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Bexarotene (systemic): Drug information

Bexarotene (systemic): Drug information
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For additional information see "Bexarotene (systemic): Patient drug information"

For abbreviations, symbols, and age group definitions show table
ALERT: US Boxed Warning
Pregnancy:

Bexarotene (oral) is a member of the retinoid class of drugs that is associated with birth defects in humans. Bexarotene (oral) also caused birth defects when administered orally to pregnant rats. Bexarotene (oral) must not be administered to a pregnant woman.

Brand Names: US
  • Targretin
Pharmacologic Category
  • Antineoplastic Agent, Retinoic Acid Derivative
Dosing: Adult
Cutaneous T-cell lymphoma, refractory

Cutaneous T-cell lymphoma, refractory: Oral: Initial: 300 mg/m2 once daily taken as a single daily dose; if well tolerated, but no tumor response after 8 weeks, may increase to 400 mg/m2 once daily (Ref); continue as long as clinical benefit is demonstrated (bexarotene was administered in studies for up to 97 weeks).

Consensus recommendations (off-label dosing): Initial: 150 mg/m2 once daily; if lab work remains stable for at least 4 weeks, increase to 300 mg/m2/day. In patients with unstable lipids or other bexarotene toxicities, may increase in 75 mg/day increments every 2 to 4 weeks up to 300 mg/m2/day. Reduce dose in 75 mg/day decrements for toxicity. Continue until disease progression or unacceptable toxicity. Response may take up to 6 months; loss of response may require dose escalation or adjuvant therapy (Ref). Refer to consensus recommendations for further details.

Cutaneous anaplastic large cell lymphoma (off-label dosing): Target dose (in patients who are unable to tolerate or are refractory to methotrexate): 300 mg/m2/day for up to 48 weeks or until disease progression or unacceptable toxicity (Ref).

Mycosis fungoides/Sezary syndrome, refractory/resistant (off-label dosing): Induction: 150 mg/day for 1 to 2 months or 225 or 300 mg/day for 1 month, followed by maintenance therapy of 150 to 300 mg/day for 11 months. Bexarotene is administered in combination with varying schedules of PUVA; refer to protocol for further bexarotene and PUVA dosing details (Ref).

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

Dosing: Kidney Impairment: Adult

There are no dosage adjustments provided in the manufacturer's labeling (has not been studied); however, although renal elimination is a minor excretion pathway, renal insufficiency may result in significant protein binding changes and alter pharmacokinetics of bexarotene.

Dosing: Liver Impairment: Adult

Hepatic impairment at baseline: There are no dosage adjustments provided in the manufacturer's labeling (has not been studied); however, hepatic impairment would be expected to result in decreased clearance of bexarotene due to the extensive hepatic contribution to elimination.

Hepatotoxicity during treatment: If AST, ALT, or bilirubin >3 times ULN, consider withholding or discontinuing therapy.

Dosing: Obesity: Adult

American Society of Clinical Oncology guidelines for appropriate systemic therapy dosing in adults with cancer with a BMI ≥30 kg/m2 : Utilize patient's actual body weight (full weight) for calculation of BSA- or weight-based dosing; manage regimen-related toxicities in the same manner as for patients with a BMI <30 kg/m2; if a dose reduction is utilized due to toxicity, may consider resumption of full weight-based dosing (or previously tolerated dose level) with subsequent cycles only if dose escalations are allowed in the prescribing information, if contributing underlying factors (eg, hepatic or kidney impairment) are sufficiently resolved, AND if performance status has markedly improved or is considered adequate (Ref).

Dosing: Adjustment for Toxicity: Adult

If necessitated by toxicity, may decrease dose from 300 mg/m2/day to 200 mg/m2/day, then to 100 mg/m2/day, or temporarily hold. Upon recovery, may titrate dose upward with careful monitoring.

Hypertriglyceridemia: Consider dose reduction, treatment interruption, and or antilipemic therapy.

Leukopenia and neutropenia: Leukopenia and neutropenia resolved after dose reduction or discontinuation.

Dosing: Older Adult

Refer to adult dosing.

Adverse Reactions

The following adverse drug reactions and incidences are derived from product labeling unless otherwise specified.

Frequency not always defined.

>10%:

Cardiovascular: Peripheral edema (11% to 13%)

Central nervous system: Headache (30% to 42%), chills (10% to 13%), insomnia (5% to 11%)

Dermatologic: Exfoliative dermatitis (10% to 28%), skin rash (17% to 23%), xeroderma (9% to 11%), alopecia (4% to 11%)

Endocrine & metabolic: Hyperlipidemia (79%), hypercholesterolemia (32% to 62%), hypothyroidism (29% to 53%), increased lactate dehydrogenase (7% to 13%)

Gastrointestinal: Diarrhea (7% to 42%), anorexia (2% to 23%), nausea (8% to 16%), vomiting (4% to 13%), abdominal pain (4% to 11%)

Hematologic & oncologic: Leukopenia (17% to 47%), anemia (6% to 25%), hypochromic anemia (4% to 13%)

Infection: Infection (13% to 23%; bacterial infection: 1% to 13%)

Neuromuscular & skeletal: Weakness (20% to 45%), back pain (2% to 11%)

Respiratory: Flu-like symptoms (4% to 13%)

Miscellaneous: Fever (5% to 17%)

1% to 10%:

Cardiovascular: Angina pectoris, cardiac failure (right), cerebrovascular accident, chest pain, hypertension, subdural hematoma, syncope, tachycardia

Central nervous system: Agitation, ataxia, confusion, depression, dizziness, hyperesthesia, myasthenia, neuropathy

Dermatologic: Acne vulgaris, allergic skin reaction, cellulitis, cheilitis, cutaneous nodule, maculopapular rash, skin photosensitivity, pustular rash, skin rash, sunburn, vesiculobullous dermatitis

Endocrine & metabolic: Albuminuria, hyperglycemia, weight gain, weight loss

Gastrointestinal: Colitis, constipation, dyspepsia, flatulence, gastroenteritis, gingivitis, increased serum amylase, melena, pancreatitis, xerostomia

Genitourinary: Dysuria, hematuria, mastalgia, urinary incontinence, urinary tract infection, urinary urgency

Hematologic & oncologic: Acquired blood coagulation disorder, eosinophilia, hemorrhage, hypoproteinemia, lymphocytosis, thrombocythemia, thrombocytopenia

Hepatic: Hepatic failure, increased serum ALT, increased serum AST, increased serum bilirubin

Infection: Candidiasis, sepsis

Neuromuscular & skeletal: Arthralgia, arthrosis, myalgia, ostealgia

Ophthalmic: Blepharitis, cataract (new and worsening), conjunctivitis, corneal lesion, keratitis, visual field defect, xerophthalmia

Otic: Otalgia, otitis externa

Renal: Increased serum creatinine, renal function abnormality

Respiratory: Bronchitis, cough, dyspnea, hemoptysis, hypoxia, pharyngitis, pleural effusion, pneumonia, pulmonary edema, rhinitis

Miscellaneous: Serous drainage

Contraindications

Known serious hypersensitivity to bexarotene or any component of the formulation; pregnancy.

