<<Disclaimer: Verify this information before applying it to your situation.>> I am on Zithromax for bronchitis. I am having a terrible gluten like reaction. This is the second day and I have to take it 3 more days. I called the company and they said there is no gluten in this product. My doctor says the antibiotic strips the intestine of all bacteria and this causes the diarrhea. Has anyone else had trouble taking Zithromax? Are there antibiotics that you take that don't cause these symptoms? Thanks, MC