This fourth edition of what has become an indispensable pocket guide to general psychiatry and the subspecialties continues to provide portable reassurance to health professionals at all levels of experience when dealing with psychiatric issues. As well as a comprehensive overview of the common presentations in psychiatry, this handbook includes practical guidance on the principles of management for individual conditions. Subspecialties, including old age psychiatry, substance misuse, child and adolescent psychiatry, forensic psychiatry, intellectual disability, liaison psychiatry, and psychotherapy are covered in separate chapters, as are overarching considerations such as legal issues, cultural context, and therapeutics. As in previous editions, the handbook is indexed alphabetically, by ICD-10/DSM-5 codes, and by acute presentations for quick access to topics. The text is peppered with clinical observations, guidance, and commentary, reflecting the authors’ own experiences of working in psychiatry. This new edition has been thoroughly revised and updated to include the latest clinical guidelines, new licensed drug indications, changes to the legislature impacting on psychiatric practice across the United Kingdom and Ireland, the new DSM-5 classification system, and the anticipated ICD-11 changes to diagnostic coding.