What Is the Shelf Life of Aspirin?

By Staff WriterLast Updated Mar 31, 2020 7:15:52 AM ET
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Manufacturers generally mark expiration dates on aspirin bottles for two or three years after packaging, but studies have shown that aspirin retains 100 percent potency after four years or even longer. Storing aspirin in cool, dark locations such as a closet shelf keeps the aspirin potent longer.