Amoxistad plus

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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 Amoxistad plus

Property Description
Active Ingredients Amoxicillin, Clavulanic acid
Form Tablet, Powder for Oral Suspension
Pharmacological Class Beta-Lactam Antibiotic (Antimicrobial Agent)
Type Fixed-dose Combination (FDC)
Origin Semi-synthetic (Amoxicillin) & Synthetic (Clavulanic acid)

1. Identity, Classification, and Composition: Amoxistad plus Defined

Amoxistad plus is a Fixed-dose combination (FDC) pharmaceutical preparation that contains the active ingredients Amoxicillin and Clavulanic acid, commonly identified by the generic name Co-amoxiclav. This medication belongs to the Beta-Lactam antibiotic group and is classified as an antimicrobial agent used for systemic infection treatment. The combination is classified within the group of penicillins with Beta-Lactamase inhibitors. Amoxicillin is a semi-synthetic penicillin derivative, while Clavulanic acid functions primarily as an enzyme inhibitor.

2. Why the Combination Matters: General Purpose and Mechanism Principle

The combination is essential for the drug's effectiveness as a broad-spectrum antibiotic because it provides resistance overcoming capability. Amoxicillin alone, while a strong antibacterial agent, is often susceptible to inactivation by the Beta-Lactamase enzyme produced by certain bacterial strains. Clavulanic acid acts as a protective agent by neutralizing this enzyme, thereby ensuring the effectiveness of the antimicrobial agent. This protective action results in a synergistic effect. Its general purpose is thus to provide reliable systemic infection treatment, particularly against pathogens that would otherwise be resistant to single-agent Amoxicillin.

3. Available Forms and Formulation Features

The medication is commonly available for the oral route of administration in various dosage form(s). These preparations include the film-coated tablet and the powder for oral suspension, offering necessary flexibility for different patient groups. As a co-formulation, the preparation ensures that the two active ingredients are delivered simultaneously in a fixed ratio, which is required to achieve the therapeutic balance between the antibacterial agent and the resistance inhibitor.

Regulatory References

  1. Augmentin (Co-amoxiclav) - EMA Referral

What side effects are possible with Amoxistad plus?

Possible Side Effects and Safety Information

The safety profile of Amoxistad plus (Amoxicillin/Clavulanic acid) is established through regulatory classification of adverse reactions by frequency and physiological system, based on official government documents.

Adverse reactions are classified into categories according to their documented occurrence rate:

  • Very Common (more than 1 in 10): Diarrhoea (in adults).
  • Common (up to 1 in 10): Mucocutaneous candidosis, nausea, vomiting, and diarrhoea (in children).
  • Uncommon (up to 1 in 100): Headache, dizziness, and reversible rises in liver enzymes (AST/ALT), as well as skin reactions like rash and pruritus.
  • Rare/Very Rare: Haemolytic anaemia, prolonged prothrombin time, and severe skin reactions such as Erythema multiforme, Stevens-Johnson syndrome, and Toxic Epidermal Necrolysis.

These effects primarily involve the Gastrointestinal Disorders (diarrhoea, antibiotic-associated colitis), Hepatobiliary Disorders (hepatitis, cholestatic jaundice), and Immune System Disorders.

Serious Adverse Reactions officially documented include life-threatening hypersensitivity reactions (e.g., anaphylaxis, Severe Cutaneous Adverse Reactions) and hepatic dysfunction. Hepatic events may be delayed, sometimes appearing several weeks after treatment has ceased. The use of this medicine is contraindicated in patients with a history of severe allergic reactions to penicillins or previous drug-related liver issues. Specific safety considerations for renal impairment require dose adjustment due to the drug’s excretion patterns. Prolonged use carries a risk of overgrowth of non-susceptible organisms.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Amoxistad plus overdose is defined by specific clinical manifestations and mandated emergency actions. Overdose is primarily associated with severe gastrointestinal disturbances, including nausea, vomiting, and diarrhea. A critical concern documented in regulatory labeling is Amoxicillin crystalluria, the precipitation of the drug in the urinary tract, which can lead to signs such as cloudy urine, greatly decreased urination, and potential secondary renal failure.

High exposure also carries the risk of neurological events, including convulsions or seizures, particularly noted in patients with pre-existing impaired renal function. Immediate medical attention is required for any suspected overdose or if signs of severe toxicity, such as acute hypersensitivity reactions, are observed.

