Beware > Tingling.
I took it for migraines too, up to 100mg / day. About 2 years. I started out with tingling just mild sometimes my hands, fingers or feet. and just shaking it would go away after a few minutes. Then my wrist started hurting, and numbness was getting worse. I even quit doing my computer cause of it. My hand hurt more and more, > up to my shoulder it got so bad. They where sure I had carpl tunnel syndrome, and thinking about surgery. I was wearing a brace, and starting to wonder what I was going to do at work, my hand was so weak. Then my neuro got involved for the testing I needed, and she said its the topamax! I said it started with tingling but now its really painful, I had swelling my hand was 1/4 larger than it had been, could not wear braclete I had prior etc... I was protecting that hand and doing everything left handed, trying to write even? She said stop the topamax 3 days later it was almost completely cured and a week later the swelling was hardly noticable. So if your getting tingling, keep an eye on it.
I didn't know about the heat thing either, but makes sense my last few trips I thought the heat was worse / but chalked it up to getting older? 40 something? I never normally took a nap at disney, good time to get stuff done while they napped. And I was the first to suggest a nap last august.
Weight loss, maybe 5# and didn't gain anything but that was it. Of course, those of us that wanted that one, didn't get it.
mky