title: How well do we know the opioids for providing good analgesia?
authors.forename: John L
authors.initials: JL
authors.lastname: Straughan
mesh_terms: D000698:Analgesia / Q000379:methods* / Q000592:standards; D000701:Analgesics, Opioid / Q000592:standards / Q000627:therapeutic use*; D011431:Dextropropoxyphene; D006801:Humans; D008614:Meperidine; D009020:Morphine
chemical_list: D000701:Analgesics, Opioid; D009020:Morphine; D008614:Meperidine; D011431:Dextropropoxyphene