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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.
In mild cases, diarrhea may last up to 14 days after you stop taking the antibiotic. In more severe cases, the symptoms may not go away until several weeks after you start treatment. The symptoms may also come back after treatment.