The opiates and their derivatives.
D003061:Codeine / Q000506:poisoning; D004305:Dose-Response Relationship, Drug; D004361:Drug Tolerance; D006213:Hallucinogens; D006801:Humans; D008691:Methadone / Q000506:poisoning; D009021:Morphine Dependence; D009294:Narcotics / Q000494:pharmacology; D009892:Opium / Q000494:pharmacology / Q000506:poisoning; D011605:Psychoses, Substance-Induced / Q000209:etiology; D019966:Substance-Related Disorders
D006213:Hallucinogens; D009294:Narcotics; D009892:Opium; D008691:Methadone; D003061:Codeine