I have the worst underarm sweat problem of anyone! No problem with smell, but I can ruin shirts in the first 5 minutes. I’ve tried Certain-Dri…doesn’t work for me. I notice that Secret (I think…) has a new anti-perspirant that’s “prescription” strength. Has anyone tried it? Can anyone recommend anything? Thanks!
Cardigan, turtleneck or pullover? 
I’m a turtleneck!*
I discovered (after quite a while) that I was somehow allergic (or something) to anti-perspirant - it actually made me sweat a lot more. So I switched to plain deodorant without the anti-prespirant, and have been half way normal since.
Also, there was a thread from way back that referenced a hard to find, possibly european product called, chloro- something or another, my memory is foggy about it. But it is supposed to clog up or kill your sweat glands. I don’t know what to search for to find it.
*On preview, QED’s quicker than I.
Drysol, aluminum chloride hexahydrate, although that name may have changed.
Whatever you do, don’t get thoracic sympathectomy surgery.
There is a post here
http://boards.straightdope.com/sdmb/showpost.php?p=8376408&postcount=25
about a bad outcome for another sweaty doper.
I’m surprised Certain Dri doesn’t work for you. Are you following the directions? Putting it on before bed, not in the morning? If you are, do you shower at night or in the morning? It doesn’t work to shower at night and then put it on.
Do a search on “hyperhidrosis.” It’s been discussed a few times here, although I’m not sure there’s ever been a clear consensus on the best solution. If it’s a serious problem for you, there is a lot of evidence that Botox injections work well for most sufferers.
Still the same name.
Highly recommended by this sweater.