Subarachnoid administration of butorphanol for the relief of postoperative pain.
D000368:Aged; D002077:Butorphanol / Q000008:administration & dosage*; D006801:Humans; D007278:Injections, Spinal; D008297:Male; D008875:Middle Aged; D009019:Morphinans / Q000008:administration & dosage*; D010149:Postoperative Pain / Q000517:prevention & control*; D011468:Prostatectomy
D009019:Morphinans; D002077:Butorphanol