What Is Antibiotic Resistance? Why Is It a Global Threat?

Antibiotic resistance is the ability of bacteria to resist and survive medications designed to destroy them or stop them from multiplying. This situation causes even simple infections that were previously easily treatable to linger, prolonging the illness and spreading rapidly within the community. Fighting resistant bacteria has become one of the greatest challenges modern medicine faces and a major threat to public health worldwide.

• Antibiotics do not affect viruses; they are only used to treat bacterial infections.
• It is not the human body that develops resistance, but the disease-causing bacteria itself.
• Unnecessary antibiotic use is the biggest factor accelerating the development of resistance.
• Stopping treatment halfway allows surviving bacteria to grow even stronger.
• Treating resistant infections is longer, more difficult, and more costly.
• Medications should never be used without a doctor's prescription or based on advice from friends and family.

What Is Antibiotic Resistance and How Does It Develop?

Antibiotics are powerful medical agents that treat infections by breaking down the bacterial cell wall or disrupting protein synthesis. However, bacteria constantly change their genetic structure to survive. When a medication is used during an infection, weak bacteria sensitive to the drug die, while bacteria that have become resistant through a genetic mutation manage to survive. These surviving resistant bacteria continue to multiply and can pass their resistance genes to other bacteria around them.

A common misconception in society is that the human body becomes resistant to the drug. In reality, it is the bacteria itself that gains resistance, not the person. Because of this, even someone who has never taken antibiotics in their life can experience a very difficult infection due to a resistant bacterium caught from someone else. Over time, none of the medications we currently have will work on these "superbugs."

Although the development of resistance is fundamentally a natural evolutionary process, human errors have driven this process to a dangerous speed. Medications used not only in human health but also as growth factors or preventatives in the agriculture and livestock sectors mix into nature, accelerating the spread of resistant genes through water and soil.

Unnecessary Antibiotic Use and Risk Factors

At the core of the resistance problem lies the unnecessary use of antibiotics. When experiencing complaints like a sore throat, runny nose, mild fever, or cough, many people tend to quickly reach for an antibiotic in hopes of a fast recovery. However, the vast majority of these symptoms are caused by viruses, not bacteria. These medications have no healing effect on viral illnesses such as the common cold, flu, or Covid-19. To properly distinguish between these symptoms, you can review our article titled How to Distinguish Between Flu, Common Cold, and Covid-19 Symptoms?.

Another major mistake is randomly consuming half-empty boxes of medication left over at home. Treatments started without a doctor's examination only weaken the bacteria instead of killing them completely, paving the way for them to build immunity against the drug. Additionally, taking less than the prescribed dose or not adhering to the schedule lowers the active ingredient level in the blood, giving bacteria an opportunity to recover.

Respiratory tract infections spread rapidly, especially during the winter months as we spend more time indoors—from crowded ferries crossing the Bosphorus to bustling shopping malls in Istanbul. Supporting immunity and protecting against illnesses during this period is the most effective way to prevent unnecessary medication use. For more information on ways to protect yourself from illnesses, you can check out our Guide to Protection Against Increasing Viral Infections as Winter Approaches.

Dangers of Antibiotics and Their Effects on the Body

While antibiotics are life-saving, they are also medications that can cause serious harm to the body when not used correctly. The human gut is home to trillions of beneficial bacteria that aid digestion, support the immune system, and synthesize vitamins. Broad-spectrum drugs indiscriminately kill these beneficial "friendly" bacteria while destroying the bad bacteria causing the illness.

The disruption of beneficial flora is the most common among antibiotic side effects. When this balance is disturbed, digestive system issues such as diarrhea, abdominal pain, gas, and bloating occur. Furthermore, the weakening of the gut flora can lead to the multiplication of an opportunistic and dangerous bacterium called Clostridioides difficile, causing severe intestinal infections that may require hospitalization. In women, the disruption of vaginal flora paves the way for the development of yeast infections.

Apart from this, high-dose and long-term use can have toxic effects on the liver and kidneys. These organs are responsible for metabolizing medications and eliminating them from the body, and unnecessary use can strain organ functions. Allergic reactions are also common side effects; they can appear in a wide range from a mild skin rash to life-threatening anaphylactic shock that makes breathing difficult.

Golden Rules for Proper Antibiotic Use

To protect public health and maintain the effectiveness of medications, it is essential to strictly follow the rules of proper antibiotic use. The first and most important rule is that these medications should only be prescribed by a physician, when deemed necessary, and after appropriate tests are conducted. You should not start medication treatment by self-diagnosing or researching on the internet.

When your doctor prescribes a treatment, you must strictly follow the dosing schedule. Medications need to remain at a certain level in the blood; skipping a dose or delaying the time causes the bacteria to regain strength. Even if you feel completely healed during the treatment, you must never stop the treatment halfway until the medications in the box are finished or the period specified by your doctor has expired. Treatments stopped early allow the most resistant remaining bacteria to multiply.

You should not save leftover medications for potential future illnesses and must dispose of them according to medical waste procedures. Using someone else's prescribed medication is not only inappropriate for your type of illness but can also lead to serious side effects. The type, location, and severity of every infection are different; therefore, the active ingredient and dose of the medication to be used must be determined personally for you.

