I use Drysol on my hands a few times a week and it works great. I take ballet classes and sweat a lot but my hands are fine. sweaty hands have always been an embarrassing issue but i never have that problem anymore. it does, however, make my hands crack and peel. you can also use it on your armpits and feet.

I'm not sure if they sell it in the US (I live in Canada) You might need a prescription, but it's definitely worth a try.