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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.
1 Antibiotics generally work rapidly. Be sure to ask your doctor when to expect results and find out what you should do if you experience no improvement after a couple of days.  Antibiotics can cause a number of side effects. Nausea, diarrhea, and allergic reactions are some known side effects of antibiotics.