Opioid Analgesics

An opioid can reduce pain while simultaneously weakening the brainstem drive to breathe. That pairing explains why opioid analgesics are high-alert medications: the same receptor activity that dampens nociceptive transmission can also reduce arousal, cough, and ventilatory response. The first bedside question after an opioid is not simply, “Did the pain score fall?” Ask whether the patient remains easy to rouse, is breathing effectively, and can protect the airway. A patient who reports less pain but is difficult to awaken with shallow respirations is deteriorating, not responding well. Risk rises after a new prescription, dose increase, route change, administration to an opioid-naive patient, or combination with alcohol, benzodiazepines, gabapentinoids, sleep medications, or other sedating drugs. Sleep-disordered breathing, advanced age, pulmonary disease, renal impairment, and hepatic impairment further reduce the margin of safety. Pain still deserves treatment. Respiratory compromise changes the priority.