Warnings/Precautions

Concerns related to adverse effects:

• Hepatotoxicity: Dose-related elevations in ALT, AST, and bilirubin have been reported; cases of cholestasis and liver failure (fatal) have occurred. Monitor for liver function test abnormalities and temporarily withhold or discontinue if ALT, AST, or bilirubin are >3 times the ULN. Liver function test elevations resolved within 1 month in most patients following dose reduction or discontinuation.

• Hypothyroidism: Bexarotene is associated with a rapid and profound suppression of thyrotropin, which may commonly lead to hypothyroidism (Burch 2019). Bexarotene rapidly suppresses thyroid-stimulating hormone (TSH) levels by directly inhibiting TSH secretion, and also affects thyroid hormone metabolism (Hamnvik 2011). Reductions in total T4 and TSH are reversible. Hypothyroidism commonly occurs. Monitor thyroid functions tests, including free T4 levels at baseline and during treatment. Levothyroxine therapy should be initiated when oral bexarotene is initiated (use low-dose levothyroxine in patients with cardiovascular disease [CVD]); patients already receiving thyroid hormone therapy may require increased thyroid hormone doses to achieve therapeutic levels (Hamnvik 2011; Scarisbrick 2013). Withhold levothyroxine if bexarotene is withheld; if bexarotene is permanently discontinued, stop levothyroxine (or revert back to doses used prior to bexarotene therapy) (Scarisbrick 2013). Recovery of thyroid function generally occurs within weeks of bexarotene discontinuation (Burch 2019).

• Leukopenia: Grade 1 to 3 leukopenia has occurred (predominantly as neutropenia); the incidence is higher with doses >300 mg/m2/day. The onset of leukopenia was generally 4 to 8 weeks. Grade 3 and 4 neutropenia have occurred. Leukopenia and neutropenia typically resolved within 30 days after discontinuation or dose reduction. Monitor CBC with differential at baseline and periodically during treatment. Leukopenia and neutropenia were rarely associated with severe conditions or serious adverse events.

• Lipid abnormalities: Bexarotene induces significant lipid abnormalities in a majority of patients (increased triglycerides and total cholesterol as well as decreased high-density lipoprotein cholesterol); the onset is usually within 2 to 4 weeks; effects are reversible on discontinuation or generally mitigated by dose reduction and/or antilipemic therapy. Initiate low-fat diet (<30% of calories from fat with saturated fats <10%) (Scarisbrick 2013). Monitor fasting lipid panel; may require dose reduction, treatment interruption, and/or concomitant antilipemic therapy. Fasting triglycerides should be normal (or normalized with appropriate therapy) prior to initiation; triglycerides should be maintained <400 mg/dL. Optimize lipids prior to bexarotene initiation in patients with preexisting CVD, type 2 diabetes, or a CVD risk >20%; otherwise, initiate lipid-lowering therapy with an appropriate agent that does not have potential drug interactions (Scarisbrick 2013). In studies, HMG-CoA reductase inhibitors were used to manage lipids; gemfibrozil is not recommended due to potential for drug interactions. If bexarotene therapy is withheld, lipid-lowering therapy may be continued; if bexarotene is permanently discontinued, discontinue lipid-lowering therapy or revert back to lipid-lowering therapy doses used prior to bexarotene therapy (Scarisbrick 2013).

• Pancreatitis: Pancreatitis (acute) associated with hypertriglyceridemia has been reported. Interrupt treatment and evaluate if pancreatitis is suspected. Cutaneous T-cell lymphoma patients with risk factors for pancreatitis (eg, prior pancreatitis, uncontrolled hyperlipidemia, excessive ethanol consumption, uncontrolled diabetes, biliary tract disease, concomitant medications causing hyperlipidemia or concomitant medications associated with pancreatic toxicity) may be at increased risk for bexarotene-associated pancreatitis.

• Photosensitivity: Retinoids are associated with photosensitivity; phototoxicity (sunburn, sunlight sensitivity) has occurred with bexarotene when patients were exposed to direct sunlight. Advise patients to minimize exposure to sunlight and artificial ultraviolet light during treatment. The use of a high-factor sunscreen is recommended (Scarisbrick 2013).

• Visual disturbances: Any new visual abnormalities experienced by the patient should be evaluated by an ophthalmologist (cataracts may develop or worsen, especially in the geriatric population).

Disease-related concerns:

• Diabetes: Use with caution in patients with diabetes mellitus; may enhance the actions of insulin, sulfonylureas, or thiazolidinediones, resulting in hypoglycemia in patients receiving these agents (hypoglycemia has not been observed with bexarotene monotherapy). Monitor blood glucose as necessary.

• Hepatic impairment: Use with extreme caution in patients with hepatic impairment; bexarotene undergoes extensive hepatic elimination.

Concurrent drug therapy issues:

• Vitamin A: Due to the potential for additive toxicities, patients should be advised to limit additional vitamin A intake (in studies, additional vitamin A was limited to ≤15,000 units/day). Consider avoiding vitamin A supplementation (Scarisbrick 2013).

Special populations:

• Pregnancy: [US Boxed Warning]: Bexarotene is a retinoid, a drug class associated with birth defects in humans; do not administer during pregnancy. Bexarotene caused birth defects when administered orally to pregnant rats.

Dosage form specific issues:

• Propylene glycol: Some dosage forms may contain propylene glycol; large amounts are potentially toxic and have been associated with hyperosmolality, lactic acidosis, seizures, and respiratory depression; use caution (AAP 1997; Zar 2007). See manufacturer's labeling.

Other warnings/precautions:

• Lifestyle modifications: Limit alcohol to <14 units/week (females) or <21 units/week (males) and consider exercise (Scarisbrick 2013).

Dosage Forms: US

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

Capsule, Oral:

Targretin: 75 mg

Generic: 75 mg

Generic Equivalent Available: US

Yes

Pricing: US

Capsules (Bexarotene Oral)

75 mg (per each): $70.62 - $283.57

Capsules (Targretin Oral)

75 mg (per each): $298.50

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

Administration: Adult

Oral: Administer with a meal.

Hazardous Drugs Handling Considerations

Hazardous agent (NIOSH 2024 [table 2]).

Use appropriate precautions for receiving, handling, storage, preparation, dispensing, transporting, administration, and disposal. Follow NIOSH and USP 800 recommendations and institution-specific policies/procedures for appropriate containment strategy (NIOSH 2023; NIOSH 2024; USP-NF 2020).

Note: Facilities may perform risk assessment of some hazardous drugs to determine if appropriate for alternative handling and containment strategies (USP-NF 2020). Refer to institution-specific handling policies/procedures.

Use: Labeled Indications

Cutaneous T-cell lymphoma, refractory: Treatment of cutaneous manifestations of cutaneous T-cell lymphoma in patients who are refractory to at least one prior systemic therapy

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

Bexarotene may be confused with Bexsero, Bextra.

Targretin may be confused with Tagrisso, Tarceva, Targin.

High alert medication:

The Institute for Safe Medication Practices (ISMP) includes this medication among its list of drugs (chemotherapeutic agent parenteral and oral; contraindicated in pregnancy) which have a heightened risk of causing significant patient harm when used in error (High-Alert Medications in Acute Care, Community/Ambulatory Care, and Long-Term Care Settings).

