One study of medications that had been stored for decades showed that most of them were still at 90% potency after all that time.
Another comprehensive study done by an independent group called The Medical Letter looked at the safety of expired medications and found that many medications are safe and still at around 90% potency for at least five years after their expiration date.
If your medication is moved to another container or mixed with something else, this may shorten the length of its potency and safety, which results in a beyond-use date that differs from the expiration date.
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This is true for over-the-counter medications as well.
The importance of the expiration date differs a bit depending on the type of medication it is, as well as how it has been stored.
They should never be stored in bathroom medicine cabinets or near heating elements or stoves. Richard Altschuler, in an article that has been endorsed and republished by Psychopharmacology Today and quoted by Harvard Medical School Family Health Guide, provides an excellent bit of advice:"Wisdom dictates that if your life does depend on an expired drug, and you must have 100% or so of its original strength, you should probably toss it and get a refill, in accordance with the cliché, 'better safe than sorry.' If your life does not depend on an expired drug, such as that for headaches, hay fever, or menstrual cramps, take it and see what happens." Most medications can be safely thrown away, but read the label or package instructions to see what the recommendations are for that particular medication.
However, this does not apply to liquids, which are not as stable.
The Medical Letter recommends that if a liquid medication looks cloudy or discolored, smells funny or looks like it has moisture inside, it's time to get rid of it.
This also does not apply to Epi-Pens, where the epinephrine begins to break down after the expiration date.
Proper storage in a cool, dry place also helps maximize the potency of medications.
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We've all wondered about using medications past their expiration dates. The reason for this is that both expiration dates and beyond-use dates take into consideration the handling and storage factors of the medication.
If a pharmacist puts your medication into another container, that date will be even shorter and is reflected in the beyond-use date.
Most medications have an expiration date between 12 to 60 months after they are manufactured.