Phenoba Phenobarbitone Cyproterone Acetate + Ethinyl Estradiol
ModerateTaking Cyproterone Acetate + Ethinyl Estradiol together with certain other medicines may make this tablet work less well. These medicines are Carbamazepine, Phenobarbital, Phenytoin, Pyrimidine and Rifampicin. They switch on the liver's enzymes, and the liver then breaks down the estrogen in the tablet faster than it should. Less estrogen stays in the body, so the tablet's effect can fall.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.