Which antiseizure medication requires careful monitoring for skin rash, especially with valproate or during rapid titration?

• A. Levetiracetam
• B. Gabapentin
• C. Lamotrigine
• D. Carbamazepine

Answer: (C)

Lamotrigine has a well-known risk of causing skin rash that can progress to serious reactions like Stevens-Johnson syndrome. This risk is especially heightened when valproate is used, because valproate inhibits lamotrigine metabolism and raises its levels in the blood. Because of this, dosing must start very low and be increased slowly over several weeks to minimize the chance of a rash. Patients should be monitored closely for skin changes during the first weeks of therapy, and any sign of rash means the medication should be stopped promptly to prevent progression. While other antiseizure medications can cause rash, the combination with valproate and the necessity for gradual titration make lamotrigine the drug most associated with this monitoring requirement.