Calcium Caltrate, one in the pink bottle. Read about it on the IBS forums. It's literally a cure for IBS with D. Start off twice a day. I only use it once a day now and it's literally a cure!!! What it does it causes the stools to harden up. It cures most people. Just don't take too much or it clogs you up. But yea, once a day for me, but I'm a skinny guy. You won't need Immodium or anything ever again.
It's a calcium supplement so good for the bones too. If it wasn't for that I wouldn't be able to hold a steady job. I can't believe my stomach doctor didn't mention it until I told him about it and he told me. Probably so he could push prescriptions on me.
Really, the sh** will improve your dating life and all. Won't have to worry about gas pains and explosions anymore when you go out and about.