title: Butorphanol placed into schedule IV.
mesh_terms: D000701:Analgesics, Opioid; D000818:Animals; D000996:Antitussive Agents; D002077:Butorphanol; D004335:Drug and Narcotic Control / Q000331:legislation & jurisprudence*; D006801:Humans; D013287:Illicit Drugs / Q000331:legislation & jurisprudence*; D014481:United States; D019155:Veterinary Drugs
chemical_list: D000701:Analgesics, Opioid; D000996:Antitussive Agents; D013287:Illicit Drugs; D019155:Veterinary Drugs; D002077:Butorphanol