Antibiotics: when they help and when they are completely useless

What is the difference between bacteria and viruses?

Before you can know when you need an antibiotic, you need to understand a basic distinction between two types of germs. Bacteria are single-celled living organisms that can survive and multiply independently inside your body, and antibiotics are designed to kill or disable them. Viruses are far smaller and structurally different: they invade your own cells and use their machinery to replicate. Antibiotics do nothing to viruses.

Most everyday illnesses are viral: the common cold, influenza, most sore throats, the majority of cases of diarrhoea, and many eye infections in winter. An antibiotic does not change the course of any of these, but it does disrupt the beneficial bacteria in your gut and contributes to building future resistance.

The confusion arises because symptoms often overlap: fever, fatigue, and a sore throat can be viral or bacterial. A doctor distinguishes between them by examination and sometimes a simple test. That is exactly why you should not decide for yourself whether you need an antibiotic.

When antibiotics help and when they do not

Bacterial tonsillitis caused by Streptococcal bacteria is a genuine case for an antibiotic. A doctor suspects it when they find swollen tonsils with a white coating, a high fever, and no cough. A throat swab can sometimes confirm it. In contrast, a viral sore throat that comes with a cold does not respond to any antibiotic.

Middle ear infection in children over two years often resolves on its own, so a doctor may issue a prescription but agree with parents to wait two days before filling it if the child is not deteriorating. In younger infants and in severe or complicated cases, prompt treatment is needed.

Urinary tract infections, bacterial pneumonia, bacterial skin infection (cellulitis), whooping cough, and severe bacterial diarrhoea such as salmonella all respond to antibiotics and need them. Common colds, influenza, COVID-19, and most mild diarrhoea do not.

Why selling antibiotics without a prescription is a real problem

A comprehensive study published in 2024 in Antimicrobial Resistance and Infection Control, covering 19 Arab countries, found that a significant proportion of pharmacies in the region dispense antibiotics without a prescription. This places the decision of whether to use an antibiotic in the hands of someone who lacks the tools to distinguish a condition that needs it from one that does not.

A 2017 systematic review also confirmed that antibiotic self-medication is very common across the Middle East, with many people reaching for them at the first sign of illness or on advice from a pharmacist or a relative. The problem is not bad intentions: it is that the body pays a hidden cost that is not immediately visible.

When you take an antibiotic without a true need, some of the bacteria in your body learn to resist it. The next time you genuinely need it, it may not work as well. Resistant bacteria also spread to others around you, turning an individual choice into a shared problem.

How to complete a course of antibiotics correctly

If a doctor prescribes you an antibiotic, completing every dose until the last tablet is a firm rule. Feeling better after two or three days does not mean the bacteria have been entirely eliminated. The weakest bacteria die first at the start of treatment, but the stronger ones remain and need more time. Stopping early gives these stronger bacteria a chance to multiply and resist the same drug in future.

There is a growing body of research suggesting that some bacterial infections may need shorter courses than was once thought, but this varies by bacteria type, antibiotic used, and organ involved. The rule you should follow is to take the course exactly as your doctor instructed: no more, no less, and no stopping on your own initiative.

Common side effects of antibiotics include digestive upset, nausea, and diarrhoea because they affect the beneficial bacteria in your gut. Eating before each dose reduces these symptoms in most cases. If you develop a rash, facial swelling, or breathing difficulty after a dose, these are signs of an allergic reaction and require stopping immediately and seeing a doctor.

What to do while waiting if the doctor says no antibiotic is needed

Most viral infections clear on their own within seven to ten days. A healthy immune system can overcome most of these viruses, and this is a well-established fact rather than carelessness about your health. What you can do is relieve symptoms and give your immune system the best conditions to work in. The psychological pull to take something is understandable, but an antibiotic that cannot help you is not a neutral act: it disrupts your gut bacteria, may cause side effects like nausea or diarrhoea, and contributes to resistance in the community.

Rest and adequate sleep genuinely speed recovery because the immune system works most efficiently during sleep. Drinking enough fluids prevents dehydration, which impairs immunity and worsens symptoms. Water, warm broth, and fresh juices are all good choices. Paracetamol or ibuprofen reduce fever and pain and make the waiting period more manageable. Handwashing protects others in the household from catching the same infection.

For a sore throat, warm drinks soothe the irritation and make swallowing easier. Gargling with warm salted water is a well-known regional remedy with a genuine soothing effect even if it does not treat the virus itself. Avoid spicy or very salty food during an inflamed throat. Staying in a warm environment and avoiding exertion reduces the energy drain on your immune system.

