A health care provider is performing an initial assessment on a patient receiving phenytoin (Di-lantin). Which of the following adverse effects may occur with use of this medication?
a. Drowsiness, confusion, and aphasia
b. Nystagmus, ataxia, and gingival hyperplasia
c. Dry mouth, blurred vision, and urinary retention
d. Lightheadedness, dizziness, and nausea
ANS: B
The most common adverse effects of phenytoin include nystagmus, ataxia, diplopia, gingival hy-perplasia, nausea, hypotension, hypertrichosis, and skin rashes. Life-threatening adverse effects include aplastic anemia, agranulocytosis, and Stevens-Johnson syndrome.
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