It may vary with which drug it is. Most drugs don't become inert on the 1st day past expatriation date. It also depends on if you have the expiration date on the bottle the pills came in, or the date the pharmacy put on their bottle. Usually the drug still works, it's just not as strong as it once was. But I seem to remember once reading not to take doxycycline past it's expiration date. Not sure why. But as I said, usually the drug is just weaker, but it still works.
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