WHEN A NURSING MOTHER NEEDS TO TAKE MEDICATIONS
There are times that a nursing mother needs to take medications. Many are safe to take during breastfeeding. If a new mother needs surgery, ask what drugs will be used for anesthesia. The anesthesiologist can answer questions about whether the medicines are safe for breasfeeding, and how long the medications can be present in breastmilk. This link
from the National Institute of Health will give information on specific drugs and their safety profiles.