quality control, research and development, and regulatory affairs departments.

3) Responsibilities

The responsibilities for conducting stress testing of APIs are as follows:

• Quality Control Team: To conduct stress tests as per the protocol and document results.
• R&D Team: To design the stress testing protocol and provide technical support.
• Regulatory Affairs Team: To ensure compliance with regulatory guidelines during stress testing.
• Stability Study Coordinator: To manage testing schedules, sample management, and data analysis.

4) Procedure

The detailed stepwise procedure for conducting stress testing of APIs is outlined below:

1. Preparation of Stress Testing Protocol:
1. 4.1 Define the purpose, scope, and objectives of the stress testing for APIs.
2. 4.2 Identify the API and its critical quality attributes (CQAs) to be monitored (e.g., potency, degradation products, physical changes).
3. 4.3 Determine the stress conditions to be tested, such as:
• Thermal Stress: Expose the API to elevated temperatures (e.g., 40°C, 60°C) for a specified duration.
• Photolytic Stress: Subject the API to light exposure in accordance with ICH Q1B guidelines.
• Humidity Stress: Expose the API to high humidity conditions (e.g., 75% RH) for a specific period.
• Oxidative Stress: Treat the API with oxidizing agents (e.g., hydrogen peroxide) to assess oxidation stability.
• Hydrolytic Stress: Expose the API to acidic, basic, and neutral conditions to study hydrolysis stability.
4. 4.4 Establish the time points for sample collection at each stress condition (e.g., 1, 2, 4, 7 days).
5. 4.5 Develop a protocol outlining the procedures, equipment, and materials required for testing.
2. Sample Preparation and Storage:
1. 4.6 Select representative samples of the API for stress testing.
2. 4.7 Prepare samples as per the stress testing protocol (e.g., dissolve in appropriate solvents, adjust pH).
3. 4.8 Store samples under specified stress conditions in appropriate stability chambers or controlled environments.
3. Testing and Monitoring:
1. 4.9 Retrieve samples at predefined time points and perform the required tests (e.g., HPLC analysis, spectroscopic methods).
2. 4.10 Record all test results in a stress testing log sheet.
3. 4.11 Compare the results against predefined acceptance criteria and identify degradation products.
4. Data Analysis and Interpretation:
1. 4.12 Analyze the stress testing data to determine degradation pathways and identify the potential impurities formed.
2. 4.13 Assess the impact of different stress conditions on the stability of the API.
3. 4.14 Document any significant findings, such as unexpected degradation products or rapid degradation.
5. Documentation and Reporting:
1. 4.15 Compile a comprehensive stress testing report, including objectives, methods, results, and conclusions.
2. 4.16 Ensure the report is reviewed and approved by relevant stakeholders.
3. 4.17 Submit the report to regulatory bodies or internal stakeholders as required.
6. Review and Update:
1. 4.18 Regularly review the stress testing protocol and update it based on new data or regulatory changes.
2. 4.19 Archive the approved protocol and report in a controlled document management system.

5) Abbreviations, if any

• CQA: Critical Quality Attribute
• API: Active Pharmaceutical Ingredient
• HPLC: High-Performance Liquid Chromatography

6) Documents, if any

• API Stress Testing Protocol
• Stress Testing Log Sheets
• Stress Testing Report Template

7) Reference, if any

• ICH Q1A(R2): Stability Testing of New Drug Substances and Products
• ICH Q1B: Photostability Testing of New Drug Substances and Products
• FDA Guidance for Industry: Stress Testing of APIs

8) SOP Version

Version 1.0