At the age of 66, I was out of touch with children, over a 4-5 day period of time, I began having seizures, petite mal in nature, mostly facial. I was taken to ER where they ran complete battery of tests. As a child I had several severe head injuries. I was put on Keppra. After 2 months, I began to come out of the darkness. Last week, even though the 500mg tabs had been working well, The neurologist increased the dose to 1000mg bid. What side affects might I experience with this increase? Diarrhea? Any others? I have never had problems as a result of the head injuries