Hi There, I am Jen. I am just new to IBS-C (lucky me) ughh. I have had it going on about 4 months, serious so far. I was put on Zelnorm and have been on it about 1 month. I noticed when I had an attack, it seemed to stop working. I have been religious with acacia fiber too, but I feel Zelnorm may stop working all together. How long were you on it until it stopped. Also, I want to get my hand on Digestive Advantage. Thanks