What is the purpose of stability assays?

• A. The shelf life and proper storage conditions to maintain activity.
• B. The rate of chemical degradation under all conditions.
• C. The initial amount of active ingredient.
• D. The method to measure concentration in solution.

Answer: (A)

Stability assays determine how long a product remains within defined quality and potency under specific storage conditions. The goal is to establish expiration dating and the storage requirements that keep the product effective and safe throughout its shelf life. These tests monitor changes in activity, purity, impurities, and physical attributes over time under set conditions (temperature, humidity, light) and often include both real-time and accelerated studies to predict long-term behavior and identify degradation pathways. This focus makes stability testing essential for deciding how long a product can be used and how it should be stored, rather than simply measuring degradation under all possible conditions or assessing the initial amount.