Anticonvulsants (carbamazepine, felbamate, phenobarbital, phenytoin, topiramate): Increase the metabolism of ethinyl estradiol and/or some progestins, leading to possible decrease in contraceptive effectiveness.
<Anticonvulsants, mechanism, ethinyl estradiol>, <Anticonvulsants, mechanism, progestins>, <carbamazepine, mechanism, ethinyl estradiol>, <carbamazepine, mechanism, progestins>, <felbamate, mechanism, ethinyl estradiol>, <felbamate, mechanism, progestins>, <phenobarbital, mechanism, ethinyl estradiol>, <phenobarbital, mechanism, progestins>, <phenytoin, mechanism, ethinyl estradiol>, <phenytoin, mechanism, progestins>, <topiramate, mechanism, ethinyl estradiol>, <topiramate, mechanism, progestins>