I've been on Topamax (150mg/a day) for 4 years for migraines. At the start I had some of the common side effects: dropping things, memory loss, mood swings, weight loss. The weight loss evened out in the first year or so, and the other side effects went away in the first few months-mainly after my Dr. had me take it as one dose only at night, and increase the amt. of water I drink. I am still on it, and they just increased my does to 300mg/ a day for chronic pain. So far, no weird side effects, but I'll wait and see. I'm sure anything is possible. But after trying everything before for migraines, this was the only thing that worked, and was worth riding out a few months of side effects. I was honest with family and coworkers when I did dumb stuff, or had off the wall mood swings and got through it. Guess I may have to do the same thing again. Reading on her some many bad experiences, I hope some of the people starting it or thinking about, will give it a chance to work. I was desperate and so out of options, I am so glad that I did.