The opiates: two centuries of scientific study.
D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009020:Morphine / Q000008:administration & dosage / Q000266:history*; D009892:Opium / Q000008:administration & dosage / Q000266:history* / Q000494:pharmacology; D019966:Substance-Related Disorders / Q000266:history* / Q000628:therapy
D009020:Morphine; D009892:Opium