Expiry and Retest Date

 Expiry and retest dates are important aspects of quality control and regulatory compliance for products that have a shelf life, such as pharmaceuticals, biologics, and other chemical or biological substances.

The expiry date is the date after which a product should not be used or sold, as it may no longer be safe or effective. The expiry date is typically determined through stability testing, which assesses the quality and stability of a product over time under various environmental conditions, such as temperature, humidity, and light exposure. Based on the results of stability testing, the expiry date is set to ensure that the product remains safe and effective for a defined period of time.

The retest date, also known as the expiration date, is the date by which a product should be retested to ensure that it still meets the required specifications for quality and safety. The retest date is typically shorter than the expiry date and is based on the product's stability data and the anticipated degradation rate of its key components.

The expiry and retest dates are typically determined during product development and are subject to regulatory review and approval. They are also required to be included on product labels and accompanying documentation to ensure that users are aware of the product's shelf life and storage requirements.

It is important to note that once a product has reached its expiry date, it should not be used or sold, as it may no longer be safe or effective. Products that have exceeded their expiry date should be properly disposed of to prevent potential harm to consumers or the environment.

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