These monographs, which take up about two-thirds of the book, list the different names of each drug and its classification, pharmacology, mechanisms of action, medical uses, common patterns of abuse, toxicity, effects in pregnancy and lactation, withdrawal syndromes, overdosage, and other important facts. The volume also contains an introduction to drugs and substances of abuse that describes a useful and practical framework for thinking about drug problems in the individual and society. Unfortunately, the authors never quite explain the difference between a "drug" and a "substance." They apply both terms to alcohol and seldom use the terms separately.