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Because antibiotics do not fight viruses such as flu or COVID-19. Antibiotics are used to prevent or treat bacterial infections. When used inappropriately, antibiotics may lose their long term effectiveness, causing future bacterial infections to be worse and last longer.
Antibiotics are used to prevent or treat bacterial infections only. They DO NOT work on viral infections such as flu or the common cold.
Check with your doctor to ensure you only take antibiotics for the right reasons and at the right time.