21 CFR §211.166
Every DSRV article whose Regulatory Snapshot cites 21 CFR §211.166: the enforcement case behind it, the inspection exposure it created, and what the desk would do about it.
- What has FDA cited under 21 CFR §211.166?
- 2 DSRV articles cite 21 CFR §211.166. Enforcement cases behind them: ICH Q1A(R2) stability data expectations and FDA review practice for retest period and shelf-life justifications under 21 CFR Part 211; Recurring FDA stability program observations under 21 CFR §211.166 and excursion-handling expectations informed by ICH Q1A(R2). Inspection exposure across them: 2 moderate.
- What does DSRV recommend for 21 CFR §211.166?
- From the newest article (What Evidence Supports a Stability Justification?): A shelf-life justification is an evidence argument - long-term data, demonstrated stability-indicating methods, and trend analysis, not a stack of individually passing results. DSRV is decision support, not legal advice; verify against the official source each article names.
- 8 min readModerate exposurecited as a tag
What Evidence Supports a Stability Justification?
A shelf-life claim is only as strong as the stability evidence behind it. We outline what ICH Q1A(R2)-aligned data, trend analysis, and supporting studies actually substantiate a justification.
- Case
- ICH Q1A(R2) stability data expectations and FDA review practice for retest period and shelf-life justifications under 21 CFR Part 211.
- DSRV take
- A shelf-life justification is an evidence argument - long-term data, demonstrated stability-indicating methods, and trend analysis, not a stack of individually passing results.
- 7 min readModerate exposure
When Stability Data Gaps Become Inspection Exposure
Not every stability gap is equal. A missing time point, an unmanaged excursion, or an under-powered trend can quietly become an inspection finding. Here is how to triage which gaps create real exposure.
- Case
- Recurring FDA stability program observations under 21 CFR §211.166 and excursion-handling expectations informed by ICH Q1A(R2).
- DSRV take
- The inspection question is never whether gaps exist - it is whether each gap weakens the shelf-life justification and whether you documented how you managed it.
Pressure-test your evidence before an inspector reads it
Bring the document that has to hold up under 21 CFR §211.166. DSRV maps the evidence, names the gaps, and routes judgment calls to human review. Controlled intake, no public file upload.
Regulatory intelligence and interpretation, not legal advice. Verify against the official FDA or ICH source each article names.