Pharma Stability: Insights, Guidelines, and Expertise
Before initiating any retest, it is important to establish whether it is justified. Retesting should not be used simply because an initial result is unfavorable. The following criteria must be met:
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Regulators expect a documented and approved SOP that outlines the complete OOS handling workflow. Your SOP should clearly differentiate between:
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Global regulatory bodies such as the CDSCO, USFDA, and EMA scrutinize how OOS results are interpreted and acted upon. Improper classification of a lab error as a valid OOS — or vice versa — can result in:
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Regulatory agencies like USFDA, EMA, and CDSCO expect that all employees involved in testing and documenting stability data understand:
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A generic drug manufacturer submitted a 12-month stability study on coated tablets stored under 25°C/60% RH conditions. During testing, the assay value for batch #B091 fell below the acceptance limit of 95.0% — triggering an OOS result (reported value: 93.1%). The analyst followed standard procedures and documented the OOS event.
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Stability studies require tightly controlled environmental conditions such as 25°C/60% RH or 40°C/75% RH. A deviation — even for a few hours — can compromise the integrity of test results. Excursions may arise from:
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Extending the stability study is not always the default response. The decision depends on:
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Structured SOPs provide:
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Though the underlying principles are similar, the specific terminologies and scopes slightly differ:
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Shelf life, or the expiry date, is determined based on long-term and accelerated stability data generated per ICH Q1A(R2) guidelines. Typically, shelf life is assigned using:
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