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Clamoxin 12H

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Clamoxin 12H

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Method of action: Antibiotic Combination

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.

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Overview of Clamoxin 12H

What is Clamoxin 12H?

Clamoxin 12H is a combination antibiotic medication designed to treat various bacterial infections. It belongs to a class of drugs known as penicillin-type antibiotics. The medication is formulated to release its active components over a period of time, allowing for a twice-daily dosing schedule.

Composition and Mechanism

Clamoxin 12H consists of two primary active ingredients that work together to eliminate bacteria:

  • Amoxicillin: A broad-spectrum antibiotic that works by stopping the growth of bacteria. It attaches to the bacterial cell wall, preventing the bacteria from properly forming the structure they need to survive.
  • Clavulanic Acid: This component is a beta-lactamase inhibitor. Some bacteria produce enzymes called beta-lactamases that can destroy amoxicillin before it can work. Clavulanic acid blocks these enzymes, protecting the amoxicillin and allowing it to effectively treat infections that might otherwise be resistant to it.

General Uses

This medication is typically used to manage infections caused by susceptible strains of bacteria in different parts of the body. Common areas of application include:

  • Respiratory Tract: Infections of the sinuses, throat, and lungs.
  • Ear and Nose: Middle ear infections and related conditions.
  • Urinary Tract: Bacterial infections affecting the bladder or kidneys.
  • Skin and Soft Tissue: Infections resulting from wounds, bites, or dental issues.

Because Clamoxin 12H is an antibiotic, it is only effective against bacterial infections. It does not work for viral infections such as the common cold or the flu.

Regulatory References

  1. NIH StatPearls: Amoxicillin-Clavulanate
  2. DailyMed: Amoxicillin and Clavulanate Potassium Extended-Release
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What side effects are possible with Clamoxin 12H?

Possible Side Effects and Safety Information

The safety profile for Clamoxin 12H (Amoxicillin/Clavulanate) is officially classified by frequency and by the organ system affected, as documented in regulatory prescribing information. Understanding these classifications provides a clear overview of possible adverse reactions.

Frequency-Classified Adverse Reactions

The most commonly documented adverse reactions relate to the Gastrointestinal Disorders system.

  • Very Common (Affects 1 in 10 or more): Diarrhea.
  • Common (Affects up to 1 in 10): Nausea, vomiting, and mucocutaneous candidiasis.
  • Uncommon (Affects up to 1 in 100): Headache, dizziness, indigestion, and transient rises in liver enzymes (AST and/or ALT).

Serious Adverse Reactions and Safety Constraints

While uncommon, certain serious adverse reactions are documented in official labeling. These include the potential for severe hypersensitivity reactions such as anaphylaxis and angioedema. Severe cutaneous adverse reactions, including Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), have also been reported.

Safety constraints and precautions related to existing conditions are established in the regulatory profile. The medication is contraindicated in individuals with a known history of hypersensitivity to any penicillin or in patients with a history of cholestatic jaundice or hepatic dysfunction associated with prior use of Amoxicillin/Clavulanate.

Hepatic Events and Timing: Regulatory notes indicate that while liver-related events are generally reversible, signs of hepatic dysfunction may not become apparent until several weeks after treatment has ceased.

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Overdose and Emergency Response

Overdose and when to seek help

Overdose with Clamoxin 12H (Amoxicillin and Clavulanate Potassium Extended-Release) requires immediate attention due to the potential for specific clinical and physiological consequences documented in regulatory labeling.

Documented Manifestations and Serious Outcomes

Acute overdosage primarily involves gastrointestinal symptoms, including abdominal pain, vomiting, and diarrhea, which can lead to fluid-electrolyte imbalance.

A serious documented risk, especially with high doses of the amoxicillin component, is the formation of amoxicillin crystalluria, a condition that may result in renal failure. Central nervous system effects, such as convulsions, are also described in cases of severe overdose, particularly in patients with pre-existing renal impairment.

Emergency Actions Mandated by Regulators

Official labeling mandates that any suspected overdose requires the patient to seek immediate medical attention. Treatment is universally defined as symptomatic and supportive. Regulatory documents confirm that no specific antidote is known for this overdose.

If the ingestion was recent, supportive measures may include gastric lavage. To aid in clearance of the active components, haemodialysis can be utilized. Given the risk of crystalluria, close monitoring of renal function is required.

Immediate medical help must be sought for severe symptoms such as convulsions or signs of acute renal impairment.

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Therapeutic Uses of Clamoxin 12H

What Clamoxin 12H Treats: Main Uses and Benefits

The medication Clamoxin 12H (Extended-Release Amoxicillin/Clavulanate Potassium) is applied in therapeutic contexts for managing bacterial infections and is used in cases where common resistance factors are a concern. This formulation is indicated for treating specific infections in adults and adolescents.

