The practice of drug emergencies reveals the dark sides of unreflective consumption of both legal and illegal substances - in psychological as well as pharmacological terms. This handbook finally presents a professionally grounded work that objectively describes the most common psychoactive drugs, their potential dangers, and the key measures for drug emergencies. Divided by specific effects or chemical relationships, over 40 substances, ranging from alcohol and antidepressants to ephedrine and heroin, as well as psilocybin and yohimbine, are presented in monographic form. The monographs include: chemical names and descriptions of the substances, symptoms and diagnostics, dosage and overdose, effects and side effects, dangers and interactions, as well as measures for emergency physicians, rescue services, and other first aid interventions.