What is a product quality review and what should it tell you?

Why

US regulation requires records to be evaluated at least annually to decide whether specifications or manufacturing and control procedures need to change, including a representative number of batches and the complaints, recalls, returns and investigations for each product. This is usually called the annual product review. EU GMP Chapter 1 asks for a product quality review with a longer minimum list: starting materials and their supply chain, critical in-process and finished product results, failed batches, significant deviations and the effectiveness of their CAPA, changes, marketing authorisation variations, stability results, complaints and recalls, qualification status of equipment and utilities, and contractual arrangements.

The value of the review is in seeing a whole year at once. A single assay result of 98.1 percent looks fine, but twelve months drifting from 100.2 to 98.1 tells you something is changing. A deviation closed in March and a similar one in October may look unrelated until they sit side by side.

A useful review ends with conclusions and actions, such as tightening an alert limit, revalidating a step, or confirming the process is capable. It becomes paperwork when it compiles data without analysis, or when it is written so long after year end that the problems it reveals are already old.