Rifaximin is the prescribed antibiotic but doc is still working with insurance to get it covered. So he hasn’t started it yet. No breath test has been administered to diagnose SIBO so this very expensive antibiotic is being used for diagnostic purposes - trial and error approach. I am also confused how his last GI doc diagnosed collagenous colitis and this new doc said the biopsy didn’t show that. I’m wondering if anyone else has had this diagnosis reversed.