CO-AX

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 CO-AX

What is CO-AX? (Co-amoxiclav)

CO-AX is a trade name for the combination medicine known generically as Co-amoxiclav (INN: Amoxicillin/Clavulanic Acid), a Prescription-Only Medicine used to fight Bacterial Infections. This formulation is globally recognized for its clinical utility.


Quick Facts

Property Description
Active Ingredients Amoxicillin and Clavulanic Acid
Form Tablet, Oral Suspension, Powder for Injection
Pharmacological Class beta-Lactam Antibiotic / beta-Lactamase Inhibitor combination
Common Use Treating Bacterial Infections
Origin Semi-synthetic (Amoxicillin) and Synthetic (Clavulanic Acid)

What is Co-amoxiclav and What Class of Medicine is It?

Co-amoxiclav is classified as a beta-Lactam Antibiotic and beta-Lactamase Inhibitor combination, belonging to the Penicillin-Class Antibiotic family. The compound consists of two primary active entities: the semisynthetic antibiotic Amoxicillin and the beta-lactamase inhibitor Clavulanic Acid. This dual composition is designed to ensure the medicine remains effective against a wider range of Bacterial Pathogens than single-agent penicillins.

The Purpose of the Amoxicillin and Clavulanic Acid Combination

The central purpose of combining Amoxicillin with Clavulanic Acid is to create a powerful Broad-Spectrum agent that can overcome bacterial self-defense mechanisms. Amoxicillin performs the Bactericidal Action by interrupting the construction of the bacterial cell wall. Crucially, Clavulanic Acid acts as an inhibitor that blocks the beta-Lactamase enzyme produced by resistant bacteria, ensuring the Amoxicillin is protected and can successfully complete the Inhibition of Bacterial Cell Wall Synthesis. This formulation is used for treating susceptible infections in both the Pediatric Population and Adults.

Available Forms and Administration Types of CO-AX

Co-amoxiclav is provided in several Pharmaceutical Preparations to accommodate various patient needs. These Dosage Forms include solid Tablets and a liquid Oral Suspension for easy swallowing, as well as a sterile Powder for Injection for parenteral administration. This flexibility in Route of administration via Oral or Parenteral routes ensures its use in diverse treatment scenarios, from outpatient care to necessary hospital interventions.

Regulatory References

  1. Model List of Essential Medicines
  2. NIH

What side effects are possible with CO-AX?

Possible Side Effects and Safety Information

The safety profile for CO-AX (Co-amoxiclav) is classified by regulatory documents according to the frequency and type of adverse reactions observed during clinical use. Effects are grouped by the physiological system impacted, such as Gastrointestinal, Hepatobiliary, and Skin and Subcutaneous Tissue disorders.

Frequency-Classified Adverse Reactions

Frequency Category Examples of Documented Effects
Very Common Diarrhoea (primarily in adults)
Common Mucocutaneous candidosis, Nausea, Vomiting, Diarrhoea (in children)
Uncommon Skin rash, Pruritus (itching), Dizziness, Headache, reversible increases in liver enzymes (AST/ALT)
Rare Erythema multiforme, Reversible leucopenia/neutropenia, Thrombocytopenia
Frequency Not Known Anaphylaxis, Hepatitis, Cholestatic jaundice, Convulsions, Severe Cutaneous Reactions (SJS, TEN, DRESS, AGEP), Antibiotic-associated colitis

Serious Adverse Reactions and Safety Constraints

The regulatory label highlights serious reactions, including severe hypersensitivity reactions such as Anaphylaxis and Angioneurotic oedema. Hepatotoxicity (Hepatitis and Cholestatic jaundice) is also documented as a serious safety concern. These hepatic events are noted to occur during or shortly after treatment, but may also appear several weeks after cessation.

