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After brain surgery
for Head injury
due to sub dural hematoma
, eptoin or any anti epileptic drug is given to patient for prophylaxis of any seizure
episode that may occur following surgery. It is a routine practice. So even if there is no history of seizure or epilepsy
, anti epileptic drugs are given. Regarding headache, although with phenatoin headache may occur as side effect but it non significant, if your father is experiencing headache it may be due to Trauma itself, or there may be raised intracranial pressure which may cause headache. Eptoin has nothing to do with headache, and yes he has to take this medicine for at least some months, and there is no harm.