I experienced the same thing a few years ago. After a chronic sinus infection, I started Omnicef. I now consider myself allergic to it. I had such bad stomach pain and diarrhea that I had to take off work for a week - and the problems continued for about three weeks. It had gotten so bad, my next step was a colonoscopy and yet another antibiotic, Flagyl, to clear up my intestinal problem. I saw my OB for another issue and told him about it. He recommended acidophilus, which I started the next day, and it totally cured me. Yogurt doesn't do the trick because of the dairy -- but the acidophilus Pearls worked really, really great. I keep them in my fridge now always! Good luck.
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