Amoksiklav

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Amoksiklav

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Amoksiklav

What is Amoksiklav? Defining the Fixed-Dose Combination

Property Description
Active ingredients Amoxicillin and Clavulanic acid
Form Tablet, Suspension, Powder for Injection
Pharmacological class Penicillin-class antibacterial drug
General purpose Anti-infective agent for bacterial diseases
Origin Semi-synthetic

Amoksiklav: Identity and Pharmacological Class

Amoksiklav is a globally recognized Fixed-Dose Combination (FDC) antimicrobial preparation, fundamentally classified as a broad-spectrum antibiotic that belongs to the penicillin class of antibacterial drugs. This medicine is intended for systemic use against bacterial infections and is classified as a prescription-only medicine (POM). As a semi-synthetic compound, its core structure is derived from the basic penicillin nucleus and is not naturally occurring. The combination of Amoxicillin and Clavulanic acid is clinically recognized for its efficacy in managing infections where resistance to standard penicillins is a concern. This specific combination is categorized as an Essential Medicine.

Core Composition and Key Differentiation

The medication is composed of two primary active ingredients [INN]: Amoxicillin and Clavulanic acid. Amoxicillin acts as the main antibacterial agent, while Clavulanic acid is the crucial adjunct, specifically functioning as a beta-lactamase inhibitor. This combination creates a powerful synergistic action that differentiates it from plain amoxicillin formulations. The clavulanate component effectively protects the amoxicillin from degradation by bacterial enzymes. This means the medicine remains functional against many bacteria that have developed resistance to the single-agent antibiotic. The product is available in various dosage forms, including the film-coated tablet and powder for injection/infusion, permitting both oral and intravenous administration. This versatility allows its use across different patient settings and degrees of infection severity.

What side effects are possible with Amoksiklav?

Possible Side Effects and Safety Information

The safety profile for Amoxicillin/Clavulanic acid is structured around potential adverse reactions officially documented in regulatory labeling. The most frequently reported adverse effects in clinical trials are categorized as common, primarily affecting the gastrointestinal system.

Officially Classified Adverse Reactions

The most common adverse reactions reported include diarrhea (the most frequent effect), nausea, vomiting, and skin rashes or urticaria (hives). These classifications align with the frequency framework used by regulatory authorities to communicate expected incidence.

System-Organ Class Affected (SOC) Key Adverse Reactions (Common)
Gastrointestinal Disorders Diarrhea, Nausea, Vomiting
Skin and Immune System Rash, Urticaria
Infections Vaginitis, Microbial Overgrowth (Superinfection)

Serious Safety Concerns and Restrictions

Official prescribing information highlights the potential for serious adverse reactions that are potentially life-threatening. These include Anaphylactic Reactions, which are a risk for all penicillin-class antibiotics, and severe Hepatic Dysfunction (hepatitis or cholestatic jaundice). The official label notes that Convulsions may occur, particularly in individuals with existing renal impairment or those receiving higher doses.

Safety constraints strictly limit use in certain conditions. The medicine is formally contraindicated in patients with a history of serious immediate hypersensitivity to any penicillin or a history of cholestatic jaundice or liver problems associated with previous use of this drug combination. Population-specific safety considerations are noted, such as the required monitoring of liver function in patients with hepatic impairment and caution in patients with renal impairment. Additionally, the risk of Clostridioides difficile-associated diarrhea (CDAD) is noted in regulatory documents, which may manifest during treatment or up to two months following cessation of antibacterial therapy.

Overdose and Emergency Response

Overdose Map: Overdose and when to seek help — Official Regulatory Information for Amoksiklav

Overdose scope

Feature Official Regulatory Statement
Documented overdose presentations Gastrointestinal effects (diarrhea, stomach pain), sleepiness, and urinary changes, including decreased output, cloudy, or bloody urine.
Physiological systems affected (as stated in label) Renal, Hepatic, Central Nervous System, and Gastrointestinal System.
Dose-related or exposure-related factors (if applicable) High doses are associated with an increased risk of convulsions. Reduced urine output is linked to the risk of amoxicillin crystalluria.
Population-specific overdose notes (if applicable) Patients with impaired renal function have an increased risk of severe manifestations, particularly convulsions. Hepatic events are frequently reported in elderly patients.
Emergency-response statements (as written in official documents) Contact emergency services immediately if the individual collapses, has a seizure, experiences trouble breathing, or cannot be awakened. Contact the national poison control service.
When immediate medical help is required (label-derived phrasing only) Urgent medical attention is required when severe neurological or respiratory manifestations occur.