Metabolism/Transport Effects

Substrate of CYP3A4 (Minor); Note: Assignment of Major/Minor substrate status based on clinically relevant drug interaction potential; Induces CYP3A4 (Moderate);

Drug Interactions

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

5-Aminosalicylic Acid Derivatives: May increase myelosuppressive effects of Myelosuppressive Agents. Risk C: Monitor

Abemaciclib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Abemaciclib. Risk X: Avoid

Abiraterone Acetate: CYP3A4 Inducers (Moderate) may decrease serum concentration of Abiraterone Acetate. Risk C: Monitor

Acalabrutinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Acalabrutinib. Risk C: Monitor

ALfentanil: CYP3A4 Inducers (Moderate) may decrease serum concentration of ALfentanil. Management: If concomitant use of alfentanil and moderate CYP3A4 inducers is necessary, consider dosage increase of alfentanil until stable drug effects are achieved. Monitor patients for signs of opioid withdrawal. Risk D: Consider Therapy Modification

Alpelisib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Alpelisib. Risk C: Monitor

ALPRAZolam: CYP3A4 Inducers (Moderate) may decrease serum concentration of ALPRAZolam. Risk C: Monitor

Aminolevulinic Acid (Systemic): Photosensitizing Agents may increase photosensitizing effects of Aminolevulinic Acid (Systemic). Risk X: Avoid

Aminolevulinic Acid (Topical): Photosensitizing Agents may increase photosensitizing effects of Aminolevulinic Acid (Topical). Risk C: Monitor

AmLODIPine: CYP3A4 Inducers (Moderate) may decrease serum concentration of AmLODIPine. Risk C: Monitor

Antihepaciviral Combination Products: CYP3A4 Inducers (Moderate) may decrease serum concentration of Antihepaciviral Combination Products. Risk X: Avoid

Antithyroid Agents: Myelosuppressive Agents may increase neutropenic effects of Antithyroid Agents. Risk C: Monitor

Apremilast: CYP3A4 Inducers (Moderate) may decrease serum concentration of Apremilast. Risk C: Monitor

Aprepitant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Aprepitant. Risk C: Monitor

ARIPiprazole Lauroxil: CYP3A4 Inducers (Moderate) may decrease serum concentration of ARIPiprazole Lauroxil. Risk C: Monitor

ARIPiprazole: CYP3A4 Inducers (Moderate) may decrease serum concentration of ARIPiprazole. Risk C: Monitor

Artemether and Lumefantrine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Artemether and Lumefantrine. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Artemether and Lumefantrine. Specifically, concentrations of dihydroartemisinin (DHA), the active metabolite of artemether may be decreased. Risk C: Monitor

Atazanavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Atazanavir. Risk C: Monitor

Atogepant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Atogepant. Management: For treatment of episodic migraine, the recommended dose of atogepant is 30 mg once daily or 60 mg once daily when combined with CYP3A4 inducers. When used for treatment of chronic migraine, use of atogepant with CYP3A4 inducers should be avoided. Risk D: Consider Therapy Modification

Atorvastatin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Atorvastatin. Risk C: Monitor

Atrasentan: CYP3A4 Inducers (Moderate) may decrease serum concentration of Atrasentan. Risk X: Avoid

Avacopan: CYP3A4 Inducers (Moderate) may decrease serum concentration of Avacopan. Risk X: Avoid

Avanafil: CYP3A4 Inducers (Moderate) may decrease serum concentration of Avanafil. Risk X: Avoid

Avapritinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Avapritinib. Risk X: Avoid

Axitinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Axitinib. Management: Concurrent use of axitinib with a moderate CYP3A4 inducer should be avoided when possible. If any such combination is necessary, monitor for reduced axitinib efficacy. Risk D: Consider Therapy Modification

BCG (Intravesical): Myelosuppressive Agents may decrease therapeutic effects of BCG (Intravesical). Myelosuppressive Agents may increase adverse/toxic effects of BCG (Intravesical). Risk X: Avoid

Bedaquiline: CYP3A4 Inducers (Moderate) may decrease serum concentration of Bedaquiline. CYP3A4 Inducers (Moderate) may increase active metabolite exposure of Bedaquiline. Risk X: Avoid

Belumosudil: CYP3A4 Inducers (Moderate) may decrease serum concentration of Belumosudil. Risk C: Monitor

Benzhydrocodone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Benzhydrocodone. Specifically, the serum concentrations of hydrocodone may be reduced. Risk C: Monitor

Bortezomib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Bortezomib. Risk C: Monitor

Bosutinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Bosutinib. Risk C: Monitor

Brexpiprazole: CYP3A4 Inducers (Moderate) may decrease serum concentration of Brexpiprazole. Risk C: Monitor

Brigatinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Brigatinib. Management: Avoid concurrent use of brigatinib with moderate CYP3A4 inducers when possible. If combined, increase the daily dose of brigatinib in 30 mg increments after 7 days of treatment with the current brigatinib dose, up to maximum of twice the dose. Risk D: Consider Therapy Modification

Buprenorphine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Buprenorphine. Risk C: Monitor

BusPIRone: CYP3A4 Inducers (Moderate) may decrease serum concentration of BusPIRone. Risk C: Monitor

Cabozantinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Cabozantinib. Management: For cabozantinib tablets (Cabometyx), avoid combined use if possible. If combined, increase cabozantinib by 20 mg from previous dose, max 80 mg daily. For cabozantinib capsules (Cometriq), monitor for reduced cabozantinib efficacy if combined. Risk D: Consider Therapy Modification

Calcifediol: CYP3A4 Inducers (Moderate) may decrease serum concentration of Calcifediol. Risk C: Monitor

Calcitriol (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Calcitriol (Systemic). Risk C: Monitor

Cannabis: CYP3A4 Inducers (Moderate) may decrease serum concentration of Cannabis. More specifically, tetrahydrocannabinol and cannabidiol serum concentrations may be decreased. Risk C: Monitor

Capivasertib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Capivasertib. Risk X: Avoid

Capmatinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Capmatinib. Risk X: Avoid

CarBAMazepine: CYP3A4 Inducers (Moderate) may decrease serum concentration of CarBAMazepine. Risk C: Monitor

CARBOplatin: May increase serum concentration of Bexarotene (Systemic). Risk C: Monitor

Cariprazine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Cariprazine. Risk X: Avoid

Ceritinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ceritinib. Risk C: Monitor

Chloramphenicol (Ophthalmic): May increase adverse/toxic effects of Myelosuppressive Agents. Risk C: Monitor

Chloramphenicol (Systemic): Myelosuppressive Agents may increase myelosuppressive effects of Chloramphenicol (Systemic). Risk X: Avoid

Cladribine: May increase myelosuppressive effects of Myelosuppressive Agents. Risk X: Avoid

Clarithromycin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Clarithromycin. CYP3A4 Inducers (Moderate) may increase active metabolite exposure 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

Clindamycin (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Clindamycin (Systemic). Risk C: Monitor

CloZAPine: CYP3A4 Inducers (Moderate) may decrease serum concentration of CloZAPine. Risk C: Monitor

