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Since a law was
passed in 1979, drug manufacturers are required to stamp an expiration
date on their products. This is the date at which the manufacturer can
still guarantee the full potency and safety of the drug.
Most of what is known about drug expiration dates comes from a study
conducted by the Food and Drug Administration at the request of the
military. With a large and expensive stockpile of drugs, the military
faced tossing out and replacing its drugs every few years. What they
found from the study is 90% of more than 100 drugs, both prescription
and over-the-counter, were perfectly good to use even 15 years after the
expiration date.
Medical
authorities state if expired medicine is safe to take, even those that
expired years ago. A rare exception to this may be tetracycline, but the
report on this is controversial among researchers. It's true the
effectiveness of a drug may decrease over time, but much of the original
potency still remains even a decade after the expiration date.
Excluding nitroglycerin, insulin, and liquid antibiotics, most
medications are as long-lasting as the ones tested by the military.
Placing a medication in a cool place, such as a refrigerator, will help a
drug remain potent for many years.
Updated: August 13, 2017 Published: November, 2003- Harvard M School