Overdose classifications (high-level)

Classification Official Regulatory Statement
Severity classification (as defined in official documents) Severity is defined by the occurrence of CNS effects (convulsions) and renal complications (crystalluria).
Regulatory basis (EMA / FDA / etc.) Based on the EMA Summary of Product Characteristics and FDA Prescribing Information.
Overdose-context constraints (as defined in official documents) No specific antidote is known. Management requires specific supportive measures to ensure adequate fluid intake and urinary output.

Resulting overdose structure

Official overdose statements:

  • Overdose may present with common gastrointestinal symptoms but the severe documented risks include convulsions and the potential for amoxicillin crystalluria.
  • Convulsions are officially stated to be more likely in patients with impaired renal function or following administration of high doses.
  • Management requires symptomatic and supportive treatment, including procedures like haemodialysis to assist in drug removal.

Connection to the overall overdose profile (2–4 sentences): The regulatory documentation defines the overdose profile by identifying specific acute manifestations while emphasizing the critical, documented risk of crystalluria and CNS effects. This risk assessment dictates the required emergency-seeking conditions, which mandate immediate contact with emergency services for severe neurological or respiratory events. Supportive measures are officially described to mitigate the toxic effects, particularly those affecting the renal system.

Therapeutic Uses of Amoksiklav

What Amoksiklav Treats: Main Uses and Benefits

The primary role of Amoxicillin/Clavulanic acid is to provide anti-infective support in conditions caused by susceptible bacteria, particularly when there may be a risk of resistance to standard penicillins. It is commonly used across various clinical settings marked by acute or disruptive symptom patterns.

The medication is generally applied to bacterial infections affecting the lungs, sinuses, and middle ear, including Lower Respiratory Tract Infections, Acute Bacterial Rhinosinusitis, and Acute Otitis Media. It is also relevant for severe skin and soft tissue conditions like cellulitis and infected bite wounds, infections of the urinary tract (such as Pyelonephritis), and odontogenic issues. The treatment generally supports the patient during symptomatic periods and contributes to easing the overall symptom load.

The use of the agent is relevant in clinical settings marked by increased discomfort or tension, and may help patients cope more steadily with symptom fluctuations.

Management of Acute Symptom Domains

This medication is used for managing symptom clusters that may become intense or disruptive, in situations where patients experience systemic imbalance, localized inflammatory states, or purulent discharge. The use of this agent may provide supportive relief that assists patients with maintaining functional stability during difficult acute episodes. Applied across domains where additional symptomatic support is needed, it is considered relevant for conditions that present with disruptive symptom manifestations.

Quick Fact: Support for Inflammatory Symptoms
Helps manage symptoms related to physical discomfort, fever, and swelling associated with bacterial infections, assisting with maintaining functional stability.

Regulatory References

  1. NIH DailyMed Label for Amoxicillin and Clavulanate Potassium

Eligibility and Restrictions for Use

Eligibility Scope

Category Official Regulatory Statement (Strictly Label-Based)
Populations for whom use is allowed Adults, adolescents, and children (ge 3 months) are eligible under standard labeled conditions, provided no contraindications exist. Older adults are generally eligible, but use should consider age-related decline in renal function.
Populations for whom use is contraindicated Patients with a known history of hypersensitivity to Amoksiklav, any penicillin, or other beta-lactam drugs. Patients with a previous history of cholestatic jaundice or hepatic dysfunction associated with this specific drug combination.
Age-related eligibility rules Use is not fully established or is highly restricted in infants younger than 3 months (12 weeks).
Condition-specific eligibility rules Patients with severe renal impairment ( CrCl < 30 mL/min) are restricted from using certain high-strength doses. Use requires monitoring in patients with pre-existing hepatic impairment.
Populations for whom use is not recommended Use is not recommended in patients with infectious mononucleosis due to the high risk of developing a non-allergic skin rash.

Connection to the Overall Eligibility Profile:

Official regulatory documents define non-eligibility through absolute prohibitions based on past allergic reactions or specific prior drug-induced liver damage. For all other populations, including pediatric patients and those with organ impairment, eligibility is made conditional upon age thresholds and existing organ function, which must be assessed against the constraints written in the prescribing information.

