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The better questions are:

When you are prescribed antibiotics should you finish the whole course and not have any left over ? - Answer: Yes.

If you think you have an infection that requires antibiotics should you go see the doctor or just fish around in the medicine cabinet for whatever old stuff is lying around? - Answer: No.

To answer the question you did ask: It likely has lost some potency which means that if you take it and it does not work, or if it turns out to be the wrong medication for other reasons, you may select for resistant bacteria and make future treatments more difficult.

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13y ago

What else can I help you with?