title: A double-blind comparison of oral butorphanol and codeine.
mesh_terms: D000328:Adult; D000368:Aged; D002077:Butorphanol / Q000009:adverse effects / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D003061:Codeine / Q000009:adverse effects / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009019:Morphinans / Q000627:therapeutic use*; D010149:Postoperative Pain / Q000188:drug therapy*; D013997:Time Factors
chemical_list: D009019:Morphinans; D002077:Butorphanol; D003061:Codeine