I suffered a lot of gnarly side effects while I was on Topomax - I think I took it for several weeks before I finally figured out and decided that I needed to get off of it. Some of the side effects were an increase in confusion and a decrease in my speaking ability. It was over a year ago that I took it so I can't quite remember all of them or the real details. Despite that, I distinctly remember that the side effects made me extremely anxious and after it was finally out of my system I had a sense of relief and less stress to deal with on a moment by moment basis.