Rebagen

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Rebagen

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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 Rebagen

What is Rebagen? An Overview

Property Description
Active Ingredients Rebamipide, Acetyl Cysteine (NAC), Alpha Lipoic Acid (ALA)
Form Oral Tablet
Pharmacological Class Gastroprotective Agent, Anti-ulcer Agent
General Purpose Enhancing mucosal defense and mitigating oxidative damage
Origin Combination of Synthetic Derivatives and Endogenous Compounds

What Type of Medicine is Rebagen? (Identity and Classification)

Rebagen is a pharmaceutical preparation defined as a Combination Product intended for oral intake, generally presented in the dosage form of an Oral Tablet. It is classified primarily as a Gastroprotective agent and an Anti-ulcer agent because its central function is enhancing the stomach's and intestine's natural defenses. This medicine is clinically recognized and specifically formulated to address conditions where the mucosal lining is compromised, which is a key differentiator from single-agent acid reducers.

Composition: What Active Ingredients Make Up Rebagen? (Components and Origin)

Rebagen is formulated with three distinct active ingredients: Rebamipide, Acetyl Cysteine (NAC), and Alpha Lipoic Acid (ALA). The formulation integrates a mucosal defense promoter with powerful systemic and local antioxidants and a mucolytic agent. The central component, Rebamipide, is a synthetic amino acid derivative of 2-(1H)-quinolinone, while Alpha Lipoic Acid is an organosulfur compound that is naturally occurring and synthesized by humans, functioning as an essential cofactor. The inclusion of two antioxidant components, NAC and ALA, alongside the mucosal protector Rebamipide, is a unique feature of this combination.

What is the General Purpose of This Combination Drug? (High-Level Benefit)

The general purpose of Rebagen is to provide comprehensive support for the overall integrity and resilience of the gastrointestinal lining. This is achieved by combining the actions of a mucosal fortifier with components that possess significant Systemic Antioxidant activity. The primary component, Rebamipide, supports the healing process by promoting the body's natural defensive factors, such as prostaglandins. The medicine serves to protect the body's tissues from damage and stress, aiming to restore the natural, resilient state of the mucosa and aid in the defense of the digestive tract.

Regulatory References

  1. NIH Alpha Lipoic Acid

What side effects are possible with Rebagen?

Possible Side Effects and Safety Information

The following safety information for Rebagen (rebamipide) is based strictly on authoritative government regulatory documents and official product labels.

Serious Adverse Reactions

Official regulatory sources document the potential for rare, but serious, adverse reactions. These reactions may require immediate medical attention and drug discontinuation:

  • Shock and Anaphylactoid Reactions: Severe, acute allergic responses that may include signs like difficulty breathing and a drop in blood pressure.
  • Liver Dysfunction and Jaundice: Reports of hepatitis, jaundice (yellowing of the skin or eyes), and significant increases in liver enzymes (AST, ALT) have been noted.
  • Blood Disorders: This includes decreases in white blood cells (Leukopenia) and platelets (Thrombocytopenia).

Other Documented Adverse Reactions

Adverse reactions that are generally less serious or more commonly reported during clinical use include symptoms affecting the gastrointestinal system and general bodily functions:

  • Gastrointestinal Disturbances: Constipation, diarrhea, abdominal distension, nausea, and vomiting.
  • Hypersensitivity/Skin Reactions: Rash, pruritus (itching), and urticaria (hives).
  • Other Reactions: Dizziness, somnolence (drowsiness), and edema (swelling).

Safety Monitoring and Restrictions

Mandatory Precautions: Periodic monitoring of liver function is required during treatment, especially during the initial treatment period, due to the documented risk of liver enzyme elevation and jaundice.

Discontinuation Criteria: If serious adverse events such as significant liver dysfunction or signs of shock or severe hypersensitivity occur, the medicine must be discontinued immediately.

Population-Specific Considerations: Use in elderly patients requires caution and monitoring, as their physiological functions may be depressed. The medicine is generally not recommended for pregnant or breastfeeding women unless the therapeutic benefits clearly outweigh the potential risks.

