Dicyclomine
"This medication didn't work for me and it gave me some pretty bothersome side effects.  I was only taking one 20 mg pill a day for a couple weeks. It made me very loopy and tired.   The side effects I had were several severe hot flashes per day.  Night sweats. Chest pain that would last a couple hours until I would randomly belch and it would instantly disappear.  Stopped taking it and all side effects disappeared.  I will never take that pill again."