Every shelf-life claim on a pharmaceutical label rests on a stability study. For sterile liquids in polymer FFS containers the study also has to prove that the container itself — not just the formulation — holds up over time.
The ICH framework
The International Council for Harmonisation (ICH) guideline Q1A(R2) defines the standard study design:
| Study | Condition | Minimum duration |
|---|---|---|
| Long-term | 25 °C / 60% RH (or 30 °C / 65% RH for zones III–IV) | 12 months at submission |
| Intermediate | 30 °C / 65% RH | 6 months |
| Accelerated | 40 °C / 75% RH | 6 months |
India falls in climatic zone IVa/IVb (hot and humid), so long-term studies for the domestic market run at 30 °C / 65% RH or 30 °C / 75% RH.
What is tested at each pull
For a product such as Sterile Water for Injection or Normal Saline, typical time-point tests include appearance, pH, conductivity or assay, particulate matter, bacterial endotoxins, sterility (at selected points), extractables from the polymer, and — critically for FFS — container integrity and weight loss, because water vapour can permeate plastic slowly over years.
Stability chambers
Samples sit in validated stability chambers that hold temperature and humidity within tight tolerances and log both continuously. Chambers are mapped before use and alarmed so that an excursion is documented, investigated and, if necessary, the affected time-point repeated.
Why it matters when you choose a manufacturer
A contract manufacturer with an ICH stability programme already running for the presentation you need can shorten your registration timeline by a year or more. Swanya runs stability studies for all target markets as per ICH requirements in its in-house QC laboratories — see Quality Control or ask us about existing data on the contact page.
