Developed by world leaders in lactational pharmacology, this essential reference contains the most current, complete, and evidence-based information available on the transmission of maternal drugs into human milk. It thoroughly addresses one of the most commonly asked questions by breastfeeding mothers—which drugs are safe, and which are hazardous for the infant? The new twentieth edition adds 72 new drugs, updates 356 medications with new data, and adds new information to 927 drugs. The resource relies upon the most current evidence-based studies to evaluate the relative risk of commonly used drugs including Dr. Hale's highly renowned Lactation Risk Categories (LRC). Considered indispensable by hundreds of clinicians worldwide, the book lists safe alternatives for drugs one is currently taking or might need to take in the future. For ease of access to information, it includes key points and savvy tips in information boxes, common abbreviations, illustrative diagrams, concise information on evaluating the infant, and more. New to the 2023 Edition: Key Features: