By Dr. Mahnoor Jalil
Mercy
Antibiotics are one of the most important tools in modern medicine. They work by killing bacteria or stopping them from multiplying, giving your immune system the help it needs to fight infections.
These medications treat a wide range of bacterial illnesses, from common conditions like sinus infections and urinary tract infections to serious, life-threatening diseases such as sepsis and meningitis.
But here’s something many people don’t realize: antibiotics do not work against viruses. Colds, flu and most sore throats are caused by viruses, which have a completely different structure than bacteria. Antibiotics target features like bacterial cell walls and protein-making machinery, things viruses simply don’t have. So, taking antibiotics for a viral illness won’t help you feel better and can actually cause harm.
Why Misuse Is Dangerous
Using antibiotics when they’re not needed — or using them incorrectly — can lead to antibiotic resistance, one of the biggest health threats worldwide. When antibiotics are overused or stopped too soon, bacteria learn to survive and adapt. These resistant bacteria spread quickly, making infections harder to treat and increasing the risk of complications, longer hospital stays and higher health care costs. According to the World Health Organization, one in six bacterial infections globally is now resistant to standard antibiotics.
When Are Antibiotics Really Needed?
Doctors prescribe antibiotics only when a bacterial infection is confirmed or strongly suspected. Signs that point to a bacterial infection include:
- High, persistent fever
- Thick yellow or green discharge
- Severe, localized pain
- Symptoms that improve, then worsen again
- Lab results showing elevated white blood cells or markers like CRP
For mild or uncertain cases, your doctor may recommend watchful waiting or delayed prescribing instead of starting antibiotics right away.
Questions to Ask Before Starting Antibiotics
- Do I definitely have a bacterial infection?
- Could this clear up without antibiotics?
- Which antibiotic is being prescribed, and why?
- How long should I take it — and do I need to finish the full course?
- What side effects should I watch for?
- Could it interact with my other medications?
- Are there foods, alcohol, or supplements I should avoid?
- What happens if I miss a dose?
- When should I start feeling better, and when should I follow up?
The Risks of Taking Antibiotics When You Don’t Need Them
Taking antibiotics when they aren’t needed can lead to several problems. It promotes antibiotic resistance, making future infections harder to treat, while killing helpful bacteria in your body, which can upset your natural balance and cause issues like nausea or diarrhea. Unnecessary use increases the risk of serious infections such as Clostridioides difficile (a bacterium that can infect the colon, typically after antibiotic use) and can trigger allergic reactions or harmful drug interactions. Beyond these health risks, antibiotics offer no benefit for viral illnesses like colds or the flu and contribute to higher health care costs.
You can help fight antibiotic resistance by using these medications responsibly. Only take antibiotics when prescribed by a health care professional, and never request them for viral infections. Complete the full course as directed, and avoid sharing or saving leftover antibiotics. Follow dosing instructions carefully, practice good hand hygiene and keep your vaccinations up to date. Dispose of unused antibiotics properly and avoid unnecessary antibacterial products. Most importantly, trust your health care provider’s advice rather than self-medicating.
At Mercy, we’re committed to promoting responsible antibiotic use and educating our patients and communities. Together, through awareness and smart choices, we can protect these life-saving medicines and ensure they remain effective for generations to come.
