What is the most appropriate treatment for trigeminal neuralgia?

• A. Gabapentin
• B. Amitriptyline
• C. Phenytoin
• D. Carbamazepine

Answer: (D)

Trigeminal neuralgia is best treated first with carbamazepine because it directly dampens the abnormal nerve firing in the trigeminal pathway that causes the sudden, shock-like facial pains. Mechanistically, carbamazepine blocks voltage-gated sodium channels, stabilizing hyperexcitable neurons and reducing the rapid discharge that produces paroxysmal attacks. This action translates into fewer and less intense pain episodes, and there is extensive clinical experience and guideline support for its use as the initial therapy.

Starting with a low dose and gradually increasing allows the dose to be tailored to pain control while monitoring for side effects. Common issues to watch for include dizziness or drowsiness, and more serious concerns like hyponatremia, bone marrow suppression, liver enzyme changes, and potential severe skin reactions in rare cases. Carbamazepine also interacts with many other drugs due to enzyme induction, so dosing and monitoring are important.

If carbamazepine cannot be used, alternatives exist, but they are generally less effective as first-line therapy for classic trigeminal neuralgia.