This book serves as a reader-friendly training and reference resource for medical professionals working with dual diagnosis (DD) patients. Written by experts in the field, the text covers the unique psychiatric and medical assessment topics as well as neurologic conditions, best interviewing techniques, medication guidelines, and other topics that may be challenging when working with a DD patient. Each chapter opens with case vignettes to easily demonstrate a particular scenario and is followed up with concise, practical information. All chapters include tables that summarize the clinical pearls as well as the DSM-5 and DM-ID-2 diagnostic criteria that is most vital to care. Guide to Intellectual Disabilities is an excellent resource for all clinicians who will work with DD patients, including those in child and adult psychiatry, pediatrics, family physicians, nurse practitioners, psychologists, and all others.