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Med Plug RX Editorial·7 min read·Med Plug RX Library

GMP Manufacturing 101

Good Manufacturing Practice is often described as a regulation. It is more usefully understood as an operating philosophy with a single premise: quality cannot be inspected into a product at the end. It has to be built into every step, and the evidence has to be written down as it happens.

The room is the first control

Cleanroom classification is defined by airborne particle concentration. ISO Class 5 — the standard for aseptic processing of sterile product — permits no more than 3,520 particles of 0.5 micrometres or larger per cubic metre. For scale, ordinary room air typically runs several million.

That figure is achieved through HEPA filtration, unidirectional airflow, controlled pressure differentials between adjacent zones, and disciplined gowning. Critically, classification is not a certificate hung on a wall. It is a continuously monitored state, with viable and non-viable particle counts trended over time and excursions investigated.

Qualification: IQ, OQ, PQ

Equipment enters service through three documented stages. Installation Qualification verifies it was installed to specification. Operational Qualification verifies it performs across its operating range. Performance Qualification verifies it performs reliably under real production conditions with actual material.

Only after all three is the equipment considered qualified — and any subsequent modification triggers formal change control and, where warranted, requalification.

The batch record is the product's biography

Every lot generates a batch record documenting materials and their lot numbers, equipment used, personnel involved, environmental conditions, in-process checks, deviations and their resolution, and analytical results. It is contemporaneous — written as the work occurs, not reconstructed afterward.

Aseptic operations are additionally validated by media fill: the entire process is run using sterile growth medium in place of product, then incubated. Any contamination reveals a process capable of contaminating real material.

Deviations, and who is allowed to say yes

A mature quality system is not one where nothing goes wrong. It is one where everything that goes wrong is captured, investigated to root cause, corrected and trended. A facility reporting zero deviations is a facility that is not looking.

The final structural control is independence. Release authority sits with Quality Assurance, not with production. QA reviews the complete record and either releases the lot or does not — and cannot be overruled by a manufacturing schedule. Where that independence is absent, every other control is negotiable.

Selected Literature
  1. FDA Guidance for Industry: Sterile Drug Products Produced by Aseptic Processing — Current Good Manufacturing Practice. 2004
  2. ISO 14644-1:2015 — Cleanrooms and associated controlled environments: Classification of air cleanliness by particle concentration
  3. 21 CFR Parts 210 and 211 — Current Good Manufacturing Practice for Finished Pharmaceuticals
This article is educational material for licensed physicians. It describes published science; it is not a claim that any preparation diagnoses, treats, cures or prevents any disease. Clinical application, indication and patient selection remain the sole responsibility of the treating physician.
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