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Augmentin: Uses, dosage, side effects, warnings & patient reviews

Augmentin

Augmentin
augmentin 500/125 mg
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Augmentin

Amoxicillin and Clavulanate Potassium
Augmentin is a prescription antibiotic combining amoxicillin and clavulanate potassium. It is used to treat various bacterial infections, including sinusitis, pneumonia, and skin infections, by overcoming certain types of antibiotic resistance.
  • ActiveIngredient: Amoxicillin and Clavulanate Potassium
  • DosageForm: Oral Tablet, Chewable Tablet, & Powder for Oral Suspension
  • Dosage: Tablets: 250 mg/125 mg, 500 mg/125 mg, 875 mg/125 mg, 1000 mg/62.5 mg. Chewable Tablets: 200 mg/28.5 mg, 400 mg/57 mg. Suspension: 125 mg/31.25 mg, 200 mg/28.5 mg, 250 mg/62.5 mg, 400 mg/57 mg per 5 mL. Augmentin ES-600: 600 mg/42.9 mg per 5 mL.
  • Indications: Treatment of lower respiratory tract infections, otitis media, sinusitis, skin and skin structure infections, and urinary tract infections caused by susceptible beta-lactamase-producing strains.
  • Manufacturer: GSK (GlaxoSmithKline) / Various Generics
  • Storage: Tablets: Store at or below 25°C (77°F) in a dry place. Suspension (Reconstituted): Must be refrigerated (2°C to 8°C) and discarded after 10 days.
  • Drug Status: Prescription Only
Description

What is Augmentin (Amoxicillin Clavulanate)?

Augmentin is a broad-spectrum, prescription-only antibiotic. It belongs to the penicillin class of antibiotics and contains two active ingredients: amoxicillin and clavulanate potassium (clavulanic acid).

This combination is the key to its effectiveness. Amoxicillin, the primary antibiotic component (also found in Amoxil), works by killing susceptible bacteria. Clavulanic acid protects amoxicillin from being destroyed by bacterial enzymes (beta-lactamases) that would normally cause resistance. This makes Augmentin effective against a wider range of bacteria than amoxicillin alone.

The medication is available in immediate-release tablets (e.g., Augmentin 500/125 mg, 875/125 mg), extended-release tablets (Augmentin XR 1000/62.5 mg), and oral suspensions for children.

General Instructions

How to Take Augmentin

Following administration instructions precisely is crucial for effectiveness and to minimize gastrointestinal side effects, which are common with this medication.

Administration

Swallow tablets whole with a full glass of water at the start of a meal. Taking it with food helps reduce the risk of stomach upset and improves the absorption of clavulanic acid. Do not crush or chew the tablets, especially the extended-release (XR) formulation.

If you are prescribed the oral suspension, shake the bottle vigorously for at least 10 seconds before each use. Use the provided measuring spoon or syringe to ensure an accurate dose; do not use a household teaspoon.

Course Completion

It is critical to complete the entire prescribed course of antibiotics, even if you start to feel better after a few days. Stopping treatment early can lead to a resurgence of the infection and contribute to antibiotic resistance. For more on the importance of this, see our guide on responsible antibiotic use.

Missed Dose

If you miss a dose, take it as soon as you remember with food. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose to make up for a missed one. Keeping track of doses is important; consider using tools mentioned in our article on understanding medication information.

Side Effects

Side Effects of Augmentin

As with all medications, Augmentin can cause side effects. Gastrointestinal issues are the most common due to the clavulanic acid component.

Common and Serious Side Effects of Augmentin
FrequencySide EffectsAction to Take
Very Common (>10%)
  • Diarrhea (may be mild or severe; for more, see acute diarrhea)
  • Nausea, vomiting
  • Indigestion, abdominal pain
  • Vaginal yeast infection (candidiasis)
Taking with food can help. For persistent diarrhea, consult your doctor. Probiotics like Lactinex may be recommended during treatment. For yeast infections, antifungals like Diflucan may be needed.
Serious (Seek Medical Help)
  • Severe, watery, or bloody diarrhea (may indicate C. difficile colitis)
  • Yellowing of skin/eyes (jaundice), dark urine, persistent nausea (signs of liver problems)
  • Skin rash, hives, itching, swelling of the face/lips/tongue, difficulty breathing (signs of allergy)
  • Unusual bruising or bleeding
  • Severe skin reaction with blistering or peeling
Stop taking Augmentin and contact your doctor immediately or seek emergency care. These may indicate a serious reaction requiring prompt medical evaluation.
Uses

What is Augmentin Used For?

