Antibiotics for a Cold or Sore Throat: Do You Need Them?

The Fundamental Rule: Bacteria vs Viruses

Antibiotics are medicines designed to kill or stop the growth of bacteria. They have absolutely no effect on viruses. This distinction matters because the overwhelming majority of common infections that send Australians to the GP — colds, sore throats, coughs, and flu — are viral.

When your GP says 'you don't need antibiotics for this,' they are not being dismissive. They are giving you evidence-based advice. Taking antibiotics for a viral infection will not make you feel better faster, will not prevent complications, and may cause side effects like diarrhoea, nausea, and thrush. Worse, it contributes to antibiotic resistance — making these medicines less effective for everyone.

Common Conditions That Do NOT Need Antibiotics

The following conditions are almost always viral. In the vast majority of cases, antibiotics will not help.

Conditions That DO Need Antibiotics

Some infections are genuinely bacterial and require antibiotic treatment. Your GP will determine this through examination, symptoms, and sometimes testing.

How to Tell If It's Viral or Bacterial

Honestly? You often cannot tell without a doctor. That is exactly why self-prescribing or pressuring your GP for antibiotics 'just in case' is a bad idea. However, some patterns can give you clues.

The 'double worsening' pattern is one of the most reliable warning signs. If you had a cold that was improving and then you suddenly spike a fever or develop severe sinus pressure, that suggests a secondary bacterial infection has developed on top of the original virus. That is when antibiotics may genuinely be needed.

The Antibiotic Resistance Crisis in Australia

Antibiotic resistance occurs when bacteria evolve to survive the antibiotics designed to kill them. Every time antibiotics are used — whether appropriately or not — bacteria have an opportunity to develop resistance. The more unnecessarily we use antibiotics, the faster resistance spreads.

This is not a hypothetical future problem. It is happening now. Globally, antimicrobial resistance is estimated to contribute to around 1.27 million deaths every year. In Australia, according to the Australian Commission on Safety and Quality in Health Care, antibiotic-resistant infections already cause significant illness and death in our hospitals annually. The AURA (Antimicrobial Use and Resistance in Australia) Surveillance System has repeatedly found that Australia has among the highest rates of community antibiotic prescribing in the developed world.

What Australia is doing about it

• radio_button_uncheckedThe Australian Government's National Antimicrobial Resistance Strategy (2020 and beyond) sets targets for reducing inappropriate prescribing.
• radio_button_uncheckedThe NPS MedicineWise campaign has run public awareness campaigns encouraging Australians to ask 'Do I really need antibiotics?'
• radio_button_uncheckedAntimicrobial stewardship programs in Australian hospitals monitor and guide antibiotic use.
• radio_button_uncheckedThe TGA regulates antibiotic availability — all antibiotics in Australia require a prescription (unlike some countries where they are sold over the counter).

What you can do

• radio_button_uncheckedNever pressure your GP for antibiotics. Trust their clinical judgement.
• radio_button_uncheckedNever take leftover antibiotics from a previous illness or from someone else.
• radio_button_uncheckedIf prescribed antibiotics, take the full course as directed — even if you feel better early.
• radio_button_uncheckedAsk your GP or pharmacist: 'Do I actually need antibiotics for this, or will it get better on its own?'
• radio_button_uncheckedGet vaccinated. Flu vaccination and other immunisations prevent infections that can lead to secondary bacterial infections requiring antibiotics.

What to Use Instead: OTC Alternatives for Viral Infections

If your infection is viral, the goal is symptom relief while your body fights it off. Here are evidence-based OTC options available at Australian pharmacies.

Pain and fever

Paracetamol is the first-line choice for pain, headache, sore throat pain, and fever. Ibuprofen is an alternative when inflammation is a factor, such as with sinus pressure or severe sore throat. Both are effective, well-tolerated, and widely available.

Nasal congestion and sinusitis

For a blocked nose, a decongestant containing pseudoephedrine (available behind the pharmacy counter) is the most effective OTC option. Saline nasal spray is a drug-free alternative that helps wash out mucus and can be used as often as needed. For ongoing sinus congestion, steam inhalation can provide temporary relief.

