Augmentin (Amoxicillin / Clavulanate) – Patient Guide (UK)

Augmentin is an antibiotic medicine used to treat certain bacterial infections. It contains two active ingredients: amoxicillin and clavulanate. This combination helps widen the range of bacteria that can be treated, including some that would otherwise resist amoxicillin alone.

This guide explains what Augmentin is, how it works, when it’s used, how to take it safely, and what to expect. It is written for patients in the United Kingdom.

Quick overview

• Brand name: Augmentin
• Active ingredients: Amoxicillin + Clavulanate
• Type of medicine: Antibiotic (penicillin/β-lactam + β-lactamase inhibitor)
• Common forms in the UK: tablets, dispersible tablets, and oral suspensions (strengths vary)
• Used for: selected bacterial infections such as ear, sinus, chest, skin, and urinary tract infections (depending on local guidance and susceptibility)
• Key safety notes: possible allergy to penicillins; diarrhoea/indigestion are common; rare serious reactions can occur

Basic product information (UK)

Augmentin is licensed in the UK for a range of bacterial infections. The exact strength and formulation (for example, amoxicillin/clavulanate 500/125 mg, 875/125 mg, or suspensions) should match the condition and patient factors such as age and kidney function.

Because strengths vary, it’s important to check the label for the exact dose and frequency. Your pharmacist can help confirm how to take the specific product you have.

How Augmentin works (mechanism of action)

Amoxicillin is a member of the penicillin antibiotic group. It works by interfering with how bacteria build and maintain their cell walls, leading to bacterial death.

Some bacteria produce β-lactamase enzymes that can break down amoxicillin and make it less effective. Clavulanate is a β-lactamase inhibitor, which helps protect amoxicillin from these enzymes.

Together, amoxicillin/clavulanate broadens activity against certain bacteria that would be resistant to amoxicillin alone.

Pharmacokinetics (how the body handles it)

The following points describe general behaviour of amoxicillin/clavulanate in the body. Exact levels can vary between individuals and formulations.

• Absorption: Both components are absorbed from the gut. Taking the dose with food can improve tolerability and may improve absorption in some people.
• Distribution: Amoxicillin distributes into many tissues and body fluids; clavulanate is also distributed, though to a lesser extent.
• Metabolism: Only limited metabolism occurs; most of the active drug is eliminated.
• Elimination: Primarily through the kidneys. Dose adjustment may be needed in people with reduced kidney function.
• Half-life: The clearance of both components can vary, but the kidneys are the main route of elimination.

Practical implication: If you have kidney problems, your prescriber/pharmacist may choose a different strength or adjust the dosing interval. Always follow the instructions on your medication label.

Typical uses and indications (what it can be used for)

Augmentin is used for confirmed or strongly suspected bacterial infections where amoxicillin/clavulanate is considered appropriate. In the UK, antibiotic selection typically takes account of:

• likely bacteria causing the infection
• local resistance patterns
• patient factors (allergies, kidney function, age)
• previous antibiotic exposure

Common indications may include:

• ENT (ear, nose and throat) infections such as acute bacterial sinusitis and some cases of acute otitis media (middle ear infection)
• Chest infections where bacterial causes are suspected (for example, certain bacterial exacerbations of chronic lung disease—depending on clinical assessment)
• Skin and soft tissue infections such as cellulitis (depending on severity and assessment)
• Urinary tract infections (UTIs) when bacterial infection is considered likely and susceptible
• Dental infections that require antibiotic cover in addition to dental management
• Other infections as advised by healthcare professionals

Important: Antibiotics do not treat viral infections such as colds, most sore throats, and influenza. Taking antibiotics when they aren’t needed can contribute to antibiotic resistance and may cause unnecessary side effects.

Timing: how to take Augmentin

Timing depends on the strength and formulation prescribed for you. Many regimens are taken either twice daily or three times daily. Always use the directions on your medicine label.

• Try to space doses evenly. For example, if twice daily, take about 12 hours apart.
• Take with food if possible. This can reduce the chance of stomach upset.
• Finish the full course unless told to stop by a healthcare professional. Stopping early may allow infection to return.

If you miss a dose, do not take a double dose to make up for it. Instead, follow the advice given on the medicine label or by your pharmacist.

Food interactions: what to eat and drink

Augmentin is generally well tolerated when taken with food. Food may:

• improve absorption for some people
• reduce nausea, indigestion, and diarrhoea

There are no commonly required special diets with Augmentin. However:

• Stay hydrated, particularly if you experience mild diarrhoea.
• If you have recurrent stomach upset, discuss options with your pharmacist (such as formulation changes).

