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Drug Interactions between boceprevir and esterified estrogens

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

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Interactions between your drugs

Moderate

esterified estrogens boceprevir

Applies to: esterified estrogens and boceprevir

Consumer information for this interaction is not currently available.

MONITOR: Coadministration with the hepatitis C virus (HCV) NS3/4A protease inhibitors, boceprevir and telaprevir, may decrease the plasma concentrations and efficacy of estrogens used for hormonal replacement therapy. The mechanism involves induction of CYP450 3A4, the isoenzyme primarily responsible for the metabolic clearance of sex hormones. When an oral contraceptive containing drospirenone-ethinyl estradiol (3 mg-0.02 mg daily for 14 days) was given in combination with boceprevir (800 mg three times daily for 7 days), ethinyl estradiol systemic exposure (AUC) decreased by approximately 25%, with no change in the peak plasma concentration (Cmax). In a study of 24 subjects who were administered an oral contraceptive containing ethinyl estradiol-norethindrone (0.035 mg-0.5 mg daily) concomitantly with telaprevir (750 mg every 8 hours) for 21 days, the Cmax and AUC of ethinyl estradiol decreased by 26% and 28%, respectively. In addition, there was a 33% reduction in the trough plasma concentration (Cmin) of ethinyl estradiol.

MANAGEMENT: Dosage adjustments as well as increased clinical and laboratory monitoring for estrogen deficiency should be considered whenever boceprevir or telaprevir is used concomitantly with estrogens used for hormonal replacement therapy.

Drug and food interactions

Moderate

boceprevir food

Applies to: boceprevir

Food significantly increases the absorption of boceprevir. You should take each dose of boceprevir with a meal or light snack. Taking it on an empty stomach may lead to inadequate blood levels and reduced effectiveness of the medication.

Minor

esterified estrogens food

Applies to: esterified estrogens

Information for this minor interaction is available on the professional version.

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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