title: Tramadol becomes controlled substance.
mesh_terms: D000701:Analgesics, Opioid / Q000494:pharmacology*; D000818:Animals; D061891:Controlled Substances; D004335:Drug and Narcotic Control; D007880:Legislation, Drug; D010146:Pain / Q000188:drug therapy / Q000662:veterinary; D014147:Tramadol / Q000494:pharmacology*
chemical_list: D000701:Analgesics, Opioid; D061891:Controlled Substances; D014147:Tramadol