CloZAPine: Myelosuppressive Agents may increase adverse/toxic effects of CloZAPine. Specifically, the risk for neutropenia may be increased. Risk C: Monitor

Cobicistat: CYP3A4 Inducers (Moderate) may decrease serum concentration of Cobicistat. Risk C: Monitor

Cobimetinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Cobimetinib. Risk X: Avoid

Codeine: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Codeine. Risk C: Monitor

Copanlisib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Copanlisib. Risk C: Monitor

Crinecerfont: CYP3A4 Inducers (Moderate) may decrease serum concentration of Crinecerfont. Management: Double the evening dose of crinecerfont and continue the morning dose unchanged during coadministration with moderate CYP3A4 inducers. See full interaction monograph for details. Risk D: Consider Therapy Modification

Crizotinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Crizotinib. Risk C: Monitor

CycloSPORINE (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of CycloSPORINE (Systemic). Risk C: Monitor

Daclatasvir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Daclatasvir. Management: Increase the daclatasvir dose to 90 mg once daily if used with a moderate CYP3A4 inducer. Risk D: Consider Therapy Modification

Dapsone (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Dapsone (Systemic). Risk C: Monitor

Daridorexant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Daridorexant. Risk X: Avoid

Dasabuvir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Dasabuvir. Risk X: Avoid

Dasatinib: CYP3A4 Inducers (Moderate) may increase serum concentration of Dasatinib. Risk C: Monitor

Deferiprone: Myelosuppressive Agents may increase neutropenic effects of Deferiprone. Management: Avoid the concomitant use of deferiprone and myelosuppressive agents whenever possible. If this combination cannot be avoided, monitor the absolute neutrophil count more closely. Risk D: Consider Therapy Modification

Deflazacort: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Deflazacort. Risk X: Avoid

DexAMETHasone (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of DexAMETHasone (Systemic). Risk C: Monitor

DiazePAM: CYP3A4 Inducers (Moderate) may decrease serum concentration of DiazePAM. Risk C: Monitor

Dienogest: CYP3A4 Inducers (Moderate) may decrease serum concentration of Dienogest. Risk C: Monitor

DilTIAZem: CYP3A4 Inducers (Moderate) may decrease serum concentration of DilTIAZem. Risk C: Monitor

Disopyramide: CYP3A4 Inducers (Moderate) may decrease serum concentration of Disopyramide. Risk C: Monitor

Doravirine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Doravirine. Risk C: Monitor

DOXOrubicin (Conventional): CYP3A4 Inducers (Moderate) may decrease serum concentration of DOXOrubicin (Conventional). Risk X: Avoid

DroNABinol: CYP3A4 Inducers (Moderate) may decrease serum concentration of DroNABinol. Risk C: Monitor

Dronedarone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Dronedarone. Risk C: Monitor

Duvelisib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Duvelisib. Management: Avoid if possible. If used, on day 12 of combination increase duvelisib from 25 mg twice daily to 40 mg twice daily or from 15 mg twice daily to 25 mg twice daily. Resume prior duvelisib dose 14 days after stopping moderate CYP3A4 inducer. Risk D: Consider Therapy Modification

Dydrogesterone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Dydrogesterone. Risk C: Monitor

Efavirenz: CYP3A4 Inducers (Moderate) may decrease serum concentration of Efavirenz. Risk C: Monitor

Elacestrant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Elacestrant. Risk X: Avoid

Elbasvir and Grazoprevir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Elbasvir and Grazoprevir. Risk X: Avoid

Elexacaftor, Tezacaftor, and Ivacaftor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Elexacaftor, Tezacaftor, and Ivacaftor. Risk C: Monitor

Eliglustat: CYP3A4 Inducers (Moderate) may decrease serum concentration of Eliglustat. Risk C: Monitor

Encorafenib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Encorafenib. Risk C: Monitor

Ensartinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ensartinib. Risk X: Avoid

Entrectinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Entrectinib. Risk X: Avoid

Enzalutamide: CYP3A4 Inducers (Moderate) may decrease serum concentration of Enzalutamide. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Enzalutamide. Risk C: Monitor

Erdafitinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Erdafitinib. Management: If a moderate CYP3A4 inducer must be used at the start of erdafitinib, administer erdafitinib at a dose of 9 mg daily. If a moderate CYP3A4 inducer is discontinued, continue erdafitinib at the same dose unless there is evidence of drug toxicity. Risk D: Consider Therapy Modification

Erlotinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Erlotinib. Management: Avoid the combination of erlotinib and strong CYP3A4 inducers whenever possible. If this combination must be used, increase erlotinib dose by 50 mg increments every 2 weeks as tolerated, to a maximum of 450 mg/day. Risk D: Consider Therapy Modification

Estrogen Derivatives: CYP3A4 Inducers (Moderate) may decrease serum concentration of Estrogen Derivatives. Risk C: Monitor

Etoposide Phosphate: CYP3A4 Inducers (Moderate) may decrease serum concentration of Etoposide Phosphate. Risk C: Monitor

Etoposide: CYP3A4 Inducers (Moderate) may decrease serum concentration of Etoposide. Risk C: Monitor

Etravirine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Etravirine. Risk C: Monitor

Everolimus: CYP3A4 Inducers (Moderate) may decrease serum concentration of Everolimus. Risk C: Monitor

Exemestane: CYP3A4 Inducers (Moderate) may decrease serum concentration of Exemestane. Risk C: Monitor

Fedratinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Fedratinib. Risk X: Avoid

Felodipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Felodipine. Risk C: Monitor

FentaNYL: CYP3A4 Inducers (Moderate) may decrease serum concentration of FentaNYL. Risk C: Monitor

Fexinidazole: CYP3A4 Inducers (Moderate) may increase active metabolite exposure of Fexinidazole. Risk X: Avoid

Fexinidazole: Myelosuppressive Agents may increase myelosuppressive effects of Fexinidazole. Risk X: Avoid

Finerenone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Finerenone. Risk X: Avoid

Flibanserin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Flibanserin. Risk X: Avoid

Fosamprenavir: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Fosamprenavir. Risk C: Monitor

Fosaprepitant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Fosaprepitant. Specifically, CYP3A4 Inducers (Moderate) may decrease serum concentrations of the active metabolite aprepitant. Risk C: Monitor

Fosnetupitant: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Fosnetupitant. Risk C: Monitor

Fostamatinib: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Fostamatinib. Risk C: Monitor

Fruquintinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Fruquintinib. Management: Avoid this combination when possible. If combined, continue the same fruquintinib dose, but monitor for reduced fruquintinib efficacy. Risk D: Consider Therapy Modification

Ganaxolone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ganaxolone. Management: Avoid concomitant use of ganaxolone and moderate CYP3A4 inducers whenever possible. If combined, consider increasing the dose of ganaxolone, but do not exceed the maximum recommended daily dose. Risk D: Consider Therapy Modification

Gefitinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Gefitinib. Risk C: Monitor

Gemfibrozil: May increase serum concentration of Bexarotene (Systemic). Risk X: Avoid

Gemigliptin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Gemigliptin. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Gemigliptin. Risk C: Monitor

Gepirone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Gepirone. Risk C: Monitor

