Free Tool

ICH Stability Zone Finder

Select a country to find its ICH climate zone classification and the required storage conditions for pharmaceutical stability testing.

How it works: Type or select a country from the dropdown. The tool instantly shows you the ICH climate zone (I through IVb) along with the exact long-term and accelerated storage conditions defined by ICH Q1A(R2) guidelines. Use this to determine the correct stability study parameters before submitting your product for regulatory approval.

Complete ICH Zone Reference

ZoneClimateLong-termAccelerated
Zone ITemperate21 °C / 45% RH40 °C / 75% RH
Zone IIMediterranean / Subtropical25 °C / 60% RH40 °C / 75% RH
Zone IIIHot / Dry30 °C / 35% RH40 °C / 75% RH
Zone IVaHot / Humid30 °C / 65% RH40 °C / 75% RH
Zone IVbHot / Very Humid30 °C / 75% RH40 °C / 75% RH

Understanding ICH Stability Testing Guidelines

The International Council for Harmonisation (ICH) divides the world into climate zones based on temperature and humidity patterns. These zones determine the conditions under which pharmaceutical products must be tested for stability before they can be registered in a given market.

Stability testing is a critical requirement for pharmaceutical regulatory submissions globally. The data generated from these studies directly determines the shelf life printed on your product packaging and the storage instructions provided to pharmacists and patients.

For companies targeting multiple markets, understanding which ICH zone each country belongs to is essential for designing an efficient stability programme that covers all intended registrations without unnecessary duplication of studies.

Key ICH Stability Guidelines

  • ICH Q1A(R2): Stability testing of new drug substances and products — the primary guideline defining zone conditions and study design.
  • ICH Q1B: Photostability testing — requirements for light exposure studies.
  • ICH Q1C: Stability testing for new dosage forms — applies when a new formulation is developed.
  • ICH Q1D: Bracketing and matrixing designs — approaches to reduce the number of samples tested.
  • ICH Q1E: Evaluation of stability data — statistical methods for shelf-life estimation.

Frequently Asked Questions

What are ICH stability zones?
ICH stability zones are climate classifications defined by the International Council for Harmonisation (ICH) to standardise pharmaceutical stability testing worldwide. There are five zones (I, II, III, IVa, IVb) based on temperature and humidity conditions. Each zone specifies the long-term and accelerated storage conditions under which drug products must be tested to determine their shelf life.
Which ICH stability zone does India fall under?
India falls under ICH Zone IVb (hot and very humid). This means pharmaceutical products marketed in India must be tested at 30 °C / 75% RH for long-term stability and 40 °C / 75% RH for accelerated studies. These are the most stringent storage conditions among all ICH zones.
What is the difference between Zone IVa and Zone IVb?
Both zones are classified as hot climates, but they differ in humidity. Zone IVa (hot/humid) requires long-term testing at 30 °C / 65% RH, while Zone IVb (hot/very humid) requires 30 °C / 75% RH. The higher humidity in Zone IVb is more demanding on product stability, particularly for moisture-sensitive formulations.
How long should ICH stability studies run?
Long-term stability studies should run for a minimum of 12 months at the time of submission, with a commitment to continue until the proposed shelf life. Accelerated studies run for 6 months. Intermediate conditions (30 °C / 65% RH) are used for 12 months when significant change occurs during accelerated testing.
Does Auriga Research conduct ICH stability testing?
Yes. Auriga Research operates NABL-accredited stability chambers across all ICH zones. We run long-term, intermediate, and accelerated stability studies in compliance with ICH Q1A(R2) guidelines. Our stability testing services include photostability (ICH Q1B), stress testing, and in-use stability studies.

Related Services

Stability Testing Services ICH-compliant long-term, accelerated, and photostability studies Pharmaceutical Testing Complete analytical and quality testing for drug products

Need Stability Testing for Your Product?

Our NABL-accredited lab runs ICH-compliant stability studies across all climate zones. Get a quote for long-term, accelerated, or photostability testing.

+91-7428116100 Request Stability Testing Quote

Type to search services, tests, and locations…