Why Should You Always Finish Your Antibiotics?
Author: Onyinyechi Kalu
Editorial review: Adebowale Bello.
Have you ever woken up feeling ill, probably with a nasty fever? Your doctor prescribes a 10-day course of antibiotics, and by day three, you feel like a brand-new person already. You’re energetic, the fever seems to be gone, and you think, “Why should I keep taking these pills? They’re very effective, so I’ll save the rest for the next time I get sick and save some money.”
While this might seem like a logical move, it actually contributes to a massive global health threat: Antibiotic Resistance. This is a major reason why common illnesses are becoming much harder to treat nowadays.
By understanding what this is and how antibiotics work, we can all play a part in keeping antibiotics effective for ourselves and our families.
WHAT IS ANTIBIOTIC RESISTANCE?
Antibiotic resistance happens when bacteria change over time so that antibiotics can no longer kill them effectively. It does not mean your body is becoming resistant to the medicine; rather, the bacteria have changed their genetic makeup so that antibiotics no longer work against them.
Antibiotics have two main ways of killing bacteria: they can attack and destroy the cell wall(outer shell) or stop them from making proteins and reproducing, so the bacteria can no longer grow.
Imagine a farmer sprays a field with pesticide. It kills a lot of the bugs, but a few survive because they develop resistance to the pesticides. Those survivors then reproduce and pass that ability down to their offspring. As a result, the whole bug population becomes resistant to that pesticide. This is a basic survival instinct for all living things, and it’s the same thing that happens with bacteria and antibiotics.
So why should you care about antibiotic resistance?
According to the World Health Organization Global Surveillance Report (WHO GLASS) 2025, 1 in 6 bacterial infections worldwide is resistant to standard antibiotic treatments, with evidence of rapidly increasing resistance, further driving the use of reserve antibiotics.
A landmark study published in The Lancet found that in 2022, 4.95 million people died as a result of bacterial antibiotic resistance, and about 1.27 million people in 2019. It also showed compelling evidence that antibiotic resistance increases mortality, prolongs hospital stay, and negatively impacts the economy.
Without change, the future looks even more challenging. New forecasts from another study published in The Lancet show that by 2050, annual deaths directly attributable to antimicrobial resistance are projected to reach 1.91 million, with trends of increasing mortality in the elderly. The GRAM project study also projects 39 million deaths due to antimicrobial resistance between now and 2050; this equates to 3 deaths per minute.
HOW YOUR ACTIONS CONTRIBUTE TO ANTIBIOTIC RESISTANCE
It might feel like one person’s choices don’t matter, but millions of small decisions like this contribute to this problem. Here are common ways we contribute to antibiotic misuse:
Not Completing the Full Course of Antibiotics
Why do people do it?
- They feel better after the first few days.
- To avoid taking more pills.
Think of the fight against bacterial infections in waves. In the first few days, the first wave would have gotten rid of the most susceptible bacteria, but if you stop after the first few days, you allow the bacteria to adapt and develop resistance to these antibiotics. Not only will you get sick again, but these new, fortified bacteria could spread to others.
Taking Antibiotics for Viral Infections
Why do people do it?
- They don’t understand the difference between bacterial and viral infections.
- They believe antibiotics work for all illnesses.
- They want quick relief from symptoms.
Antibiotics have no effect on viruses (these cause the flu, common colds, and most sore throats). When you take them for viral infections, it’s like using the wrong key for a lock. It won’t cure the infection; instead, it gives the bacteria naturally present in your body a chance to develop resistance. You would be getting the side effects and no benefits.
Using Leftover or Sharing Antibiotics
Why do people do it?
- To save money and for convenience.
- They feel their symptoms are similar to someone else’s or the same as last time.
Antibiotics were developed after years of research to cater to specific types of bacterial infections. So while the symptoms may be similar to last time or even someone else’s, it’s not necessarily the same bacteria causing it. Think of taking the wrong antibiotic like using the wrong map; you won’t get to where you’re going, and you give the bacteria time to learn how to resist the drug.
Pressuring Your Doctor For Antibiotics
Why do people do it?
- They expect antibiotics for any illness.
- They want something to make them feel better faster.
- They paid for the appointment and feel the treatment is not optimal.
Doctors spend years learning which prescription fits a situation, and when you pressure them to prescribe antibiotics when it’s not needed or even go contrary to what is prescribed, it’s contributing to the global health threat.
Not Following Dosing Instructions
Why do people do it?
- They take double doses to get better faster.
- They skip doses and try to catch up.
- They take them at the wrong times.
Dosing ensures that there is a steady amount of the drug in your blood at all times, and incorrect dosing leads to resistance. When you take too little of the drug, bacteria are exposed but not fully killed. With inconsistent antibiotic levels in your body, bacteria get recovery time between doses.
WHY DOES COMPLETING YOUR ANTIBIOTICS MATTER?
A 10 or 14-day treatment plan isn’t just a random number picked by your doctor; it’s backed by years of research, clinical trials, and dosage specifications.
Here is an idea of what that timeline may look like:
- In the first few days, the medicine quickly clears out the most susceptible bacteria, the ones that have no natural defense against the drug. Your symptoms resolve, and you feel energetic.
- By the middle of the 10 or 14-day course, the drugs continue killing the bacteria, and you may feel completely fine.
- The final few days are for the bacteria that may have developed resistance. It’s important to keep the medicine at a steady level in your blood.
Finishing the course ensures there are no survivors and prevents the infection from recurring.
According to an article in the National Institute of Health, leaving even a small population of persistent bacteria alive gives them the chance to mutate and become the foundation for a future drug-resistant infection. If you stop after the first few days, you have essentially exposed the survivors to the drug, allowing them to develop a permanent shield for it.
