Raju, a 10 yr old boy is having difficulty in learning at school. He has sho lapses of awareness with eyelid fluttering that occur every 5-10 minutes. EEG studies reveal brief 3 Hz spike and wave discharges appearing synchronously in all the leads. Which of the following drugs would be effective but has the disadvantage that it causes sedation and tolerance?
Diazepam Ethosuximide Clonazepam Valproic acid