftor/ivacaftor dose depends on age and weight; see full Lexi-Interact monograph for details. Risk D: Consider therapy modification
Theophylline Derivatives: Clarithromycin may increase the serum concentration of Theophylline Derivatives. Risk C: Monitor therapy
Thiazolidinediones: Inhibitors of the Proton Pump (PPIs and PCABs) may enhance the adverse/toxic effect of Thiazolidinediones. Specifically, the risk of osteoporosis or fracture may be increased. Risk C: Monitor therapy
Thiotepa: CYP3A4 Inhibitors (Strong) may decrease serum concentrations of the active metabolite(s) of Thiotepa. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Thiotepa. Management: Avoid coadministration of thiotepa and strong CYP3A4 inhibitors. If concomitant use cannot be avoided, monitor for thiotepa adverse effects and decreased efficacy. Risk D: Consider therapy modification
Ticagrelor: CYP3A4 Inhibitors (Strong) may decrease serum concentrations of the active metabolite(s) of Ticagrelor. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ticagrelor. Risk X: Avoid combination
Tipranavir: Clarithromycin may increase the serum concentration of Tipranavir. Tipranavir may increase the serum concentration of Clarithromycin. Management: Limit adult clarithromycin doses to 1,000 mg/day if combined with tipranavir. Consider reducing the clarithromycin dose by 50% for patients with CrCl 30 to 60 mL/min, and for patients with CrCl <30 mL/min consider reducing the clarithromycin dose by 75%. Risk D: Consider therapy modification
Tisotumab Vedotin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tisotumab Vedotin. Specifically, concentrations of the active monomethyl auristatin E (MMAE) component may be increased. Risk C: Monitor therapy
Tofacitinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tofacitinib. Management: Tofacitinib dose reductions are recommended when combined with strong CYP3A4 inhibitors. Recommended dose adjustments vary by tofacitinib formulation and therapeutic indication. See full Lexi Interact monograph for details. Risk D: Consider therapy modification
Tolterodine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tolterodine. Management: The maximum recommended dose of tolterodine is 2 mg per day (1 mg twice daily for immediate-release tablets or 2 mg daily for extended-release capsules) when used together with a strong CYP3A4 inhibitor. Risk D: Consider therapy modification
Tolvaptan: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tolvaptan. Risk X: Avoid combination
Topotecan: P-glycoprotein/ABCB1 Inhibitors may increase the serum concentration of Topotecan. Risk X: Avoid combination
Toremifene: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Toremifene. Management: Avoid concomitant use of toremifene and strong CYP3A4 inhibitors that prolong the QTc interval whenever possible. If combined, monitor patients for toremifene toxicities including QTc prolongation and TdP. Risk D: Consider therapy modification
Trabectedin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Trabectedin. Risk X: Avoid combination
TraMADol: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of TraMADol. CYP3A4 Inhibitors (Strong) may increase the serum concentration of TraMADol. Risk C: Monitor therapy
TraZODone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of TraZODone. Management: Consider the use of a lower trazodone dose and monitor for increased trazodone effects (eg, sedation, QTc prolongation) if combined with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Tretinoin (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Tretinoin (Systemic). Risk C: Monitor therapy
Triamcinolone (Nasal): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Triamcinolone (Nasal). Risk C: Monitor therapy
Triamcinolone (Ophthalmic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Triamcinolone (Ophthalmic). Risk C: Monitor therapy
Triamcinolone (Systemic): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Triamcinolone (Systemic). Management: Consider alternatives to this combination when possible. If combined, monitor for increased corticosteroid adverse effects during coadministration of triamcinolone and strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Triamcinolone (Topical): CYP3A4 Inhibitors (Strong) may increase the serum concentration of Triamcinolone (Topical). Risk C: Monitor therapy
Triazolam: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Triazolam. Risk X: Avoid combination
Typhoid Vaccine: Antibiotics may diminish the therapeutic effect of Typhoid Vaccine. Only the live attenuated Ty21a strain is affected. Management: Avoid use of live attenuated typhoid vaccine (Ty21a) in patients being treated with systemic antibacterial agents. Postpone vaccination until 3 days after cessation of antibiotics and avoid starting antibiotics within 3 days of last vaccine dose. Risk D: Consider therapy modification
Ubrogepant: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ubrogepant. Risk X: Avoid combination
Udenafil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Udenafil. Risk X: Avoid combination
Ulipristal: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Ulipristal. Risk C: Monitor therapy
Upadacitinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Upadacitinib. Management: Upadacitinib dose adjustments are needed when combined with strong CYP3A4 inhibitors. Specific adjustments vary based on upadacitinib indication. See full interact monograph for details. Risk D: Consider therapy modification
Valbenazine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Valbenazine. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Valbenazine. Management: Reduce the valbenazine dose to 40 mg daily when combined with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Vamorolone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vamorolone. Management: Reduce the vamorolone dose to 4 mg/kg daily, with a maximum dose of 200 mg daily for patients weighing over 50 kg, when combined with strong CYP3A4 inhibitors. Risk D: Consider therapy modification
Vardenafil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vardenafil. Management: Limit Levitra (vardenafil) dose to a single 2.5 mg dose within a 24-hour period if combined with strong CYP3A4 inhibitors. Avoid concomitant use of Staxyn (vardenafil) and strong CYP3A4 inhibitors. Combined use is contraindicated outside of the US. Risk D: Consider therapy modification
