Kathleen's GI dr. has diagnosed her with intestinal bacterial overgrowth. He put her on Xyfaxin twice and it seemed to help her symptoms but when she was weaning off the symptoms returned. She's now on the third round of this antibiotic. I'm not sure how I feel about all these antibiotics. She doesn't seem to have any side affects from it, and it does seem to help. I don't think I would agree to another round if it comes back this time. From what I've read it may take more than one round to get rid of this.