The updated and revised Second Edition of this thorough reference explains in simple terms how drugs act and interact in the treatment of disease. Focusing on the mechanisms of drug action, the book details specific drugs by pharmacologic class for all body systems. Drugs for pain, psychiatric disorders, infection, fluid and electrolyte imbalance, and cancer are included. Potentially harmful drug and drug-herb interactions are also covered extensively. Written in the award-winning Incredibly Easy! style, the book features abundant illustrations, eye-catching icons, quick quizzes, memory joggers, and spirited cartoons that make learning fun. New to this edition: updated coverage of existing drugs and detailed coverage of new drugs; an expanded section on pain medications; a quick-reference chart of medications for skin disorders; and vaccines, toxoids, and other agents of both active and passive immunity