epilepsy
"Started with Depakote upon being diagnosed with Juvenile Myoclonic Epilepsy in my teens.  I took it for years without issue.  I decided to switch to Keppra XR because of potential liver issues with Depakote and the somewhat tiresome redundancy of labwork related to Depakote use.  Keppra XR did not work for me as my memory began growing progressively worse and I could not think clearly.  I also began losing my train of thought mid sentence fairly often.  Switched back to Depakote ER, and am feeling much better mentally.  The quarterly labwork is not a big deal when compared to being in a mind fog for over a year.  That's my experience, hope everyone finds what's right for them.  P.S. I do not take generics, noticeably more side effects."