A 6 year old child, weighing 20 kg who is a known case of seizure disorder, already on Valproate 200 mg twice daily, presents with breakthrough seizures to the pediatric casualty. The seizures were aboed with Inj Lorazepam. What should be the next medication administered to this child?
Phenobarbitone Phenytoin Sodium Valproate Levetiracetam