Mine is on HUGE doses of Keppra and he was having them every two to three weeks, so they added Bromide. I don't think the Keppra works for him at all, but they won't take him off of it unless he goes months without one. Keppra is expensive!!! He did great on Pheno, didn't have one for the 4 1/2 months he was on it. But then it tanked his white blood cells to the dangerous level. this is rare though, Pheno is often a go to for most dogs.
Five weeks is not great LOL, they should really not have more than one every 3-4 months, but my vet is now shooting for 6 weeks with him, since we are not under control :-(