When Antibiotics Are Unlikely to Help

Not receiving an antibiotic does not mean your symptoms are being dismissed. The decision should follow assessment of likely benefit, possible harm, illness severity and what happens if recovery does not follow the expected course.

The decision is about likely benefit Antibiotics are medicines used to treat some bacterial infections. They do not treat viral infections, including colds and many acute sore throats. However, the decision is not simply bacteria means antibiotics and virus means none. Some bacterial infections improve without antibiotics, while others require prompt treatment. Clinicians consider the likely cause, illness severity and risk of complications. They also consider the expected benefit, medicine harms, personal circumstances and review plan. This lesson uses a practical five question teaching framework. It is not a mandatory checklist and does not replace condition specific guidance. Five questions for an antibiotic decision First, what clinical outcome are we trying to improve? The aim may be faster recovery, relief of symptoms or prevention of a serious complication. Second, what options are reasonable now? Options may include no antibiotic, a back up antibiotic prescription, immediate antibiotics or further assessment. Third, what benefits, harms and burdens could each option bring? Antibiotics can help when the right medicine treats a susceptible bacterial infection. They can also cause nausea, diarrhoea, rashes and allergic reactions. Unnecessary exposure can select resistant bacteria and make later infections harder to treat. Fourth, what matters to this person, and what circumstances affect the plan? Relevant factors include illness severity, other conditions, medicines, allergies and reliable access to review. Fifth, how will the plan be reviewed? The person needs an expected course, safety netting and a clear route for further help. Acute sore throat as an example Acute sore throat includes inflammation of the throat or tonsils, called pharyngitis and tonsillitis. It is often triggered by a viral upper respiratory infection. NICE advises that symptoms can last around one week. This is often a self limiting infection, so most people improve without antibiotics, whether the cause is viral or bacterial. For many people, antibiotics make little difference to symptom duration. NICE reports an average reduction of about 16 hours in the relevant evidence. This average does not predict the exact benefit for one person. Some people are more likely to benefit because their features or clinical risk differ. Clinical scores support judgement NICE recommends FeverPAIN or Centor criteria for acute sore throat. These scoring tools estimate who may be more likely to benefit from an antibiotic. FeverPAIN considers recent fever, tonsillar pus, presentation within three days, severely inflamed tonsils, and the absence of cough or coryza. Coryza means cold symptoms such as a runny nose. Centor criteria use a different combination of fever, tonsillar exudate, tender neck glands and absence of cough. Exudate means visible material on the tonsils. A higher score increases the likelihood of a sore throat caused by streptococcal bacteria. It does not confirm a bacterial infection or replace assessment for serious illness. A lower score makes useful antibiotic benefit less likely. No single feature, including fever or tonsillar pus, proves that antibiotics are needed. How the score can change the plan For a FeverPAIN score of 0 or 1, or Centor score of 0 to 2, NICE advises no antibiotic prescription. For a FeverPAIN score of 2 or 3, NICE advises considering no antibiotic or a back up antibiotic prescription. The decision includes benefits, adverse effects and complication risk. For a FeverPAIN score of 4 or 5, or Centor score of 3 or 4, an immediate or back up prescription can be considered. These scores do not override severe illness. Immediate antibiotics are recommended when someone is very unwell overall, has signs of serious disease or has high complication risk. Hospital assessment may be needed for a severe infection affecting the whole body or a deep throat complication. The urgency depends on the complete clinical picture. What a back up prescription means A back up antibiotic prescription is not an instruction to start treatment immediately. It is used only if the agreed trigger occurs. For acute sore throat, NICE advises using it if symptoms do not start improving within three to five days. It may also be used if symptoms worsen rapidly or significantly. The prescriber should explain exactly when to start it and when to seek medical help instead. Different infections use different instructions. Do not use leftover antibiotics or antibiotics prescribed for someone else. When antibiotics are prescribed, take them exactly as directed and ask for advice about problems. Resistance happens in bacteria Antibiotic resistance means bacteria survive or grow despite an antibiotic that previously worked against them. Your body does not become resistant to antibiotics. Resistance can arise naturally, but antibiotic exposure selects bacteria able to survive. These bacteria can spread between people, animals and the environment. Antimicrobial stewardship means using antibiotics only when their likely benefits justify their harms. It also means choosing the right medicine, dose and duration when treatment is needed. Avoiding an unnecessary prescription protects the individual from side effects. It also helps preserve effective treatment for future patients. No antibiotic still needs a plan A no antibiotic decision should include symptom advice and safety netting. The usual course and reasons for reassessment should be clear. Seek medical help if symptoms worsen rapidly, become significantly worse, or do not start improving after about one week. Seek help sooner if you feel very unwell. Ask for urgent GP advice or contact NHS 111 for a very high temperature, shaking chills, dehydration or a weakened immune system. Call 999 or go to A&E for difficulty breathing, inability to swallow, drooling, stridor or severe symptoms worsening quickly. Stridor is a high pitched breathing sound. Pain when swallowing is common with a sore throat. Being unable to swallow saliva or drooling is a more serious pattern. Taking part in the decision You can ask which findings or score informed the recommendation. You can also ask how much benefit an antibiotic is expected to provide. Ask whether the plan is no antibiotic or a back up prescription. Confirm when to seek review and which changes need urgent help. Preferences matter, but they do not make an ineffective treatment effective. Shared decision making combines the evidence with your values and circumstances. This lesson explains professional antibiotic decisions. It is not a method for diagnosing an infection, calculating your own score or obtaining antibiotics without assessment.

An antibiotic decision weighs likely benefit against adverse effects, resistance and complication risk. For acute sore throat, FeverPAIN or Centor criteria support judgement, but scores and individual features do not confirm the cause alone.