Essential Aspects of Conducting a Validation Audit in Pharmaceuticals

Validation audits serve a pivotal role in evaluating a pharmaceutical facility's adherence to validation protocols throughout the lifecycle of its operations. These audits ensure that validation processes are scientifically robust, adequately documented, and properly implemented to maintain control over equipment, processes, and systems.

Establish the Validation Master Plan

To begin an audit, focus on the Validation Master Plan (VMP), which articulates the organisation's overarching strategy for validation and qualification. Verify that the VMP encompasses:

• All relevant sites, systems, processes, cleaning methods, and analytical procedures.
• Defined responsibilities for execution and a clear strategy for validation activities.
• A documented risk management model that outlines the scope of validation.
• Current validation activities and future plans.
• Procedures to support maintaining validated status.
• Mechanisms for periodic revision of the VMP.

Cross-reference the planned activities in the VMP with actions taken at the facility. For example, if a new production line has been added, ensure it is included in the VMP and that appropriate qualification steps have been documented.

Assess Risk Evaluation and Validation Strategy

Documenting risk evaluation is vital to establish what needs validation and the extent of this validation. Auditors should verify how the site gathers information about critical machines, process parameters, and quality attributes. Ensure that risk assessments are based on a thorough understanding of the product and production processes, rather than generic templates. For instance, in cleaning validation, the selection of the worst-case product should be grounded in insights into cleaning efficiencies, solubility, and toxicity. It's crucial to check if risk assessments have been updated in response to significant changes, such as new product introductions or alterations in processes. Additionally, confirm that the validation methodology is scientifically justified, including the number of batches for process validation and the established sampling frequencies.

Evaluate Equipment and Utility Qualification Documentation

Qualification of equipment and utilities is essential for compliant production. Examine the documentation for Design Qualification (DQ), Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ) to ensure each stage has been appropriately planned, relevant to the specific equipment's design and purpose. Verify the following:

• User requirements and technical specifications have been approved.
• Equipment identification and installation records are complete.
• Verification of critical equipment has been documented.
• Calibration of measuring instruments has been performed and recorded.
• Testing of alarms and operational parameters has been verified against acceptance criteria.
• Deviations and changes have been adequately documented.

For water systems, scrutinise validation points, monitoring documents, and sanitization practices. For HVAC systems, review validation documents covering airflow rates, temperature, humidity, and compliance with design specifications.

Review Process and Cleaning Validation Status

The process validation audit should confirm that the manufacturing process can consistently produce products that meet predetermined quality standards. Focus on the entire lifecycle of the process, not just the final validation report. Key areas to review include:

• Understanding of the process design supporting commercial viability.
• Identification of critical process parameters and quality attributes.
• Existing qualification protocols and standards.
• Documentation of validation batches and in-process results.
• Impacts of any process deviations on validation outcomes.
• Ongoing verification of processes.

For cleaning validation, check the justification of the worst-case scenario, residue limits, sampling techniques, and the efficacy of analytical techniques used. Ensure that sampling locations and analysis results align with laboratory records.

Inspect Analytical Methods and Computer System Validation

Analytical methods must produce reliable data for testing, in-process controls, and batch releases, necessitating a thorough examination of their validation status. Confirm that these methods have been validated for their intended use, focusing on properties like specificity, accuracy, precision, linearity, and robustness. Review documented calculations, chromatograms, system suitability tests, and any unexpected results.

Validation of computerized systems differs from that of analytical instruments, requiring an evaluation of system usage, user needs, risk assessments, and access controls. Ensure backup arrangements and data integrity are in place.

Investigate Nonconformities, Change Control, and CAPA Strategies

Validation operations often encounter unexpected issues. Audit findings should investigate whether these issues were identified and their impact on validation outcomes has been properly assessed. Select specific instances of validation deviations, ensuring thorough analysis is documented. For example, in laboratory chromatography systems, examine user privileges and data protection measures. Additionally, assess change control processes, verifying that changes have undergone impact evaluations and any necessary additional analysis or revalidation has been performed.

Confirm Documentation and Sustaining Validated Status

Validation is an ongoing process that requires continuous monitoring and periodic assessments. Validate that documentation is accurate, retrievable, and complete. Ensure that executed documents are signed and traceable back to the relevant systems, adhering to ALCOA+ principles. Understand the triggers for revalidation, such as significant equipment changes or frequently occurring nonconformances.

Utilising an Effective Validation Audit Checklist

This checklist is designed to initiate an internal audit aligned with Good Manufacturing Practice. Tailor the scope of the audit to the specific facility, products, and regulatory requirements.

Reporting Findings from the Audit

Audit outcomes must accurately reflect the specified standards or procedures, the current situation, and supporting evidence. Avoid vague language; specify exact documentation or procedural deficiencies. Classify findings in accordance with the site’s auditing protocol, evaluating their implications for product quality, patient safety, and compliance. Assign responsible parties and create realistic timelines for corrective actions aimed at preventing recurrence of the identified issues. An effective validation audit provides a thorough assessment of the processes and practices in place, ensuring robust evidence of operational control.