The **Fifth Edition of Dr. Stahl's Essential Psychopharmacology** is a definitive guide for students and mental health professionals, providing clear, concise information on the mechanisms of disease and drug action. Renowned for its unique visual approach, the book incorporates over 500 new or updated figures, a color-coded system, and detailed explanations. The new edition covers 14 new indications for older medications, introduces 18 new drugs, and includes expanded sections on Parkinson's Disease Psychosis, dementia-related behaviors, and hallucinogen-assisted psychotherapy. This updated version also highlights the medical uses of cannabis and the latest findings on mixed features in major depressive episodes.