The depression of respiration by the opiates and its antagonism by nalorphine.
D000701:Analgesics, Opioid; D003863:Depression; D003866:Depressive Disorder; D006801:Humans; D008614:Meperidine / Q000494:pharmacology*; D008691:Methadone / Q000494:pharmacology*; D009020:Morphine / Q000009:adverse effects*; D009269:Nalorphine / Q000494:pharmacology*; D012119:Respiration
D000701:Analgesics, Opioid; D009020:Morphine; D008614:Meperidine; D009269:Nalorphine; D008691:Methadone
MEPERIDINE/effects; METHADON/effects; MORPHINE/injurious effects; NALORPHINE/effects