Miosis is commonly caused by which class of drugs?

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Study for the NBEO Part II TMOD Exam. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

Miosis is commonly caused by which class of drugs?

Explanation:
Miosis, or pupil constriction, happens when the parasympathetic system stimulates the iris sphincter muscle. Opiates cause this constriction by activating μ receptors in the brain, which increases parasympathetic outflow to the eye via the Edinger–Westphal nucleus, making the pupil small. This is a classic sign of opioid exposure or overdose (pinpoint pupils). In contrast, drugs with anticholinergic effects block the constriction pathway and widen the pupil (mydriasis), while drugs called mydriatics actively dilate the pupil. Beta blockers don’t reliably produce miosis as a primary effect. So the class most commonly linked to miosis is opiates.

Miosis, or pupil constriction, happens when the parasympathetic system stimulates the iris sphincter muscle. Opiates cause this constriction by activating μ receptors in the brain, which increases parasympathetic outflow to the eye via the Edinger–Westphal nucleus, making the pupil small. This is a classic sign of opioid exposure or overdose (pinpoint pupils). In contrast, drugs with anticholinergic effects block the constriction pathway and widen the pupil (mydriasis), while drugs called mydriatics actively dilate the pupil. Beta blockers don’t reliably produce miosis as a primary effect. So the class most commonly linked to miosis is opiates.

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