I'm not all that sure that expiration dates mean much.
agreed ... thanks for reminding me
I've posted this before, but it doesn't take long to go to Google and ask:
efficacy of drugs after expiration date
from the first (
link)
Excluding certain medicines such as nitroglycerin, insulin, epinephrine, and tetracycline, most medicines stored under reasonable conditions retain at least 70–80% of their original potency for at least 1–2 years after the expiration date, even after the container has been opened
there's more if you want; from:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040264/
The expiration date is the final day that the manufacturer guarantees the full potency and safety of a medication. Drug expiration dates exist on most medication labels, including prescription, over-the-counter (OTC) and dietary (herbal) supplements.
Proper storage of medications may help to extend their potency. The bathroom and medicine cabinet are not ideal places to store medications due to heat and humidity. Similarly, medications should not be left in a hot car. Medications remain most stable in dry, cool spaces away from light. Keep the prescription bottle caps tightly closed and always keep medications out of reach of children and pets.
According to the Food and Drug Administration (FDA) study gets to the heart of medicine expiration and safety. Updated: August 13, 2017, it turns out that the expiration date on a drug does stand for something, but probably not what you think it does. 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.
Medical authorities state that expired medicine is safe to take, even those that expired years ago. 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.