Dicyclomine
"This medicine has literally changed my life.  I went from being afraid to go out to eat because I didn't know how my body would react, to being able to eat anything I want at any time without any stomach upset.  It made my mouth really dry when I first started taking it, but that went away within a week.  Slight additional drowsiness on occasion.  I also get drunk very quickly when drinking alcohol on this medication.  Those are the only downfalls - but they're so worth it."