I haven't found any meds that really help with my IBS-C. I took Bentyl when I was A and it helped then, but it actually seemed to constipate me once I became C again so now I only use it during attacks. For me diet, soluble fiber, hypnosis, and yoga have been the most helpful things, although I'm still working on it. I wish I could have better news! Some people have great luck with drugs, though, so they're worth a try!
-------------------- "Anyone can exercise, but this kind of lethargy takes real discipline." -Garfield