That's great news about Rider! It sounds like you have found the magic bullet that works for him!
On our last regular visit with the neurologist, Pandora had gone 6 weeks without a seizure and he had said that he would be satisfied if she could consistently go 6 weeks. He didn't change any of her meds at the time. Her liver function studies were within normal range and her phenobarbital was 31mcg/mL.m (therapeutic level ranges from 15 - 35).
She's on phenobarbital, Keppra and zonisamide. She gets 1.0 mL of midazolam intranasal immediately post-seizure to stave off clustering, plus she gets an additional full compliment of her other meds, even if I just gave them to her. I'm not sure what more can be done for her and it might just be that this is her lot in life. She goes back to the neurologist in about a week to have blood work done for another phenobarbital level.