Hi there,
I'm so sorry your son is going through that. I could only imagine it is trying. If the medication isn't working please keep the doctor informed. I know everytime I have had breakthrough seizures, I've kept my doctors in the look. Let them know what's going on with your son. They should be able to give you an alternative medication and monitor the seizure activity.
Keep us posted on how everything goes.
Here are a few articles:
https://epilepsydisease.com/treatment
https://epilepsydisease.com/living/seizure-rescue-medication
Sincerely,
Derra Howard
Epilepsy Team Member