Do You Need Antibiotics for a Sore Throat?
What UK guidance actually says about when antibiotics help, when they don’t, and how a prescriber decides.
Part of our Sore Throat condition guide.
Get urgent help first. Call 999 or go to A&E if you’re struggling to breathe, making a high-pitched sound when you breathe, drooling or can’t swallow your own saliva, or can’t open your mouth properly. Contact NHS 111 or your GP the same day if you have severe pain on one side of your throat, a very high temperature, or a weakened immune system. Online treatment isn’t suitable in these situations.
The key fact: most sore throats don’t need antibiotics — and across clinical trials, antibiotics shortened sore throat 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 aren’t appropriate, we’ll tell you.
Start Sore Throat Consultation →Adults only online. Our online antibiotic service is for adults aged 18 and over. A child with a sore throat should be assessed in person — by a GP, a community pharmacist through NHS Pharmacy First (age 5 and over), or NHS 111.
The short answer
Honestly? 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’s 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 whole purpose of a clinical assessment is to work out which group you fall into.
13–18%
chance of strep with a FeverPAIN score of 0 or 1 (NICE)
16 hrs
average symptom reduction from antibiotics
3–5 days
to wait before starting a back-up prescription
Why most sore throats don’t 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 don’t 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 isn’t 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 higher chance of streptococcal infection (62 to 65 per cent for FeverPAIN 4 or 5)
- Systemic illness — you’re 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 aren’t a way of hedging your bets. If you’re 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
It’s simpler than it sounds: you add up five things, 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% | No antibiotic, a back-up prescription, or an immediate antibiotic, especially if systemically unwell or at higher risk of complications. |
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 |
Access Doctor supplies phenoxymethylpenicillin as a 5-day course (2 × 250mg tablets four times a day) and clarithromycin as 250mg twice a day for 5 days, after an online consultation. The 5-day clarithromycin course follows NICE NG84 but is shorter than the 6 to 14 days in the product licence, so it is an off-label course length.
Why not amoxicillin?
Amoxicillin is a common antibiotic and people often expect it, but it’s 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 isn’t 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 doesn’t 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’re given the antibiotic but told not to start it unless things don’t improve within three to five days, or clearly worsen.
1
You receive the prescription but don’t 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’re not improving or you get worse
If symptoms are clearly settling, don’t start it. If they’re 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’s the point — it provides a safety net without committing everyone to a course they won’t need.
The cost of taking antibiotics you don’t need
Side effects
Antibiotics can cause nausea, diarrhoea, stomach upset or thrush, with no benefit if the infection is viral.
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 don’t 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 aren’t indicated
"No antibiotics" isn’t 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’s 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.
Find Out If You Need an Antibiotic
Complete a short online consultation and a GPhC-registered pharmacist independent prescriber will review your symptoms. If an antibiotic isn’t needed, they’ll tell you. Dispensed from our UK pharmacy. Approved before 3pm, Monday to Friday? Dispatched the same day, by Royal Mail Tracked 48, Tracked 24 or Special Delivery guaranteed by 1pm next working day: you choose.
Start Sore Throat Consultation →When to seek urgent help
Call 999 or go to A&E if there’s difficulty breathing, a high-pitched sound on breathing, drooling or inability to swallow saliva, inability to open the mouth properly, or a rash that doesn’t 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 can’t control, symptoms worsening after three to five days, a fine red rash, or if you have a weakened immune system.
UK safety and reporting side effects
Antibiotics for sore throat are prescription-only medicines in the UK. Before anything is prescribed, a GPhC-registered pharmacist independent prescriber reviews your consultation, including your allergies and the other medicines you take. Always read the patient information leaflet in the pack. Never share antibiotics with anyone else, even if their symptoms seem the same, and don’t keep leftovers for another time: return unused tablets to a pharmacy.
If you think you’ve had a side effect from a medicine, tell your pharmacist or doctor. You can also report it to the MHRA through the Yellow Card scheme, which helps keep medicines safe for everyone.
In England, people aged 5 and over may be able to get sore throat treatment free from a community pharmacy through the NHS Pharmacy First service, or from their GP. Our private online service is an alternative for adults aged 18 and over who would rather not wait for an appointment. You can see all our sore throat treatment online options on one page.
Frequently Asked Questions
Do I need antibiotics for a sore throat?
Most people don’t. Most adult sore throats are caused by viruses, which antibiotics can’t 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’re allergic to penicillin or can’t 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’re 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 can’t 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’s a prescription you hold onto and only start if your symptoms don’t 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 don’t need?
You get no benefit and you accept avoidable risk. Antibiotics can cause 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’ll 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 of sore throat treatment online is on one page.
Antibiotic · Rx
Phenoxymethylpenicillin 250mg
UK first-line antibiotic for a bacterial or strongly suspected strep sore throat.
View product →Antibiotic · Rx
Clarithromycin 250mg
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 aren’t 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 doesn’t constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.