Why Might Pupils Be Small?


Quick Answer

Pupils may become small due to different causes, such as drug abuse, side effects of some medications and underlying medical issues, according to WebMD. Constricted or pinpoint pupils can be a symptom of taking or abusing opiates like morphine or heroin. Pupils become constricted because these opioid drugs stimulate a portion of the autonomic nervous system, states the EMT Spot.

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Full Answer

Medical conditions such as a brainstem stroke, iritis and Horner's syndrome can present the symptom of constricted pupils, according to Right Diagnosis. Horner's syndrome is a condition in which the parasympathetic nervous system is damaged, leading to a constricted pupil on the affected side of the face.

Pilocarpine, dihydrocodeine and pethidine are some prescribed medication that can cause the side effect of small pupils. Pilocarpine is a medication used in the treatment of dry mouth, while dihydrocodeine and pethidine are drugs that are prescribed for pain.

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