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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.
All antibiotics kill bacteria in your body--even the 'good' bacteria. This change of bacterial 'flora' upsets the G.I. Tract causing diarrhea, cramps etc.. --so it best to not take antibiotics unless necessary and when taking them to finish the course to prevent resistence.