Oxybutynin
"I have been on Oxybutynin for hyperdydrosis since September of 2013.  It has changed my life.  I went to Mexico this past December and was amazed at how much less was sweating I had.  Prior, I was becoming a recluse as it was so embarrassing to go out in public.  My air conditioner ran non-stop all summer!  Every now and then I "break" out in a sweat, but it is mild and not a big deal.  The one side effect I have with it, is that `after taking 2 x 5mg a day I get extremely tired and feel kind of like  I am "out of it".  I now take it at bedtime, as it actually helps me fall asleep quicker (I had terrible insomnia as well).  Mouth is very dry, but it has forced me to increase my water intake, which is good anyway.  This is such a relief!"