Augmentin is prescribed for bacterial infections caused by organisms that are susceptible to the amoxicillin/clavulanate combination. It is particularly useful for infections where resistance to amoxicillin alone is suspected or proven.

Primary Medical Uses

  • Respiratory Tract Infections: Such as acute bacterial sinusitis, pneumonia, otitis media (ear infection), and exacerbations of chronic bronchitis.
  • Skin and Soft Tissue Infections: Including cellulitis, animal bites, and postoperative wound infections.
  • Urinary Tract Infections (UTIs): Complicated and uncomplicated infections. Learn more about UTIs.
  • Other Infections: Dental infections, bone and joint infections.

Important Limitations

Augmentin is only effective against bacterial infections. It has no activity against viral infections such as the common cold, influenza, or most sore throats. Misuse for viral illnesses contributes to antibiotic resistance and exposes patients to unnecessary side effects.

Safety advice

Interactions Alcohol:

Use with caution
While alcohol does not directly reduce Augmentin's effectiveness, it can worsen certain side effects like stomach upset and nausea. It may also place additional stress on the liver. It is generally advisable to avoid or limit alcohol consumption during treatment.

Interactions Other Medications:

Consult your doctor
Augmentin can interact with several drugs. It may reduce the effectiveness of oral contraceptives; use a backup method. It can also interact with blood thinners like warfarin (increasing bleeding risk) and drugs like methotrexate (increasing its toxicity). Always provide your doctor with a complete medication list.

Special Groups Pregnancy:

Safe if prescribed
Augmentin is generally considered safe for use during pregnancy when clearly needed and prescribed by a doctor. The benefits of treating a serious bacterial infection typically outweigh potential risks.

Special Groups Breastfeeding:

Use with caution
Small amounts of amoxicillin and clavulanate pass into breast milk. While it is usually considered compatible with breastfeeding, it may cause diarrhea or thrush in the infant. Monitor the baby for any side effects.

Special Groups Elderly:

Use with caution
Elderly patients may be more prone to side effects, particularly diarrhea. Age-related decline in kidney function may also require dosage adjustment. Regular monitoring is advisable.

Special Groups Children:

Safe if prescribed
Augmentin is commonly prescribed to children in liquid suspension form for infections like ear infections and strep throat. Dosing is based on weight. For guidance, see this parent's guide. Always use the measuring device provided to avoid accidental overdose.

Effects on Activities Driving:

Safe if prescribed
Augmentin typically does not cause drowsiness or impair driving. However, if you experience dizziness as a side effect, refrain from driving until it resolves.

Effects on Activities Operating Machinery:

Safe if prescribed
Similar to driving, operating machinery is generally safe unless you experience dizziness or other side effects that could impair coordination or alertness.
Concerns

Important Safety Concerns and Considerations

Gastrointestinal Disturbances (Diarrhea)

Diarrhea is the most frequently reported side effect of Augmentin, largely due to the clavulanic acid component. It can range from mild to severe. In some cases, antibiotic use can lead to an overgrowth of Clostridioides difficile bacteria, causing severe, watery, and bloody diarrhea (pseudomembranous colitis). This condition requires immediate medical attention.

Hepatotoxicity (Liver Injury)

Augmentin has been associated with a risk of liver injury, including cholestatic jaundice and hepatitis. This risk is higher with prolonged use (over 10-14 days) and in elderly patients. Symptoms include yellowing of the skin or eyes (jaundice), dark urine, persistent nausea, and upper abdominal pain. Liver function usually returns to normal after stopping the medication, but monitoring is important.

Allergic Reactions

As a penicillin-class antibiotic, Augmentin can cause allergic reactions in susceptible individuals. These can range from mild skin rashes to severe, life-threatening anaphylaxis. Inform your doctor immediately of any history of penicillin, cephalosporin, or other drug allergies.

Impact on Gut and Vaginal Flora

Like all broad-spectrum antibiotics, Augmentin can disrupt the normal balance of bacteria in the gut and vagina. This increases the risk of antibiotic-associated diarrhea and vaginal yeast infections (candidiasis). Taking probiotics during and after the course may help restore balance.