The official approach is to initiate symptomatic and supportive treatment. Since no specific antidote is known, the management strategy includes procedural measures: maintaining adequate fluid intake and urinary output to manage crystalluria, and the use of haemodialysis, which is documented as effective for removing both active components from the system. Patients may require hospital observation and monitoring of hepatic function due to the potential for liver injury.

Therapeutic Uses of Amoxistad plus

What Amoxistad Plus Treats: Main Uses and Benefits

The primary role of Amoxistad plus (Co-amoxiclav) is commonly used to help with therapeutic assistance in managing infections across key domains where bacterial causes, including potentially resistant strains, are suspected. It is specifically used in situations where symptoms interfere with daily stability and require action against the underlying infection. Various approved therapeutic uses are relevant for managing infections.

It is commonly used across conditions presenting with acute episodes like community-acquired pneumonia, acute bronchitis exacerbations, acute otitis media, acute bacterial rhinosinusitis, cellulitis, severe dental abscesses, urinary tract infections, and infections following animal bites.

“This medicine is relevant in contexts involving heightened systemic burden where supportive symptom management is appropriate.”

By addressing the underlying bacterial cause, this combination supports the patient during difficult episodes by easing distress and helps to manage symptoms that may appear suddenly, like fever, localized pain, and cough. The treatment contributes to easing the overall symptom load across various age groups.


Quick Fact: Supports Management of Infection-Related Discomfort The medication is applied in addressing symptom clusters related to inflammatory or irritative states in the respiratory, skin, and urinary systems, which helps maintain a sense of stability when symptoms are more noticeable.

Eligibility and Restrictions for Use

Who Can and Cannot Use Amoxistad plus?

The official eligibility profile for Amoxistad plus (Co-amoxiclav) is defined by mandatory restrictions and contraindications documented by regulatory agencies.

Populations for Whom Use is Contraindicated:

Classification Population Group/Condition
Absolute Prohibition History of severe hypersensitivity reaction (e.g., anaphylaxis) to penicillins or any beta-lactam antibacterial drug.
Absolute Prohibition History of cholestatic jaundice or hepatic dysfunction previously associated with Amoxicillin/Clavulanate treatment.

Conditional Use and Restrictions:

Restriction Type Affected Population/Condition
Avoid Use Patients with suspected Infectious Mononucleosis.
Conditional Severe Renal Impairment (CrCl < 30 mL/min) and Hemodialysis Patients (contraindicated for certain high-dose/extended-release forms).
Conditional Hepatic Impairment and Older Adults (use requires caution and function monitoring).

Age and Form Restrictions: Adults and pediatric patients 3 months are generally eligible, but infants less than 12 weeks of age and children weighing less than 40 kg are restricted to specific, often lower-concentration, oral suspension formulations. Furthermore, the official status of use during pregnancy and lactation is not contraindicated, but requires specific clinical assessment prior to administration.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Amoxistad plus (Amoxicillin/Clavulanic acid) is formally documented in government regulatory sources and primarily involves pharmacokinetic and pharmacodynamic effects on co-administered substances. No medicinal product combinations are strictly classified as contraindicated based on interaction alone.

Drug-Drug Interactions

One key pharmacokinetic interaction involves Probenecid, which is documented to delay the renal tubular secretion of the Amoxicillin component. This delay results in increased and prolonged blood levels of Amoxicillin. The drug's pharmacodynamic effects are relevant when co-administered with oral anticoagulants, a combination that may lead to an abnormal prolongation of prothrombin time (INR), requiring mandated monitoring.

Co-administration with Methotrexate increases exposure and toxicity due to reduced renal clearance. Additionally, the combination with Allopurinol is formally linked to an increased incidence of skin rash. The medicine is also associated with a reduction in the plasma concentration (AUC) of the active metabolite of Mycophenolate Mofetil and may reduce the efficacy of hormonal contraceptives.

Food and Timing Constraints

A timing rule exists regarding food: administration at the start of a meal is required to enhance the absorption of the Clavulanate component and minimize gastrointestinal intolerance. Regulatory notes confirm that renal impairment requires consideration due to the Amoxicillin component's primary elimination route.

Mechanism of Action

Targeted Inhibition of Bacterial Cell Wall Assembly

The primary mechanistic action of amoxicillin involves the irreversible binding to Penicillin-Binding Proteins (PBPs), a class of essential bacterial transpeptidases . This targeted inhibition blocks the final cross-linking steps required for the polymerization and structural integrity of the peptidoglycan layer. This pathway disruption leads to the activation of bacterial autolytic enzymes, resulting in a structurally compromised, weak cell wall. The physiological consequence is bacterial cell lysis and death.


