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Expected pharmacological effect
Causality assessment · Expected pharmacological effect
Nifedipine (dihydropyridine CCBs) and Peripheral oedema: is the FAERS signal real?
A written Bradford Hill assessment of one drug–event pair. The grade is a judgement about the signal, not a statement that this drug causes this event in any one person; FAERS counts are reports, not rates.
Nifedipine (dihydropyridine CCBs) ↔ Peripheral oedema
n=1,063 co-reports · PRR 3.9 · ROR 4.0
Nifedipine and other dihydropyridine calcium-channel blockers dilate the small arteries more than the veins, so fluid shifts into the tissues of the ankles and legs — a predictable, dose-related consequence of the mechanism rather than an idiosyncratic reaction. The swelling is a common reason patients stop these drugs, and it is not a sign of heart or kidney failure itself. The 1,063 co-reports (PRR 3.9) reflect both the real effect and the very wide use of these drugs for hypertension and angina.
Regulatory basis: nifedipine prescribing information (peripheral oedema as an adverse reaction). Established dihydropyridine-oedema literature.
| Bradford Hill viewpoint | Status | Note |
|---|---|---|
| Temporality (necessary) | met | Oedema develops during treatment and resolves after withdrawal |
| Strength | met | PRR 4 on a large co-report count |
| Consistency | met | Reproduced across dihydropyridine trials |
| Specificity | met | A class effect of dihydropyridines, rare with verapamil/diltiazem |
| Biological gradient | partial | Dose-related |
| Plausibility | met | Precapillary arteriolar dilation raising capillary pressure is the mechanism |
| Coherence | met | Coheres with the labelled oedema and the practice of adding an ACE inhibitor/ARB |
| Experiment | partial | Dechallenge (withdrawal) usually resolves it; no randomized trial |
| Analogy | met | Analogous to oedema with amlodipine and other dihydropyridines |
This page's own qualitative read, not an automated/citation-gated assessment.
✗ No ClinicalTrials.gov results-posting trial in the top search hits for nifedipine captured peripheral oedema as a coded event; the effect is managed clinically and characterised in antihypertensive trials rather than a single trial AE table.