I am bipolar and I have been taking topamax for about a year now. I am very small so I only need 50 mg, but it has worked wonders. Before this, I was medication-free after an awful cocktail of abilify, concerta and ambien. AWFUL. I gained a ton of weight; I still couldn't function during the day or sleep at night; I was still suicidal with racing thoughts.
Anyway, I know it doesn't work for everyone, but the topamax has made such a difference in my life. This is the first time I feel functional and "normal," as it were. The only side effects were weight loss (yay!) and a week or so of drowsiness after raising the dose. But I feel great now. I've stopped hallucinating. I've also stopped cycling...no more mania or depression.

I can function on the daily and I can sleep.
I read a lot of things that say topamax isn't effective in treating bipolar, but it's been incredibly effective for me so don't write it off as an option!