Aug. 18, 2007 -- The FDA today warned breastfeeding mothers who take codeine for after-birth pain to carefully watch their babies for signs of life. Drugs Usually Safe in Typical Doses While Breastfeeding. Name of Drug. Acetaminophen (Tylenol) Used for pain relief: Acyclovir and valacyclovir (Zovirax, Valtrex) Advice for mothers using Acetaminophen while breastfeeding. Includes possible effects on breastfed infants and lactation. All about Acetaminophen and pregnancy/breastfeeding. Is it safe to use while pregnant and/or breastfeeding? safe medications while breastfeeding. When determining what medications are safe to use while breastfeeding, we look at two factors. One, will the medication have an. Breast-feeding and medications — Understand which medications are safe to take while breast-feeding. The following are a few commonly used drugs considered safe during breastfeeding: Acetaminophen (Tylenol, Tempra), alcohol (in reasonable amounts), aspirin (in usual. College of Pharmacy 1295 N. Martin PO Box 210202 Tucson, AZ 85721 Phone: 520-626-1427 College of Pharmacy - Phoenix.