Which antiepileptic drug is most commonly associated with gingival hyperplasia as a side effect?

• A. Carbamazepine
• B. Phenytoin
• C. Lamotrigine
• D. Valproic acid

Answer: (B)

Phenytoin is the antiepileptic drug most commonly associated with gingival hyperplasia as a side effect due to its specific pharmacological action and interaction with oral tissues. This drug, known for its efficacy in controlling various types of seizures, can lead to the overgrowth of gum tissue as a result of its mechanism of action involving the modulation of sodium channels in neuronal tissues.

Gingival hyperplasia occurs because phenytoin affects fibroblast function, leading to increased collagen production and subsequent overgrowth of the gingival tissue. This side effect is particularly notable among patients who have been on long-term phenytoin therapy, and it emphasizes the need for regular dental check-ups and good oral hygiene to mitigate the risk of gum disease related to this medication.

In contrast, while the other medications listed—carbamazepine, lamotrigine, and valproic acid—have their own side effects, they do not have a significant association with gingival hyperplasia as phenytoin does. Understanding this unique side effect of phenytoin can help healthcare professionals better counsel patients about the potential risks involved with its use in epilepsy management.