Hi, I recently changed to SR Metformin because of the same problem. I have also started drinking Actimel as it is supposed to help increase the healthy bacteria in the gut. I have had a slight improvement but I still make sure I have Immodium handy at all times! I should have shares in the company I think. I have an irritable bowel in general (not IBS) and have to be careful how much fruit and veg I eat (hardly any) which isn't very helpful when trying to eat a healthier diet. Hope your problem improves with the SR Metformin.