The new edition begins by clearly explaining the basic principles governing the authors’ practice of psychopharmacotherapy (e.g., "an empirically based foundation, derived from scientific investigation, is used to guide treatment decisions"). The next two chapters present the scientific approach to drug design and pharmacokinetics basic to understanding the discussions in the following chapters on specific categories of drugs. These subsequent chapters have similar formats, first discussing the indications for and then treatment with antipsychotics, antidepressants, mood stabilizers, antianxiety agents, sedative-hypnotics, ECT, and other somatic therapies. Two final chapters are reserved for the assessment and therapy of disorders that cross drug category boundaries, such as obsessive-compulsive and posttraumatic stress disorders, and for assessment and treatment of special populations, such as children, the elderly, alcoholics, and pregnant women.