Raxar

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Medically reviewed

Rosario Oropesa

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 Raxar

Quick Facts about Raxar

Property Description
Active ingredient Domperidone
Forms Tablet, Oral suspension, Suppository
Pharmacological class Dopamine Antagonist, Prokinetic Agent
General purpose Relief from nausea and vomiting
Origin Synthetic organic small molecule

What is Raxar: Active Ingredient and Pharmacological Class

Raxar is a medicinal preparation containing the active ingredient Domperidone, which is fundamentally classified as a Dopamine Antagonist and a Prokinetic Agent. Domperidone is a synthetic organic small molecule that is clinically recognized for its action primarily outside the central nervous system, making it a peripherally acting agent. Its pharmacological class indicates a specific therapeutic action: it works by blocking the action of dopamine receptors, primarily the D2 and D3 types, which are responsible for transmitting signals that cause sickness and inhibit gut movement.


General Purpose and Anti-Emetic Function

The general purpose of Raxar is to provide effective relief from the symptoms of nausea and vomiting. Its classification as a prokinetic agent means it works by actively increasing the movements, or peristalsis, of the stomach and upper intestine. This property encourages faster gastric emptying, which helps alleviate discomfort associated with slowed digestion. Its function is to address both the sensation of nausea and the underlying physical movement of the digestive tract.


Available Forms and Administration Type

Domperidone is produced as a single active ingredient product and is available in several distinct pharmaceutical preparations, including the standard tablet, as well as oral suspension (liquid), and suppository forms. This wide range of options is a key differentiator, as it allows the medicine to be delivered via the general oral route (for tablets and suspension) or the rectal route (for suppositories). This flexibility in administration is a defining feature of the Domperidone formulation.

Regulatory References

  1. NIH: Domperidone Literature Review

What side effects are possible with Raxar?

The official safety profile for Raxar, which contains Domperidone, establishes both common, non-serious reactions and rare, but serious, cardiovascular risks, as classified by government regulatory authorities.

Frequency and Organ System Classification

Adverse effects are categorized by frequency, based on regulatory standards. Common effects (may affect up to 1 in 10 people) typically involve dry mouth and headache. Uncommon reactions (may affect up to 1 in 100 people) include drowsiness, anxiety, diarrhoea, and effects on the reproductive system such as galactorrhoea and breast pain/tenderness. Effects such as Extrapyramidal Disorder and severe hypersensitivity reactions like angioedema are listed as Very Rare [Source 2.3].

Serious Cardiovascular and Endocrine Safety

Regulatory warnings highlight the association of Domperidone with an increased risk of Serious Ventricular Arrhythmias and Sudden Cardiac Death. These rare but critical events are linked to the potential for QTc prolongation (an alteration of the heart's electrical activity) [Source 1.1, 2.6]. The risk is generally considered higher with daily doses greater than 30 mg, in patients older than 60 years, and with longer treatment duration. As a dopamine antagonist, the medicine may also cause effects related to elevated prolactin levels (hyperprolactinemia), leading to conditions like gynaecomastia [Source 1.4, 2.3].

Regulatory Restrictions and Contraindications

Official prescribing information mandates that Domperidone is contraindicated (must not be used) in patients with moderate or severe hepatic (liver) impairment, underlying cardiac diseases such as congestive heart failure, existing QTc prolongation, and significant electrolyte disturbances. The medicine is also restricted in its duration of use, usually not exceeding one week [Source 1.1, 3.2]. These constraints define the limits of the medicine’s use as defined by official regulatory bodies.

Overdose and Emergency Response

Overdose and When to Seek Help — Official Regulatory Information for Raxar

Raxar (grepafloxacin) has been withdrawn from the global market due to an unacceptable risk of severe, life-threatening cardiovascular adverse events. The regulatory concern regarding overdose and serious toxicity is solely focused on the potential for cardiac repolarization abnormalities.

Overdose Scope

  • Documented Overdose Presentations: The critical documented manifestation of toxicity involves the prolongation of the QTc interval, a measure of the heart's electrical repolarization time. This can lead to a specific type of potentially fatal ventricular arrhythmia known as Torsades de Pointes (TdP).
  • Physiological System Affected: The cardiovascular system is the primary system of concern regarding acute toxicity.
  • Emergency Response Statements: Due to the risk of severe cardiac events, immediate medical attention is required for any suspected overdose or instance of excessive exposure. Given the nature of the toxicity, standard emergency medical protocols for severe cardiotoxicity should be initiated.

Overdose Severity and Regulatory Basis

  • Severity Classification: The risk is implicitly classified by regulatory agencies (including the US FDA) as severe and potentially fatal, which led to the drug's voluntary withdrawal from the market in 1999.

