Opioid analgesics.
D000701:Analgesics, Opioid / Q000494:pharmacology*; D001665:Binding Sites; D003061:Codeine / Q000494:pharmacology; D003729:Dental Care; D006801:Humans; D009020:Morphine / Q000494:pharmacology; D011957:Receptors, Opioid / Q000187:drug effects; D014076:Tooth Diseases / Q000188:drug therapy
D000701:Analgesics, Opioid; D011957:Receptors, Opioid; D009020:Morphine; D003061:Codeine