My son, 18,takes 3000 mg of Keppra XR. Today Vimpat was added. I know nothing about this medication. He will start at 100 mg daily and work up to 200 mg after a week. I don't know anything about this medicine. Please give me your input, experiences, and side effects with it. Thanks. BTW, my son has just started living on campus at college. Should I have any concerns with adding this medicine while he is not home?