Connection to the Overall Overdose Profile

The regulatory profile of Raxar's overdose risk is defined by its inherent cardiotoxicity, which caused its market withdrawal. Official documents emphasize the danger of cardiac repolarization effects and the resultant risk of life-threatening arrhythmias. Therefore, any exposure beyond therapeutic use represents an urgent medical emergency due to this established, dose-related cardiotoxic risk.

Therapeutic Uses of Raxar

Main Uses of Raxar

Raxar (grepafloxacin) is a synthetic broad-spectrum antibacterial agent belonging to the fluoroquinolone class. It was developed to treat a variety of bacterial infections caused by susceptible strains of microorganisms. The medication works by inhibiting the enzymes necessary for bacterial DNA replication, transcription, repair, and recombination.

Respiratory Tract Infections

Raxar was primarily indicated for the treatment of acute bacterial exacerbations of chronic bronchitis. It was also used to treat community-acquired pneumonia, including cases caused by common respiratory pathogens such as Streptococcus pneumoniae and Haemophilus influenzae.

Upper Respiratory Infections

The medication was used in the management of acute bacterial sinusitis, targeting infections in the nasal passages and sinuses that did not respond to simpler treatments.

Sexually Transmitted Infections

Raxar was indicated for the treatment of uncomplicated gonorrhea (urethral in males and endocervical in females) caused by Neisseria gonorrhoeae. It was also utilized for the treatment of nongonococcal urethritis and cervicitis caused by Chlamydia trachomatis.

Benefits and Clinical Utility

Broad-Spectrum Activity

One of the primary benefits of Raxar was its efficacy against both Gram-positive and Gram-negative bacteria. It demonstrated significant activity against atypical pathogens, which are often involved in respiratory tract infections.

Pharmacokinetic Profile

Raxar was designed with a pharmacokinetic profile that allowed for once-daily dosing. This simplified regimen was intended to assist in patient adherence to the full course of therapy, which is critical in the effective treatment of bacterial infections and the prevention of antibiotic resistance.

Tissue Penetration

The medication achieved high concentrations in various tissues and fluids, particularly in the lungs and respiratory secretions, making it a targeted option for lower respiratory tract infections.

Eligibility and Restrictions for Use

This information is derived strictly from official regulatory labeling and outlines the formal patient populations eligible or non-eligible to use Raxar (grepafloxacin).

Contraindications and Exclusions

Raxar is formally contraindicated in patients with:

  • A history of hypersensitivity to grepafloxacin or any other medicine belonging to the quinolone class.
  • Known QT c prolongation (a specific heart rhythm abnormality).
  • Hepatic failure (severe liver impairment).
  • Concomitant use of medications known to produce an increase in the QT c interval, unless continuous cardiac monitoring is assured (e.g., in a hospitalized setting).

Use in Special Populations

The safety and effectiveness of Raxar have not been established in:

  • Pediatric patients and adolescents (individuals under 18 years of age).
  • Pregnant women (FDA Pregnancy Category C).
  • Lactating women (the drug is known to be excreted into human milk, necessitating a decision to discontinue nursing or discontinue the medication).

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents define the interaction profile of Raxar (Domperidone) primarily through its metabolism and potential for additive cardiac effects.

Documented Interaction Restrictions

Classification Constraint Basis in Regulatory Data
Contraindicated Combinations Prohibited co-administration with potent CYP3A4 inhibitors and medicines that prolong the QTc interval (e.g., specific antiarrhythmics, antibiotics, and antipsychotics). Risk of increased Domperidone exposure and serious ventricular arrhythmia.
Population-Specific Use is formally contraindicated in patients with moderate or severe hepatic impairment. Altered clearance kinetics in this population.
Timing-Based Separation Antacids or antisecretory agents must not be taken simultaneously with Raxar. Prevents reduced oral bioavailability due to altered gastric acidity.

Pharmacokinetic and Pharmacodynamic Effects

Domperidone is principally metabolized via the Cytochrome P450 3A4 (CYP3A4) enzyme pathway. The concurrent use of potent inhibitors of this enzyme, such as certain antifungals or macrolide antibiotics (e.g., Ketoconazole, Erythromycin), is documented to significantly increase the plasma concentration of Domperidone. Additionally, co-administration with anticholinergic drugs may result in a pharmacodynamic interaction that antagonizes Raxar’s intended prokinetic effect. Official guidance also cautions against the co-administration of Grapefruit Juice and Alcohol due to the potential to increase the risk of adverse effects.

Mechanism of Action

How Raxar Works

Raxar targets the enzymatic processes required for replication and viability of susceptible microbial cells. This action is mediated through targeted inhibition of essential bacterial enzymes.


Targeting Microbial DNA Enzymes

This domain covers Raxar’s primary biological targets: the bacterial enzymes DNA gyrase (a type of topoisomerase II) and topoisomerase IV. Raxar operates by serving as an inhibitor of these targets, interfering with their critical roles in managing the physical structure and coiling of the microbial DNA.


