The opioid side effect miosis results in which finding?

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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

The opioid side effect miosis results in which finding?

Explanation:
Opioids produce miosis by activating mu receptors in the brain that increase parasympathetic outflow to the eye. This causes the iris sphincter muscle to contract, yielding very small pupils—pinpoint pupils. This pinpoint constriction is a hallmark sign of opioid effect or overdose. Dilation would come from sympathetic stimulation or anticholinergic effects, not opioids, and while blurred vision or redness can occur with other conditions, they do not define opioid miosis.

Opioids produce miosis by activating mu receptors in the brain that increase parasympathetic outflow to the eye. This causes the iris sphincter muscle to contract, yielding very small pupils—pinpoint pupils. This pinpoint constriction is a hallmark sign of opioid effect or overdose. Dilation would come from sympathetic stimulation or anticholinergic effects, not opioids, and while blurred vision or redness can occur with other conditions, they do not define opioid miosis.

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