How Antibiotics Work
There are many different classes of antibiotics, and each one attacks bacteria in a different way. Penicillin and related antibiotics work by destroying the bacterial cell wall, causing the bacteria to burst open and die. Tetracyclines stop bacteria from making the proteins they need to survive and reproduce. Fluoroquinolones interfere with the bacteria’s ability to copy its own DNA, preventing it from multiplying. Doctors choose which antibiotic to prescribe based on the type of bacteria causing the infection.
Antibiotics Only Fight Bacteria
One of the most important things to understand about antibiotics is that they only work against bacterial infections. They have absolutely no effect on viruses, which cause illnesses like the common cold, the flu, COVID-19, and most sore throats. Taking antibiotics for a viral illness will not help you get better and can actually cause harm by killing helpful bacteria in your body. This is why your doctor may test you before prescribing antibiotics, to make sure your illness is actually caused by bacteria.
What Is Antibiotic Resistance?
Antibiotic resistance occurs when bacteria change, or evolve, so that antibiotics can no longer kill them. This happens because when antibiotics are used, most bacteria die, but a few that happen to have natural resistance survive. Those surviving bacteria then multiply rapidly, creating a new population of bacteria that the antibiotic cannot fight. This is a natural process of evolution, but the overuse and misuse of antibiotics has made it happen much faster than it would otherwise.
Why Resistance Is Dangerous
The World Health Organization considers antibiotic resistance one of the greatest threats to global health today. Bacteria that resist multiple antibiotics, sometimes called “superbugs,” are becoming more common and harder to treat. MRSA, which stands for methicillin-resistant Staphylococcus aureus, is one well-known superbug that causes infections resistant to many standard antibiotics. Antibiotic-resistant infections already cause hundreds of thousands of deaths worldwide each year, and experts warn that number could rise dramatically if action is not taken.
Why Finishing Your Antibiotics Matters
When a doctor prescribes antibiotics, they give you enough medicine to kill all the bacteria causing your infection. If you stop taking the antibiotics early because you feel better, some bacteria may still be alive in your body. The bacteria that survived are often the ones most resistant to the antibiotic, and they can multiply and cause a new, harder-to-treat infection. Completing the full course of antibiotics, even after symptoms disappear, is one of the most important things you can do to fight antibiotic resistance.
Using Antibiotics Responsibly
Responsible antibiotic use is something everyone can practice to help slow the spread of resistance. Only take antibiotics that have been prescribed specifically for you by a doctor, and never share them with friends or family members. Do not pressure your doctor to prescribe antibiotics when you have a viral illness like a cold or the flu. Washing your hands regularly, staying up to date on vaccines, and handling food safely all help prevent infections in the first place, reducing the need for antibiotics.
The Future of Fighting Bacteria
Scientists around the world are working on new ways to fight bacterial infections as antibiotic resistance grows. Researchers are developing new antibiotics, but the process is slow and expensive, and bacteria can develop resistance to new drugs too. Some scientists are exploring alternative approaches, such as using bacteriophages, which are viruses that specifically attack bacteria, or boosting the body’s own immune defenses. Everyone has a role to play in protecting the antibiotics we have now so they continue to save lives for future generations.
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