Verified
I took the tablets with breakfast and dinner as prescribed. The sinus pressure improved after several days, but the first two doses caused nausea. Eating before the tablet made a noticeable difference.
31 Oct 2026
Augmentin
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Active ingredient
Amoxicillin
Augmentin is a penicillin-class antibiotic for adults and children with susceptible bacterial infections. Its amoxicillin component attacks bacteria, while clavulanate helps protect it from selected beta-lactamase enzymes.
Description
Augmentin is a penicillin-class antibiotic containing amoxicillin and clavulanate potassium. It is prescribed for adults and children with susceptible bacterial infections, including some sinus, chest, urinary, skin, and dental infections. The combination helps amoxicillin remain active against bacteria that produce beta-lactamase enzymes.
Composition
Augmentin tablets contain the antibacterial agent amoxicillin together with clavulanate potassium. The product supplied on this page is a 625 mg tablet presentation with 20 tablets. Amoxicillin belongs to the penicillin family of beta-lactam antibiotics, while clavulanate acts as a beta-lactamase inhibitor.
Amoxicillin interferes with bacterial cell-wall construction. Without a stable cell wall, susceptible bacteria cannot grow and survive. Clavulanate protects amoxicillin from selected beta-lactamase enzymes, which some bacteria produce as a defence against penicillin antibiotics. This combination does not overcome every form of antibiotic resistance, so the likely organism and its sensitivity still matter.
Role of clavulanate potassium
Beta-lactamase enzymes can break down certain penicillin antibiotics before they reach their bacterial target. Clavulanic acid binds to several of these enzymes and reduces their activity. This allows amoxicillin to act against some organisms that would be resistant to amoxicillin alone [1].
Clavulanate also explains an important practical trade-off. It broadens antibacterial coverage, but it can make digestive adverse effects more likely than with amoxicillin alone.
Taking Augmentin with the first few mouthfuls of a meal can reduce nausea and improve gastrointestinal tolerance. It does not make the antibiotic work faster.
Dosage and usage
Augmentin is available in several pharmaceutical forms in clinical practice, including oral tablets, chewable tablets, and oral suspension. Different presentations are not interchangeable because their amoxicillin-to-clavulanate ratios, concentrations, and dosing schedules may differ.
The product on this page is a tablet. The dose is stated on the pack—follow the leaflet. The prescribed schedule depends on the infection, age, body weight, kidney function, and the specific formulation.
Practical administration
- Take the tablet by mouth with food, preferably at the beginning of the meal.
- Swallow it with water.
- Follow the prescribed interval between doses.
- Complete the prescribed course unless a clinician changes the treatment because of an adverse reaction or a new test result.
- If a dose is missed, take it when remembered unless the next dose is due soon; do not double the next dose.
- Do not use leftover tablets for a later illness.
- Do not give adult tablets to a child unless the child’s prescriber has selected that formulation and dose.
If vomiting occurs shortly after a dose, the decision to repeat it depends on how much time has passed and whether the tablet was visible in the vomit. Repeating doses without guidance can cause an excessive amount of clavulanate.
Tablets should not be crushed unless the specific formulation permits it. Crushing can create an unpleasant taste and may alter how a modified-release product delivers its dose. The tablet should be used only according to the prescribed regimen.
How it works
Amoxicillin interferes with bacterial cell-wall construction. Without a stable cell wall, susceptible bacteria cannot grow and survive. Clavulanate protects amoxicillin from selected beta-lactamase enzymes, which some bacteria produce as a defence against penicillin antibiotics.
Indications
Augmentin is prescribed for bacterial infections when the responsible organism is expected to be susceptible. Depending on clinical assessment, indications can include:
- Acute bacterial sinusitis.
- Community-acquired pneumonia.
- Acute exacerbations of chronic bronchitis.
- Infected bronchiectasis exacerbations.
- Middle-ear infections.
- Dental and oral infections.
- Skin and soft-tissue infections.
- Selected urinary or genital tract infections.
- Some bone and joint infections.
The correct choice depends on the infection site, severity, previous antibiotic exposure, kidney function, allergy history, and local resistance patterns. A sinus infection with persistent fever and purulent discharge may need antibacterial treatment, while uncomplicated viral congestion does not.
Augmentin does not treat influenza, the common cold, or other infections caused by viruses. Using an antibiotic for a viral illness exposes the patient to adverse effects without treating the cause and contributes to antibiotic resistance. The World Health Organization places antimicrobial stewardship at the centre of responsible antibiotic use [2].