Alcohol and medicine interactions

Alcohol

While there is not a universal “hard stop” with alcohol for everyone taking antibiotics, it’s generally best to avoid or limit alcohol during your course—especially if you feel unwell, are at risk of dehydration, or experience stomach side effects. Alcohol can worsen nausea and may affect recovery.

Medication interactions (important examples)

Augmentin can interact with other medicines. Tell your pharmacist or healthcare professional about all medicines you take, including over-the-counter products and herbal remedies.

Key interactions include:

• Oral anticoagulants (blood thinners) such as warfarin: antibiotic therapy may affect clotting control (INR). Close monitoring may be needed.
• Allopurinol (for gout): may increase the risk of skin rash in some people.
• Methotrexate: antibiotics may reduce clearance, potentially increasing methotrexate levels—this can be clinically important.
• Probenecid: may reduce renal clearance of amoxicillin, potentially increasing levels.
• Oral typhoid vaccine (Ty21a): antibiotics can reduce its effectiveness—seek advice if you need vaccination.

Probiotics/antacids: There is no need for a routine change to antacid use, but if you plan to add probiotics or other products, discuss with your pharmacist, particularly if you have complex medical conditions.

Dosing: general principles (UK)

The exact dose of Augmentin depends on the infection type and severity, patient age/weight, and kidney function, as well as the specific formulation and strength.

Always follow the dosing instructions on your label. Do not use another person’s medicine even if they have similar symptoms.

Common dosing patterns in practice (varies by strength and indication) include:

• Twice daily regimens (often for certain adult strengths)
• Three times daily regimens (often with other strengths and certain paediatric schedules)

Children: Paediatric dosing is frequently weight-based and may use oral suspension formulations. Parents/carers should measure doses carefully and ensure correct shaking/preparation of suspensions.

Kidney impairment: Dose adjustment may be required. If you have known reduced kidney function, confirm the dosing schedule with a healthcare professional.

Safety profile: common, serious, and when to seek help

Like all medicines, Augmentin can cause side effects. Many people experience none or only mild effects. Below is a patient-friendly overview of commonly reported and potentially serious reactions.

Common side effects

• Diarrhoea (often mild)
• Nausea or vomiting
• Indigestion
• Skin rash (can occur)
• Headache

Taking doses with food can help reduce stomach upset. If diarrhoea is severe or persistent, speak to a healthcare professional promptly.

Serious side effects (urgent medical attention)

Seek urgent medical help if you develop signs of a serious allergic reaction or other serious conditions.

• Signs of allergy: swelling of the face/lips/tongue, difficulty breathing, wheezing, severe dizziness, or widespread rash with blistering
• Severe or watery diarrhoea or diarrhoea with blood/mucus, especially with fever or abdominal pain (possible severe gut inflammation)
• Yellowing of the skin/eyes (jaundice), dark urine, or unusual tiredness (possible liver-related reaction)
• Severe skin reactions such as blistering/peeling
• Persistent fever or worsening symptoms after starting treatment

Allergy and intolerance

Augmentin contains a penicillin-type antibiotic. If you’ve ever had an allergic reaction to penicillins or other β-lactam antibiotics (including some cephalosporins), let a healthcare professional know. If you develop allergy symptoms during treatment, stop taking the medicine and seek urgent advice.

Practical use tips (how to take Augmentin safely)

• Check the strength: Different formulations contain different amounts of amoxicillin and clavulanate.
• Take with food: helps reduce stomach side effects.
• Complete the course: even if you feel better, unless advised otherwise.
• For suspensions: shake well before measuring; use the provided oral syringe/measure and follow reconstitution/storage instructions on the label.
• Good hygiene: handwashing and hydration can support recovery alongside antibiotics.
• Monitor symptoms: improvement usually occurs within a few days. If symptoms worsen or do not improve, contact a clinician.
• Track side effects: mild diarrhoea may occur. Seek advice for severe or persistent symptoms.

What to expect during treatment

Many patients notice symptom improvement within 48–72 hours of starting antibiotics (though this can vary by infection type and severity). If you have no improvement, or you become worse, you should seek medical advice.

If you experience persistent diarrhoea or new rash during treatment, speak to a healthcare professional. Don’t stop the antibiotic without advice unless you suspect a serious allergic reaction.

