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Expiration dating of prepackaged medications

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A drug that has passed its shelf life might still be safe for consumption, but its quality is no longer guaranteed.Shelf life is variably influenced by storage conditions, such as exposure to heat, light and moisture.Shelf life depends on the degradation mechanism of the specific product.Most can be influenced by several factors: exposure to light, heat, moisture, transmission of gases, mechanical stresses, and contamination by things such as micro-organisms.The expiration date of a medication indicates the date the manufacturer or pharmacist guarantees the full potency and safety of a drug.Some medications might retain potency and might be safe briefly following the expiration date, but you must check with a pharmacist about specific medications.In some regions, an advisory best before, mandatory use by or freshness date is required on packaged perishable foods.

This is important, as consumers enjoy fresher goods, and furthermore some stores can be fined for selling out of date products; most if not all would have to mark such products down as wasted, resulting in a financial loss.The term "shelf life" of a drug slightly differs from a drug's "expiration date".The shelf life generally relates to a drug's quality over a specified period of time, whereas the expiration date relates to both quality and safety of a medication at a specific point in time.Are there certain drugs that should never be used past their expiration date?For many patients, these questions arise because medications can be expensive, and it is costly to frequently replace expired but unused medications.These functions are beyond the regular practice of a pharmacist.