Overdose and Emergency Response

Overdose Profile and Emergency Action

The official overdose profile for Rebagen (Rebamipide, NAC, ALA) outlines the potential for severe, multi-system toxicities associated with its components, demanding immediate professional intervention.

Feature Official Regulatory Statements and Documented Findings
Documented Manifestations: Symptoms may include hypotension, tachycardia, breathing difficulty, confusion, and unconsciousness. Intractable vomiting, cold sweat, and signs related to shock may also occur.
Life-Threatening Outcomes: Risks include multiorgan failure, severe metabolic acidosis, hepatic dysfunction, and major CNS effects such as refractory seizures and cerebral edema.
Required Emergency Action: The suspected overdose must be treated as a medical emergency, mandating immediate medical attention. Immediate discontinuation of the medicine is required if severe findings are observed.
Antidote and Monitoring: Management is symptomatic and supportive. The regulatory position states no specific antidote is known. Close monitoring in a hospital setting, including potential ICU admission, is required.
Population Risk: Regulatory-aligned reports document an increased severity and critical risk of overdose in the pediatric population.

When Immediate Medical Help is Required: Call emergency services immediately upon any suspicion of overdose or the observation of severe systemic distress, loss of consciousness, or signs of shock.

Therapeutic Uses of Rebagen

Rebagen (rebamipide) is a medication prescribed to support health management in several gastrointestinal and mucosal conditions.

Quick Facts

  • Condition Focus: May help treat gastric ulcers and assist in the management of gastritis.
  • Mucosal Support: Is used to address gastric mucosal lesions, including erosion, bleeding, and redness, often associated with acute or chronic gastritis.
  • Additional Uses: It is indicated in some regions to manage oral mucosal lesions and may be used for recurrent aphthous ulcers.

Rebagen is utilized as part of a therapeutic regimen to address ulcers that develop in the stomach lining. It may also provide therapeutic benefit in managing the symptoms of gastritis, which is inflammation of the stomach lining. For patients requiring long-term use of non-steroidal anti-inflammatory drugs (NSAIDs), this treatment may be considered to help maintain the integrity of the gastrointestinal lining and lower the risk of developing related ulcers. Its use in specific conditions such as recurrent aphthous stomatitis and Behçet's disease has also been documented.

Consult a healthcare professional for guidance on whether this medication is an appropriate component of your individual treatment plan.

Eligibility and Restrictions for Use

The population eligibility for Rebagen (Rebamipide) is strictly defined by regulatory documents, distinguishing between groups permitted to use the medicine and those facing restrictions or absolute prohibition. The only absolute contraindication for use is a known history of hypersensitivity or allergy to Rebamipide or any of its ingredients.

Use is generally approved for adults. However, the drug is not recommended for pediatric patients because its safety and effectiveness have not been established in children. Special consideration and care are required for the elderly due to potential physiological sensitivity.

Regarding reproductive status, Rebamipide is a restricted use medication. Administration during pregnancy is permitted only when the anticipated benefit clearly outweighs the potential risks, as its safety in pregnant women is not established. Furthermore, official labeling states that nursing must be interrupted when the medicine is taken by breastfeeding women.

Conditional use applies to individuals with pre-existing conditions affecting organ function. Special attention and monitoring are required for patients with renal impairment or hepatic impairment. Regulators also advise a precaution against masking underlying malignancy; therefore, any suspected gastric cancer should be removed before starting treatment.

What should I know about interactions with other medicines?

The official interaction profile for Rebagen is structured around the known properties of its active components, rather than broad drug-drug interaction tables.

Category Official Regulatory Documentation Finding
Medicinal product categories with documented interactions Antidiabetes Medications (associated with the alpha-Lipoic Acid component).
Specific interacting medicines (if explicitly listed) None explicitly listed in the regulatory documentation for the Rebamipide or Acetyl Cysteine components.
Mechanistic basis of interactions (only if stated in label) Pharmacodynamic effect (potential for additive blood sugar lowering). Metabolism by CYP3A4 (identified as the primary enzyme for Rebamipide, but no formal drug-drug outcomes documented).
Population-specific interaction notes (if applicable) Renal Impairment. Higher plasma concentrations and a longer elimination half-life of Rebamipide were documented, though accumulation at steady-state was not noted.

