Monday afternoon I was diagnosed with IBS-C, and given a script for Zelnorm. I took one pill right away, and then one hour to the minute after taking it I had diarrhea. Then Tuesday morning I took a pill, and about an hour later had a soft BM, but not diarrhea. Tuesday afternoon I took a pill, felt the need to go, but couldn't. Then this morning I took a pill and the same thing - felt the need to go but nothing. Isn't Zelnorm supposed to stop constipation? I have to get some blood work done in about an hour (fasting), so maybe after that I'll grab a cup of coffee and see if that helps. But I was wondering if I should be concerned about this at all? Thanks.