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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.
replied March 30th, 2016. Most side effects of antibiotics do not last more than a few days (max 7 -10 days). If your issue is persistent for much longer duration, even after stopping the medications, then it is more likely that your symptoms are independent of the antibiotics. Consult your doctor and seek a second opinion.