What should I know about interactions with other medicines?

Officially documented interaction patterns for the Amoxicillin/Clavulanic acid combination primarily involve the modification of drug exposure and specific pharmacodynamic effects, as described in regulatory documents. These interaction effects dictate restrictions for certain co-administered medicinal products.

Interacting Substance Official Interaction Pattern Regulatory Implication
Probenecid This substance decreases the renal tubular secretion of Amoxicillin. Results in increased and prolonged blood concentrations of Amoxicillin.
Oral Anticoagulants Co-administration may be associated with an abnormal prolongation of prothrombin time (INR). Laboratory monitoring of coagulation parameters is recommended.
Methotrexate May elevate serum concentrations of Methotrexate due to competition for renal tubular secretion. Increases the body's exposure to Methotrexate.
Allopurinol Concurrent administration increases the incidence of skin rashes. The risk of adverse skin reactions is officially heightened.
Food Enhances the absorption of the clavulanate component. Administration is optimized when taken at the start of a meal.

Interactions with combined oral contraceptives have been documented to potentially lead to reduced efficacy. Furthermore, regulatory labeling generally advises against use in patients with suspected or confirmed infectious mononucleosis due to a high risk of developing a skin rash, a specific population-based interaction note. The combined interaction profile highlights constraints related to renal clearance competition and effects on coagulation parameters.

Mechanism of Action

Amoksiklav employs a dual-action mechanism, combining the beta-lactam antibiotic amoxicillin with clavulanic acid, a beta-lactamase inhibitor. Amoxicillin acts by binding to and inhibiting bacterial enzymes known as transpeptidases (or penicillin-binding proteins, PBPs). These enzymes are crucial for the cross-linking of peptidoglycan units during bacterial cell wall synthesis. This inhibition involves the covalent modification and irreversible disruption of the peptidoglycan layer, compromising the structural integrity of the cell wall.

Clavulanic acid, a mechanism-based inhibitor, acts as a suicide substrate by irreversibly binding to and neutralizing beta-lactamase enzymes produced by resistant bacteria. This protective action prevents the hydrolytic cleavage of the amoxicillin molecule. The resulting synergy enables amoxicillin to maintain its inhibitory activity against transpeptidases in beta-lactamase-producing organisms, leading to bacteriolysis and cessation of microbial proliferation.

Dosage and Administration Information

Official Administration Guidelines

Amoksiklav (Amoxicillin/Clavulanate Potassium) must be used strictly according to the prescribed instructions for administration and dosing. The medication is available for oral use (tablets, chewable tablets, and oral suspension) and intravenous (IV) use (powder for injection/infusion).

Administration Timing and Handling:

To optimize the absorption of clavulanate and minimize potential gastrointestinal intolerance, all oral forms should be taken at the start of a meal. Specific forms require distinct handling:

  • Extended-Release Tablets: Must be swallowed whole; they must not be crushed, broken, or chewed.
  • Oral Suspension: The powder must be reconstituted by adding the specified amount of water and shaking vigorously; the suspension must be shaken well before each use.

Standard Dosing and Frequency:

The treatment course should generally not exceed 14 days without clinical review. Dosing is based on the amoxicillin component and typically administered:

  • Adults (>= 40 kg): Common oral regimens are 875 mg/125 mg every 12 hours or 500 mg/125 mg every 8 hours.
  • Pediatric Patients (< 40 kg): Dosing is weight-based (mg/kg/day) and divided, often into a twice-daily (q12h) or three-times-daily (q8h) regimen, depending on the chosen strength.

Population-Specific Adjustments:

Patients with severe renal impairment (creatinine clearance < 30 mL/min) require mandatory dosage adjustment. The 875 mg/125 mg oral tablet is not recommended in patients with CrCl <= 30 mL/min. Hemodialysis patients require a supplemental dose administered during and at the end of the dialysis session to maintain drug levels.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Amoksiklav


Evidence for Use in Lower Respiratory Tract Infections and Sinusitis

The research landscape for this combination in conditions like Community-Acquired Pneumonia (CAP) and Acute Bacterial Rhinosinusitis (ABRS) includes Randomized Controlled Trials (RCTs) and systematic reviews. These studies were conducted during periods of increased symptom activity and examined outcomes related to systemic or functional measures. For ABRS, studies often monitored clinical findings, focusing on the evolution of symptoms and the need for alternative therapy. Research for LRTI, including Acute Exacerbations of COPD (AECB), also explored metrics of clinical change and documented rates of non-response to therapy.