As noted by the Centers for Disease Control and Prevention(CDC), this reduces the effectiveness of many medical procedures dependent on the ability to fight infections using antibiotics, including joint replacement, organ transplants, cancer therapy, and treatment of chronic diseases.
WHEN ANTIBIOTICS ARE NEEDED VS. WHEN THEY ARE NOT
Antibiotics are powerful, but they were developed for the purpose of killing bacteria. They are needed for illnesses caused by living bacteria, such as;
- Strep Throat
- Urinary Tract Infections (UTIs)
- Whooping Cough
- Severe bacterial skin Infections
On the other hand, antibiotics do not affect viral, parasitic, or fungal infections because bacteria do not cause them. Here’s how to know the difference;
It is impossible to tell just by your symptoms because a viral infection can make you feel just as miserable as a bacterial infection, and the only way to know for sure is through a professional diagnosis.
Doctors examine and use specific investigations to determine the cause of an infection. If your doctor says it’s a virus, trust them. Taking an antibiotic just in case doesn’t help you get better faster; it only helps the bacteria in your body learn how to resist the medicine.
HOW CAN YOU USE ANTIBIOTICS RESPONSIBLY?
Being a responsible patient doesn’t just protect you; it protects your family and the entire community. Here is your checklist for the next time you feel under the weather;
Do this the next time your doctor prescribes antibiotics:
- Follow the clock: Try to take your medicine at the same time as it is prescribed. It ensures there’s a steady level of the drug at all times.
- Finish the course: Even if you feel 100% better on Day 4 of a 7-day course, keep going until you complete it.
- Ask questions like: “Should I take the medicine with food?” “Will it interact with any other drug I’m also taking?” “If I don’t need antibiotics, what can I take to stop the pain or the cough while my body fights the virus?”
Don’t;
- Save them for later: If you have leftover pills (which shouldn’t happen if you finish your course), never self-medicate a new illness with them.
- Share your prescription: Even if the person has the same symptoms, sharing is not caring in this case; it’s dangerous.
- Skip doses: If you forget a dose, don’t double up the next time. Just get back on track as soon as you remember.
What If I Experience Side Effects?
Like other drugs, there’s always the risk of side effects and possible allergies with antibiotics.
Common side effects may include nausea, diarrhea, and stomach upset. If you notice these, let your doctor know rather than just stopping the meds. They can often suggest simple fixes, like taking the pills with specific food or adding something else to prevent these side effects. Usually, you can keep fighting the infection while managing these symptoms.
Signs of allergic reactions include rash, swelling, and difficulty breathing. This is the exception to the rule, and if you experience these, it is best to stop taking the drugs immediately and seek emergency medical care.
What Should I Do If I Think I Need Antibiotics?
If you feel ill and think you might need antibiotics, see a doctor rather than seeking a quick fix. Let them make a proper diagnosis and provide a proper management plan.
Do not:
- Pressure your doctor: Trust their expertise and follow through with the treatment plan.
- Buy them online or over the counter: In some places, you can find antibiotics without a prescription, but without a doctor’s guidance, you are likely taking the wrong medication.
CONCLUSION
It’s easy to think, “It’s just one pill,” but antibiotic resistance is a collective problem. While one person’s misuse may seem small, millions of these choices contribute to a global crisis.
Here’s what’s at stake globally:
- Without change, resistant infections could kill 1.9 million people annually.
- Medical procedures requiring antibiotic cover, like C-sections, dental work, and organ transplants, could become life-threatening.
- The elderly and those with weak immune systems have a higher mortality risk.
Antibiotic resistance is a serious threat, but it is not hopeless. It starts with a proper diagnosis; never self-medicate. Remember that every time you complete a full antibiotic course, you’re preserving medicine for future generations.
Disclaimer: This content is for informational purposes only and is not medical advice. Consult a qualified healthcare professional for diagnosis and treatment.
References
World Health Organization. Global Antimicrobial Resistance and Use Surveillance System (GLASS) Report: 2025 Edition. World Health Organization; 2025. https://www.who.int/publications/i/item/9789240116337
AMR Insights. Global antibiotic resistance surveillance report 2025. Published January 10, 2025. Accessed May 6, 2026. https://www.amr-insights.eu/global-antibiotic-resistance-surveillance-report-2025/
GBD 2021 Antimicrobial Resistance Collaborators. Global burden of bacterial antimicrobial resistance 1990–2021: a systematic analysis with forecasts to 2050. Lancet. 2024;404(10459):1199-1226. doi:10.1016/S0140-6736(24)01867-1
The Lancet. Global burden of antimicrobial resistance: time for a new chapter. Lancet. 2024;404(10459):1163. doi:10.1016/S0140-6736(24)01885-3
Wellcome Trust. New forecasts reveal 39 million deaths will be directly attributable to bacterial antimicrobial resistance by 2050. Wellcome. Published September 16, 2024. Accessed May 6, 2026. https://wellcome.org/insights/articles/new-forecasts-reveal-39-million-deaths-will-be-directly-attributable-bacterial-antimicrobial
Antimicrobial Resistance Collaborative. Antibiotic resistance has claimed at least one million lives each year since 1990: GRAM. University of Oxford. Published 2024. Accessed May 6, 2026. https://www.tropicalmedicine.ox.ac.uk/gram/news/antibiotic-resistance-has-claimed-at-least-one-million-lives-each-year-since-1990-gram
Laxminarayan R, Duse A, Wattal C, et al. Antibiotic resistance—the need for global solutions. Lancet Infect Dis. 2013;13(12):1057-1098. doi:10.1016/S1473-3099(13)70318-9
Centers for Disease Control and Prevention. About antimicrobial resistance. CDC. Updated 2024. Accessed May 6, 2026. https://www.cdc.gov/antimicrobial-resistance/about/index.html
