Adverse reactions to medicines continue to be a burden on health care, causing considerable morbidity and mortality. In addition to knowing about the benefits of medicines, health care professionals need to understand the problem of adverse drug reactions and be aware of how they can be prevented and managed. This essential, practical guide has been extensively revised and updated to include three new chapters on side effects and patients, pharmacogenetics and adverse reactions, and adverse reactions in pregnancy. Case studies are provided with each chapter.