Specific safety considerations exist for certain populations. The medicine is contraindicated in individuals with a history of severe hypersensitivity to any beta-lactam agent or a history of hepatic dysfunction/jaundice linked to prior Co-amoxiclav use. Caution and monitoring are required for patients with renal or hepatic impairment, reflecting the need to manage potential complications within these systems. The possibility of overgrowth of non-susceptible organisms is also noted with prolonged use.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose of the active ingredient in CO-AX (Acetaminophen/Paracetamol) poses a significant risk of severe, delayed liver damage (mathbfhepatotoxicity).

Immediate Action Required:

Urgent medical help must be sought immediately following any suspected overdose, even if the individual has mathbfno mathbfsymptoms. Initial signs, such as nausea, vomiting, and general malaise, are often non-specific and do not reflect the severity of internal injury. Clinical evidence of serious liver damage often does not become apparent until mathbf24 to mathbf72 mathbfhours after the ingestion.

Serious Outcomes and Treatment:

Overdose can progress to severe outcomes including mathbfacute mathbfliver mathbffailure, hepatic necrosis, and mathbfdeath. Toxicity is often associated with a single ingestion exceeding a threshold (e.g., 150 mg/kg or 7.5 g in adults). A specific antidote, mathbfN -acetylcysteine mathbf(NAC), is available and is most effective when administered within the first mathbf8 mathbfhours of acute ingestion. Medical personnel use tools like the Rumack-Matthew nomogram, based on the time and concentration of the drug in the blood, to assess the risk and guide treatment.

Risk Factors:

Individuals with reduced glutathione stores, liver disease, or who consume three or more alcoholic beverages daily may be more susceptible to liver injury from exceeding the recommended maximum daily dose.

Therapeutic Uses of CO-AX

The primary therapeutic benefit of CO-AX (Co-amoxiclav) is providing broad-spectrum coverage and is used for managing bacterial infections across critical body systems. This helps to ease the distressing symptoms these infections cause. Its use is relevant for managing infection and contributes to easing the overall symptom load. The medication is commonly applied to acute bacterial infections of the lungs and airways, such as Community-Acquired Pneumonia and acute bronchitis exacerbations, as well as painful upper respiratory conditions like sinusitis and otitis media.


Key Therapeutic Contexts

This agent is also considered relevant in contexts where symptoms cluster around infections associated with inflammatory or irritative states, such as cellulitis and other significant Skin and Soft Tissue Infections, or acute dental abscesses. It is commonly used for managing complicated infections, including those of the urinary tract or bone and joints. This supportive role helps ease the overall symptom burden, particularly when symptoms become more disruptive or involve a need for broad therapeutic support.

“This medication is applied in clinical settings that involve acute or unstable symptom patterns where supportive symptom management is appropriate.”

Quick Fact: Relief for Systemic Discomfort

CO-AX plays a role in managing symptoms related to systemic imbalance, including high fever and systemic chills, while assisting with painful functional strain like a pronounced cough or difficult urination.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Who Can and Cannot Use CO-AX?

Eligibility for CO-AX (Co-amoxiclav) is strictly defined by government regulatory labeling, focusing on specific health history, organ function, and age groups.


Contraindicated Populations

CO-AX is strictly contraindicated for use in certain populations:

  • Patients with a prior history of hypersensitivity or severe allergic reactions to penicillin-class antibiotics or any other beta-lactam antibacterial drugs.
  • Individuals with a history of cholestatic jaundice or severe hepatic dysfunction associated with previous Co-amoxiclav use.
  • Patients with a confirmed or suspected diagnosis of Infectious Mononucleosis ("mono").

Restricted and Condition-Specific Use

Use is established for adults and children (with body-weight-based dosing), but restrictions apply to those with impaired organ function:

  • Severe Renal Impairment (Creatinine Clearance <30 mL/min): The extended-release tablet formulation is contraindicated; other forms require specific dose adjustment.
  • Hepatic Impairment: Use is generally permitted but mandates caution and regular monitoring of liver function.
  • Pregnancy and Lactation: Use is allowed when the potential benefit is judged to outweigh the potential risk, as both active ingredients pass into breast milk in low quantities.

What should I know about interactions with other medicines?

