Which anticonvulsants are commonly used for early post-traumatic seizures, and for how long is prophylaxis typically continued?

• A. Levetiracetam or phenytoin; prophylaxis typically continued for about 7 days (some protocols up to 7 days, longer if seizures).
• B. Valproate for 2 weeks.
• C. Carbamazepine for 1 month.
• D. Lamotrigine for 3 days.

Answer: (A)

Preventing seizures in the immediate aftermath of brain injury focuses on short-term prophylaxis during the high-risk early period. The drugs commonly chosen are levetiracetam or phenytoin because both effectively reduce the chance of early post-traumatic seizures and have manageable safety profiles. Levetiracetam is often favored today due to fewer drug interactions and simpler dosing, while phenytoin has a long track record but carries more potential side effects and interactions.

The usual plan is to continue prophylaxis for about seven days after the injury, covering the window when the brain is most susceptible to seizures. If seizures occur or if there are specific high-risk features, clinicians may extend therapy beyond that initial week. Other anticonvulsants listed in the choices are not routinely used for this short-term prophylaxis in the early period due to less evidence for benefit in this context or because their side effect profiles and monitoring requirements are less suitable for acute post-injury use.