I'm looking for the best medicine to control night seizures for my 21 year old son. he is on 4000mg of keppra (levetiracetam) a day, but seems like not doing the job?

Needs something else: That dose of keppa is quite high. I assume that other medications have been tried. I assume that eeg monitoring has been done to catch one of the seizures on eeg. Excellent new medications are now available that can help. Or he may be a candidate for other modes of treatment including vns. He may benefit from use of valium agents at nighttime to protect him during sleep.

Anticonvulsants: There are many other antiseizure medications available that might be helpful to your son. You should contact the person prescribing his Keppra (levetiracetam) to discuss alternatives.