The findings describe patterns observed in the studies regarding the achievement of pre-defined outcome metrics. Comparative evidence is lacking regarding the drug's performance against plain amoxicillin in settings where bacterial resistance to single-agent penicillin is documented as low. Research notes that the study design required specific methods to differentiate likely bacterial infections from viral cases, which may influence the interpretation of results.


Evidence for Use in Acute Otitis Media and Pediatric Populations

The evidence base for Acute Otitis Media (AOM) in children and infants was evaluated in specialized pediatric clinical trials and RCTs. These studies examined outcomes related to physical discomfort and outcomes capturing phases of heightened symptom activity. Researchers monitored final therapeutic findings, the microbiological pathogen clearance, and the time required for symptom changes.

The findings describe patterns observed in the studies regarding microbiological outcome measurements and pre-defined criteria for clinical response in children. Research highlights the constraint that studies required specialized drug formulations to maintain the tested amoxicillin-to-clavulanic acid ratio in younger patient groups. Additionally, data are still emerging regarding recurrence or long-term outcomes across all pediatric age subgroups.


Evidence for Use in Skin, Soft Tissue, and Urinary Tract Infections

For conditions such as complicated skin and soft tissue infections (including infected bite wounds) and certain Urinary Tract Infections (UTIs), the evidence was studied for primarily through clinical trials, observational cohort studies, and microbiological surveillance. Trials report measurements of pre-defined outcome metrics relative to standard care. The evidence base describes patterns observed in populations with complex or polymicrobial infections.

Evidence is limited for specific infection sub-types. For UTIs, the research focus is limited to infections caused by organisms confirmed or suspected to be beta-lactamase producers, which affects its relevance to other susceptible-only infections. Long-term effects are not fully established, and evidence for maintenance or extended-duration data remains scarce across the major indications.


Research in Specific Patient Groups and Remaining Uncertainty

Research was evaluated in specific patient groups that include pediatric patients, older adults, and individuals with certain comorbid conditions. The study populations were often stratified by age or disease severity. The results apply only to the populations studied, and the follow-up durations were limited.

Data for certain groups remain insufficient, particularly for pregnant populations or those with specific organ dysfunction. The research emphasizes that a key constraint in the studies was the requirement for infections to be caused by a beta-lactamase-producing bacterium, rather than a susceptible strain. The evidence highlights what is known — and what is still uncertain — about the research findings outside of the controlled conditions under which the studies were conducted.

Key Studies & References

  1. Amoxicillin and Clavulanate Potassium Tablet, Coated

Frequently Asked Questions (FAQ)

Common questions about Amoksiklav (FAQ)


Q: Is Amoksiklav effective for treating viral infections like the common cold or flu?

Amoksiklav is classified as a penicillin-class antibacterial drug and is approved to treat specific infections caused by bacteria. According to official product information, it is not indicated or effective for use against infections caused by viruses, such as the common cold or influenza (flu).


Q: What kind of skin rash might be a sign of a serious reaction to Amoksiklav?

Official warnings describe the potential for rare but serious skin reactions, including conditions like Stevens-Johnson syndrome (SJS) and DRESS. These reactions may begin with fever and flu-like symptoms, followed by a rash that can progress to blistering or peeling skin. A widespread rash accompanied by facial swelling or enlarged lymph nodes is described as a potential sign of a serious reaction.


Q: Can Amoksiklav cause dizziness or affect driving?

Regulatory documents list central nervous system effects, including dizziness and, in rare instances, convulsions, among the reported adverse reactions. The potential for these effects suggests caution may be warranted before operating machinery or driving.


Q: Is it acceptable to stop taking the medicine if I feel better before the course is finished?

Official patient information describes that the medicine should be taken for the full duration prescribed by a healthcare provider. Stopping treatment early, even if symptoms have improved, may result in the infection not being fully cleared, which can contribute to the development of bacterial resistance.


Q: Does Amoksiklav come in different strengths or formulations?

Yes, Amoksiklav is available in several forms, including film-coated tablets, chewable tablets, oral suspension, and powder for injection. These forms are supplied in multiple different strengths that vary in the ratio of the active ingredients, amoxicillin and clavulanic acid.


Q: What should be done if a dose of Amoksiklav is forgotten?

