Antibiotics are important medicines used to treat infections caused by bacteria but they do not help viral infections such as colds and flu. Bacteria can adapt and find ways to survive the effects of an antibiotic and become antibiotic resistant, which means that antibiotics no longer work. The more often we use an antibiotic, the more likely it is that bacteria will become resistant to it.
We only use antibiotics when it is appropriate to do so because the infection is a bacterial one and not a viral one and your GP will only prescribe antibiotics when you need them, for example for a kidney infection or pneumonia. When an antibiotic is prescribed, the complete course should be taken in order to get rid of the bacteria completely because if the course if not completed, some bacteria may be left to develop resistance.