Narcotics.
D000701:Analgesics, Opioid; D000771:Anesthesia, Intravenous; D000777:Anesthetics; D003864:Depression, Chemical; D005283:Fentanyl; D006801:Humans; D007700:Kinetics; D009020:Morphine; D009292:Narcotic Antagonists; D012119:Respiration / Q000187:drug effects
D000701:Analgesics, Opioid; D000777:Anesthetics; D009292:Narcotic Antagonists; D009020:Morphine; D005283:Fentanyl