It is primarily used for conditions associated with acute or disruptive symptom patterns from bacterial episodes, notably Community-Acquired Pneumonia (CAP) and Acute Bacterial Sinusitis. This medicine helps address groups of symptoms that may appear suddenly or intensify over time, such as high fever, chest pain, and severe facial pressure.

When symptoms become more noticeable and supportive relief is needed, its combination formulation supports managing infections when resistance may be a factor. This characteristic assists with maintaining functional stability and helps ease the overall symptom burden.

Quick Fact
Symptom Management Applied across domains where additional symptomatic support is needed.
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Eligibility and Restrictions for Use

Who Can and Cannot Use Clamoxin 12H?

This section outlines the population eligibility rules for Clamoxin 12H (Amoxicillin and Clavulanate Potassium Extended-Release Tablets) as defined in official regulatory documents. Use is defined by specific age, weight, and health history constraints.


Contraindicated Populations (Must Not Use)

The medicine is strictly contraindicated for patients with the following conditions:

  • A history of serious hypersensitivity reaction (e.g., anaphylaxis) to amoxicillin, clavulanate, or any other penicillin-class (beta-lactam) antibacterial drugs.
  • A history of cholestatic jaundice or liver dysfunction previously associated with the use of amoxicillin/clavulanate.
  • Severe renal impairment, defined as a Creatinine Clearance ( CrCl) less than 30 mL/min.
  • Patients undergoing hemodialysis.

Eligibility by Age and Condition

Population Group Eligibility Status
Adults and Adolescents (ge 40 kg) Allowed (primary labeled population).
Pediatric Patients (< 40 kg) Not established/Not Recommended for this Extended-Release formulation.
Infectious Mononucleosis Use should be avoided (risk of rash).
Hepatic Impairment Restricted/Use with Caution (monitoring advised).
Pregnancy and Lactation Restricted/Conditional (use only if clearly needed; components pass into breast milk).
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What should I know about interactions with other medicines?

Clamoxin 12H Interactions with other medicines and products

Official regulatory documents specify distinct interaction patterns when Clamoxin 12H is co-administered with certain medicinal products and food. These interactions are classified based on pharmacokinetic (PK) or pharmacodynamic (PD) effects.

Pharmacokinetic and Exposure Interactions

The systemic exposure to the amoxicillin component is formally altered by certain co-administered substances. Probenecid is documented to cause an increase and prolongation of amoxicillin plasma concentrations by inhibiting its renal tubular secretion. This effect constitutes a significant pharmacokinetic interaction. Additionally, the regulatory profile states that the effectiveness of combination oral contraceptives may be reduced.


Pharmacodynamic Interactions and Restrictions

Co-administration with oral anticoagulants, such as Warfarin, is associated with the potential for increased prolongation of prothrombin time (INR), which indicates a documented pharmacodynamic effect on blood coagulation. A note is also made that concurrent use with Allopurinol may increase the incidence of a skin rash.


Food-Related Administration Constraints

The regulatory profile includes administration constraints related to food intake. Taking this medicine with a high-fat meal is explicitly not recommended, as this practice causes a measurable decrease in the absorption of the clavulanate component. To optimize absorption and manage potential gastrointestinal effects, administration with a standardized meal is noted.

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Mechanism of Action

Clamoxin 12H utilizes a dual mechanism, which involves destroying the bacterial cell structure and neutralizing bacterial defense enzymes.

Irreversible Breakdown of Bacterial Structure

The core action involves Amoxicillin acting as an irreversible covalent inhibitor that targets essential Penicillin-Binding Proteins (PBPs) within the bacterial membrane. By blocking the activity of these enzymes, Amoxicillin prevents the final cross-linking step of the peptidoglycan synthesis pathway. This fundamental failure to assemble a rigid cell wall leads to the inability of the bacterial cell to withstand internal osmotic pressure, resulting in rupture and cell death.

Neutralization of Enzymatic Defense

This component, driven by Clavulanate Potassium, functions as a mechanism-based suicide inhibitor against the bacterial defense enzymes known as beta-lactamases. Clavulanate irreversibly neutralizes these enzymes, preventing them from destroying Amoxicillin. This synergistic mechanism allows the primary antibiotic to remain intact, facilitating its interaction with PBPs in strains that produce beta-lactamases.

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Dosage and Administration Information

How to Use Clamoxin 12H

The administration of Clamoxin 12H (Extended-Release Amoxicillin/Clavulanate Potassium) is strictly defined by guidelines to ensure proper use. This formulation is approved solely for oral administration.


