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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.
However, when the medication being purchased and the person purchasing the medication isn't careful enough to check the expiration date on the container, the danger is only worsened. Although it may seem like a simple idea of what not to do, taking expired medication is actually a common practice.