Pharmacology · single question
A patient has gingival enlargement shown in a picture. Which medication MOST likely caused this?
Show answer and explanation
Correct answer: A. Phenytoin (Dilantin)
Drug-induced gingival enlargement (DIGO) is classically caused by: phenytoin (Dilantin) for seizures, cyclosporine (immunosuppressant), and calcium channel blockers (nifedipine, amlodipine). Phenytoin is the classic board answer. Lisinopril causes dry cough and angioedema, not gingival enlargement. Phenytoin = most classic DIGO medication.