Keppra is known for causing these side effects, so it could be the medicine. The fact that you notice the change is a sign that the Keppra is what is causing the change in your personality. Remember, this medicine is intended to alter your brain's activity, so there will be consequences. What you have to keep in mind is are your seizures getting better? Most people notice an improvement with these side effects within a few months, but it is also known that many have been on Keppra for years and still have these side effects. Talk to your doctor, maybe your dosage can be changed, maybe there is something else you can try. Keppra is not the only anitconvulsant on the market, but it is seen as the golden child for many doctors. Also, be mindful that you may not have to fight this alone. If you have family, friends, a support group you can turn to, keep them informed of how you are feeling. That way when you fly off the handle they understand what is motivating your anger. Try simple breathing techniques and removing yourself from the situation when you feel your anger rising. But above all, talk to your doctor, and if your doctor does not listen, find one that will. It can be hard to find a good doctor, but do not give up. And more importantly, don't give up on yourself. Remember the basics of epilepsy...eat right, get sleep, exercise, and educate yourself.