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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.
When we place expiration dates on drugs, it's an estimate as to how long it will remain effective. We rarely perform extensive tests to determine if the drugs or packing materials will form dangerous chemicals over time. As a general rule, you should never take expired medicine.