title: Anticipatory analgesia for pain following hemorrhoidectomy.
mesh_terms: D001003:Anal Canal; D000700:Analgesics / Q000627:therapeutic use*; D006484:Hemorrhoids / Q000601:surgery*; D006801:Humans; D010149:Postoperative Pain / Q000188:drug therapy*; D012007:Rectum
chemical_list: D000700:Analgesics