You should ask a doc about that. I don't take that stuff because it gives me diarrhea. I do take Imodium quite often, though. The gastroenterologist I used to see never gave me anything that worked better than Imodium for my attacks. He also wasn't particularly helpful in the diet department. He just seemed interesting in ruling out anything serious and once he confirmed the IBS diagnosis, he had no advice for me other than trying to cut down on stress and take Imodium when I need it. I found the Eating for IBS program and probiotics through my own research.

I made up a little poem about how miserable my IBS is making me feel today. It's always bad when I get my period.

My unwelcome companion IBS
Doesn't play well
With hormones and stress.