A client is taking the prescribed dose of phenytoin (Dilantin) to control seizures. Results of a phenytoin blood level study reveal a level of 35 mcg/mL. Which finding would be expected as a result of this laboratory result?

1. Hypotension

2. Tachycardia

3. Slurred speech

4. No abnormal finding

3. Slurred speech

Explanation:

Phenytoin is an anticonvulsant, anti-arrhythmic and muscle relaxant that affects ion channels. Its use is limited due to its many adverse effects, it can cause signs and symptoms depending on its doses, for the example given, a level between 30-40 mcg/mL can cause ataxia (lack of muscle control), slurred speech, nausea, and vomiting.

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