Why won’t antibiotics help a cold or the flu?

Antibiotics kill or stop the growth of bacterial, but they have no effect on viruses such as colds or the flu. Antibiotics should only be used against bacterially caused illnesses like strep throat, bacterial pneumonia, and bacterial skin infections. There are many other reasons to avoid taking antibiotics unless it is necessary:

Side effects.
Your body contains both harmful and helpful bacteria. The helpful bacteria keep harmful organisms under control. Unfortunately, antibiotics don’t know the difference between harmful and helpful bacteria; they kill them all, permitting other illnesses or side effects to occur. Yeast infections and diarrhea are two of the possible side effects of taking antibiotics.

Drug-resistant bacteria
Bacterial become resistant to antibiotics after they have been exposed to them often enough. When you take an antibiotic, the organisms it affects struggle to survive. After repeated courses of antibiotic therapy, these organisms may successfully change their structure so that the antibiotic may no longer be effective.

Allergic reactions
Antibiotics sometimes cause allergic or toxic reactions that may be uncomfortable or even dangerous. People with allergies to antibiotics may develop rashes, hives, and in rare instances, may even die.