Warnings

Critical Warnings for Augmentin Use

Hepatitis and Cholestatic Jaundice

Augmentin use has been associated with drug-induced hepatitis, which may be severe. It is relatively more common with Augmentin than with amoxicillin alone. The onset may occur during or several weeks after therapy has stopped. Patients with a history of liver dysfunction or those receiving treatment for longer than the recommended duration are at increased risk. Therapy should be discontinued if signs of liver injury appear.

Clostridioides difficile-Associated Diarrhea (CDAD)

Antibiotic use, including Augmentin, can cause CDAD, which may range in severity from mild diarrhea to fatal colitis. CDAD can occur over two months after the last antibiotic dose. If significant diarrhea, abdominal cramps, or bloody stools develop, discontinue Augmentin and initiate appropriate diagnostic tests and treatment.

Penicillin Allergy

Do not use Augmentin if you have a known severe allergy (e.g., anaphylaxis) to any penicillin-class antibiotic. There is also a potential for cross-reactivity with cephalosporin antibiotics in individuals with a history of severe penicillin allergy.

Mononucleosis-Associated Rash

Patients with mononucleosis (often caused by Epstein-Barr virus) who are prescribed amoxicillin-class antibiotics frequently develop a non-allergic skin rash. Therefore, Augmentin should not be administered to patients with mononucleosis.

Important Dosing Clarifications

  • Augmentin XR Tablets: The extended-release formulation (Augmentin XR 1000 mg) is not interchangeable with regular Augmentin tablets. It contains a different ratio of amoxicillin to clavulanate (1000/62.5 mg) and is dosed twice daily for specific indications.
  • Ratio Confusion: It is critical to understand that two 250 mg tablets (each containing 250 mg amoxicillin/125 mg clavulanate) are NOT equivalent to one 500 mg tablet (containing 500 mg amoxicillin/125 mg clavulanate). Taking two 250 mg tablets results in a double dose of clavulanic acid (250 mg vs. 125 mg), significantly increasing the risk of gastrointestinal side effects, particularly diarrhea. Always take the exact tablet strength prescribed.
Dosage

Augmentin Dosage Information

Dosage is determined by the type and severity of the infection, the patient’s age, weight, and kidney function. Always follow your doctor’s specific prescription. The notations (e.g., 875/125) refer to the milligrams (mg) of amoxicillin and clavulanate potassium, respectively.

General Augmentin (Amoxicillin/Clavulanate) Dosage Guidelines
Formulation & StrengthStandard Adult DosageKey Indications & Notes
Standard Release Tablets
(e.g., 250/125 mg, 500/125 mg, 875/125 mg)		One tablet every 8 or 12 hours.
Common regimens: 500/125 mg every 12 hours or 875/125 mg every 12 hours for more severe infections.		Used for sinusitis, pneumonia, skin infections, UTIs. Duration is typically 5-14 days depending on infection.
Augmentin XR Tablets
(1000/62.5 mg)		Two tablets (total 2000/125 mg) every 12 hours.Specifically approved for adults with recurrent or persistent acute bacterial sinusitis or community-acquired pneumonia. Not for children. Swallow whole; do not crush or chew.
Oral Suspension (Pediatric)Dosed based on child’s weight (mg of amoxicillin per kg of body weight) and infection severity, typically every 8 or 12 hours.Common for ear infections, sinusitis, pneumonia in children. Always use the measuring device provided.

Important Administration Notes

  • Renal Impairment: Dosage adjustment or increased dosing interval is required for patients with significant kidney disease (creatinine clearance < 30 mL/min).
  • Hepatic Impairment: Use with caution; regular monitoring of liver function is recommended.
  • Maximum Daily Dose of Clavulanate: To minimize the risk of liver toxicity, the total daily dose of clavulanic acid (as the potassium salt) should generally not exceed 125 mg every 8 hours or 250 mg every 12 hours in adults.
Interactions

Drug Interactions with Augmentin

Inform your doctor about all medications, supplements, and herbal products you are taking.

