Do You Need Antibiotics for a Sore Throat?
What UK guidance actually says about when antibiotics help, when they do not, and how a prescriber decides.
Part of the Sore Throat Treatment guide.
Key fact: Most sore throats do not need antibiotics — and even when a sore throat is bacterial, antibiotics shorten symptoms by only around 16 hours on average. Their real value is reducing complications and infectiousness in the minority of people who need them.
Get Assessed for Sore Throat Antibiotics Online
Access Doctor provides prescription antibiotics for infected sore throats following a GPhC-regulated online consultation with our pharmacist independent prescribers. If antibiotics are not appropriate, we will tell you.
Start Sore Throat Consultation →The short answer
Probably not. Most people with an acute sore throat get better in five to seven days with pain relief and simple self-care, and an antibiotic would add side effects without adding meaningful benefit. UK practice on antibiotics for sore throat is set out in NICE guideline NG84, which is deliberately restrictive about who should receive them.
There is a real minority who do benefit: people with a high likelihood of streptococcal infection, people who are systemically unwell, and people at higher risk of complications. The purpose of a clinical assessment is to identify which group you are in.
~70%
of adult sore throats are viral
16 hrs
average symptom reduction from antibiotics
1 in 10
experience side effects from penicillin V
Why most sore throats do not need them
Antibiotics kill bacteria. They have no effect whatsoever on viruses. Since colds, flu, adenovirus, COVID-19 and glandular fever cause the large majority of sore throats, an antibiotic in those cases is simply a tablet with side effects and no upside.
The less intuitive point is that even a bacterial sore throat is usually self-limiting. Group A streptococcal pharyngitis resolves without treatment in about a week in an otherwise healthy person. Antibiotics do not rescue you from a dangerous illness; they trim a few hours off the symptoms and lower an already small risk of complications.
Put plainly: if you take a full course of penicillin V for a sore throat, on average you feel better slightly less than one day sooner than if you had taken nothing. For most people that trade is not worth the side effects or the contribution to antibiotic resistance.
When do you need antibiotics for a sore throat?
NICE identifies specific circumstances where the balance tips.
- High symptom score — a FeverPAIN score of 4 or 5, or a Centor score of 3 or 4, indicating a 60 per cent or greater chance of streptococcal infection
- Systemic illness — you are notably unwell, not just uncomfortable: persistent high fever, unable to keep fluids down, marked malaise
- Signs of a more serious infection — one-sided severe pain, difficulty opening the mouth, or a muffled voice suggesting quinsy, which needs urgent assessment rather than a routine prescription
- Higher risk of complications — a weakened immune system, poorly controlled diabetes, chemotherapy, long-term steroid use, or a history of rheumatic fever
- Scarlet fever — the characteristic sandpaper rash with a sore throat is treated with antibiotics as standard in the UK
- Not improving on schedule — symptoms worsening after three to five days rather than settling
Diagnosis first: Antibiotics are not a way of hedging your bets. If you are unsure whether your sore throat is bacterial, the answer is an assessment, not a speculative course of penicillin. Our guide on sore throat vs strep throat walks through the distinguishing signs.
How prescribers decide: FeverPAIN and Centor
Rather than guessing, UK clinicians use validated scoring tools. NICE recommends FeverPAIN first, with Centor as an accepted alternative.
FeverPAIN
Five criteria, one point each: Fever in the last 24 hours; Purulence (pus on the tonsils); Attend rapidly, within three days of onset; Inflamed tonsils that are severely swollen; No cough or coryza.
| FeverPAIN score | Chance of strep | Recommended action |
|---|---|---|
| 0 or 1 | 13–18% | No antibiotic. Self-care, pain relief and advice on when to seek review. |
| 2 or 3 | 34–40% | No antibiotic, or a back-up prescription to use only if not improving in 3–5 days. |
| 4 or 5 | 62–65% | Immediate antibiotic is reasonable, especially if systemically unwell or higher risk. |
Centor
Four criteria, one point each: tonsillar exudate; tender anterior cervical lymph nodes; history of fever above 38C; absence of cough. A score of 0 to 2 makes strep unlikely. A score of 3 or 4 raises the probability to roughly 32 to 56 per cent and is the threshold at which an antibiotic is considered.
