Over the last decade many hundreds of new psychoactive drugs have emerged onto illicit markets. This flood of new drugs has led to clinicians being unsure of the rapidly emerging changing evidence base and uncertain of the best approaches to assessment and clinical management. This book provides a concise, accessible summary of these emerging drugs. By categorizing the hundreds of new drugs by their predominant psychoactive effect - sedative, stimulant and hallucinogenic - the book helps clinicians to manage a drug they are unfamiliar with by using their experience of other drugs with similar psychoactive properties. Written for clinicians from across the frontline, from A&E staff to drug treatment professionals, the authors draw on numerous clinical examples from their own clinical experiences to illustrate aspects of assessment and management. Club drugs and novel psychoactive substances will continue to challenge clinicians and this handbook provides readers with an invaluable introduction to this complex area.