Postoperative pain.
D000700:Analgesics / Q000008:administration & dosage; D000767:Anesthesia, Epidural; D006801:Humans; D007275:Injections, Intravenous; D009892:Opium / Q000037:antagonists & inhibitors / Q000627:therapeutic use; D010149:Postoperative Pain / Q000188:drug therapy*
D000700:Analgesics; D009892:Opium