Which pupil change is commonly associated with opioid use?

Which pupil change is commonly associated with opioid use?

• A. Constricted
• B. Dilated
• C. Equal and reactive
• D. No change

Answer: (A)

Opioids commonly cause pinpoint pupils (miosis) because they increase parasympathetic activity in the eyes via mu-receptor stimulation in the brainstem, leading to constriction of the pupil through the oculomotor nerve pathways. This pupil constriction is a classic sign of opioid intoxication or overdose and often appears with respiratory depression and sedation. Dilation would point away from opioid use, as it reflects sympathetic stimulation or anticholinergic effects, not the typical opioid effect. Pupils that are equal and reactive or no change lack the distinctive miosis associated with opioid use, so they’re not the characteristic finding you’d expect.

Opioids commonly cause pinpoint pupils (miosis) because they increase parasympathetic activity in the eyes via mu-receptor stimulation in the brainstem, leading to constriction of the pupil through the oculomotor nerve pathways. This pupil constriction is a classic sign of opioid intoxication or overdose and often appears with respiratory depression and sedation.

Dilation would point away from opioid use, as it reflects sympathetic stimulation or anticholinergic effects, not the typical opioid effect. Pupils that are equal and reactive or no change lack the distinctive miosis associated with opioid use, so they’re not the characteristic finding you’d expect.