My first Giant started having seizures at 1.5 yrs of age. It was heartbreaking to have a young dog diagnosed with epilepsy. She was on Phenobarb and Potassium Bromide. I don't remember the dosage as it was 8 yrs ago.
As others have said the side effects of the meds can be worse than the seizures. The KBr did a number on her already dysplastic hips.
Every dog is different. Your dog may not have any more seizures.
I wish you the best with Cody.