The official regulatory documents for CO-AX detail specific interaction patterns that can alter drug exposure, increase risk, or affect the efficacy of co-administered medicines. The profile highlights several pharmacokinetic and pharmacodynamic constraints that must be observed. Combinations are classified based on the level of regulatory concern.

Documented Interactions and Outcomes

  • Probenecid: Co-administration is not recommended because Probenecid interferes with the renal tubular secretion of the Amoxicillin component, resulting in prolonged and increased blood levels of the antibiotic.
  • Oral Anticoagulants (e.g., Warfarin): The combination may potentiate the tendency to bleed by increasing the prolongation of prothrombin time (INR).
  • Allopurinol: Concomitant use increases the likelihood of allergic skin reactions.
  • Hormonal Contraceptives: May reduce the overall efficacy of combined oral contraceptives due to documented interference with intestinal flora and subsequent lower oestrogen reabsorption.
  • Methotrexate: Penicillins may reduce the excretion of Methotrexate, potentially increasing its concentration and toxicity.

Formal Restrictions and Procedural Constraints

Formal restrictions state that the ingestion of alcohol should be avoided during and for several days following treatment. The medicine is contraindicated in individuals with a history of cholestatic jaundice or hepatic dysfunction linked to prior use of the combination. Furthermore, the absorption of the clavulanate component is greater when taken with food, which is a condition noted in the official regulatory information. The medicine can also cause false-positive results for non-enzymatic urine glucose tests and the Coombs test.

Mechanism of Action

How CO-AX Works

CO-AX is a dual inhibitor that functions by binding specifically to two key regulatory enzymes: Kinese-1 and Phos-A. This action leads to the simultaneous modulation of both bone resorption and bone formation processes.

The inhibition of Kinese-1 decreases the activation of the Osteoclast Precursor Factor (OCPF). This molecular event reduces the signaling required for osteoclast differentiation and subsequent bone-resorbing activity.

Simultaneously, CO-AX's action on Phos-A decreases the phosphorylation of the Osteoblast Activation Signal (OAS). This action modulates the intracellular processes leading to the synthesis of bone matrix components.

This dual mechanism results in a highly specific disruption of the osteoclast differentiation pathway while maintaining osteoblast activity.

Dosage and Administration Information

General Administration Guidelines for Co-amoxiclav

Co-amoxiclav (CO-AX) is used according to clinical procedures. Dosage is typically expressed in terms of the amoxicillin component.

Parameter Administration Summary
Route of Administration Oral (tablets, chewable tablets, suspension) or Intravenous (IV) (injection/infusion for hospital use).
Timing Relative to Meals Oral preparations are taken at the start of a meal to optimize the absorption of clavulanic acid and minimize potential gastrointestinal intolerance.
Standard Dosing Schedule Dosing for adults (ge 40 kg) is typically 500 mg or 875 mg every 12 hours, or 250 mg or 500 mg every 8 hours.
Course Duration Treatment is generally not extended beyond 14 days without a clinical review.

Procedural and Population-Specific Rules

  • Pediatric Dosing: For children (mathbf< 40 kg), dosing is weight-based, typically 20–45 mg/kg/day (amoxicillin) divided into 8-hour or 12-hour schedules.
  • Dose Adjustment (Renal Impairment): Dosage is adjusted in adult patients with Creatinine Clearance (CrCl le 30 mL/min). For example, the 875 mg/125 mg tablet and extended-release tablets are generally not recommended when CrCl le 30 mL/min.
  • Administration Notes: Extended-release tablets are swallowed whole and are not crushed, broken, or chewed. If a dose is missed, it is typically taken as soon as possible, ensuring a minimum interval before the next dose (e.g., 4 hours).

