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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.
Best Answer: It loses it potency. Which can cause the bacteria to not be killed completely, and they can become resistant to the antibiotics. Resistant bacteria can be very dangerous. They can cause super infections which are resistant to antibiotics and are Very difficult to kill. I work in a hospital and have seen people die from infections resistant to antibiotics because people did not use their antibiotics properly. if you are considering taking expired antibiotics, please do Not.