Hi,
i see you posted this message quite a while ago. I've just come across it now, so I hope I will still be of help.
There is a forum about epilepsy. I don't know if your child has been diagnosed, but even if he hasn't people on this forum might be able to answer questions for you if you haven't tried there already. I have epilepsy myself but know nothing about the drug your child is on, so I can't offer a whole lot to you. However, as I say there is a forum about epilepsy that you may find helpful. Good luck!