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Drug Interactions between daclatasvir and fosamprenavir

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

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Interactions between your drugs

Moderate

fosamprenavir daclatasvir

Applies to: fosamprenavir and daclatasvir

MONITOR: Coadministration with moderate inhibitors of CYP450 3A4 may increase the plasma concentrations of daclatasvir, which is primarily metabolized by the isoenzyme. When a single 10 mg dose of daclatasvir was administered following pretreatment with the potent CYP450 3A4 inhibitor ketoconazole (400 mg once daily), daclatasvir peak plasma concentration (Cmax) and systemic exposure (AUC) increased by 1.6- and 3-fold, respectively. No data are available for other, less potent CYP450 3A4 inhibitors.

MANAGEMENT: Caution is advised when daclatasvir is used with moderate CYP450 3A4 inhibitors; however, according to the manufacturer, dose adjustments are not required. Patients should be monitored for adverse effects such as headache, fatigue, nausea, diarrhea, and serum lipase elevations.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  2. Cerner Multum, Inc. "Australian Product Information." O 0
  3. "Product Information. Daklinza (daclatasvir)." Bristol-Myers Squibb (2015):

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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. "Product Information. Lexiva (fosamprenavir)." GlaxoSmithKline (2003):

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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

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

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