Keppra was my first E-med. On the plus side, I did not have a seizure the 3 months I was on it. On the minus side, it made depressed and angry - B6 helps with that. Keppra did not make me sleepy, and did not affect my balance. Because I wanted off Keppra I asked to try another med and was put on Lacosamide (Vimpat). I was on Vimpat for about a week, missed one dose, and had a seizure the next day. Up until I missed my dose and had a seizure, Vimpat seemed fine. Hard to tell if it is the Vimpat or the recovery, but memory and balance are off, hopefully will improve. See neurologist in a few days, may be back on Keppra.