My newest gastroenterologist in CO suspects microscopic colitis and prescribed Cholestyramine as needed, i.e., when urgent diarrhea occurs. Unfortunately, scheduling of an upper endoscopy and a colonoscopy isn't until mid-November - when hopefully there will be confirmation of his suspicion or identification of some other diagnosis. [I have a long history of IBS with chronic diarrhea, polyps, SIBO, GERD, esophageal nodules, gastritis, hiatal hernia.] One thing that has helped me control diarrhea in the past was OTC activated charcoal (2 capsules) when Imodium, Pepto-Bismol, Kaopectate, etc. did not