NLM Toxicology and Environmental Health Info
Exclusive breastfeeding for six months is optimal for child health according to the American Academy of Pediatrics (http://pediatrics.aappublications.org/content/129/3/e827.full), the American Academy of Family Physicians (http://www.aafp.org/about/policies/all/breastfeeding.html), and the World Health Organization (http://www.who.int/nutrition/topics/exclusive_breastfeeding/en/).
Women who breastfeed often stop taking their medications. The National Library of Medicine (NLM) Drugs and Lactation Database (LactMed) provides information on drugs, herbals, nutraceuticals and diagnostic agents to which lactating mothers may be exposed and the possible adverse effects these may cause in the nursing infant.
Suggested therapeutic alternatives to those drugs are provided. All data are derived from the scientific literature and are fully referenced. Data are organized into substance-specific records, which provide a summary of the pertinent reported information and include links to other NLM databases. Supplemental links to breastfeeding resources from credible organizations are also provided.
http://toxnet.nlm.nih.gov/newtoxnet/lactmed.htm