Official Dosing and Administration Schedule

Instruction Entity Standard
Route of Administration Oral (by mouth) only.
Standard Single Dose Two (2) 1000 mg/62.5 mg tablets taken simultaneously.
Dosing Frequency Every 12 hours (twice daily).
Intake Condition Must be taken at the start of a meal to enhance absorption and minimize gastrointestinal intolerance. It is not recommended to take with a high-fat meal.
Course Duration Acute Bacterial Sinusitis: 10 days. Community-Acquired Pneumonia: 7 to 10 days.

Administration and Procedural Rules

Clamoxin 12H tablets must be swallowed whole and must not be crushed, broken, or chewed; violating this rule compromises the extended-release mechanism. The medication is only intended for adults and pediatric patients weighing 40 kg or more who are able to swallow the tablets whole.

If a dose is missed, it should be taken as soon as it is remembered. However, if it is almost time for the next dose, the missed dose should be skipped, and the patient should return to the regular schedule. The extended-release formulation is not for use in patients with severe renal impairment (creatinine clearance < 30 mL/min) or those on hemodialysis.

These instructions define a standardized, time-bound protocol for the use of the drug, ensuring consistency with the labeled use of the extended-release formulation.

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Recent Clinical Evidence

Research evidence / Overview of studies for Clamoxin 12H

Evidence for use in Community-Acquired Pneumonia (CAP)

The research exploring Clamoxin 12H for Community-Acquired Pneumonia (CAP) is primarily based on Randomized Controlled Trials (RCTs). These are trials where participants are randomly assigned to receive either the medicine or another comparative treatment. These trials were primarily conducted among Adults and Adolescents (typically age 16 and older) with CAP. Research examined endpoints such as the Clinical Success/Cure Rate, which is one of the key outcomes measured in such research. Studies also monitored the status of Bacteriological Eradication, measuring the status of bacterial presence.

Clinical trials reported various measurements of Clinical Success and Bacteriological Eradication rates within the studied cohorts. Research highlights changes measured during the short-term study period, typically concluding at the end of treatment and a subsequent follow-up visit. The evidence reviewed by regulators included short-term RCTs, but certain areas remain under-characterized.


Evidence for use in Acute Bacterial Sinusitis

For Acute Bacterial Sinusitis, the evidence base also largely consists of short-term Randomized Controlled Trials (RCTs) that explored how symptoms evolved in the observed populations of Adults and Adolescents. Research teams evaluated outcomes related to the Clinical Success/Cure Rate and also monitored patient-reported outcomes describing perceived discomfort related to the sinuses. Supporting studies characterized the drug concentration profile of the extended-release formulation.

The research describes the patterns of symptom changes observed in the participants of the trials. This evidence provides context on the research of Clamoxin 12H when the infection is confirmed to be bacterial and involves organisms found to be susceptible to the medicine in the lab.


What is still uncertain about Clamoxin 12H Research

Long-term effects and sustained functional status following the immediate treatment course are not fully established. There is limited information for outcomes that extend beyond the standard treatment duration, such as sustained functional status or rates of infection recurrence.

The results apply only to the populations studied and the specific conditions under which they were conducted. For instance, the research is clear that the medicine was studied for bacterial infections caused by susceptible organisms, and research into its clinical use outside of this strict boundary is not established by the regulatory evidence. Data for certain groups, particularly pediatric populations, remain insufficient.

Key Studies & References Clinical Practice Guideline: Adult Sinusitis (Update) (AAO-HNSF 2015)

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Frequently Asked Questions (FAQ)

Common questions about Clamoxin 12H (FAQ)

Q: What types of bacteria is Clamoxin 12H commonly used to address?

According to the official product information, Clamoxin 12H is used to treat specific bacterial infections caused by susceptible organisms. This typically includes certain strains of common bacteria, such as Haemophilus influenzae and Staphylococcus aureus. The medicine is only intended for use against bacteria that are known to be affected by this drug combination.

Q: Are there different strengths of Clamoxin 12H available?

The official drug label for the extended-release (12H) formulation specifies only one strength. The active components are Amoxicillin and Clavulanate Potassium, formulated in a specific ratio for this extended-release product. The prescribing healthcare provider determines the required number of tablets per dose.

Q: Is Clamoxin 12H known to cause drowsiness or affect alertness?

Official documentation does not list drowsiness or sleepiness as a common side effect of the medicine when taken as prescribed. However, sleepiness has been reported as a potential symptom in cases of accidental overdose. Any new or unexpected effects, such as drowsiness, should be discussed with a healthcare provider.

Q: Is Clamoxin 12H generally described as being safe for people with kidney problems?

The official product information has specific guidance regarding kidney function. The extended-release tablets are contraindicated (not recommended for use) in patients with severe kidney impairment or those undergoing hemodialysis. The use of this medicine in patients with mild kidney problems should be discussed with a healthcare provider, as it may still require caution.

