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Drug Interactions between bexarotene and ramelteon

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

bexarotene ramelteon

Applies to: bexarotene and ramelteon

MONITOR: Coadministration with inducers of CYP450 isoenzymes may decrease the plasma concentrations and pharmacologic effects of ramelteon, which is metabolized by CYP450 1A2 and, to a lesser extent, by CYP450 3A4 and the 2C subfamily of isoenzymes. When a single 32 mg oral dose of ramelteon was administered to healthy volunteers following pretreatment with the potent CYP450 inducer rifampin (600 mg orally once daily for 11 days), total systemic exposure (AUC) to ramelteon and its pharmacologically active metabolite was decreased by an average of approximately 80% (range 40% to 90%). Use with other inducers has not been adequately studied.

MANAGEMENT: The efficacy of ramelteon may be reduced when prescribed with potent inducers of CYP450 isoenzymes such as carbamazepine, enzalutamide, phenobarbital, phenytoin, rifampin, and St. John's wort. Other known inducers include aminoglutethimide, bexarotene, bosentan, dabrafenib, dexamethasone, efavirenz, etravirine, mitotane, modafinil, nafcillin, nevirapine, rifabutin, rifapentine, barbiturates and various other anticonvulsants, although the extent to which they interact with ramelteon is unknown.

References (1)
  1. (2005) "Product Information. Rozerem (ramelteon)." Takeda Pharmaceuticals America

Drug and food interactions

Moderate

bexarotene food

Applies to: bexarotene

ADJUST DOSING INTERVAL: Food may enhance the oral bioavailability of bexarotene. In one clinical study, bexarotene peak plasma concentration (Cmax) and systemic exposure (AUC) resulting from a 75 to 300 mg dose were 35% and 48% higher, respectively, when administered after a fat-containing meal relative to a glucose solution. In all clinical trials, patients were instructed to take bexarotene with or immediately following a meal.

Coadministration with inhibitors of CYP450 3A4 such as grapefruit juice may theoretically increase the plasma concentrations of bexarotene. In vitro studies suggest that bexarotene is metabolized by CYP450 3A4. However, concomitant administration with multiple doses of ketoconazole, a potent CYP450 3A4 inhibitor, did not alter bexarotene plasma concentrations, which would imply that bexarotene elimination is not substantially dependent on CYP450 3A4 metabolism in vivo.

MANAGEMENT: Because safety and efficacy data are based upon administration with food, bexarotene should be administered once daily with a meal. Patients may want to avoid consuming large amounts of grapefruit or grapefruit juice.

References (2)
  1. (2001) "Product Information. Targretin (bexarotene)." Ligand Pharmaceuticals
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics."
Moderate

ramelteon food

Applies to: ramelteon

GENERALLY AVOID: Alcohol may potentiate some of the pharmacologic effects of ramelteon. Use in combination may result in additive central nervous system depression and/or impairment of judgment, thinking, and psychomotor skills.

ADJUST DOSING INTERVAL: Administration of ramelteon with or immediately after a high-fat/heavy meal may delay the onset of hypnotic effects. In study subjects, administration of a 16 mg dose of ramelteon with a high-fat meal decreased the peak plasma drug concentration (Cmax) by 22% and delayed the median time to reach peak plasma drug concentration (Tmax) by approximately 45 minutes compared to administration in a fasted state.

MANAGEMENT: Patients receiving ramelteon should be advised to avoid the consumption of alcohol. For faster sleep onset, ramelteon should not be administered with or immediately after a high-fat/heavy meal.

References (1)
  1. (2005) "Product Information. Rozerem (ramelteon)." Takeda Pharmaceuticals America

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

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