hello, I have been on Bentyl (or generic form thereof) for 18 yrs. It works and sometimes it doesn't. I'm not very faithful about taking it before meals, so I try to do patchup work when "it" hits me. Also, I think that after all of these years I've become immune to it. My best results have come from a combination of changed diet, great fluid intake, excercise and relaxation.
There are several other drugs out there to help control IBS. If this doesn't work for you, be open with your GI doc.
Best wishes,
Rockie