Q: What happens in the body that makes Clamoxin 12H a 12-hour formulation?

Clamoxin 12H is manufactured as an extended-release (XR) tablet. This specialized formulation is designed to release the active ingredients slowly and consistently into the body over a 12-hour period. This sustained release helps maintain drug concentrations between doses, which is consistent with a 12-hour administration schedule.

Q: What is the research status regarding Clamoxin 12H use during pregnancy?

Official documents classify this medicine as Pregnancy Category B. This means that animal reproduction studies have not demonstrated a risk to the fetus. Official information states that the medicine should only be used during pregnancy if the potential benefit justifies the potential risk, as determined by a healthcare professional.

Q: How is the possibility of antibiotic resistance discussed in relation to Clamoxin 12H?

Regulatory documents emphasize that using any antibiotic inappropriately increases the risk of developing drug-resistant bacteria. Official product information states that the medicine is intended only for bacterial infections that are confirmed or strongly suspected to be susceptible, to help mitigate the risk of developing drug-resistant bacteria.

Q: How is the mechanism of action of Clamoxin 12H summarized in patient-friendly terms?

The medicine works in two ways. The Amoxicillin component is the primary actor, stopping the bacteria from building their protective cell walls, which causes the bacteria to die. The Clavulanate Potassium component acts as a shield, protecting the amoxicillin from bacterial enzymes that the bacteria use to defend themselves.

Q: Where does the official drug information for Clamoxin 12H come from?

Authoritative drug information, including official prescribing instructions and safety warnings, is published by governmental health agencies. Examples include the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA). These sources are the foundation for patient information leaflets and educational materials.

Q: Is there information about the safety of Clamoxin 12H for older adults?

According to the official label, older adults may have decreased kidney function, which can affect how the medicine is processed. Due to this consideration, a healthcare provider may decide that monitoring of kidney function is appropriate. There is also a noted increased risk for C. difficile-associated diarrhea in this population.

Q: Are there any known interactions between Clamoxin 12H and caffeine?

Official drug interaction checkers and product labels have not reported any significant interaction between the active components of this medicine and caffeine. The official prescribing information contains a comprehensive list of all documented drug interactions.

Q: What does official guidance say about consuming alcohol while taking Clamoxin 12H?

Regulatory documents indicate that there is no direct chemical interaction between the medicine and alcohol. However, since the drug commonly causes gastrointestinal side effects like nausea and diarrhea, consuming alcohol may increase the risk or severity of these effects.

Q: Is it considered safe to take herbal supplements while using Clamoxin 12H?

Generally, there is no official data or controlled testing specifically available for interactions between prescription medicines like this and most herbal or dietary supplements. Due to the limited data, the concurrent use of herbal supplements or non-prescription products should be reviewed with a healthcare provider.

Q: Can Clamoxin 12H be used for prevention in certain medical contexts?

The official indications for this medicine are for the treatment of certain established bacterial infections, such as Community-Acquired Pneumonia and Acute Bacterial Sinusitis. The regulatory label does not include use for preventing infection (prophylaxis) in medical contexts.

Q: Why is it important to continue using Clamoxin 12H even after symptoms improve?

Regulatory guidance advises that the full course of therapy, as prescribed by a healthcare provider, should be completed even if symptoms begin to improve. Completing the prescribed duration is critical for helping to ensure the infection is fully resolved and for reducing the risk of the bacteria becoming resistant to the medicine.

Q: What does the drug label indicate about sharing Clamoxin 12H with others?

Regulatory safety guidelines state that this medicine is intended only for the person for whom it was prescribed and should not be shared with others. Taking prescription medicine without proper assessment can lead to harm, inappropriate treatment, and the development of antibiotic resistance.

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How should Clamoxin 12H be stored and disposed of?

How to Store and Dispose of Clamoxin 12H

Storage and disposal instructions for Clamoxin 12H (Amoxicillin and Clavulanate Potassium Extended-Release Tablets) are strictly defined by regulatory labeling to maintain the drug's effectiveness and ensure safety.

Official Storage Requirements

Condition Requirement
Temperature Store at 25°C (77°F); permitted excursions between 15°C and 30°C (59°F and 86°F).
Container Must be stored in the original container, kept tightly closed, and with the desiccant.
Protection The medication must be protected from moisture and must not be frozen.
Safety Keep out of the sight and reach of children in a secure place.

Official Disposal Instructions

Unused or expired Clamoxin 12H must not be thrown away in household waste or flushed down the toilet. Disposal must be performed in accordance with local requirements; consult a pharmacist for guidance on proper pharmaceutical waste handling.

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

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