Yes, we just talked about Keppra on another thread just a few days ago.
There are quite a few different doses your doctor might start you on. It can range anywhere from 500mg. twice a day, up to 1500 mg twice a day. I started low (just because I have a sensitivity - and aversion - to drugs in general), but titrated upward. I'm currently taking 1000 mg. twice a day.
I wouldn't be able to walk without it.