Taking carbamazepine together with cyproterone acetate and ethinyl estradiol tablets can make the tablets work less well. Carbamazepine speeds up how quickly the liver breaks down estrogen, so less of the estrogen stays in your body to do its job.
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.