Side effects are different for everyone, but I think that if you're going to get them with Topamax, you're going to get them right away. I was on Topamax all of 2007, off 10 months, and just recently went back on it (long story, not applicable). I have Bipolar 2, BPD, and PTSD. Main side effects for me are carbonated drinks taste AWFUL! I try to ... more