You can take certain medicines while breastfeeding, but not all. Almost all medicines pass into your milk in small amounts. Some have no effect on the baby and can be used while breastfeeding. Always talk to your doctor or pharmacist about medicines you are using and ask before you start using new medicines. This includes prescription and over-the-counter drugs, vitamins, and dietary or herbal supplements. For some women with chronic health problems, stopping a medicine can be more dangerous than the effects it will have on the breastfed baby.