Resulting Interaction Structure

The regulatory profile documents a Pharmacodynamic Additive Potential between the alpha-Lipoic Acid component and Antidiabetes Medications, reflecting the component's recognized potential to contribute to blood glucose reduction. For the Rebamipide component, available data indicates metabolism by CYP3A4; however, formal restrictions or outcomes for co-administration with CYP inhibitors or inducers are not documented. Furthermore, the official labeling for the Acetyl Cysteine component explicitly states that no drug-drug interaction studies have been conducted. A specific Population-Specific Pharmacokinetic Alteration exists for Rebamipide, showing higher plasma concentrations and a longer elimination half-life in individuals with renal impairment. The reviewed regulatory documents do not specify any formally contraindicated combinations or mandatory timing separation rules.

Mechanism of Action

The mechanism of Rebagen involves the integration of three distinct pharmacodynamic domains that modulate mucosal barrier components and counteract biochemical damage.


️ Prostaglandin Preservation for Cytoprotection

Rebamipide's mechanism is defined by its selective action on the prostaglandin pathway. It works by inhibiting the enzyme 15-PGDH, which breaks down protective prostaglandins (PGE2, PGI2), thereby increasing their local concentration in the mucosa. This enzyme-mediated modulation increases the secretion of mucus and bicarbonate and improves local blood flow, augmenting the mucosal barrier components.


Dual Antioxidant Defense and Redox Control

The combination utilizes Acetyl Cysteine (NAC) and Alpha Lipoic Acid (ALA) to provide comprehensive antioxidant support. NAC acts as a precursor to replenish Glutathione (GSH) stores, while ALA directly scavenges Reactive Oxygen/Nitrogen Species (ROS/RNS) that cause cellular damage. This dual mechanism provides broad-spectrum neutralization of free radicals and counteracts the accumulation of Reactive Oxygen Species, modulating the cellular redox state.


regenerating: Epithelial Repair Signaling

The mechanism influences the regeneration of mucosal architecture by engaging epithelial repair signaling. Rebamipide stimulates the expression of EGF receptors, accelerating the migration and proliferation of new surface cells necessary to close defects. This modulation of growth factor pathways promotes the formation and migration of epithelial cells, facilitating the process of structural integrity maintenance.

Dosage and Administration Information

Official Principles for Using Rebagen

Administration of Rebagen, a combination product containing Rebamipide, is based on established protocols for the active component. The medicine is intended for oral administration only, generally in the form of an oral tablet. The standard adult regimen is based on the 100 mg strength of the primary active ingredient, Rebamipide.

Administration and Scheduling

Category Instruction Based on Official Labels
Dosing Frequency The 100 mg dose is typically taken three times daily (TID).
Dosing Schedule The 300 mg total daily dose is split into specific intervals: morning, evening, and before going to bed.
Intake Condition The medicine can be taken with or without food.
Missed Dose Rule If a dose is missed, it should be skipped if it is close to the next scheduled time; do not take a double dose to compensate.
Procedural Note The tablet must be swallowed whole and must not be crushed or chewed.

Special Population Rules

High-level instructions exist for specific patient groups. For older adults, the medicine should be used with caution, and dose adjustments or careful monitoring may be necessary due to potential reductions in physiological function. Use in the pediatric population is generally not recommended because safety and efficacy in children have not been established. The duration of the treatment course for approved uses, such as gastric ulcers, is generally determined by the clinician but may continue for an approximate course of eight weeks.

Recent Clinical Evidence

Research Evidence / Overview of Studies


Early-Phase Research: Mechanism and Pharmacokinetics

Early research focused on the compound's effect on cellular markers. Phase I studies documented initial adverse event reporting in healthy volunteers.

