Derived from ASAM’s definitive work, Principles of Addiction Medicine, 6th Edition , this companion resource is ideal for residents, fellows, and practitioners in psychiatry, as well as addiction medicine specialists and other healthcare workers who provide care to patients with substance use disorders. Streamlined and easy to use, the Essentials volume provides authoritative information on everything from the pharmacology of addiction through diagnosis, assessment, and early intervention—all in concise, easy-to-navigate format for ease of reference.