Which antibiotic is prescribed in the UK
| Antibiotic | Who it is for | Typical adult dose | Course |
|---|---|---|---|
| Phenoxymethylpenicillin (penicillin V) | First choice for everyone without penicillin allergy | 500mg four times daily, or 1000mg twice daily | 5–10 days |
| Clarithromycin | Penicillin allergy or intolerance | 250mg–500mg twice daily | 5 days |
| Erythromycin | Penicillin allergy in pregnancy | 250mg–500mg four times daily | 5 days |
Why not amoxicillin?
Amoxicillin is a common antibiotic and people often expect it, but it is deliberately not first line for sore throat. If the cause turns out to be glandular fever rather than strep — and the two can look near-identical — amoxicillin triggers a widespread itchy rash in a large proportion of people. That rash is not a true allergy but is frequently recorded as one, which unnecessarily limits a person's antibiotic options for the rest of their life. Phenoxymethylpenicillin has a narrower spectrum, works well against streptococcus, and does not carry that problem. We cover this fully in our guide to the best antibiotic for a sore throat.
Delayed and back-up prescriptions
For scores in the middle of the range, NICE recommends a back-up prescription: you are given the antibiotic but told not to start it unless things do not improve within three to five days, or clearly worsen.
1
You receive the prescription but do not start it
Treat with pain relief and self-care as normal, and keep the antibiotic in reserve.
2
You wait three to five days
This is the window in which most sore throats, viral and bacterial alike, start to turn the corner.
3
Start only if you are not improving or you get worse
If symptoms are clearly settling, do not start it. If they are static or worsening, begin the course and finish it.
4
Seek review at any point if red flags appear
Difficulty breathing or swallowing, drooling, or a rapidly worsening one-sided sore throat needs same-day assessment, not a back-up prescription.
Most people given a back-up prescription never use it. That is the point — it provides a safety net without committing everyone to a course they will not need.
The cost of taking antibiotics you do not need
Side effects
Roughly 1 in 10 people on penicillin V get nausea, diarrhoea, stomach upset or thrush.
Personal resistance
Bacteria you carry become harder to treat next time you genuinely need an antibiotic.
Population resistance
Antimicrobial resistance is one of the largest threats to modern healthcare, driven largely by unnecessary courses.
Gut microbiome disruption
Antibiotics do not discriminate between harmful and beneficial bacteria, and recovery can take weeks.
Allergy mislabelling
A drug rash during an unnecessary course can leave a permanent, often inaccurate, penicillin allergy record.
False reassurance
Attributing recovery to an antibiotic that did nothing reinforces the expectation of a prescription next time.
What to do instead when antibiotics are not indicated
"No antibiotics" is not the same as "nothing we can do". Symptom control is genuinely effective and is what most people actually want.
- Regular paracetamol or ibuprofen at the correct dose — the single most effective intervention for sore throat pain and fever
- Benzydamine spray or rinse — a topical anti-inflammatory and local anaesthetic that numbs the throat directly for painful swallowing
- Medicated lozenges containing a local anaesthetic or antiseptic
- Salt water gargles — half a teaspoon of salt in a glass of warm water, several times a day (not for young children)
- Cool fluids and soft foods — staying hydrated matters more than what you drink
- Rest and avoiding smoke — irritants prolong inflammation
Our guide on how to get rid of a sore throat fast goes through the evidence for each of these in more detail.
How to get antibiotics for a sore throat in the UK
All oral antibiotics in the UK are prescription-only medicines. There is no legal route to buying them over the counter, and any site offering to sell them without an assessment should be avoided.
There are three legitimate routes. Your GP practice can assess and prescribe. Some community pharmacies offer NHS sore throat services under the Pharmacy First scheme in England, where a pharmacist can supply an antibiotic directly if criteria are met. And regulated online pharmacies can prescribe following a clinical consultation.
Order Sore Throat Antibiotics After a Clinical Assessment
Complete a short online consultation and a GPhC-registered pharmacist independent prescriber will review your symptoms. Where an antibiotic is appropriate, it is dispensed from our UK pharmacy and delivered discreetly.
Order Phenoxymethylpenicillin →When to seek urgent help
Call 999 or go to A&E if there is difficulty breathing, a high-pitched sound on breathing, drooling or inability to swallow saliva, inability to open the mouth properly, or a rash that does not fade under pressure from a glass.
Contact NHS 111 or your GP the same day for severe one-sided throat pain, a very high temperature you cannot control, symptoms worsening after three to five days, a fine red rash, or if you have a weakened immune system.