Sore throat

Most sore throats are viral and will resolve within a few days. In the meantime, medicated lozenges, anti-inflammatory throat sprays, and gargling solutions can provide meaningful symptom relief. Honey in warm water is a simple home remedy with some evidence behind it for soothing throat irritation.

Multi-symptom cold and flu relief

If you have several cold or flu symptoms at once, a combination cold and flu tablet can be convenient. These typically contain paracetamol, a decongestant, and sometimes an antihistamine for nighttime use. Be careful not to take extra paracetamol on top — always check the active ingredients on every product you are taking.

How to Talk to Your GP About Antibiotics

Research shows that many antibiotic prescriptions are driven not by clinical need but by patient expectations. Some GPs report feeling pressured by patients who arrive expecting a script. Having an open, informed conversation helps both of you.

Good questions to ask your GP

• radio_button_unchecked'Is this likely to be viral or bacterial?' — This shows you understand the difference and are not just asking for a script.
• radio_button_unchecked'Will antibiotics actually help me get better faster?' — For viral infections, the honest answer is no.
• radio_button_unchecked'What is the best way to manage my symptoms while this clears up?' — Your GP can recommend specific OTC products suited to you.
• radio_button_unchecked'What symptoms should bring me back?' — This is a smart question. It gives you a safety net without needing unnecessary antibiotics.
• radio_button_unchecked'Could this be a case for delayed prescribing?' — Some GPs offer a 'delayed prescription' that you only fill if symptoms worsen or do not improve after a few days. This reduces unnecessary antibiotic use while giving you peace of mind.

When to See a Doctor

While most viral infections resolve on their own, there are genuine red flags that warrant a GP visit. Some of these may indicate a secondary bacterial infection that does require antibiotics.

Seek urgent medical attention if

• radio_button_uncheckedYou have difficulty breathing or are breathing rapidly
• radio_button_uncheckedYou cannot keep fluids down due to severe vomiting
• radio_button_uncheckedYou have a rash that does not fade when you press a glass against it
• radio_button_uncheckedYou feel confused or extremely drowsy
• radio_button_uncheckedYour child has a febrile seizure

If You Are Prescribed Antibiotics: How to Take Them Properly

When your GP does prescribe antibiotics, using them correctly is essential for them to work — and to reduce the risk of resistance.

• radio_button_uncheckedTake the full course as directed, even if you feel better before it is finished. Stopping early can leave surviving bacteria that are more resistant.
• radio_button_uncheckedTake them at the right times. If it says 'three times daily,' space them roughly eight hours apart — not just at mealtimes.
• radio_button_uncheckedCheck if you should take them with food or on an empty stomach. This varies by antibiotic and affects absorption.
• radio_button_uncheckedDo not share your antibiotics with anyone else. What was prescribed for you may be wrong for someone else.
• radio_button_uncheckedDo not save leftover antibiotics for later. If you have completed the course and have tablets left, return them to your pharmacy for safe disposal.
• radio_button_uncheckedAsk your pharmacist about interactions. Some antibiotics interact with other medicines, alcohol, dairy, or certain foods.

Frequently Asked Questions

What are the signs you need antibiotics?

Antibiotics are only needed when an infection is bacterial. Signs that point towards a bacterial infection (and a GP visit) include symptoms lasting more than 10 days without improvement, symptoms that improve and then suddenly get worse ('double worsening'), a high fever above 38.5 degrees C lasting more than 3 days, or severe, localised pain such as one-sided sinus pain, ear pain, or throat pain so bad you cannot swallow. Spreading redness or warmth on the skin can also indicate a bacterial infection. Only a doctor can confirm whether antibiotics are appropriate, sometimes with a swab or test.

How do I tell if my infection is bacterial or viral?

You often cannot tell for certain without a doctor, which is why self-diagnosing is risky. As a guide, viral infections tend to come on gradually, cause several symptoms at once (runny nose, cough, sneezing, mild sore throat), and start improving within 7 to 10 days. Bacterial infections are more likely to cause severe, localised symptoms, a persistent high fever, or a 'double worsening' where you start to recover and then get worse again. If you are unsure, your GP can examine you and, where needed, run a test.

