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Drug Interactions between atazanavir and ethinyl estradiol

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

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Interactions between your drugs

Moderate

ethinyl estradiol atazanavir

Applies to: ethinyl estradiol and atazanavir

Ask your doctor before using ethinyl estradiol together with atazanavir. Atazanavir may affect the safety and decrease the birth control effectiveness of ethinyl estradiol. Women who use birth control pills or birth control patches should choose a different kind of contraception during atazanavir therapy. Using ethinyl estradiol together with atazanavir can also increase the blood levels or add to the side effects of ethinyl estradiol. This can cause sudden headache, confusion, pain behind the eyes, problems with vision, speech, or balance, nausea, and stomach pain. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Drug and food interactions

Moderate

atazanavir food

Applies to: atazanavir

Food can enhance the levels of atazanavir in your body. To ensure maximal oral absorption, atazanavir should be administered with or immediately after a meal. This will make it easier for your body to absorb the medication.

Moderate

ethinyl estradiol food

Applies to: ethinyl estradiol

Consumer information for this interaction is not currently available.

MONITOR: Coadministration of ethinyl estradiol may increase the plasma concentrations of drugs that are primarily metabolized by CYP450 1A2. In a study of 30 healthy volunteers administered the CYP450 1A2 substrate tizanidine, the systemic exposure (AUC) of tizanidine was 3.9 times greater in women using an oral contraceptive containing ethinyl estradiol.

MANAGEMENT: Patients should be monitored for increased adverse effects of the CYP450 1A2 substrate during concomitant use with ethinyl estradiol. Product labeling for the specific CYP450 1A2 substrate should be consulted for additional recommendations.

Minor

ethinyl estradiol food

Applies to: ethinyl estradiol

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

Minor

ethinyl estradiol food

Applies to: ethinyl estradiol

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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