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Translation: Taking expired doxycycline can harm your kidneys. While it is true that some drugs merely lose strength after their expiration date, many drugs (especially antibiotics!!) break down into harmful chemical products, similar to the way juice or wine can ferment if left too long. Bottom line--don't take them.
If your life does not depend on an expired drug -- such as headache, common cold, or constipation -- you may take the medication and see what happens. Medical authorities uniformly say it is safe to take drugs past their expiration date -- no matter how expired the drugs presumably are.