Gepotidacin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Gepotidacin. Risk C: Monitor

Glasdegib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Glasdegib. Management: Avoid use of glasdegib and moderate CYP3A4 inducers whenever possible. If combined, increase glasdegib dose from 100 mg daily to 200 mg daily or from 50 mg daily to 100 mg daily. Resume previous glasdegib dose 7 days after discontinuation of the inducer. Risk D: Consider Therapy Modification

Glecaprevir and Pibrentasvir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Glecaprevir and Pibrentasvir. Risk C: Monitor

GuanFACINE: CYP3A4 Inducers (Moderate) may decrease serum concentration of GuanFACINE. Management: Increase extended-release guanfacine dose by up to double when initiating guanfacine in patients taking CYP3A4 inducers or if initiating a CYP3A4 inducer in a patient already taking extended-release guanfacine. Monitor for reduced guanfacine efficacy. Risk D: Consider Therapy Modification

Hormonal Contraceptives: CYP3A4 Inducers (Moderate) may decrease serum concentration of Hormonal Contraceptives. Management: Advise patients to use an alternative method of contraception or a back-up method during coadministration, and to continue back-up contraception for 28 days after discontinuing a moderate CYP3A4 inducer to ensure contraceptive reliability. Risk D: Consider Therapy Modification

HYDROcodone: CYP3A4 Inducers (Moderate) may decrease serum concentration of HYDROcodone. Risk C: Monitor

Hydrocortisone (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Hydrocortisone (Systemic). Risk C: Monitor

Ibrexafungerp: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ibrexafungerp. Risk X: Avoid

Ibrutinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ibrutinib. Risk C: Monitor

Idelalisib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Idelalisib. Risk C: Monitor

Ifosfamide: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Ifosfamide. CYP3A4 Inducers (Moderate) may increase active metabolite exposure of Ifosfamide. Risk C: Monitor

Imatinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Imatinib. Risk C: Monitor

Indinavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Indinavir. Management: Consider avoiding the combination of indinavir and moderate CYP3A4 inducers whenever possible due to the risk for decreased indinavir concentrations, reduced efficacy, and development of resistance. If combined, monitor for indinavir treatment failure. Risk D: Consider Therapy Modification

Irinotecan Products: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Irinotecan Products. Specifically, concentrations of SN-38 may be reduced. Risk C: Monitor

Isavuconazonium Sulfate: CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Isavuconazonium Sulfate. Specifically, CYP3A4 Inducers (Moderate) may decrease isavuconazole serum concentrations. Risk C: Monitor

Isradipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Isradipine. Risk C: Monitor

Istradefylline: CYP3A4 Inducers (Moderate) may decrease serum concentration of Istradefylline. Risk C: Monitor

Itraconazole: CYP3A4 Inducers (Moderate) may decrease serum concentration of Itraconazole. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Itraconazole. Risk C: Monitor

Ivabradine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ivabradine. Risk X: Avoid

Ivacaftor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ivacaftor. Risk C: Monitor

Ixabepilone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ixabepilone. Risk C: Monitor

Ixazomib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ixazomib. Risk C: Monitor

Ketamine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ketamine. Risk C: Monitor

Ketoconazole (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Ketoconazole (Systemic). Risk C: Monitor

Lapatinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lapatinib. Risk C: Monitor

Larotrectinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Larotrectinib. Management: Double the larotrectinib dose if used together with a moderate CYP3A4 inducer. Following discontinuation of the moderate CYP3A4 inducer, resume the previous dose of larotrectinib after a period of 3 to 5 times the inducer's half-life. Risk D: Consider Therapy Modification

Lazertinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lazertinib. Risk X: Avoid

Lefamulin (Intravenous): CYP3A4 Inducers (Moderate) may decrease serum concentration of Lefamulin (Intravenous). Management: Avoid concomitant use of lefamulin (intravenous) with moderate CYP3A4 inducers unless the benefits outweigh the risks. Risk D: Consider Therapy Modification

Lefamulin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lefamulin. Management: Avoid concomitant use of lefamulin with moderate CYP3A4 inducers unless the benefits outweigh the risks. Risk D: Consider Therapy Modification

Lemborexant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lemborexant. Risk X: Avoid

Lenacapavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lenacapavir. Risk X: Avoid

Leniolisib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Leniolisib. Risk X: Avoid

Lercanidipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lercanidipine. Risk C: Monitor

Levamlodipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Levamlodipine. Risk C: Monitor

Levoketoconazole: CYP3A4 Inducers (Moderate) may decrease serum concentration of Levoketoconazole. Risk C: Monitor

Levomethadone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Levomethadone. Risk C: Monitor

LinaGLIPtin: CYP3A4 Inducers (Moderate) may decrease serum concentration of LinaGLIPtin. Risk C: Monitor

Linezolid: May increase myelosuppressive effects of Myelosuppressive Agents. Risk C: Monitor

Lonafarnib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lonafarnib. Risk X: Avoid

Lopinavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lopinavir. Risk C: Monitor

Lorlatinib: CYP3A4 Inducers (Moderate) may increase hepatotoxic effects of Lorlatinib. CYP3A4 Inducers (Moderate) may decrease serum concentration of Lorlatinib. Management: Avoid use of lorlatinib with moderate CYP3A4 inducers. If such a combination must be used, increase lorlatinib to 125 mg daily. Monitor for reduced lorlatinib efficacy and consider closer monitoring of AST, ALT, and bilirubin. Risk D: Consider Therapy Modification

Lovastatin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lovastatin. Risk C: Monitor

Lumacaftor and Ivacaftor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lumacaftor and Ivacaftor. Risk C: Monitor

Lumateperone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lumateperone. Risk X: Avoid

Lurasidone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Lurasidone. Management: After chronic treatment (7 days or more) with a moderate CYP3A4 inducer, lurasidone dose increases may be needed. Monitor closely for decreased lurasidone effects and increase the lurasidone dose as needed. Risk D: Consider Therapy Modification

Macitentan: CYP3A4 Inducers (Moderate) may decrease serum concentration of Macitentan. Risk C: Monitor

Maraviroc: CYP3A4 Inducers (Moderate) may decrease serum concentration of Maraviroc. Management: Increase maraviroc adult dose to 600 mg twice/day, but only if not receiving a strong CYP3A4 inhibitor. Not recommended for pediatric patients not also receiving a strong CYP3A4 inhibitor. Contraindicated in patients with CrCl less than 30 mL/min. Risk D: Consider Therapy Modification

Maribavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Maribavir. Risk C: Monitor

Mavacamten: CYP3A4 Inducers (Moderate) may decrease serum concentration of Mavacamten. Risk X: Avoid

Mavorixafor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Mavorixafor. Risk C: Monitor

Mefloquine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Mefloquine. Risk C: Monitor

Meperidine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Meperidine. CYP3A4 Inducers (Moderate) may increase active metabolite exposure of Meperidine. Specifically, concentrations of normeperidine, the CNS stimulating metabolite, may be increased. Risk C: Monitor

Methadone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Methadone. Risk C: Monitor

Methotrexate: Retinoic Acid Derivatives may increase hepatotoxic effects of Methotrexate. Risk C: Monitor

