I take it you have constipation?
I take Zelnorm too. But Zelnorm by itself is not enough. If you combine Zelnorm w/Citrucel you will do much better. You can change your bowel habits from once every 3 days to closer to once a day or at least every other day.
Eat more fiber. I am realizing fiber really helps IBS.
Take accidophilus too because you will get some toxins from IBS and accidophilus will help