The first thing to be noted is that people respond idiosyncratically to medications. Zoloft may cause diarrhea for person X while person Y attains constipation. In addition, people respond differently to SSRI's. A person may respond to Zoloft, yet that same person may find Prozac to be an inefficacious medicine.I have found Zoloft to be a Godsend. It significantly ameliorated my intestinal health. I attribute said response to the anxiolytic properties of Zoloft; Zoloft has allayed many of my worries. For me, being less anxious translates into a happier tummy. The pathology of IBS is hotly debated. Gastros will tell their patients reassuringly "It's not all in your head." I submit, however, that IBS possesses dual origins - the gut AND the mind. My humble opinion is that most of the blame lies with the mind. I believe IBS can be minimized with a change in diet, the addition of exercise, and a major focus on spirituality. It worked for me.