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“Phenobarbital (phenobarbitone), phenytoin, carbamazepine, oxcarbazepine, felbamate and topiramate have been shown to increase the metabolism of ethinylestradiol and progestogens.”
“Although not yet examined in vitro, felbamate appears to induce the activity of CYP3A4, which would account for it reducing plasma concentrations of carbamazepine or the progestin gestodene.”