Do Drugs Go Off ? What Happens To Medicines After Their Use-By Dates



By Michael Cole in The Conversation.


It is estimated that there is a staggering £300m worth of medicine unused in the UK every year. But is it safe to take these medicines if they are past their expiry date?

Expiry dates are put in place after rigorous trialling and controlled experiments to ensure the safety and effectiveness of the drugs people take. In short, they guarantee the potency of the drug. Medicinal drugs are all chemicals and the rate at which they go off will depend upon their chemical structure, the drug preparation, how they are packaged, environmental conditions, whether they are subject to microbial contamination and their exposure to heat, light, oxygen and water.


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