What Is a GMP Audit and How Do You Prepare for One?

A GMP audit is a systematic, independent examination of a manufacturing site against Good Manufacturing Practice requirements, to confirm that its facilities, processes, records and quality system meet regulatory standards. Audits may be internal (self-inspection), supplier audits, or regulatory inspections. Preparing for a GMP audit means making sure your evidence of control is complete, current and easy to demonstrate before the auditor arrives.

Types of GMP audit

There are three common types of GMP audit:

• Internal self-inspections that a site runs on itself.

• Supplier or third-party audits of vendors and contract manufacturers.

• Regulatory inspections by authorities such as the FDA, EMA or HPRA.

Each tests whether the quality system works in practice, not just on paper.

How to prepare for a GMP audit

Effective preparation starts well before the audit date:

1. Run a mock inspection to find gaps.

2. Confirm that documentation is complete and retrievable.

3. Make sure CAPAs are closed with evidence.

4. Brief staff on how to answer questions clearly.

5. Resolve known issues rather than hoping they go unnoticed.

The goal is to demonstrate control, not to survive scrutiny.

What auditors look for

Auditors focus on whether decisions are risk-based and documented, whether data is complete and trustworthy, and whether findings from the past were genuinely fixed. A recurring observation signals that a prior commitment was not kept, which weakens confidence in the whole system.

Frequently asked questions

What is the difference between a GMP audit and an inspection?

An audit is a broad term for any structured examination against GMP, including internal and supplier audits. An inspection usually refers specifically to a regulatory authority reviewing a site.

How often should GMP self-inspections happen?

Sites should run self-inspections on a defined schedule, typically at least annually for each area, with the frequency justified by risk.

How do you pass a GMP audit?

By demonstrating a quality system that works day to day: complete records, closed CAPAs, risk-based decisions, and staff who understand their processes.

About the author

Kieran Falvey is Founder and Managing Director of Pharmalliance Consulting Ltd and the creator of Contamination Control by Design (CCbD). He has more than 20 years designing, building and running pharmaceutical facilities worldwide, across FDA, EMA, TGA, PIC/S and Indian FDA (CDSCO) jurisdictions. Global expert in cGMP Compliance, Remediation and Contamination Control, helping Sterile, Non-Sterile, ATMP and Cosmetic companies navigate cGMP compliance issues.

About Pharmalliance Consulting

Pharmalliance Consulting is a GMP compliance consultancy serving pharmaceutical, sterile, non-sterile, OSD, ATMP and cosmetic manufacturers in Ireland, the UK, the EU and the US. It helps sites identify and remediate GMP risks across facilities, quality systems and contamination control, aligned with HPRA, MHRA, EMA and FDA expectations, turning findings into defensible, inspection-ready practice.

Preparing for an inspection or supplier audit? Explore our GMP Audit Ready and Regulatory Readiness services, or contact the team to arrange a mock inspection.