Industrial Pharmacy · Short notes

Process Validation: Short Notes & Cheat Sheet

Definition and lifecycle stages of process validation, types of validation, equipment qualification, QbD and risk tools, and cleaning validation.

Short notes

Read these before you attempt the topic's MCQs.

Equipment must be qualified before the process running on it can be validated.

Process validation is documented evidence that a process consistently produces a product meeting its predetermined specifications and quality attributes.
The FDA's lifecycle approach has three stages: process design, process qualification and continued process verification.
Process qualification includes qualifying the facility and equipment and running process performance qualification (PPQ) batches, traditionally at least three consecutive batches.
Continued process verification uses routine data (often statistical process control) to show the process stays in control.

Prospective: completed before the product is sold; the normal approach.
Concurrent: carried out during routine production, only in justified exceptional cases.
Retrospective: based on historical batch data; no longer encouraged.
Revalidation: after significant changes (equipment, process, site, supplier) or periodically.
Equipment qualification: design (DQ), installation (IQ), operational (OQ) and performance (PQ).

Quality by Design (ICH Q8) links critical quality attributes (CQAs) to critical process parameters (CPPs) and defines a design space.
Quality risk management (ICH Q9) uses tools such as FMEA, HACCP and fishbone diagrams.
Cleaning validation proves equipment is cleaned to acceptable limits, usually the strictest of 10 ppm carry-over, 1/1000 of the smallest therapeutic dose, or visually clean.
Cleaning samples are taken by swabbing surfaces or rinsing equipment, targeting the worst-case (hardest to clean, most potent) product.
Aseptic processes are validated by media fills: sterile growth medium is processed exactly like product and checked for contamination.
Process capability index (Cpk) of 1.33 or more is generally considered capable.

High-yield facts in one place. Cover the right-hand column and test yourself.

Stage	Confirms
DQ — design	Design meets user requirements
IQ — installation	Installed correctly, as specified
OQ — operational	Works across its operating ranges
PQ — performance	Performs consistently in real use

Type	When
Prospective	Before commercial release (standard)
Concurrent	During production (exceptional)
Retrospective	From historical data (discouraged)
Revalidation	After change or periodically
Cleaning validation	Carry-over limits: 10 ppm, 1/1000 dose, visually clean

D-I-O-P: Design, Installation, Operational, Performance qualification, always in that order.

IQ checks installation; OQ checks the equipment works over its ranges; PQ checks consistent real-use performance.
Retrospective validation is no longer an acceptable routine approach.
Validation is documented evidence, not just successful batches.
Media fills validate the aseptic process, not the sterilisation of the product.

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