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Drug Interactions between eletriptan and fosamprenavir

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

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Interactions between your drugs

Major

eletriptan fosamprenavir

Applies to: eletriptan and fosamprenavir

GENERALLY AVOID: Coadministration with potent inhibitors of CYP450 3A4 may significantly increase the plasma concentrations of eletriptan, which is primarily metabolized by the isoenzyme. According to the product labeling, eletriptan peak plasma concentration (Cmax) and systemic exposure (AUC) increased by nearly 3-fold and 6-fold, respectively, during coadministration with ketoconazole (400 mg). The half-life increased from 5 hours to 8 hours. Likewise, erythromycin (1000 mg) increased eletriptan Cmax by 2-fold and AUC by nearly 4-fold, while half-life increased from about 5 hours to 7 hours. Clinically, this interaction may result in increased risk of vasospastic reactions associated with the use of 5-HT1 receptor agonists, such as coronary artery vasospasm, peripheral vascular ischemia, and colonic ischemia.

MANAGEMENT: Eletriptan should not be used within at least 72 hours of treatment with potent CYP450 3A4 inhibitors. Alternatively, other 5-HT1 receptor agonists that are not metabolized by CYP450 3A4 may be considered, such as frovatriptan, naratriptan, rizatriptan, sumatriptan, and zolmitriptan.

References (1)
  1. (2003) "Product Information. Relpax (eletriptan)." Pfizer U.S. Pharmaceuticals

Drug and food interactions

Moderate

fosamprenavir food

Applies to: fosamprenavir

ADJUST DOSING INTERVAL: Food may reduce the systemic bioavailability of amprenavir from fosamprenavir oral suspension. The mechanism of interaction has not been described. According to the product labeling, administration of fosamprenavir oral suspension (1400 mg single dose) with a high-fat meal (967 kcal, 67 g fat, 33 g protein, 58 g carbohydrate) reduced amprenavir peak plasma concentration (Cmax) by 46% and systemic exposure (AUC) by 28% compared to administration in a fasted state. The time to reach peak plasma level (Tmax) was delayed by 0.72 hours. In contrast, the same high-fat meal did not affect the pharmacokinetics of amprenavir from fosamprenavir tablets.

MANAGEMENT: Fosamprenavir suspension should be administered on an empty stomach in adults, but with food in pediatric patients to aid palatability and compliance. If emesis occurs within 30 minutes after dosing the suspension, the dose should be repeated. Fosamprenavir tablets may be taken with or without food.

References (1)
  1. (2003) "Product Information. Lexiva (fosamprenavir)." GlaxoSmithKline

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.

See also

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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

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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