Since I am not sure what the branded names are
for these in India, here are the generic names
for the most common anti-epileptics
for seizures of the gelastic type: carbamazepine, clobazam, lamotrigine, levetiracetam, oxcarbazepine and topiramate. These medications rarely stop the seizures completely but reduce the frequency and severity of them.
I hope this helps, my prayers are with you and your son.