A 19-year-old patient who is beginning drug therapy with phenytoin (Dilantin) is taught to visit the dentist regularly. Which of the following adverse effects associated with phenytoin use ex-plains the health care provider's recommendation?
a. Increased risk of dental caries
b. Destruction of nerve roots of teeth
c. Gingival hyperplasia
d. Discoloration of tooth enamel
ANS: C
Patients are at increased risk for gingival hyperplasia when taking phenytoin if they are under the age of 23 or are taking more than 500 mg per day of this drug.
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