Trusted intelligence operating system built on the most comprehensive biomedical knowledge base. Access data on drugs, targets, diseases, trials, and more, powering drug discovery and clinical decision-making. Recreational drug use is the use of a drug (legal, controlled, or illegal) with the primary intention of altering the state of consciousness through alteration of the central nervous system in order to create positive emotions and feelings. Unveil the world of drugs: from depressants to opioids, explore the types, effects, and risks. Dive into the realm of substances. Learn how to properly get rid of unused or expired medication. Drug and health information, from pharmacists you can trust. Browse A-Z: drugs, treatments, conditions, drug classes or symptoms. Drugs.com is the most popular, comprehensive and up-to-date source of drug information online. Drugs A to Z gives basic information on drugs with addictive potential, including how they are used, how they make people feel, and their health effects, including risk for substance use disorder. Treatment options for substance use disorders related to these drugs are also included. A drug is any chemical substance that affects the functioning of living things and the organisms (such as bacteria, fungi, and viruses) that infect them.