Abby Garcia, Abby- Resident Noodle Expert
Take a look at this Drug Expiration Dates - Are They Still Safe to Take? article.
Here is some more information about expired drugs:
The expiration date is the final day that the manufacturer guarantees the full potency and safety of a medication.
The expiration date of a drug is estimated using stability testing under good manufacturing practices as determined by the Food and Drug Administration (FDA). Drug products marketed in the US typically have an expiration that extends from 12 to 60 months from the time of manufacturer.
Once the original container is opened, either by the patient or the health care provider who will dispense the drug, that original expiration date on the container can no longer be relied upon. However, the actual shelf life of the drug may be much longer, as stability studies have shown.