Clindamycin and Clostridioides difficile colitis: is the FAERS signal real?
Clindamycin ↔ Clostridioides difficile colitis
Clindamycin is the antibiotic most closely linked with Clostridioides difficile infection: by disrupting the normal gut flora it allows this spore-forming bacterium to overgrow and produce a toxin-mediated colitis. It is a genuine, well-understood consequence of antibiotic exposure rather than an idiosyncratic drug reaction, and it can range from mild diarrhoea to life-threatening pseudomembranous colitis. The 409 co-reports (PRR 14.3) reflect both the real association and the breadth of antibiotic prescribing.
Regulatory basis: clindamycin prescribing information (C. difficile-associated diarrhoea and colitis warning). Established antibiotic-associated colitis literature.
| Bradford Hill viewpoint | Status | Note |
|---|---|---|
| Temporality (necessary) | met | Colitis typically follows antibiotic exposure by days–weeks and responds to stopping the drug |
| Strength | met | PRR 18 on a moderate co-report count |
| Consistency | met | Reproduced across antibiotic classes but historically strongest for clindamycin |
| Specificity | met | Antibiotic-associated colitis is a recognised syndrome, though several antibiotics can cause it |
| Biological gradient | partial | Risk broadly rises with longer or broader antibiotic courses |
| Plausibility | met | Disruption of gut flora permits C. difficile overgrowth and toxin production |
| Coherence | met | Coheres with the standard warning and the advice to test and treat |
| Experiment | partial | Dechallenge (stopping the drug) with appropriate treatment usually resolves it; no randomized trial |
| Analogy | met | Analogous to C. difficile colitis from other broad-spectrum antibiotics |
This page's own qualitative read, not an automated/citation-gated assessment.