Frequently Asked Questions
Do I need antibiotics for a sore throat?
Most people do not. Around 70 per cent of adult sore throats are caused by viruses, which antibiotics cannot treat, and even bacterial sore throats settle on their own in about a week. UK guidance recommends antibiotics only where a scoring tool such as FeverPAIN suggests a high chance of streptococcal infection, where you are systemically unwell, or where you are at higher risk of complications. For everyone else, pain relief and self-care are the correct treatment.
What antibiotic is prescribed for a sore throat in the UK?
Phenoxymethylpenicillin, also known as penicillin V, is the first-choice antibiotic in UK guidance. Adults are usually prescribed 500mg four times a day, or 1000mg twice a day, for 5 to 10 days. If you are allergic to penicillin or cannot tolerate it, clarithromycin is the recommended alternative, usually 250mg to 500mg twice a day for 5 days. Erythromycin is used instead of clarithromycin in pregnancy.
How much faster do antibiotics make a sore throat better?
Less than most people expect. Across clinical trials, antibiotics shorten sore throat symptoms by roughly 16 hours on average. They are prescribed mainly to reduce the small risk of complications such as quinsy and to shorten how long you remain infectious to others, rather than to produce a dramatic improvement in how you feel. This modest benefit is why prescribers weigh it against the side effects and the wider harm of antibiotic resistance.
Can I buy antibiotics for a sore throat over the counter in the UK?
No. All oral antibiotics are prescription-only medicines in the UK and cannot be sold over the counter. You can, however, request them through a regulated online consultation. At Access Doctor a GPhC-registered pharmacist independent prescriber reviews your symptoms and medical history and issues a prescription only where an antibiotic is clinically appropriate. Anyone selling antibiotics without an assessment is operating illegally.
What is a delayed or back-up antibiotic prescription?
It is a prescription you hold onto and only start if your symptoms do not begin improving within three to five days, or if they get significantly worse. NICE recommends this approach for people with a moderate FeverPAIN score of 2 or 3, where the chance of bacterial infection is around 34 to 40 per cent. Research shows most people given a back-up prescription never need to use it, which reduces unnecessary antibiotic exposure without leaving anyone stranded.
What happens if I take antibiotics I do not need?
You get no benefit and you accept avoidable risk. Around one in ten people taking penicillin V experience side effects such as nausea, diarrhoea or thrush, and unnecessary courses drive antibiotic resistance both in you personally and across the population. Repeated unnecessary exposure also disrupts the gut microbiome. This is why UK prescribers apply symptom scoring rather than prescribing on request.
Do I have to finish the whole antibiotic course?
Yes, take the full course exactly as prescribed. Sore throat courses run for 5 to 10 days depending on the antibiotic, and you will usually feel better after two or three days, well before the course ends. Stopping early risks the infection returning and gives surviving bacteria a better chance of developing resistance. If side effects are making it difficult to continue, speak to your prescriber or pharmacist rather than simply stopping.
Completing the treatment
Whether your sore throat needs an antibiotic or just effective pain relief, Access Doctor can supply the appropriate option after a short online consultation reviewed by a GPhC-registered pharmacist independent prescriber. The full range is on the sore throat treatment page.
Antibiotic · Rx
Phenoxymethylpenicillin 250mg
UK first-line antibiotic for a bacterial or strongly suspected strep sore throat.
View product →Antibiotic · Rx
Clarithromycin 500mg
Recommended alternative where there is penicillin allergy or intolerance.
View product →Pain relief · P
Difflam Sore Throat Spray
Benzydamine spray for targeted relief when antibiotics are not indicated.
View product →Pain relief · P
Difflam Oral Rinse
Benzydamine gargle covering the throat and mouth more widely than a spray.
View product →References
- National Institute for Health and Care Excellence. Sore throat (acute): antimicrobial prescribing (NG84). 2018, updated. nice.org.uk
- NICE Clinical Knowledge Summaries. Sore throat – acute. cks.nice.org.uk
- NHS. Sore throat. nhs.uk
- NHS England. Pharmacy First service. england.nhs.uk
- Joint Formulary Committee. British National Formulary: phenoxymethylpenicillin. bnf.nice.org.uk
- Joint Formulary Committee. British National Formulary: clarithromycin. bnf.nice.org.uk
- UK Health Security Agency. Antimicrobial resistance: ESPAUR report. gov.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.