I am an over sweater, and tried everything to make it stop. I even got prescription strength Certain-Dry from my doctor, it has a higher amount of aluminum chloride in it then OTC CD. However, it was so uncomfortable, it made my pits itch so bad and it actually bled out the dye in some of my clothing. I also started getting some weird cyst like bumps in my underarms as well.
I started getting botox in my pits about 3-4 years ago to stop the sweating. It works like a charm and is completely covered by my insurance. I get it done every six months, and I have no more sweating.
I still have to wear deodorant because even with no sweat after a few hours I can notice a body odor.