I am on 3000 mg/day of keppra along with 2 other meds (zonegran and topamax).
The good thing about keppra is that it is not known to interact with other meds. You also can jump right to a therapeutic dose..1000 mg a day, if your doc decides to go that route. Mine did, and I remember being tired the first week or so, but no horrible side effects. I didnt have any mood issues until he tried to raise it to 4500 at one point, then I got cranky ! As soon as we went back down to 3000 tho, I didnt have that problem anymore.

I hope it works for you !
Pam