Diagnosis and Treatment of Resistant Infections

If a bacterial infection is suspected in a patient presenting to the hospital, microbiological tests are used to determine the right treatment. Samples taken from blood, urine, sputum, or a wound site are cultured in a laboratory setting. Once the bacterium causing the illness is identified, a susceptibility test called an antibiogram is performed to map out the treatment plan.

The antibiogram test clearly shows which medications the laboratory-grown bacterium is resistant to and which ones it is sensitive to. The result of this test usually comes out between 48 and 72 hours. Until the result is available, your doctor may start a broad-spectrum empirical treatment based on their experience and clinical findings. Once the test is finalized, a targeted treatment is initiated, focusing on the narrowest spectrum drug that targets only that specific bacterium.

If the bacterium the patient carries is resistant to standard medications, the treatment process becomes much more complex. Instead of oral pills taken at home, it may be necessary to use stronger medications with a higher potential for side effects, administered intravenously while hospitalized. This situation can extend the treatment period from days to weeks and seriously wear down the patient's overall health.

Complications and Being a Global Threat

Antibiotic resistance is not just an individual health problem; it is also one of the greatest global public health threats declared by the World Health Organization. Resistant bacteria know no borders; through travel, international trade, and hospital transfers, they can spread rapidly across continents, paving the way for pandemics.

The recovery process is much longer for patients who catch resistant infections. The failure of standard treatments increases hospital stays and places a massive economic burden on healthcare systems. Even more worrying is that even a simple urinary tract infection or a small skin cut can mix into the blood and lead to a fatal condition called sepsis if an effective medication cannot be found.

Risk groups with weak immune systems are particularly the most affected by this situation. For patients undergoing cancer treatment, organ transplant recipients, premature babies, and elderly individuals, the failure of medications is a life-threatening risk. If the resistance problem cannot be solved, routine surgical operations, cesarean deliveries, or prosthetic surgeries may become impossible to perform in the near future due to the risk of infection.

When to See a Doctor?

If you suspect you are experiencing a bacterial infection or if your current treatment is not showing the expected effect, you should visit a healthcare facility without wasting time. Especially if your symptoms are not improving despite strictly following your prescribed treatment, this is the most important sign that you are facing a resistant bacterium.

If you experience any of the following symptoms, you should see your doctor without delay:

• Persistent high fever that does not drop within 48-72 hours despite taking medication.
• Severe, watery, and bloody diarrhea starting during treatment.
• Shortness of breath, chest pain, or severe coughing fits.
• Confusion, excessive sleepiness, or sudden deterioration in general condition.
• Severe burning during urination, bleeding, or persistent flank pain.

Situations requiring emergency medical intervention are usually severe allergic reactions or blood poisoning (sepsis). If you experience swelling in the face, lips, or throat, wheezing that prevents breathing, widespread redness on the body, and a feeling of fainting shortly after taking the medication, you should immediately call 112 or go to the nearest emergency room.

The Process at BHT CLINIC

As BHT CLINIC İstanbul Tema Hastanesi, we provide services at international JCI quality standards regarding the accurate diagnosis of infectious diseases and the rational use of medications. Thanks to our hospital's fully equipped microbiology laboratory, we rapidly isolate the agents causing the infection and plan the most accurate treatment with antibiogram tests.

Our expert medical staff works meticulously to prevent unnecessary medication use and effectively combat resistant infections. In our Infectious Diseases department, all processes requiring inpatient or outpatient treatment are closely monitored. For unexpected allergic reactions or suddenly developing severe infection scenarios, our 24/7 emergency service is always by your side.

A doctor's examination is essential to avoid risking your health and to correctly learn the source of your complaints. Instead of self-medicating, you can easily book an appointment through our hospital's website or via our call center at 0850 811 34 00 to get an expert opinion.

Frequently Asked Questions

Are antibiotics painkillers or fever reducers?

No, antibiotics are not painkillers or fever reducers. They only treat infections caused by bacteria; as the infection heals, symptoms like fever and pain naturally disappear.

Can I stop taking the antibiotic once I feel better?

You absolutely should not stop. Even if symptoms ease, not all the bacteria in your body may have died yet. Stopping treatment early causes the surviving bacteria to gain resistance.

Do antibiotics work on viral infections?

No, antibiotics have no killing or healing effect on viruses. Using them for illnesses like the flu, common cold, or Covid-19 not only provides no benefit but also harms your body by disrupting your gut flora.

Can antibiotic resistance be reversed?

When rational drug use becomes widespread at the community level, a decrease in the resistance rates of some bacteria can be seen. However, it is very difficult to reverse it completely; therefore, the main goal is to prevent resistance from developing in the first place.

Should I keep leftover antibiotics at home?

Saving leftover medications for future illnesses and using them without a doctor's approval is extremely dangerous. After your treatment is finished, you should dispose of the remaining medications in accordance with medical waste rules.

This article is for informational purposes only; please consult your doctor for diagnosis and treatment.