Monitor yourself while you wait. Improvement within three to five days is expected with most viral illnesses. If you start to worsen, or if new symptoms appear such as chest pain, severe difficulty swallowing, or a fever above 39 degrees Celsius that refuses to come down with painkillers, return to the doctor. A new assessment is always better than continuing to wait for an improvement that is not coming.

Sore throat: the most overmedicated condition in the region

Sore throat is the condition in which antibiotics are most frequently misused across the Arab world. The evidence from the 2023 Cochrane review covering decades of pooled trials is clear: antibiotics do not meaningfully shorten the duration of a viral sore throat, and most people recover from an ordinary sore throat within a week whether they take an antibiotic or not. Prescribing antibiotics for every sore throat does not make people better faster but it does make the bacteria in the community harder to treat.

The signs that lead a doctor to suspect a bacterial rather than viral cause include: a high fever with very painful swallowing, enlarged tonsils with a white or purulent coating, swollen lymph nodes in the neck, and no cough. This picture is very different from the sore throat that accompanies a common cold or influenza, where cough and runny nose are usually also present.

In many countries a rapid strep test confirms or rules out streptococcal bacteria in minutes. In other settings the doctor relies on clinical assessment, which is adequate in most cases. In either situation the doctor is the right decision-maker, not the pharmacist and not your memory of a previous episode. The fact that an antibiotic seemed to help last time does not mean today's sore throat is the same type or will respond to the same treatment.

For the pain while you wait, ibuprofen or paracetamol are effective and evidence-based. Warm liquids, throat lozenges, and rest all genuinely help. Most viral sore throats, even severe ones, resolve within five to seven days without any antibiotic.

When to seek urgent medical care

Some situations do not allow for waiting regardless of the cause. If the patient has a fever above 39.5 degrees Celsius alongside difficulty breathing or chest pain, this needs urgent assessment. Bacterial pneumonia and its complications can develop quickly and need the right treatment at the right time.

Neck stiffness combined with fever and severe headache is a dangerous combination requiring immediate emergency care, as it may point to bacterial meningitis. A rash that does not fade when you press on it combined with fever also needs urgent assessment.

Infants under three months of age with any fever should be seen by a doctor the same day. Elderly people and those with chronic conditions such as diabetes or kidney disease need faster assessment than a younger, otherwise healthy person.

Protecting your household from antibiotic resistance

Antibiotic resistance is one of the greatest health threats of the 21st century according to the World Health Organization. The numbers are alarming: resistant bacteria kill hundreds of thousands globally each year, and projections suggest this will rise sharply if prescribing habits do not change. The Arab region is particularly affected because the ease of obtaining antibiotics without a prescription has driven high rates of resistance, and your daily choices carry real weight in this equation.

At home, some simple habits make a genuine difference: never buy an antibiotic at a pharmacy without a prescription, never give leftover medicine to another family member even if their symptoms look identical because the dose and type may be completely different, and when a doctor does not prescribe an antibiotic understand that this decision is grounded in evidence and not negligence. Vaccination against influenza and pneumococcal disease reduces the need for antibiotics in the first place by preventing some infections before they start.

Teaching children proper handwashing reduces the spread of both bacterial and viral infections, and the evidence for this simple habit is robust. A household that understands the difference between a viral illness that needs no antibiotic and a bacterial one that does, and acts accordingly, is contributing not only to the health of its own members but to the wider community effort to slow resistance that harms everyone.

Sources

• Alhomoud F, Aljamea Z, Almahasnah R et al: Self-medication and self-prescription with antibiotics in the Middle East-do they really happen? A systematic review of the prevalence, possible reasons, and outcomes, International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases, 2017
• Hafez H, Rakab MS, Elshehaby A et al: Pharmacies and use of antibiotics: a cross sectional study in 19 Arab countries, Antimicrobial resistance and infection control, 2024
• Spurling GK, Dooley L, Clark J et al: Immediate versus delayed versus no antibiotics for respiratory infections, The Cochrane database of systematic reviews, 2023
• Sur DKC, Plesa ML: Antibiotic Use in Acute Upper Respiratory Tract Infections, American family physician, 2022
• Alghamdi S, Shebl NA, Aslanpour Z et al: Hospital adoption of antimicrobial stewardship programmes in Gulf Cooperation Council countries: A review of existing evidence, Journal of global antimicrobial resistance, 2018
• Al-Taie A, Hussein AN, Albasry Z et al: A Cross-Sectional Study of Patients' Practices, Knowledge and Attitudes of Antibiotics among Iraqi Population, Journal of infection in developing countries, 2021
• World Health Organization: Global action plan on antimicrobial resistance