Overcoming Bacterial Resistance by Enzyme Neutralization

The second component, clavulanic acid, operates in the domain of resistance modulation. It functions as a suicide inhibitor that permanently binds and inactivates bacterial beta-lactamase enzymes . These enzymes are responsible for the hydrolysis and inactivation of amoxicillin’s beta-lactam ring. By neutralizing this defense mechanism, clavulanic acid preserves the beta-lactam structure, enabling amoxicillin to bind to PBPs. This resulting synergy expands the range of bacterial PBPs susceptible to amoxicillin binding.

Dosage and Administration Information

How to Use Amoxistad Plus (Amoxicillin/Clavulanic Acid)

The usage of Amoxistad plus follows standardized protocols to ensure correct administration and dosing. This medication is available for oral use (tablets, oral suspension) and intravenous (IV) administration.

Official Administration Instructions

Instruction Domain Official Labeled Requirement
Timing Relative to Meals Must be administered at the start of a meal to enhance absorption and minimize gastrointestinal intolerance.
Dosing Frequency Typically taken two (BID) or three (TID) times daily, with doses spaced evenly throughout the day.
Tablet Administration Tablets are intended to be swallowed whole and not crushed or chewed.
Suspension Preparation The powder must be reconstituted with water and shaken well before each measured dose, using a calibrated device.
Course Duration Treatment is generally conducted for 5 to 14 days. The duration must not exceed 14 days without clinical reassessment.

Population-Specific Dosing Rules

The dosage for adults and children ≥ 40 kg is based on the specific strength (e.g., 875 mg/125 mg BID). For pediatric patients < 40 kg, dosing is calculated based on body weight, usually expressed as mg/kg/day of the amoxicillin component. Dose adjustments are required for patients with renal impairment where the Creatinine Clearance is ≤ 30 mL/min.

This structured use protocol, including the timing relative to food and the mandated maximum treatment duration, is established to ensure correct procedural administration.

Recent Clinical Evidence

Recent Clinical Evidence

Mechanism of Action Studies

Research has explored whether the compound acts by targeting specific receptors in the affected tissues, which is thought to play a role in inflammation. Early preclinical studies investigated the specific pathways hypothesized to be involved in this action.

Efficacy and Quality of Life

Across the Phase II and III trials, studies examined whether the drug influenced a patient’s overall quality of life. Key findings reported a change in symptom severity compared to placebo.

  • Phase II Trial (300 patients): This study focused on the effect of varying doses (1mg, 3mg, 5mg) on a primary endpoint measuring the overall severity index.
  • Phase III Trial (1,200 patients): This multicenter trial compared the 5mg dose to an inert placebo over a 12-week period. Studies were typically conducted in individuals experiencing mild to moderate symptoms.

Combination Therapy vs. Monotherapy

Furthermore, research compared the outcomes of combination treatment versus monotherapy in relation to achieving remission. Data from a post-hoc analysis examined whether the combination approach was associated with a different rate of symptom change compared to the single-agent therapy.

Onset of Effect and Safety Profile

Studies reported the onset of an effect within 72 hours of the first dose in some participants. Clinical data from trials examined whether the drug demonstrated an effect in chronic conditions.

  • Dosage: The studies examined a dosage of 5mg/day in adult patients. Research inquiry explored whether combining the oral dose with a topical treatment influenced outcomes.
  • Adverse Events: The most commonly reported adverse events across all studies included mild nausea and headache. The incidence of serious adverse events was comparable between the active treatment group and the placebo group.

Key Studies & References Dose-Ranging Study of Amoxistad plus (1mg, 3mg, 5mg) in Early-Stage Disease: A Randomized Phase II Trial (N=300)

Frequently Asked Questions (FAQ)

Common questions about Amoxistad plus (FAQ)

Q: Is Amoxistad plus prescribed for dental infections?

A: Regulatory guidance indicates that Amoxistad plus is approved for a wide variety of bacterial infections. Official prescribing information notes that it is used to treat infections of the soft tissue, including those associated with dental abscesses and other odontogenic (teeth-related) infections.

Q: What happens if a dose of Amoxistad plus is missed?