Significant Drug Interactions with Augmentin
Interacting SubstanceEffect of InteractionRecommendation
ProbenecidDecreases the renal excretion of amoxicillin, leading to increased and prolonged blood levels of the antibiotic.Co-administration is not recommended. If used together, monitor for increased Augmentin side effects.
Oral ContraceptivesAntibiotics may reduce the effectiveness of estrogen-containing birth control pills, potentially leading to unintended pregnancy.Use an additional non-hormonal form of contraception (e.g., condoms) during and for 7 days after the antibiotic course.
Warfarin and Other AnticoagulantsAugmentin may potentiate the anticoagulant effect, increasing the risk of bleeding and bruising.Close monitoring of prothrombin time (INR) is essential. Report any unusual bleeding.
MethotrexateConcomitant use can decrease the clearance of methotrexate, leading to increased toxicity and risk of side effects.Frequent monitoring of methotrexate levels and for signs of toxicity (e.g., mouth sores, low blood counts) is required.
AllopurinolCo-administration may increase the incidence of skin rash.Monitor for skin reactions. The significance of this interaction is debated but noted in prescribing information.

FAQs

Augmentin contains amoxicillin plus clavulanic acid. Clavulanic acid inhibits bacterial enzymes that would otherwise destroy amoxicillin. This makes Augmentin effective against a broader range of bacteria, including many that are resistant to amoxicillin alone. However, the addition of clavulanate also increases the risk of side effects like diarrhea and liver issues.
Diarrhea is a very common side effect, primarily due to the clavulanic acid component. It works by affecting the normal bacteria in your gut. Taking the medication with food can help reduce stomach upset. If you develop severe, watery, or bloody diarrhea, stop taking Augmentin and contact your doctor immediately, as it could be a sign of a serious intestinal condition.
It is not recommended. While alcohol won't stop the antibiotic from working, it can worsen common side effects like stomach upset and nausea. Since both alcohol and Augmentin can potentially stress the liver, it's best to avoid alcohol for the duration of your treatment.
No. Augmentin is a penicillin-class antibiotic. If you have a known allergy to penicillin or amoxicillin, you should not take Augmentin, as it can trigger a similar allergic reaction. Always inform your doctor of any drug allergies before starting a new prescription.
You may start to feel better within 2 to 3 days of starting treatment. However, it is crucial to finish the entire prescribed course of antibiotics, even if symptoms improve earlier. Stopping early can allow the infection to return and contribute to antibiotic resistance.
Other Details

Additional Information

Storage and Handling

Store tablets at room temperature (20°C to 25°C or 68°F to 77°F) in a tightly closed container, away from moisture. Store reconstituted oral suspension in a refrigerator (2°C to 8°C or 36°F to 46°F) and discard any unused portion after 10 days. Keep all medications out of the reach of children and pets.

What to Do in Case of Overdose

In case of suspected overdose, contact a poison control center or emergency room immediately. Symptoms of overdose may include severe stomach pain, vomiting, diarrhea, and agitation. Treatment is supportive; Augmentin can be removed from circulation by hemodialysis.

Obtaining Medication Safely

Augmentin is a prescription-only medication. It should only be obtained with a valid prescription from a licensed healthcare provider who has evaluated your condition. This ensures you receive the correct dosage and formulation for your specific infection.

References

References and Medical Sources

  1. U.S. Food and Drug Administration (FDA). Augmentin (amoxicillin/clavulanate potassium) Prescribing Information. [Revised 2023]. https://www.accessdata.fda.gov/drugsatfda_docs/label/2024/050564s060,050575s051,050597s052,050720s037,050725s036,050726s027lbl.pdf
  2. MedlinePlus. Amoxicillin and Clavulanic Acid. U.S. National Library of Medicine; [Updated 2023]. https://medlineplus.gov/druginfo/meds/a685024.html
  3. Drugs.com. Amoxicillin / Clavulanate Professional Monograph. Drugs.com; [Updated 2024]. https://www.drugs.com/monograph/amoxicillin-clavulanate.html
  4. World Health Organization (WHO). AWaRe Classification of Antibiotics. https://www.who.int/publications/i/item/WHO-MHP-HPS-EML-2023.04
Disclaimer

Disclaimer: The information on this site is provided for informational purposes only and is not medical advice. It does not replace professional medical consultation, diagnosis, or treatment. Do not self-medicate based on the information presented on this site. Always consult with a doctor or other qualified healthcare professional before making any decisions about your health.

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