Which of the following is NOT a depressant effect of opioids on the body?

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Study for the Pain, Opioids, and Neuropsychiatric Pharmacology Test. Explore with flashcards and multiple choice questions; each query comes with hints and explanations. Prepare to excel in your exam!

Multiple Choice

Which of the following is NOT a depressant effect of opioids on the body?

Explanation:
Opioids produce several CNS and bodily depressant effects: they reduce pain (analgesia), slow brain activity leading to sedation, and depress respiratory drive by acting on brainstem centers. These are all signs of central nervous system and respiratory depression from opioid use. Pupil constriction, or miosis, is a different type of effect—an autonomic, parasympathetic change caused by mu receptor activation in oculomotor pathways that tightens the iris. It does not reflect a decrease in CNS activity or respiration. So, while analgesia, decreased respiration, and sedation are depressant effects, pupil constriction is not.

Opioids produce several CNS and bodily depressant effects: they reduce pain (analgesia), slow brain activity leading to sedation, and depress respiratory drive by acting on brainstem centers. These are all signs of central nervous system and respiratory depression from opioid use. Pupil constriction, or miosis, is a different type of effect—an autonomic, parasympathetic change caused by mu receptor activation in oculomotor pathways that tightens the iris. It does not reflect a decrease in CNS activity or respiration. So, while analgesia, decreased respiration, and sedation are depressant effects, pupil constriction is not.

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