Why Your Doctor Says No to Antibiotics for a Cold
You have a stuffy nose, a scratchy throat, and a cough. It would be nice if a pill could fix it quickly. Many people think antibiotics are that pill, but when the doctor says no, there is a good reason.
Germs come in different kinds. Two common kinds are bacteria and viruses. Bacteria are tiny living things made of a single cell, and many of them are harmless or even helpful. Some, however, can make people sick, as in strep throat. Viruses are even smaller, and they cannot multiply on their own. They invade the body's cells and use them to make more viruses. Colds and the flu are caused by viruses.
Antibiotics are medicines made to stop or destroy bacteria. They work by attacking things that bacteria have and our own cells do not. Viruses do not have those parts, so an antibiotic does nothing to a cold. Swallowing one would give you the side effects of the medicine without any of the benefits.
There is another reason to be careful. Whenever antibiotics are used, a few bacteria may survive and pass their toughness to the next generation. Over time, that can create bacteria that the medicine can no longer stop. This is called antibiotic resistance, and it is one reason doctors want antibiotics saved for the times they are truly needed.
With a cold, the best help is rest, plenty of fluids, and time while the body's defenses do their work. When a doctor does prescribe an antibiotic, it should be taken exactly as directed.