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Antibiotics are the medicines which kill or stop the growth of the disease causing microorganisms. The antibiotics are manufactured by growing specific microorganisms and are used to cure a variety of diseases.
It is important to remember that antibiotics should be taken only on the advice of a qualified doctor. Also you must finish the course prescribed by the doctor. If you take antibiotics when not needed, you help bacteria in your body to develop resistance to them. Next time when you fall ill and need these antibiotics, they would be less effective. Antibiotics, however, are not effective against cold and flu as they are caused by viruses.