Which antiseizure medications are commonly used for post-TBI seizure prophylaxis?

• A. Levetiracetam
• B. Phenytoin
• C. Valproate
• D. Levetiracetam or phenytoin; sometimes valproate; choices depend on side-effect profiles.

Answer: (D)

In preventing seizures after traumatic brain injury, the goal is to cover the period when the brain is most vulnerable to early seizures, typically in the first week after injury. The two most commonly used options are levetiracetam and phenytoin. Phenytoin has long-standing evidence showing it can reduce early post-TBI seizures, but it comes with potential drug interactions and a range of side effects that require monitoring. Levetiracetam offers similar protective benefit but tends to be better tolerated, with fewer interactions and more predictable dosing, making it a popular alternative, especially in patients with complex medication regimens or liver concerns.

Valproate is less commonly used for this purpose in the acute TBI setting because of safety concerns, including potential hepatotoxicity and effects on blood clotting, which can be risky in brain injury patients. Nevertheless, in some situations it may be considered if other options are unsuitable or if there is prior tolerance, so selections can depend on individual side-effect profiles and clinical context.