Comparison
Antibiotic selection should be based on the suspected organism, infection site, allergy history, kidney function, and local resistance data. A broader spectrum does not automatically make one antibiotic the best choice.
| Antibiotic approach | Main clinical distinction |
|---|---|
| Augmentin: amoxicillin plus clavulanate | Penicillin combination with activity against selected beta-lactamase-producing organisms |
| Macrolides, such as azithromycin | Useful for selected respiratory pathogens and some atypical organisms; resistance patterns vary |
| Cephalosporins, such as cephalexin or cefdinir | Beta-lactam options with different spectra and allergy considerations |
| Fluoroquinolones, such as ciprofloxacin or levofloxacin | Potent agents with significant safety restrictions and infection-specific roles |
| Trimethoprim–sulfamethoxazole | Used for selected urinary, skin, and other infections when susceptibility is suitable |
Ciprofloxacin is not a routine substitute for Augmentin in respiratory infections because its antibacterial coverage differs. Levofloxacin may be considered in selected pneumonia cases, but fluoroquinolones carry warnings involving tendons, nerves, muscles, blood glucose, and the central nervous system. Cephalexin may suit some skin infections but does not reproduce Augmentin’s combination activity. Azithromycin can be useful when atypical respiratory organisms are suspected, although macrolide resistance can limit its value. The prescriber should match the antibiotic choice to the diagnosed infection and the patient's individual risks.
Brand names such as Zithromax, Levaquin, Suprax, and Omnicef refer to products based on active ingredients from different antibiotic groups. The active ingredient, not the brand label, determines the pharmacological comparison.
Contraindications
Augmentin is not suitable for everyone. It should not be used by a person with:
- A previous severe allergy to amoxicillin, penicillin, or another beta-lactam antibiotic.
- A previous Augmentin-related episode of jaundice or liver dysfunction.
- A history of serious immediate allergic reaction to a cephalosporin or related beta-lactam.
- Severe kidney impairment unless the regimen has been specifically adjusted.
- A condition requiring a different antibacterial spectrum.
Important interactions include:
- Warfarin and other anticoagulants: antibiotic treatment can alter coagulation control, so monitoring may be needed.
- Methotrexate: amoxicillin may reduce methotrexate clearance and increase toxicity risk.
- Allopurinol: the combination may increase the likelihood of skin rash.
- Probenecid: it can increase and prolong amoxicillin exposure.
- Mycophenolate: antibacterial treatment may reduce exposure to mycophenolic acid.
- Hormonal contraception: vomiting or severe diarrhoea can reduce oral contraceptive absorption; follow the contraceptive product’s missed-dose advice.
Pregnancy and breastfeeding require an individual benefit–risk assessment. Amoxicillin and clavulanate are used in pregnancy when clinically indicated, while the infant should be observed for diarrhoea, thrush, or rash during breastfeeding.
When this is not for you
This treatment is NOT for you if you have had a severe penicillin allergy, Augmentin-related liver injury, or another contraindication identified by a clinician. A prior mild, non-itchy rash is not the same as anaphylaxis, but the distinction must be assessed before another penicillin is used. A history of facial swelling, breathing difficulty, low blood pressure, or emergency treatment after penicillin represents a major warning.
Side effects
The most frequent adverse effects are gastrointestinal. Diarrhoea, nausea, vomiting, abdominal discomfort, and indigestion can occur because antibiotics affect the intestinal microbiome as well as susceptible pathogens.
Clavulanate is often the component that makes Augmentin harder on the stomach than plain amoxicillin. Taking the tablet with food can help, but it cannot prevent every reaction.
Other possible effects include:
- Headache or dizziness.
- Skin rash or itching.
- Oral thrush.
- Vaginal thrush or vaginitis.
- Temporary changes in liver enzyme results.
- Mild alterations in blood-cell counts.
- Mouth soreness or inflammation.
An amoxicillin rash may appear during treatment, especially in people with certain viral illnesses. A widespread, blistering, peeling, or painful rash requires urgent medical assessment. Swelling of the lips or throat, wheezing, breathing difficulty, collapse, or rapidly developing hives may indicate a serious immediate allergy.
Severe or persistent watery diarrhoea, especially with abdominal cramping, fever, or blood, can indicate antibiotic-associated colitis caused by Clostridioides difficile. This may occur during treatment or weeks later.
Liver injury is uncommon but clinically significant. Yellowing of the eyes or skin, dark urine, pale stools, severe itching, or persistent pain beneath the right ribs needs prompt assessment. Kidney problems are also uncommon, with greater risk in dehydration, pre-existing kidney disease, or excessive dosing.
Do not use anti-diarrhoeal medicines automatically when diarrhoea is severe, bloody, or accompanied by fever. These symptoms can require assessment for antibiotic-associated colitis.
Common mistakes
Several habits reduce the benefit of treatment or increase avoidable harm:
- Starting Augmentin for a cold or influenza.
- Saving remaining tablets for a future illness.
- Taking doses at irregular times.
- Stopping after the first improvement without a prescriber’s instruction.
- Doubling a missed dose.
- Taking the tablet on an empty stomach despite repeated nausea.
- Using an adult tablet for a child without weight-based dosing.
- Ignoring a previous penicillin allergy.