Alternative options

The best alternative depends on the infection type, local resistance patterns, allergy history, and patient-specific factors. Alternatives healthcare professionals may consider include:

• Amoxicillin alone (if clavulanate is not required)
• Cephalosporins (only if appropriate and depending on allergy history)
• Macrolides (e.g., for certain respiratory or ENT infections when suitable)
• Other antibiotic classes based on culture results/susceptibility
• Watchful waiting and supportive care for conditions where antibiotics may not be beneficial

Your clinician/pharmacist can advise what’s appropriate for your specific situation. If you have a penicillin allergy, make sure alternatives are chosen with caution.

Market and legal context for the United Kingdom

In the UK, antibiotics such as Augmentin are regulated medicines. They are supplied under UK medicines legislation and must be used in line with UK prescribing and antimicrobial stewardship guidance.

Antibiotic use is supported by evidence-based clinical pathways and public health recommendations, including efforts to reduce inappropriate prescribing and slow the spread of antibiotic resistance.

Antimicrobial stewardship aims to:

• use antibiotics only when bacterial infection is likely
• choose the narrowest effective option
• use the correct dose and duration
• monitor and review response to treatment

Augmentin should be stored and handled according to the instructions provided with your specific product.

Recent guidance and stewardship considerations (UK)

UK guidance on antibiotic use continues to emphasise appropriate prescribing, careful assessment of symptoms, and consideration of local resistance data. For common infections (such as sore throat, many coughs, and most colds), antibiotics are often not needed. When antibiotics are recommended, they should be reviewed if symptoms do not improve.

Patients should be aware that:

• antibiotics are not suitable for viral illness
• resistance can reduce future effectiveness
• unnecessary antibiotics can cause avoidable side effects

Delivery and availability (UK)

Augmentin is commonly available through UK pharmacies in multiple strengths and formulations. Availability can vary depending on demand, formulation type (e.g., suspensions versus tablets), and specific strengths.

For online pharmacy orders, delivery typically follows:

• Standard delivery: several working days (varies by retailer)
• Express delivery: sometimes available for eligible postcodes and stock
• Cold-chain storage: usually not required for Augmentin under standard conditions, but always check your product label

Before ordering, ensure you have the correct strength and form listed on your medicine packaging. If you’re unsure, contact a pharmacist for guidance.

Storage

Store Augmentin according to the leaflet or label instructions:

• Keep tablets/sachets/suspensions as directed (commonly at room temperature for many formulations).
• For suspensions, check the label for reconstitution and storage after preparation.
• Keep out of the sight and reach of children.
• Do not use after the expiry date.

FAQ

1) What is Augmentin used for?

Augmentin is used to treat certain bacterial infections where amoxicillin/clavulanate is suitable, such as some ear, sinus, chest, skin, dental, and urinary infections depending on clinical assessment.

2) How quickly should I feel better?

Many people start to feel improvement within 48–72 hours. If you do not improve, worsen, or develop severe side effects, seek medical advice promptly.

3) Should I take Augmentin with food?

Taking Augmentin with food can help reduce stomach upset such as nausea and diarrhoea. If you can, take it at mealtimes or with a snack.

4) Can I drink alcohol while taking Augmentin?

It’s generally best to avoid or limit alcohol during treatment, especially if you feel unwell or have stomach side effects. If you’re unsure, ask a pharmacist for advice based on your health situation.

5) What if I miss a dose?

Take it as soon as you remember unless it is close to the time for the next dose. Do not take a double dose. Check the advice on your medicine label or speak to your pharmacist.

6) Can Augmentin cause diarrhoea?

Yes. Mild diarrhoea can occur. However, severe watery diarrhoea, diarrhoea with blood/mucus, or diarrhoea with fever and significant abdominal pain should be reported urgently.

7) Is Augmentin safe for children?

Augmentin can be used in children, but the correct formulation and weight-based dose must be chosen. Always use the dose and measuring method on the label and leaflet.

8) What should I do if I have a penicillin allergy?

If you have had an allergic reaction to penicillins or other β-lactam antibiotics, tell a healthcare professional before using Augmentin. If allergy symptoms occur during treatment (such as swelling or breathing difficulties), seek urgent help.

9) Does Augmentin interact with warfarin?

Yes, antibiotics including amoxicillin/clavulanate can affect clotting control. People taking warfarin may need closer INR monitoring during antibiotic treatment.

10) Are there alternatives to Augmentin?

Depending on the infection and your medical history, clinicians may consider other antibiotics or, in some conditions, supportive care without antibiotics. The best choice varies case by case.

Need advice? If you have questions about your specific Augmentin strength or how to take it, a UK pharmacist can help you check the dosing instructions and assess any interactions based on your other medicines and health conditions.