Derived from ASAM\u2019s 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.  Presents the collective wisdom of hundreds of esteemed authorities on the art and science of addiction medicine, including the physical, emotional, and mental health effects of substance misuse.Features key points, review questions, and suggested readings that help maximize understanding and retention of essential concepts.