Butorphanol versus morphine: equally ineffective when given incorrectly.
D000698:Analgesia; D002077:Butorphanol / Q000008:administration & dosage* / Q000627:therapeutic use; D006801:Humans; D007262:Infusions, Intravenous; D007273:Injections, Intramuscular; D009019:Morphinans / Q000008:administration & dosage*; D009020:Morphine / Q000008:administration & dosage* / Q000627:therapeutic use
D009019:Morphinans; D009020:Morphine; D002077:Butorphanol