Many antiepileptic drugs decrease the efficacy or oral contraceptives

February 1997

    Many physicians aren't aware that many antiepileptic drugs decrease the efficacy of oral contraceptives.

    Hormone levels are reduced by nearly HALF by carbamazepine...phenytoin...phenobarbital...primidone...and ethosuximide.

    Topamax can decrease estrogen levels about 20%.

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