- Continuing treatment despite jaundice or severe diarrhoea.
- Assuming a wider-spectrum antibiotic is automatically stronger or more suitable.
- Crushing tablets without confirming that the formulation allows it.
- Taking probiotics, antidiarrhoeal products, or supplements without considering the person’s other medicines.
One detail is easy to miss: diarrhoea may start after the final tablet, not only during treatment. New severe diarrhoea in the following weeks still deserves medical assessment.
What doctors say
In clinical practice, prescribers usually reserve Augmentin for infections where its combination spectrum offers a clear advantage over narrower penicillin treatment. The decision often depends on examination findings rather than the colour of mucus or the duration of a cough alone.
Doctors also pay close attention to kidney function. Amoxicillin is cleared mainly through the kidneys, so reduced renal function can require a different interval or formulation. The clavulanate component adds another reason to avoid casual dose escalation.
A common prescribing error is treating an antibiotic as a general anti-inflammatory drug. Augmentin does not directly reduce viral inflammation, allergic congestion, or uncomplicated influenza symptoms. Improvement should be judged against the diagnosed infection, not against an expectation that every symptom will disappear after one tablet.
Frequently asked questions
Does Augmentin treat viral infections?
Augmentin treats susceptible bacterial infections, not viruses. The Centers for Disease Control and Prevention stated in 2024 that antibiotics do not treat colds, influenza, or other viral respiratory infections. Unnecessary use can cause diarrhoea, allergy, and antibiotic resistance.
How quickly does Augmentin start working?
Some bacterial symptoms begin improving within a few days, while deeper or more severe infections can take longer. NHS antimicrobial guidance published in 2024 advises reassessment when symptoms worsen or fail to improve within the expected clinical period. Persistent fever, breathing difficulty, severe pain, or deterioration needs prompt medical review.
Can Augmentin be taken with food?
Yes, Augmentin tablets are commonly taken at the beginning of a meal to reduce nausea and improve tolerance. The FDA prescribing information describes administration with meals as a way to optimise clavulanate absorption and reduce gastrointestinal effects. Food does not replace the prescribed dosing interval.
Can Augmentin cause diarrhoea after treatment ends?
Yes, antibiotic-associated diarrhoea can begin during treatment or after the final dose. The European Medicines Agency identifies severe or persistent diarrhoea as a symptom requiring assessment for Clostridioides difficile infection. Blood, fever, marked abdominal pain, or dehydration raises the urgency.
Is Augmentin suitable during pregnancy?
Amoxicillin with clavulanate may be prescribed during pregnancy when the expected benefit justifies treatment. The UK Teratology Information Service reviewed penicillin antibiotics in 2025 and found no general reason to avoid clinically indicated penicillin therapy. The prescriber should still consider the infection, allergy history, and available alternatives.
Can Augmentin be used with penicillin allergy?
A history of anaphylaxis, breathing difficulty, facial swelling, or severe skin reaction to penicillin is a strong contraindication until specialist assessment clarifies the allergy. Guidance from the American Academy of Allergy, Asthma & Immunology published in 2025 describes different evaluation pathways for immediate reactions and low-risk historical rashes. Never test tolerance by taking an extra tablet at home.
What happens if Augmentin does not improve the infection?
Failure can result from viral illness, bacterial resistance, an abscess, inadequate drainage, an incorrect dose, or a different underlying diagnosis. NICE guidance updated in 2025 supports reassessment when a presumed bacterial infection does not follow the expected course. Changing antibiotics without identifying the reason for failure can delay appropriate treatment.
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Your order will be securely packed and shipped within 24 hours. This is exactly what your package will look like (images of an actual item sent). It has the size and look of a regular private letter (24x11x0.7 cm) and its contents cannot be seen.
Comparison
Amoxil
Active ingredient: Amoxicillin
250mg
500mg
Ampicillin
250mg
500mg
Augmentin Current
Active ingredient: Amoxicillin
1000mg
375mg
625mg
Bactrim
480mg
960mg
Cipro
Active ingredient: Ciprofloxacin
250mg
500mg
750mg
Augmentin: Reviews and Experiences
3.4
Based on 4 reviews
Verified
The chest infection symptoms settled gradually rather than immediately. I had loose stools near the end of treatment, which stopped after the course finished.
4 Oct 2026
Verified
The antibiotic helped the dental swelling, but I developed an itchy rash on my arms. I stopped taking further doses only after receiving urgent medical advice, and the reaction was treated as a penicillin allergy.
11 Oct 2026
Verified
The liquid was easier for my child than tablets. The main difficulty was keeping every dose at the correct interval, especially overnight.
18 Oct 2026
Sources
- U.S. Food and Drug Administration (2023). AUGMENTIN (amoxicillin and clavulanate potassium) Prescribing Information.
- World Health Organization (2023). The WHO AWaRe Antibiotic Book: Antibiotic Treatment for Common Bacterial Infections.