Methoxsalen (Systemic): Photosensitizing Agents may increase photosensitizing effects of Methoxsalen (Systemic). Risk C: Monitor

MethylPREDNISolone: CYP3A4 Inducers (Moderate) may decrease serum concentration of MethylPREDNISolone. Risk C: Monitor

Mianserin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Mianserin. Risk C: Monitor

Midazolam: CYP3A4 Inducers (Moderate) may decrease serum concentration of Midazolam. Risk C: Monitor

Midostaurin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Midostaurin. Risk C: Monitor

MiFEPRIStone: CYP3A4 Inducers (Moderate) may decrease serum concentration of MiFEPRIStone. Management: Avoid combined use in patients treated for Cushing's disease. When used for pregnancy termination, mifepristone efficacy may be reduced and an alternative pregnancy termination procedure may be warranted. Ensure a follow-up assessment after combined use. Risk D: Consider Therapy Modification

Mirodenafil: CYP3A4 Inducers (Moderate) may decrease serum concentration of Mirodenafil. Risk C: Monitor

Mitapivat: CYP3A4 Inducers (Moderate) may decrease serum concentration of Mitapivat. Management: Consider alternatives to this combination when possible. If combined, monitor hemoglobin and titrate mitapivat beyond 50 mg twice daily, if needed, but do not exceed doses of 100 mg twice daily. Risk D: Consider Therapy Modification

Mobocertinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Mobocertinib. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Mobocertinib. Risk X: Avoid

Montelukast: CYP3A4 Inducers (Moderate) may decrease serum concentration of Montelukast. Risk C: Monitor

Multivitamins/Fluoride (with ADE): May increase adverse/toxic effects of Retinoic Acid Derivatives. Risk X: Avoid

Multivitamins/Minerals (with ADEK, Folate, Iron): May increase adverse/toxic effects of Retinoic Acid Derivatives. Risk X: Avoid

Multivitamins/Minerals (with AE, No Iron): May increase adverse/toxic effects of Retinoic Acid Derivatives. Risk X: Avoid

Naldemedine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Naldemedine. Risk C: Monitor

Naloxegol: CYP3A4 Inducers (Moderate) may decrease serum concentration of Naloxegol. Risk C: Monitor

Nelfinavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Nelfinavir. Risk C: Monitor

Neratinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Neratinib. Risk X: Avoid

Netupitant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Netupitant. Risk C: Monitor

Nevirapine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Nevirapine. Risk C: Monitor

NIFEdipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of NIFEdipine. Risk C: Monitor

Nilotinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Nilotinib. Risk C: Monitor

Nilvadipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Nilvadipine. Risk C: Monitor

NiMODipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of NiMODipine. Risk C: Monitor

Nirmatrelvir and Ritonavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Nirmatrelvir and Ritonavir. Risk C: Monitor

Nirogacestat: CYP3A4 Inducers (Moderate) may decrease serum concentration of Nirogacestat. Risk X: Avoid

Nisoldipine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Nisoldipine. Risk X: Avoid

Olaparib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Olaparib. Risk X: Avoid

Oliceridine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Oliceridine. Risk C: Monitor

Olmutinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Olmutinib. Risk C: Monitor

Olutasidenib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Olutasidenib. Risk X: Avoid

Omaveloxolone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Omaveloxolone. Risk X: Avoid

Osimertinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Osimertinib. Risk C: Monitor

OxyCODONE: CYP3A4 Inducers (Moderate) may decrease serum concentration of OxyCODONE. Risk C: Monitor

PACLitaxel (Conventional): May increase serum concentration of Bexarotene (Systemic). Bexarotene (Systemic) may decrease serum concentration of PACLitaxel (Conventional). Risk C: Monitor

PACLitaxel (Protein Bound): Bexarotene (Systemic) may decrease serum concentration of PACLitaxel (Protein Bound). PACLitaxel (Protein Bound) may increase serum concentration of Bexarotene (Systemic). Risk C: Monitor

Pacritinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Pacritinib. Risk C: Monitor

Palbociclib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Palbociclib. Risk C: Monitor

Paliperidone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Paliperidone. Risk C: Monitor

Palovarotene: CYP3A4 Inducers (Moderate) may decrease serum concentration of Palovarotene. Risk X: Avoid

PAZOPanib: CYP3A4 Inducers (Moderate) may decrease serum concentration of PAZOPanib. Risk C: Monitor

Pemigatinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Pemigatinib. Risk X: Avoid

Perampanel: CYP3A4 Inducers (Moderate) may decrease serum concentration of Perampanel. Management: Increase perampanel starting dose to 4 mg/day if used with moderate CYP3A4 inducers. Increase perampanel dose by 2 mg/day no more than once weekly based on response and tolerability. Dose adjustments may be needed if the inducer is discontinued. Risk D: Consider Therapy Modification

Pimavanserin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Pimavanserin. Risk X: Avoid

Piperaquine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Piperaquine. Risk C: Monitor

Pirtobrutinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Pirtobrutinib. Management: Avoid concomitant use if possible. If combined, if the current pirtobrutinib dose is 200 mg once daily, increase to 300 mg once daily. If current pirtobrutinib dose is 50 mg or 100 mg once daily, increase the dose by 50 mg. Risk D: Consider Therapy Modification

PONATinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of PONATinib. Risk C: Monitor

Porfimer: Photosensitizing Agents may increase photosensitizing effects of Porfimer. Risk X: Avoid

Pralsetinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Pralsetinib. Management: If this combo cannot be avoided, increase pralsetinib dose from 400 mg daily to 600 mg daily; from 300 mg daily to 500 mg daily; and from 200 mg daily to 300 mg daily. Risk D: Consider Therapy Modification

Praziquantel: CYP3A4 Inducers (Moderate) may decrease serum concentration of Praziquantel. Management: Consider alternatives to this combination whenever possible. If combined, monitor closely for reduced praziquantel efficacy. If possible, stop the moderate CYP3A4 inducer 2 to 4 weeks before praziquantel initiation. Risk D: Consider Therapy Modification

PrednisoLONE (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of PrednisoLONE (Systemic). Risk C: Monitor

PredniSONE: CYP3A4 Inducers (Moderate) may decrease serum concentration of PredniSONE. Risk C: Monitor

Pretomanid: CYP3A4 Inducers (Moderate) may decrease serum concentration of Pretomanid. Risk X: Avoid

Promazine: May increase myelosuppressive effects of Myelosuppressive Agents. Risk C: Monitor

QUEtiapine: CYP3A4 Inducers (Moderate) may decrease serum concentration of QUEtiapine. Risk C: Monitor

QuiNIDine: CYP3A4 Inducers (Moderate) may decrease serum concentration of QuiNIDine. Risk C: Monitor

QuiNINE: CYP3A4 Inducers (Moderate) may decrease serum concentration of QuiNINE. Risk C: Monitor

Quizartinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Quizartinib. Risk X: Avoid

Ranolazine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ranolazine. Risk X: Avoid

Regorafenib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Regorafenib. CYP3A4 Inducers (Moderate) may increase active metabolite exposure of Regorafenib. Risk C: Monitor

Repaglinide: CYP3A4 Inducers (Moderate) may decrease serum concentration of Repaglinide. Risk C: Monitor

Repotrectinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Repotrectinib. Risk X: Avoid

Revumenib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Revumenib. Risk X: Avoid

Ribociclib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ribociclib. Risk C: Monitor

Rilpivirine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Rilpivirine. Risk C: Monitor

Rimegepant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Rimegepant. Risk X: Avoid

Ripretinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ripretinib. Management: Avoid this combination if possible. If concomitant use is required, increase ripretinib to 150 mg twice daily. Decrease ripretinib to 150 mg once daily 14 days after stopping a moderate CYP3A4 inducer. Monitor patients for ripretinib response and toxicity Risk D: Consider Therapy Modification

RisperiDONE: CYP3A4 Inducers (Moderate) may decrease serum concentration of RisperiDONE. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of RisperiDONE. Risk C: Monitor

Ritlecitinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ritlecitinib. Risk C: Monitor

Ritonavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ritonavir. Risk C: Monitor

Roflumilast (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Roflumilast (Systemic). CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Roflumilast (Systemic). Risk C: Monitor

Rolapitant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Rolapitant. Risk C: Monitor

Ropeginterferon Alfa-2b: Myelosuppressive Agents may increase myelosuppressive effects of Ropeginterferon Alfa-2b. Management: Avoid coadministration of ropeginterferon alfa-2b and other myelosuppressive agents. If this combination cannot be avoided, monitor patients for excessive myelosuppressive effects. Risk D: Consider Therapy Modification

Samidorphan: CYP3A4 Inducers (Moderate) may decrease serum concentration of Samidorphan. Risk C: Monitor

Saquinavir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Saquinavir. Risk C: Monitor

Selpercatinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Selpercatinib. Risk X: Avoid

Selumetinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Selumetinib. Risk X: Avoid

Sertraline: CYP3A4 Inducers (Moderate) may decrease serum concentration of Sertraline. Risk C: Monitor

Sildenafil: CYP3A4 Inducers (Moderate) may decrease serum concentration of Sildenafil. Risk C: Monitor

Simeprevir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Simeprevir. Risk X: Avoid

Simvastatin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Simvastatin. Risk C: Monitor

Sirolimus (Conventional): CYP3A4 Inducers (Moderate) may decrease serum concentration of Sirolimus (Conventional). Risk C: Monitor

Sirolimus (Protein Bound): CYP3A4 Inducers (Moderate) may decrease serum concentration of Sirolimus (Protein Bound). Risk C: Monitor

Sonidegib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Sonidegib. Risk X: Avoid

SORAfenib: CYP3A4 Inducers (Moderate) may decrease serum concentration of SORAfenib. Risk C: Monitor

Sotorasib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Sotorasib. Risk C: Monitor

Sparsentan: CYP3A4 Inducers (Moderate) may decrease serum concentration of Sparsentan. Risk C: Monitor

SUFentanil: CYP3A4 Inducers (Moderate) may decrease serum concentration of SUFentanil. Risk C: Monitor

SUNItinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of SUNItinib. Risk C: Monitor

Suvorexant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Suvorexant. Risk C: Monitor

Suzetrigine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Suzetrigine. Risk X: Avoid

Tacrolimus (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Tacrolimus (Systemic). Risk C: Monitor

Tadalafil: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tadalafil. Risk C: Monitor

Tamoxifen: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tamoxifen. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Tamoxifen. Risk C: Monitor

Tasimelteon: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tasimelteon. Risk C: Monitor

Tazemetostat: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tazemetostat. Risk X: Avoid

Temsirolimus: CYP3A4 Inducers (Moderate) may decrease serum concentration of Temsirolimus. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Temsirolimus. Specifically, sirolimus concentrations may be decreased. Risk C: Monitor

Teniposide: CYP3A4 Inducers (Moderate) may decrease serum concentration of Teniposide. Risk C: Monitor

Tetracyclines: May increase adverse/toxic effects of Retinoic Acid Derivatives. The development of pseudotumor cerebri is of particular concern. Risk X: Avoid

Tetrahydrocannabinol and Cannabidiol: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tetrahydrocannabinol and Cannabidiol. Risk C: Monitor

Tetrahydrocannabinol: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tetrahydrocannabinol. Risk C: Monitor

Tezacaftor and Ivacaftor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tezacaftor and Ivacaftor. Risk C: Monitor

Thiotepa: CYP3A4 Inducers (Moderate) may increase active metabolite exposure of Thiotepa. CYP3A4 Inducers (Moderate) may decrease serum concentration of Thiotepa. Risk C: Monitor

Ticagrelor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ticagrelor. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Ticagrelor. Risk C: Monitor

Tivozanib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tivozanib. Risk C: Monitor

Tofacitinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tofacitinib. Risk C: Monitor

Tolvaptan: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tolvaptan. Risk C: Monitor

Toremifene: CYP3A4 Inducers (Moderate) may decrease serum concentration of Toremifene. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Toremifene. Risk C: Monitor

Trabectedin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Trabectedin. Risk C: Monitor

TraMADol: CYP3A4 Inducers (Moderate) may decrease serum concentration of TraMADol. Risk C: Monitor

TraZODone: CYP3A4 Inducers (Moderate) may decrease serum concentration of TraZODone. Risk C: Monitor

Tretinoin (Systemic): CYP3A4 Inducers (Moderate) may decrease serum concentration of Tretinoin (Systemic). Risk C: Monitor

Triazolam: CYP3A4 Inducers (Moderate) may decrease serum concentration of Triazolam. Risk C: Monitor

Tucatinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Tucatinib. Risk C: Monitor

Ubrogepant: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ubrogepant. Management: Use an initial ubrogepant dose of 100 mg and second dose (if needed) of 100 mg when used with a moderate CYP3A4 inducer. Risk D: Consider Therapy Modification

Ulipristal: CYP3A4 Inducers (Moderate) may decrease serum concentration of Ulipristal. Risk X: Avoid

Upadacitinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Upadacitinib. Risk C: Monitor

Valbenazine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Valbenazine. CYP3A4 Inducers (Moderate) may decrease active metabolite exposure of Valbenazine. Risk C: Monitor

Vandetanib: CYP3A4 Inducers (Moderate) may increase active metabolite exposure of Vandetanib. CYP3A4 Inducers (Moderate) may decrease serum concentration of Vandetanib. Risk C: Monitor

Vanzacaftor, Tezacaftor, and Deutivacaftor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Vanzacaftor, Tezacaftor, and Deutivacaftor. Risk X: Avoid

Velpatasvir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Velpatasvir. Risk X: Avoid

Vemurafenib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Vemurafenib. Risk C: Monitor

Venetoclax: CYP3A4 Inducers (Moderate) may decrease serum concentration of Venetoclax. Risk X: Avoid

Verapamil: CYP3A4 Inducers (Moderate) may decrease serum concentration of Verapamil. Risk C: Monitor

Verteporfin: Photosensitizing Agents may increase photosensitizing effects of Verteporfin. Risk C: Monitor

Vilazodone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Vilazodone. Risk C: Monitor

VinCRIStine: CYP3A4 Inducers (Moderate) may decrease serum concentration of VinCRIStine. Risk C: Monitor

