This new edition outlines the evidence-base for the use of medication during breastfeeding. It presents an expanded and updated guide to the most frequently prescribed drugs and their safety for breastfeeding mothers. Evaluating the evidence for interventions and using a simple format for quickly identifying medications which are safe or unsafe to use, it also highlights those drugs where there is inconclusive evidence. Additional contextual information - including material on the biology of the breast, chronic conditions, conditions related to lactation, and how to effectively support mothers - makes this the most complete text for practitioners who support and treat breastfeeding women.