Rifampicin can make the Norgestrel + Ethinyl Estradiol + Ferrous Fumarate pill work less well. It speeds up how quickly your body clears the hormones, norgestrel and ethinyl estradiol, from your blood. Less of them stays in your body, so the pill may not protect you from pregnancy as reliably as it should. If you need to take rifampicin, talk to your doctor or pharmacist first about an extra or different method of contraception.
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.