Diplopia is a symptom of phenytoin overdose. Which option lists a symptom of phenytoin overdose?

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Multiple Choice

Diplopia is a symptom of phenytoin overdose. Which option lists a symptom of phenytoin overdose?

Explanation:
Phenytoin overdose produces dose‑related CNS depression, especially affecting the cerebellum and ocular motor control. Diplopia happens because the extraocular muscles and their brainstem control are disturbed, so the eyes don’t align properly and you see double. This is a classic, discrete ocular symptom of overdose and directly reflects impaired ocular movement. Other valid overdose signs, like nystagmus and ataxia, are also common and reflect broader cerebellar/central involvement, while confusion can occur with more significant CNS depression. Thus, diplopia is a recognized symptom of phenytoin overdose, making it the best match for the question.

Phenytoin overdose produces dose‑related CNS depression, especially affecting the cerebellum and ocular motor control. Diplopia happens because the extraocular muscles and their brainstem control are disturbed, so the eyes don’t align properly and you see double. This is a classic, discrete ocular symptom of overdose and directly reflects impaired ocular movement. Other valid overdose signs, like nystagmus and ataxia, are also common and reflect broader cerebellar/central involvement, while confusion can occur with more significant CNS depression. Thus, diplopia is a recognized symptom of phenytoin overdose, making it the best match for the question.

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