Regulatory guidance describes that if a dose is missed, it should generally be taken as soon as it is remembered. However, to maintain the proper time interval and avoid taking too much, the missed dose should be skipped entirely if it is almost time for your next scheduled dose.


Q: Can Amoksiklav tablets be cut in half or crushed for easier swallowing?

Official administration instructions specify that extended-release tablets must be swallowed whole and should not be crushed, broken, or chewed. Standard tablets are described as generally being intended to be swallowed whole, unless the specific formulation label indicates that it is designed to be chewed or scored.


Q: What are the consequences of taking too much Amoksiklav?

Reported symptoms of overdosage may include stomach upset, diarrhea, and excessive sleepiness. In patients with pre-existing kidney problems or those taking high doses, serious adverse effects like convulsions (seizures) have been reported.


Q: Are there risks of liver problems or jaundice associated with Amoksiklav use?

Yes, regulatory documentation highlights the potential for serious hepatic dysfunction (liver injury), including hepatitis and cholestatic jaundice (a type of yellowing of the skin or eyes). This injury may be delayed, sometimes developing several weeks after the full treatment course has been completed.


Q: Can Amoksiklav be taken with alcohol?

Official drug labels do not list alcohol as a direct pharmacological interaction that requires a formal prohibition. However, consumption of alcohol may worsen common side effects like nausea, vomiting, or dizziness, and may interfere with the body’s ability to recover from the underlying infection.


Q: Are there known interactions between Amoksiklav and herbal supplements or vitamins?

The official documentation does not specifically list interactions with most herbal products or vitamins. Official product information suggests that patients discuss all co-administered products with their healthcare provider or pharmacist, as supplements are not tested to the same regulatory standard as prescription medicines.


Q: Can Amoksiklav be used safely during pregnancy, and what does the evidence indicate?

Amoksiklav is classified by the FDA as Pregnancy Category B, indicating that animal reproduction studies have not demonstrated a risk to the fetus. However, official information indicates that use during pregnancy is advised only when a medical professional determines it is clearly needed, as adequate studies in pregnant women are not available.


Q: Does Amoksiklav pass into breast milk, and what is the potential effect on a nursing infant?

Official resources indicate that the amoxicillin component is excreted into breast milk in small quantities, though the clavulanate component has generally not been detected. Official resources suggest that the infant may need to be monitored for potential adverse effects such as rash, diarrhea, or fungal infections (candidiasis).


Q: Does the medicine cause temporary changes in tooth color?

Temporary tooth discoloration, typically appearing as a brown, yellow, or grey staining of the teeth, has been reported with this medication. This effect is seen most often with the oral suspension form, but it is usually reversible with regular brushing or a professional dental cleaning.


Q: Is 'black hairy tongue' a known side effect of Amoksiklav?

Yes, a condition known as 'black hairy tongue' (lingua villosa nigra) has been reported in post-marketing surveillance for the amoxicillin/clavulanate combination. This condition, where the tongue appears dark and furry, is temporary and usually resolves after stopping the medication.


Q: What is antibiotic-associated colitis and is it related to Amoksiklav?

Antibiotic-associated colitis is a condition officially noted in the drug’s regulatory documents. This inflammation of the large intestine, which includes the more severe Clostridioides difficile-associated diarrhea (CDAD), can occur during treatment or even up to two months after antibacterial therapy has been completed.


Q: Is Amoksiklav safe to use for longer than two weeks?

Official prescribing information establishes a recommended maximum duration of 14 days for a single course of treatment without clinical review. Extended use beyond this duration may be required for some infections but is limited to use under strict medical supervision.

How should Amoksiklav be stored and disposed of?

How to Store and Dispose of Amoksiklav (Amoxicillin/Clavulanate Potassium)

The storage of Amoksiklav is specific to its formulation to ensure stability. Tablets and dry powder must be stored at Controlled Room Temperature (below 25 C or 77 F) in the original, tightly closed container to protect from moisture. The reconstituted liquid suspension must be stored refrigerated (2 C to 8 C) and must not be frozen. Any unused suspension must be discarded after 10 days.

All forms must be kept out of the sight and reach of children. Unused or expired medication should be disposed of by mixing it with an undesirable substance (like dirt) in a sealed plastic bag before placing it in household trash, as specified by official disposal protocols. Local pharmaceutical waste regulations should also be followed.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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