"Recreational drugs" is a loose term that refers to legal and illegal drugs that are used without medical supervision. There are four categories of recreational drugs: analgesics, depressants, stimulants, and hallucinogens. Analgesics include narcotics like heroin, morphine, fentanyl, and codeine. Depressants include alcohol, barbiturates, tranquilizers, and nicotine. Stimulants include cocaine, methamphetamine, and ecstasy (MDMA). Hallucinogens include LSD (acid), peyote (mescaline), psilocybin (magic mushrooms), marijuana, ketamine, phencyclidine (PCP), and salvia divinorum (diviner's sage).