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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.
I would not be at all worried about expired prescription drugs. We have done, and will continue to do so. Injectable vet antibiotics work well also. (Make sure it is only an antibiotic and not mixed with something else). The liquid, flavored children's antibiotics that are kept in the fridge do go bad fairly quickly.