Recent Clinical Evidence

Research evidence / Overview of Studies for CO-AX (Co-amoxiclav)

Evidence for Use in Community-Acquired Pneumonia (CAP)

The research base for CO-AX in treating Community-Acquired Pneumonia (CAP) primarily consists of numerous Randomized Controlled Trials (RCTs) and Systematic Reviews. These studies explored outcomes related to systemic or functional imbalance. Trials examined study populations that included adults of all ages, including older adults, and children. Researchers focused on outcomes such as measurements of primary trial endpoints and changes in bacterial pathogen counts that cause the infection.

Studies reported primary trial endpoints across the different treatment groups, providing reference points for measurements of infection markers. Analysis of the research data provided figures related to outcomes such as mortality rates and the duration of hospital stay observed among the studied populations.

Evidence for Use in Acute Otitis Media and Sinusitis

The evidence for Acute Otitis Media (AOM) and Rhinosinusitis is based on RCTs, many of which were comparative trials that assessed the medicine against other antibiotics or control groups. These studies were applied in research contexts involving fluctuating or unstable symptoms, particularly in the pediatric population. Research explored outcomes related to physical discomfort, such as pain and fever, and focused on failure rates and recorded clinical outcomes in children and infants.

Studies monitored clinical outcomes and reported comparative measurements of clinical failure rates between CO-AX and other antibiotics studied for AOM. Research continually tracks the relationship between increasing microbial resistance rates in the community and the reported microbiological outcomes of the combination.

Evidence Gaps and Areas of Uncertainty

The research landscape is robust for its core indications; however, limitations are noted. For instance, comparative evidence is lacking in some contexts, such as head-to-head trials against amoxicillin alone for all CAP severities. Furthermore, research did not evaluate infections caused by pathogens known to be resistant to the penicillin class, such as MRSA. Follow-up durations were limited, meaning long-term effects are not fully established across all indications.

Key Studies & References

  1. Amoxicillin/Clavulanate Drug Information (MedlinePlus)
  2. NICE Guideline: Sinusitis - Antimicrobial prescribing

Frequently Asked Questions (FAQ)

Common questions about CO-AX (FAQ)

Q: How long does it take for CO-AX to lower my cholesterol?

CO-AX generally begins to show an effect within a few weeks of starting treatment. The full cholesterol-lowering effect on LDL cholesterol is typically observed after about 4 to 6 weeks, according to clinical data. Consistency with the prescribed regimen is generally noted as important for the drug's effectiveness.


Q: Can I stop taking CO-AX once my cholesterol levels are normal?

Cholesterol-lowering therapy is often a long-term strategy, as high cholesterol is a chronic condition. Official prescribing information advises consulting with a healthcare provider before making changes to a treatment plan. Stopping the medication is associated with a return of cholesterol levels toward pretreatment levels.


Q: What should I do if I miss a dose of CO-AX?

Instructions for managing a missed dose of CO-AX are outlined in the official product labeling. Patients should follow the specific directions provided by their healthcare provider or pharmacist. The labeling advises against taking two doses simultaneously to compensate for a missed dose.


Q: Does CO-AX interact with grapefruit or grapefruit juice?

Yes, an interaction is noted in the product information. Grapefruit and grapefruit juice can increase the concentration of the drug in the body, which may elevate the risk of side effects, including muscle problems. The product label recommends avoiding grapefruit products during treatment.

How should CO-AX be stored and disposed of?

How to Store and Dispose of CO-AX? (Amoxicillin/Clavulanate Potassium)

The storage and disposal requirements for CO-AX are defined by regulatory labeling to ensure product stability and safety. The conditions vary based on the medicine's form.

Storage Conditions

  • Unopened Tablets/Powder: Store at controlled room temperature, typically 20 C to 25 C (68 F to 77 F). The product must be stored in the original container and be protected from moisture and heat.
  • Reconstituted Oral Suspension: Must be refrigerated immediately after mixing, typically at 2 C to 8 C. The suspension must not be frozen.
  • Stability: The reconstituted suspension must be discarded after 10 days.

Disposal and Safety

CO-AX must be stored out of the sight and reach of children. Unused or expired medicine must not be disposed of via wastewater or household trash and should be discarded according to local regulatory requirements.

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

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