Disrupting Genetic Processes and Cell Division

The inhibition of these enzymes initiates a mechanistic cascade that prevents the microbe from successfully replicating or repairing its genetic material. This sustained genetic damage results in a failure to complete the essential process of cell division, thereby inducing the destruction of the microbial cell. This action results in a bactericidal (cell-killing) effect, causing the reduction of the viable microbial population throughout the system.

Dosage and Administration Information

How to Use Raxar: Official Administration Guidelines

Raxar is administered according to specific, standardized instructions to ensure proper use and dosing control. The guidelines cover the available routes, precise dosing schedules, and duration of use, which must be strictly followed.

Administration and Dosing

The medicine is available in several forms, enabling administration via the oral route (tablets and suspension) or the rectal route (suppositories). The standard regimens are defined by age, weight, and the form being used, with strict limits on daily intake.

Administration Detail Official Regulation Summary
Standard Oral Dose 10 mg per dose for adults and adolescents weighing at least 35 kg.
Maximum Daily Dose 30 mg total per day (oral route).
Dosing Frequency Up to three times per day (TID) for oral forms, with intervals of 8 hours between doses.

Practical Instructions and Duration

Instructions specify that Raxar should be taken before meals (e.g., 15 to 30 minutes prior) because food can delay its absorption. If a dose is missed, it must be omitted, and the patient should resume the next scheduled dose without taking a double quantity.

Treatment must be limited in duration; guidelines specify that the medicine should be used at the lowest effective dose for the shortest time, generally not exceeding one week (7 days) in total.

For specific populations, such as those with severe renal impairment, the dosing frequency must be reduced (e.g., to once or twice daily) to accommodate physiological requirements.

Recent Clinical Evidence

Research evidence / Overview of Studies for Raxar (Domperidone)

Evidence for Use in Acute Nausea and Vomiting

Research has explored how symptoms change over time in short-term randomized controlled trials (RCTs) applied in studies examining patient-reported experiences of nausea and vomiting. These studies were generally conducted in adult populations, with outcomes monitored focusing on the frequency of nausea symptoms and the number of vomiting episodes over brief periods. Studies monitored outcomes related to symptom intensity or variability in the observed adult populations. This evidence is generally described by regulatory reviews as evidence supporting the evaluation for short-term symptom monitoring.

Research evaluating the use in children and adolescents is less extensive. Data for these groups remain insufficient, and evidence quality varies across studies, with findings sometimes described as mixed or inconsistent. Long-term outcomes are not fully established.


Evidence for Use in Chronic Stomach Motility Symptoms

Research examined outcomes related to Raxar in adults with conditions characterized by fluctuating or episodic manifestations, such as gastroparesis and functional dyspepsia. Study types include comparative trials, systematic reviews, and longitudinal observational cohort studies. Outcomes focused on patient-reported outcomes describing perceived discomfort related to chronic symptoms like bloating, fullness, and early satiety.

While some observational data contributed to understanding symptom patterns over several months, the evidence base is associated with research limitations. The certainty remains low for the evidence, as high heterogeneity exists among studies, follow-up durations were limited in many trials, and there is limited information for long-term outcomes.


Studies Addressing Specialized Populations

Research explored use in specialized contexts, including supportive therapeutic use for breastfeeding women and studies focusing on adolescents. Studies monitored outcomes such as the daily volume of expressed breast milk. The total number of participants in this research is relatively small, and this context is not an authorized indication in major regulatory jurisdictions. Research does not determine whether an individual will respond similarly to the group patterns reported in the studies.

Key Studies & References

  1. Domperidone for nausea and vomiting: lack of efficacy in children; reminder of contraindications in adults and adolescents - GOV.UK (MHRA Safety Update 2019)
  2. A systematic review of the efficacy of domperidone for the treatment of diabetic gastroparesis (2010)

Frequently Asked Questions (FAQ)

Common questions about Raxar (FAQ)

Q: How long does it typically take for Raxar to start having an effect?

According to the official product information, the onset of action for Raxar (domperidone) is generally reported to be between 30 and 60 minutes after taking the medicine orally. This time frame indicates when the therapeutic action may start in the body, although individual responses can vary.

Q: Are there any known long-term side effects associated with Raxar use?

Official regulatory warnings emphasize that the risk of serious heart problems, specifically ventricular arrhythmias or sudden cardiac death, is associated with longer treatment duration and doses above 30 mg per day. For this reason, official guidance emphasizes that the medicine should be used for the shortest possible duration.

Q: Are there specific side effects reported more often in women or men who take Raxar?

Adverse reactions related to an increase in prolactin (a hormone) can cause gender-specific effects. These may include breast enlargement (gynecomastia) in men, and breast pain/tenderness or unusual discharge in women. These effects are listed in the official adverse reaction data.

