Hyoscyamine
"Hyoscyamine has largely worked for me, but not all the time. Diagnosed with Irritable Bowel Syndrome 1991. Dr started me on Levsinex (hyoscyamine) 0.375mg twice per day. I take one in the morning and one before noon. Dr also prescribed methylcellulous fiber to "train" my colon, which I've been taking once at night before bed. Psyllium fiber gives me chest pain. I stay away from fried and fatty foods, dairy, alcohol, but I do cheat a little when I'm safe at home. I have been tracking my "episodes" which seem to occur once per month, but are still wildly unpredictable. I'll go 3 times in one hour. Severe cramps, intestines sound like a pinched garden hose; a complete purge of the colon. "