Velpatasvir: Inhibitors of the Proton Pump (PPIs and PCABs) may decrease the serum concentration of Velpatasvir. Management: Sofosbuvir/velpatasvir should be administered with food and taken 4 hours before omeprazole 20 mg. Sofosbuvir/velpatasvir/voxilaprevir can be administered with omeprazole 20 mg. Use with other PPIs or PCABs has not been studied. Risk D: Consider therapy modification
Vemurafenib: May enhance the QTc-prolonging effect of QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk). QT-prolonging Strong CYP3A4 Inhibitors (Moderate Risk) may increase the serum concentration of Vemurafenib. Management: Avoid concomitant use of vemurafenib and strong CYP3A4 inhibitors that prolong the QTc interval whenever possible. If combined monitor patients for vemurafenib toxicities including QTc prolongation and TdP, and consider a vemurafenib dose reduction. Risk D: Consider therapy modification
Venetoclax: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Venetoclax. Management: Coadministration is contraindicated during venetoclax initiation and ramp-up in CLL/SLL patients. Reduced venetoclax doses are required during ramp-up for patients with AML, and all maintenance therapy. See full Lexi Interact monograph for details. Risk D: Consider therapy modification
Verapamil: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Verapamil. Risk C: Monitor therapy
Vilanterol: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vilanterol. Risk C: Monitor therapy
Vilazodone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vilazodone. Management: Limit the maximum vilazodone dose to 20 mg daily in patients receiving strong CYP3A4 inhibitors. The original vilazodone dose can be resumed following discontinuation of the strong CYP3A4 inhibitor. Risk D: Consider therapy modification
VinBLAStine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of VinBLAStine. Risk C: Monitor therapy
VinCRIStine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of VinCRIStine. Management: Seek alternatives to this combination when possible. If combined, monitor closely for vincristine toxicities (eg, neurotoxicity, gastrointestinal toxicity, myelosuppression). Risk D: Consider therapy modification
VinCRIStine (Liposomal): CYP3A4 Inhibitors (Strong) may increase the serum concentration of VinCRIStine (Liposomal). Risk X: Avoid combination
Vindesine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vindesine. Risk C: Monitor therapy
Vinflunine: CYP3A4 Inhibitors (Strong) may increase serum concentrations of the active metabolite(s) of Vinflunine. CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vinflunine. Risk X: Avoid combination
Vinorelbine: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vinorelbine. Risk C: Monitor therapy
Vitamin K Antagonists (eg, warfarin): Omeprazole may increase the serum concentration of Vitamin K Antagonists. Risk C: Monitor therapy
Voclosporin: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Voclosporin. Risk X: Avoid combination
Vorapaxar: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Vorapaxar. Risk X: Avoid combination
Voriconazole: Clarithromycin may enhance the QTc-prolonging effect of Voriconazole. Voriconazole may increase the serum concentration of Clarithromycin. 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 therapy
Voriconazole: Omeprazole may increase the serum concentration of Voriconazole. Voriconazole may increase the serum concentration of Omeprazole. Risk C: Monitor therapy
Voxilaprevir: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Voxilaprevir. Risk X: Avoid combination
Zanubrutinib: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Zanubrutinib. Management: Decrease the zanubrutinib dose to 80 mg once daily during coadministration with a strong CYP3A4 inhibitor. Further dose adjustments may be required for zanubrutinib toxicities, refer to prescribing information for details. Risk D: Consider therapy modification
Zavegepant: OATP1B1/1B3 (SLCO1B1/1B3) Inhibitors may increase the serum concentration of Zavegepant. Risk X: Avoid combination
Zidovudine: Clarithromycin may enhance the myelosuppressive effect of Zidovudine. Clarithromycin may decrease the serum concentration of Zidovudine. Management: Monitor response to zidovudine closely when used with clarithromycin, and consider staggering zidovudine and clarithromycin doses when possible in order to minimize the potential for interaction. Risk D: Consider therapy modification
Zolpidem: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Zolpidem. Risk C: Monitor therapy
Zopiclone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Zopiclone. Management: If coadministered with strong CYP3A4 inhibitors, initiate zopiclone at 3.75 mg in adults, with a maximum dose of 5 mg. Monitor for zopiclone toxicity (eg, drowsiness, confusion, lethargy, ataxia, respiratory depression). Risk D: Consider therapy modification
Zuranolone: CYP3A4 Inhibitors (Strong) may increase the serum concentration of Zuranolone. Management: Reduce the zuranolone dose to 30 mg once daily when used concomitantly with a strong CYP3A4 inhibitor. Risk D: Consider therapy modification
See individual agents.
Use of this combination for the eradication of H. pylori infection is not recommended during the first trimester of pregnancy (Nguyen 2019). Refer to individual monographs for additional information.
Amoxicillin, clarithromycin, and omeprazole are 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. Refer to individual monographs for additional information.
Hepatic function; magnesium (baseline and periodically thereafter; especially if taking concomitant digoxin, diuretics, or other drugs known to cause hypomagnesemia), calcium (baseline and periodically in patients at risk [eg, hypoparathyroidism]); vitamin D levels in patients at risk for fractures or who are receiving prolonged proton pump inhibitor therapy; susceptibility testing is recommended in patients who fail H. pylori-eradication regimen
Omeprazole: A proton pump inhibitor, suppresses gastric acid secretion via inhibition of the parietal cell H+/K+ ATP pump.
Clarithromycin: An antibacterial agent, binds to the 50s ribosomal subunit of susceptible microorganisms resulting in inhibition of protein synthesis.
Amoxicillin: An antibacterial agent, inhibits bacterial cell wall synthesis.
See individual agents.
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