Q: Is Raxar safe for use in older adults?

Regulatory information indicates that the risk of serious heart-related adverse events is observed to be higher in patients older than 60 years compared to younger individuals. Official prescribing information advises that Raxar should be used with caution in this older population.

Q: Are there contraindications for Raxar in people with known kidney issues?

While the presence of kidney issues is not a blanket contraindication, official guidance requires attention for certain patients. For those with severe renal impairment (a serious kidney condition), the official prescribing information states that the dose frequency must be reduced.

Q: Where can I find the official regulatory documents for Raxar, like the prescribing information?

Authoritative information, such as the Summary of Product Characteristics (SmPC) or the Product Monograph, is publicly available. These documents are published on the websites of governing health authorities, including the EMA, Health Canada, and MHRA.

Q: Is Raxar approved by major regulatory bodies like the FDA or EMA?

Raxar (domperidone) is authorized by national health authorities in most countries belonging to the European Union (EMA), Canada, and Australia. It is important to note that it is not approved for general use by the United States FDA.

Q: Are there official warnings about operating machinery or driving while taking Raxar?

The official product information lists side effects such as dizziness and drowsiness as possibilities. Official warnings state that caution should be exercised if operating machinery or driving a vehicle.

Q: What are the differences between Raxar and similar medications for the same condition?

Raxar (domperidone) is described as a peripherally selective dopamine antagonist. This means it primarily acts outside of the brain and minimally crosses the blood-brain barrier. This action is consistent with a lower reported incidence of certain central nervous system (CNS) effects when compared to some other medicines in the same class.

Q: Is Raxar a new or a well-established medicine?

Raxar (domperidone) is considered a well-established medicine. It was first authorized and has been in use in most European countries since the 1970s, though its regulatory status has undergone recent restrictions.

Q: Is a generic version of Raxar currently available?

Yes, the active ingredient in Raxar, domperidone, is widely available as a generic medicine. It is manufactured and sold by various companies under multiple trade names globally.

Q: Are routine lab tests or monitoring required while taking Raxar?

Official monitoring guidance specifies the need for a baseline ECG (a test of the heart’s electrical activity) prior to starting treatment. Regular ECG monitoring and assessment of electrolyte levels are designated for certain patients who are on higher doses or prolonged therapy.

Q: Is Raxar classified as a controlled substance?

No, Raxar (domperidone) is legally classified as a Prescription-only Medicine (POM) in major international jurisdictions. It is not classified as a controlled substance.

Q: Does Raxar interact with common over-the-counter pain relievers?

Official guidance includes the recommendation that patients inform a healthcare professional about all medicines being taken, including over-the-counter pain relievers. This is because certain combinations of drugs can affect each other and potentially increase the risk of side effects.

Q: Does Raxar interact with herbal supplements like St. John's Wort or Ginkgo?

Official information states that there is often not enough information to confirm that all herbal remedies and supplements are safe to take with Raxar. Official guidance notes that the use of supplements should be disclosed to a healthcare professional.

Q: Can Raxar be safely taken with standard daily vitamins and minerals?

Health authority documents state that informing a healthcare professional about all supplements, including standard vitamins and minerals, is a necessary part of the patient history when treatment is started. This ensures that the full picture of concurrent use is considered.

Q: Is Raxar considered safe for patients who also have diabetes?

For patients with conditions like diabetic gastroparesis, official guidance notes that the cardiac risks associated with Raxar must be carefully weighed against the therapeutic benefits. The official guidance indicates that specialized clinical assessment is necessary when considering use in this group.

Q: Does Raxar contain common allergens like lactose or gluten?

The full list of inactive ingredients, known as excipients, is detailed in the Product Monograph or Data Sheet for a specific formulation. Some versions of Raxar may contain common substances like lactose or wheat starch (a source of gluten) depending on the manufacturer.

How should Raxar be stored and disposed of?

Official Storage and Disposal Guidelines

The storage and disposal requirements for Raxar (tedizolid phosphate) are defined by official government regulatory agencies for both the tablet and intravenous (IV) formulations.


Storage Requirements

Attribute Tablet (Oral) Powder for Concentrate (IV)
Temperature Store at room temperature. Does not require special storage.
Protection Must be kept in a closed container, away from heat, moisture, direct light, and freezing temperatures. Avoid vigorous shaking during or after reconstitution.
Child Safety Keep out of the reach of children. (Standard hospital handling)

Disposal

  • The IV Powder for Concentrate contains no antimicrobial preservatives and is for single use only; any unused portion must be discarded.
  • Do not keep outdated medicine or medicine no longer needed. Consult a healthcare professional on how to properly dispose of unused medicine.
  • The official disposal profile states no special requirements for waste material derived from the product.

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

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