Althea Drug Interactions

cyproterone + ethinylestradiol




Full Prescribing Info
Drug Interactions
Taking contraceptive pills with drugs that induce hepatic microsomal enzymes (e.g., carbamazepine, griseofulvin, oxcarbazepine, phenytoin, phenobarbital, primidone, St. John's Wort, topiramate, and rifampicin) may reduce the contraceptive efficacy and/or increase breakthrough bleeding.
Taking contraceptive pills with anti-infective drugs (e.g., ampicillin, neomycin, nitrofurantoin, penicillin V, sulfonamides and tetracyclines) may result in decreased contraceptive efficacy.
Taking contraceptive pills with troleandomycin may increase the risk of cholestatic jaundice and should be used cautiously.
Taking contraceptive pills with Ethinylestradiol and drugs or food that inhibit cytochrome P-450 isoenzyme 3A4 (CYP3A4) such as clarithromycin, erythromycin, grapefruit juice, itraconazole, ketoconazole, ritonavir may result in increased plasma concentrations of Ethinylestradiol and an increase in the incidence of adverse effects.
Taking contraceptive pills with analgesics, isoniazid, antimigraine drugs and tranquilizers may decrease contraceptive efficacy.
Taking contraceptive pills with alcohol may reduce the effectiveness of Cyproterone acetate.
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