Zonisamide is totally unrelated to any of the other anticonvulsants, but, like Keppra, the full extent of its side effects is not yet known so to some vets, it is somewhat controversial to prescribe it.
Dilantin, Valium, potassium bromide
and felbamate, along with phenobarbital, are all tried and true when it comes to treating idiopathic epilepsy.