Will my body fight off an infection without antibiotics?

Yes — for viral infections like colds, the flu, and most sore throats, your immune system clears the infection on its own, usually within 7 to 10 days. Antibiotics cannot speed this up because they have no effect on viruses. Signs your body is doing its job include a mild fever (a normal immune response), and symptoms that gradually ease day by day. The best support you can give your body is rest, fluids, and OTC symptom relief while it recovers. If you are not improving after about 10 days, or you get worse after starting to improve, see your GP.

Is it bad to take antibiotics when you don't need them?

Yes. Taking antibiotics for a viral infection will not help you recover and carries real downsides. They can cause side effects such as diarrhoea, nausea, and thrush, and they disrupt the helpful bacteria in your gut. Most importantly, every unnecessary course gives bacteria another chance to develop resistance, making antibiotics less effective for you and everyone else in the future. This is why Australian guidelines encourage using antibiotics only when they are genuinely needed.

Do I need antibiotics for a cough?

Usually not. Most coughs are caused by viral infections such as a cold or acute bronchitis, and antibiotics do not shorten them or reduce their severity. A cough after a viral illness can linger for 2 to 3 weeks as your airways recover, which is normal. OTC options like simple linctus, honey in warm water, and steam inhalation can ease the symptom. See your GP if you cough up blood, are short of breath, have chest pain, run a high fever, or the cough lasts beyond about 3 weeks — these can signal a chest infection like bacterial pneumonia that may need antibiotics.

My mucus is green — doesn't that mean I need antibiotics?

No. Green or yellow mucus is produced by your immune system's white blood cells fighting the infection. It happens with viral infections just as commonly as bacterial ones. Mucus colour alone is not a reliable way to determine whether you need antibiotics. If your symptoms have persisted for more than 10 days or are getting worse after initially improving, see your GP.

Can I buy antibiotics over the counter in Australia?

No. All oral antibiotics in Australia are prescription-only medicines (Schedule 4). You must see a GP or eligible health practitioner to get a prescription. Some topical antibiotic preparations (like antiseptic creams for minor cuts) are available without a prescription, but these are not the same as systemic antibiotics used for internal infections. This prescription requirement is an important safeguard against antibiotic resistance.

Will taking antibiotics 'just in case' prevent a bacterial infection from developing?

Generally no. Prescribing antibiotics preventively for a viral infection is not supported by evidence for most people. It does not reduce your risk of developing a secondary bacterial infection, but it does increase the risk of antibiotic side effects and resistance. There are specific medical situations where preventive antibiotics are appropriate (such as before certain surgeries), but your GP will make that call based on your individual circumstances.

I always get antibiotics for a sore throat — should I stop?

Most sore throats in adults are viral and will resolve within 3-7 days without antibiotics. The exception is strep throat (caused by Group A Streptococcus bacteria), which accounts for roughly 10-15 percent of adult sore throats. If your GP suspects strep, they can confirm with a rapid strep test or throat swab. If the test is positive, antibiotics are appropriate. If negative or not suspected, OTC pain relief and sore throat lozenges are the better option.

What is antimicrobial resistance and why should Australians care?

Antimicrobial resistance (AMR) occurs when bacteria, viruses, fungi, and parasites evolve to resist the medicines designed to kill them. Antibiotic resistance is the most well-known form of AMR. Australia has a particular responsibility because we are one of the highest per-capita users of antibiotics in the developed world. Without action, common infections and routine surgeries could become life-threatening within a generation. The Australian Government's AURA surveillance program monitors this threat and publishes regular reports on antimicrobial use and resistance nationally.

Should I take probiotics with antibiotics?

There is some evidence that certain probiotic strains may help reduce antibiotic-associated diarrhoea, which is one of the most common side effects of antibiotics. However, the evidence is not strong enough to make a blanket recommendation, and the best strain and dose are not settled. If you are interested, ask your pharmacist for a product containing Saccharomyces boulardii or Lactobacillus rhamnosus GG, which have the most research behind them. Take probiotics at a different time of day from your antibiotic dose.