t find a workable dosage of phenobartibal, you might want to ask your vet about either Dilantin, Valium, potassium bromide, felbamate, or a different type of anti-seizure medicine that can be used in conjunction with potassium bromide and/or phenobarbital together called
Zonisamide.
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.