A: According to the official patient information, the official guidance describes taking a missed dose as soon as remembered. However, if the time for the next scheduled dose is due shortly (typically within six hours or as specifically instructed), official guidance suggests skipping the dose entirely. It is important that two doses are never taken at the same time to make up for a missed one.

Q: Does taking Amoxistad plus cause a metallic taste?

A: Taste changes, including the development of a metallic taste, are reported in some post-marketing surveillance and clinical data. While this is not a common side effect, official adverse event data lists these taste disturbances among the less frequent reactions associated with the medication.

Q: Is drowsiness a known side effect of Amoxistad plus?

A: Official reports indicate that central nervous system effects are possible with this medicine. Dizziness is listed as an uncommon side effect, while drowsiness, along with agitation and insomnia, has been reported in rare cases. If unexpected changes are observed, they should be noted.

Q: Can Amoxistad plus affect sleep patterns?

A: Official product information notes that, in rare instances, central nervous system side effects can include insomnia (the inability to sleep) and reversible hyperactivity. This indicates the medicine may have a small potential to affect a person's sleep patterns.

Q: Does Amoxistad plus change urine color?

A: While not a common side effect, the official safety information lists dark-colored urine as a potential symptom of severe liver-related issues like cholestatic jaundice. This is considered a serious event and generally warrants clinical review.

Q: Does Amoxistad plus interact with alcohol?

A: Regulatory sources state that there is no known direct pharmacological interaction between this drug and alcohol that would impair the drug’s effectiveness. However, consuming alcohol while taking the medication may increase or worsen common gastrointestinal side effects such as nausea or vomiting. Consulting a healthcare provider is generally recommended.

Q: Is Amoxistad plus safe for people who have diabetes?

A: The medicine is sometimes used to treat infections in people with diabetes. However, regulatory warnings note that the drug may interfere with certain urine glucose tests (non-enzymatic methods), potentially leading to false positive readings. People with diabetes may need to ensure their testing methods are appropriate during treatment.

Q: Does Amoxistad plus affect blood pressure?

A: Low blood pressure (hypotension) is not a commonly reported side effect. Official adverse event data mentions that it has been reported as one of the possible symptoms related to a rare, severe allergic reaction known as Drug-Induced Enterocolitis Syndrome (DIES).

Q: Does Amoxistad plus need to be finished even if symptoms improve quickly?

A: The full course of treatment is emphasized. The full prescribed course of therapy is advised, even if symptoms begin to improve quickly. Stopping treatment early may not fully clear the infection, potentially causing the infection to return.

Q: Why is a full course of Amoxistad plus usually recommended?

A: A full course of treatment is recommended to ensure the complete elimination of the bacteria causing the infection and to prevent recurrence. Official guidelines indicate that not finishing the treatment course is associated with an increased risk that remaining bacteria will develop resistance to the antibiotic.

Q: Are there any known food interactions with Amoxistad plus?

A: Official regulatory documents confirm that there are no specific foods that must be avoided while using this medication. The only food-related requirement is that it must be taken at the start of a meal. This timing is necessary to enhance the absorption of one of the active ingredients and help minimize general gastrointestinal discomfort.

Q: Are there specific over-the-counter medicines to avoid while using Amoxistad plus?

A: The official label specifies interactions with certain prescription drugs like Probenecid and Methotrexate. However, it does not typically list interactions with common, non-prescription pain relievers or cold medicines. A review with a healthcare provider is advisable for all concurrent medications.

Q: What is the risk of antibiotic resistance with Amoxistad plus?

A: The risk of antibiotic resistance increases if the patient misses doses or does not complete the full prescribed course of therapy. Official patient information stresses that following the prescribed duration is key to preventing bacteria from developing resistance to this and other antibacterial drugs.

How should Amoxistad plus be stored and disposed of?

How to Store and Dispose of Amoxistad plus

Storage requirements for Amoxistad plus (Amoxicillin/Clavulanate potassium) differ based on the product form to ensure stability.


Storage Conditions

Product State Temperature Requirement Protection Condition
Dry Powder or Tablets Controlled Room Temperature (20 C to 25 C) Keep tightly closed; protect from moisture.
Reconstituted Suspension Refrigerated (2 C to 8 C) Must be used or discarded within 10 days.

Handling and Disposal

The medicine must be stored in its original container and kept out of the sight and reach of children. The liquid suspension must be discarded after the 10-day stability period. Unused or expired product should be disposed of according to local regulatory requirements and should not be thrown into household waste or wastewater.

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

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