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WASHINGTON, Aug. 23, 2018 � We’ve all seen the expiration dates on prescription and over-the-counter medications. What’s less obvious to us as consumers is how these dates are determined and to what extent medicines actually go bad. In this video, Reactions explains where drug expiration dates come from: .

Reactions is a video series produced by the American Chemical Öйú365betÖÐÎĹÙÍø and PBS Digital Studios. Subscribe to Reactions at and follow us on Twitter . For more research news, journalists and public information officers are encouraged to apply for for the American Chemical Öйú365betÖÐÎĹÙÍø’s 256th National Meeting & Exposition, Aug. 19-23 in Boston.

The American Chemical Öйú365betÖÐÎĹÙÍø, the world’s largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.