Preparation of medicine does not only consist of a formula. The quality should be the same when produced by the same process. Any slight alteration in the temperature, mixing time, equipment, or ingredients can influence the end product. It is here that process validation in pharma plays a role.
Process validation is used to enable pharmaceutical companies to verify that their manufacturing process is running as intended. It helps preserve product quality, patient safety, and Good Manufacturing Practices (GMP) as well.
What Is Process Validation in Pharma?
Process validation is a formal and documented method confirming the ability of a manufacturing procedure to always manufacture medicines of a specific quality.
FDA defines process validation as the collection and assessment of process design up to commercial production. This information provides evidence that the manufacturing process is capable of consistently producing a product that meets predetermined quality requirements.
Process validation gives a demonstration that the manufacturing process is capable of doing this again and again.
Why Is Process Validation Important in Pharma?
Medicines directly affect people’s health. Manufacturers cannot depend solely on testing of the final product. They should also be in good control of the production of the medicine.
A good validation process may assist:
- Ensure that the product is of constant quality.
- Minimize manufacturing mistakes and batch failures.
- Detect process changes or variations.
- Improve patient safety
- Minimize wastage and rework.
- Promote regulatory compliance and support GMP.
- Simplify manufacturing processes.
Three Stages of Process Validation
The lifecycle approach of the FDA breaks down pharmaceutical process validation into three key steps.
Stage 1: Process Design
This is where development and definition of the manufacturing process occurs.
Data gathered in product development and scale-up is utilised in determining how the commercial process is to operate. Among the factors that teams research are raw materials, equipment, temperature, mixing speed, processing time and other elements that could influence the quality of the product.
The objective is quite simple: learn more about the process before regular manufacturing starts.
Stage 2: Process Qualification
The next step is to check whether the designed process can work reliably under actual manufacturing conditions.
Facilities, utilities and equipment must be qualified. Qualification can consist of Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ).
Another aspect of this stage is Process Performance Qualification (PPQ). In the course of PPQ, the production cycle is oriented to given circumstances and the outcomes are thoroughly examined.
The results are documented in the company, and whether the process is as per the set
acceptance criteria.
Stage 3: Additional Process Checking.
Validation is not complete with commercial production.
The companies still utilise data on processes collected and assessed during routine production. This is referred to as Continued Process Verification (CPV).
Process parameters, product quality results, and deviations, as well as batch records, complaints and other useful information can be monitored by teams. The goal is to find an abnormal change before it can grow to more significant issues, quality-wise.
Common Types of Process Validation
Prospective validation is conducted prior to the regular commercial manufacturing. It is an assurance that the intended process is able to work as intended.
Concurrent validation is conducted during manufacturing of real batches of products. It can be applied for some reasonable reasons when validation information has to be gathered throughout production.
Retrospective validation uses past manufacturing records to study the performance of an established process. Modern regulatory approaches, however, place greater focus on lifecycle-based validation and continued monitoring.
The revalidation might be required when a significant alteration might be impacting the process or product. To illustrate, any alterations in equipment, raw materials, batch size, location, place of manufacture, or process conditions might need to be assessed.
A Simple Example of Process Validation
Take an example of a tablet manufacturing process.
The company initially determines the appropriate mixing time, compression parameters and other most important parameters. Next, it qualifies the equipment and carries out planned production runs. Tests are performed to ensure that samples weigh, are strong, dissolve and meet other quality specifications.
Significant data is still analysed once regular production begins. If results begin moving outside the expected range, the team can investigate the issue early.
This illustrates why process validation is not just simply filling documents. It is a continuous mechanism to put manufacturing in check.
Final Thoughts
Process validation in pharma helps manufacturers understand, control, and improve the way medicines are made. It begins during the design stage of the process and goes on during commercial production.
The practical validation programme emphasises good process knowledge, appropriate qualification, clear records, useful data and frequent monitoring. With such steps, manufacturers are able to minimise the unwanted variation and manufacture medicines with steady quality.