Procedure for Stability Testing of Drug Products Stored at Subzero Temperatures

1) Purpose

The purpose of this SOP is to establish a procedure for conducting stability studies for drug products stored at subzero temperatures in compliance with relevant regulatory guidelines. This ensures that these products maintain their quality, safety, and efficacy throughout their shelf life under subzero storage conditions.

2) Scope

This SOP applies to all personnel involved in the stability testing of drug products requiring subzero temperature storage, including formulation development, quality control, and regulatory affairs teams.

3) Responsibilities

Formulation Development Team: Responsible for developing drug formulations suitable for subzero storage.
Stability Study Team: Responsible for conducting stability studies as per approved protocols under subzero conditions.
Quality Assurance Team: Responsible for reviewing stability data for compliance with regulatory requirements.

4) Procedure

4.1 Protocol Development

4.1.1 Develop a stability testing protocol that specifies

storage conditions, such as -20°C or lower, and testing intervals (e.g., 0, 3, 6, 12 months).

4.1.2 Include parameters such as assay, degradation products, appearance, and container closure integrity under subzero conditions.

4.2 Sample Preparation and Storage

4.2.1 Prepare samples in their final packaging for stability testing.

4.2.2 Store samples under controlled subzero temperatures using validated