I've been on Topamax for 2 months and I've missed one period.  The first month I was on Topamax it came too early and was short and light.  This is my second time on Topamax and my symptoms are different from the first time.  I don't have the tingling in my feet and hands like I had a year ago when I was taking it.  I now have numbness in my lips and head.  I still don't like the taste of carbonated drinks.  I have difficultly concentrating and lose train of thought.  I lost my sex drive before when I was taking it.  So far it seems like it's increased. I seemed agitated when taking it before, but now I don't.