I had a Dalmation (Jake) for 6 1/2 years that was epileptic. He was prescribed 2 Primidone pills a day. As his seizures increased in frequency & intensity, the prescription was upped. When he reached 5, his seizures were out of control & he was prescribed Potassium Bromide in liquid form. This kept things under control for the most part. He would have monthly cluster seizures---maybe 5 in one day but none for a month or more.
The Primidone can cause liver damage so Jake had blood work every year to test his liver enzyme level. It was always fine.
The important thing is to have a good vet. We lost our Jake 3 weeks ago to pancreatitis and I think our vet could have provided better care (or at least more compassion) in his last days.

Good luck. It's heartbreaking and scary.