Vitamin A: May increase adverse/toxic effects of Retinoic Acid Derivatives. Risk X: Avoid

Voclosporin: CYP3A4 Inducers (Moderate) may decrease serum concentration of Voclosporin. Risk X: Avoid

Vonoprazan: CYP3A4 Inducers (Moderate) may decrease serum concentration of Vonoprazan. Risk X: Avoid

Vorapaxar: CYP3A4 Inducers (Moderate) may decrease serum concentration of Vorapaxar. Risk X: Avoid

Voriconazole: CYP3A4 Inducers (Moderate) may decrease serum concentration of Voriconazole. Risk C: Monitor

Vortioxetine: CYP3A4 Inducers (Moderate) may decrease serum concentration of Vortioxetine. Risk C: Monitor

Voxelotor: CYP3A4 Inducers (Moderate) may decrease serum concentration of Voxelotor. Management: Avoid concomitant use of voxelotor and moderate CYP3A4 inducers. If unavoidable, increase the voxelotor dose to 2,000 mg once daily. For children ages 4 to less than 12 years, weight-based dose adjustments are required. See full monograph for details. Risk D: Consider Therapy Modification

Voxilaprevir: CYP3A4 Inducers (Moderate) may decrease serum concentration of Voxilaprevir. Risk X: Avoid

Zaleplon: CYP3A4 Inducers (Moderate) may decrease serum concentration of Zaleplon. Risk C: Monitor

Zanubrutinib: CYP3A4 Inducers (Moderate) may decrease serum concentration of Zanubrutinib. Management: Avoid this combination if possible. If coadministration of zanubrutinib and a moderate CYP3A4 inducer is required, increase the zanubrutinib dose to 320 mg twice daily. Risk D: Consider Therapy Modification

Zolpidem: CYP3A4 Inducers (Moderate) may decrease serum concentration of Zolpidem. Risk C: Monitor

Zopiclone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Zopiclone. Risk C: Monitor

Zuranolone: CYP3A4 Inducers (Moderate) may decrease serum concentration of Zuranolone. Risk X: Avoid

Food Interactions

Bioavailability is increased when administered with a fat-containing meal. Management: Administer with food.

Reproductive Considerations

Issues related to females:

Evaluate pregnancy status prior to use in females of reproductive potential. Effective contraception should be used for 1 month prior to initiating treatment, during therapy, and for at least 1 month after the last bexarotene dose. Either abstinence or two forms of reliable contraception (one should be nonhormonal) are recommended.

A negative pregnancy test (sensitivity of at least 50 mIU/mL) within 1 week prior to beginning therapy, and monthly, thereafter, is required for females of reproductive potential. Treatment should begin on the second or third day of a normal menstrual period. A maximum 1-month supply is recommended so that pregnancy tests may be evaluated.

Females who desire conception following bexarotene therapy should have a minimum washout period of 1 month (Scarisbrick 2013).

Issues related to males: Male patients must use a condom during sexual intercourse with females who are pregnant, possibly pregnant, or who may become pregnant during therapy and for at least 1 month after the last bexarotene dose.

Pregnancy Considerations

Bexarotene use is contraindicated in pregnancy. [US Boxed Warning]: Bexarotene is a member of the retinoid class of drugs that is associated with birth defects in humans. Bexarotene also caused birth defects when administered orally to pregnant rats. Bexarotene must not be administered to a pregnant woman. If a woman becomes pregnant while taking the drug, bexarotene must be stopped immediately and appropriate counseling be given.

Breastfeeding Considerations

It is not known if bexarotene is present in breast milk.

Due to the potential for serious adverse reactions in a breastfeeding infant, breastfeeding is not recommended by the manufacturer.

Monitoring Parameters

If female, pregnancy test within 1 week before initiation then monthly while on bexarotene; fasting lipid panel (before initiation, then weekly until lipid response established [usually 2 to 4 weeks] and then at 8-week intervals thereafter); LFTs (baseline, then at 1, 2, and 4 weeks after initiation, then at 8-week intervals thereafter if stable); monitor thyroid function tests (including free T4) at baseline and weekly for the first 5 to 7 weeks, then every 1 to 2 months (Hamnvik 2011); CBC with differential (baseline and periodic); blood glucose (in diabetic patients). Evaluate pregnancy status prior to use in females of reproductive potential. Ophthalmic exam (if visual abnormalities occur). Monitor adherence.

The American Society of Clinical Oncology hepatitis B virus (HBV) screening and management provisional clinical opinion (ASCO [Hwang 2020]) recommends HBV screening with hepatitis B surface antigen, hepatitis B core antibody, total Ig or IgG, and antibody to hepatitis B surface antigen prior to beginning (or at the beginning of) systemic anticancer therapy; do not delay treatment for screening/results. Detection of chronic or past HBV infection requires a risk assessment to determine antiviral prophylaxis requirements, monitoring, and follow-up.

UK consensus monitoring recommendations: CBC with differential, urea, electrolytes, liver function tests, fasting lipid panel, free T4 and free T3 levels, blood glucose, and creatine kinase prior to treatment and every 1 to 2 weeks until stable for at least 1 month and for 2 consecutive tests, then every 2 weeks during dose escalations, then once a month after dose is optimized and blood work is stable for 2 consecutive tests. Thyroid-stimulating hormone at baseline (only). Refer to consensus recommendations for further details (Scarisbrick 2013).

Mechanism of Action

Bexarotene selectively binds to and activates retinoid X receptors (RXRs). Once activated, RXRs function as transcription factors to regulate the expression of genes which control cellular differentiation and proliferation. Bexarotene inhibits the growth in vitro of some tumor cell lines of hematopoietic and squamous cell origin and induces tumor regression in vivo in some animal models.

Pharmacokinetics (Adult Data Unless Noted)

Absorption: AUC increased 35% and Cmax increased 48% by a fat-containing meal.

Protein binding: >99% to plasma proteins.

Metabolism: Hepatic via CYP3A4 isoenzyme to four metabolites; further metabolized by glucuronidation.

Half-life elimination: ~7 hours.

Time to peak: ~2 hours.

Excretion: Feces (primarily); urine (minimal, <1%).

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

  • (AR) Argentina: Impilo | Targretin;
  • (AT) Austria: Targretin;
  • (BE) Belgium: Targretin;
  • (BG) Bulgaria: Targretin;
  • (CL) Chile: Targretin;
  • (DE) Germany: Bexaroten cipla | Targretin;
  • (ES) Spain: Bexaroteno cipla | Targretin;
  • (FI) Finland: Targretin;
  • (FR) France: Bexarotene cipla | Targretin;
  • (GB) United Kingdom: Targretin;
  • (GR) Greece: Targretin;
  • (HU) Hungary: Targretin;
  • (IE) Ireland: Targretin;
  • (IT) Italy: Targretin;
  • (JP) Japan: Targretin;
  • (NL) Netherlands: Targretin;
  • (NO) Norway: Targretin;
  • (PR) Puerto Rico: Targretin;
  • (SE) Sweden: Targretin;
  • (SI) Slovenia: Targretin;
  • (SK) Slovakia: Targretin;
  • (TR) Turkey: Bexgratin
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