High risk | Medium risk | Low risk |
Cephalosporins | Ampicillin/amoxycillin | Aminoglycosides |
Clindamycin | Co-trimoxazole | Metronidazole |
Macrolides Tetracyclines | Anti-pseudomonal penicillins ± β-lactamase inhibitor | |
Quinolones | ||
Rifampicin | ||
Vancomycin |
These subdivisions may be prone to bias because of the relative frequency of use of agents and the complexity of interaction between antibiotic exposure, C difficile, and other factors.