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Antibiotics frequently associated with increased CDI risk include clindamycin, fluoroquinolones, cephalosporins, and penicillins. Rarely associated antibiotics are tetracyclines, metronidazole, aminoglycosides, vancomycin. For oral bacteria, vancomycin is best. But oral vancomycin is not effective for oral bacteria. You need to have iv of vancomycin prior to the dental work.