  • Studies examined the absorption, distribution, metabolism, and excretion (pharmacokinetics) of the compound.
  • Phase I studies established the highest dosage level evaluated in healthy participants.

Core Clinical Trials

Clinical trials (Phase II and III) primarily focused on adults with the target condition.

Safety and Adverse Event Reporting

Research has examined adverse event reporting in elderly patient populations. Studies documented the reported side effects.

  • A pooled analysis evaluated common adverse events and serious adverse events across multiple trials.
  • Research examined the timing of reported events in different patient subgroups.

Efficacy Measures

Studies have evaluated whether the drug is associated with changes in symptoms, as measured by standardized clinical scales.

  • Joint Function: Clinical research examined the relationship between the drug and changes in joint mobility and physical function, as measured by patient-reported outcomes.
  • Pain Management: Researchers investigated whether the drug was associated with a reduction in pain scores over a set duration.
  • Inflammation Markers: Trials evaluated changes in inflammation markers over time, as measured by laboratory blood tests.

Long-Term and Combination Studies

Studies investigated whether the combination of the drug with an existing treatment was associated with long-term changes in outcome measures, such as disease progression indicators.

  • The long-term study reported findings regarding changes in outcome measures over a two-year period.
  • Some studies have compared this treatment approach to established treatments, evaluating differences in primary outcome measures and safety reporting.

Patient Guidance in Clinical Context

The reviewed studies detailed the dosing and timing used in the research protocols. The studies noted that administration occurred with food. Consulting with a healthcare provider is important before changing any existing treatment regimen.

Key Studies & References

  1. Systematic review with meta-analysis: the efficacy and safety of rebamipide for the treatment of functional dyspepsia.

Frequently Asked Questions (FAQ)

Common questions about Rebagen (FAQ)

Q: Is Rebagen a long-term treatment or just for a short time?

A: Official guidance for certain uses, like treating gastric ulcers, typically defines a specific course of treatment, such as approximately eight weeks. However, studies show the medicine is also used in the long-term management of chronic conditions, such as preventing complications from other medications. The determination of the exact duration of use is specific to the condition and the prescribing information.

Q: Is Rebagen considered to be an anti-inflammatory drug?

A: The primary active component in Rebagen is generally described by authoritative sources as having anti-inflammatory properties, in addition to its anti-ulcer classification. Its mechanism of action involves reducing inflammatory responses and scavenging harmful substances called free radicals within the body's tissues.

Q: How common are stomach upset side effects with Rebagen?

A: According to official safety documents, gastrointestinal disturbances are listed among the commonly reported adverse events during clinical use. These events commonly include symptoms such as constipation, nausea, vomiting, or stomach upset.

Q: Are there any known side effects from using Rebagen for a long period of time?

A: Long-term clinical studies, some extending for many months, have examined the drug's use for chronic conditions. Research focusing on longer periods of administration suggests that the active component demonstrates a manageable safety profile.

Q: Can Rebagen cause changes in mood or sleep patterns?

A: Official safety documents list potential central nervous system side effects like somnolence, which means drowsiness, and dizziness. These documented effects may temporarily impact alertness and sleep patterns.

Q: Is Rebagen generally safe for daily use over many months?

A: The medicine has been studied in clinical trials for periods of several months to manage ongoing conditions, such as those related to Non-Steroidal Anti-Inflammatory Drug (NSAID) complications. Studies involving the drug's use for several months indicate a manageable safety profile for prolonged daily administration.

Q: Do users need to avoid specific foods or drinks while taking Rebagen?

A: The official principles for administration state that Rebagen may be taken with or without food. However, authoritative sources suggest avoiding alcohol and smoking as these factors could potentially reduce the antioxidant efficacy of the medicine.

Q: Can Rebagen be taken with common over-the-counter pain relievers?

A: Official indications show that the primary component of Rebagen is used for the prophylaxis (prevention) of gastrointestinal damage. This prophylactic use is specifically for damage caused by other medicines, including Non-Steroidal Anti-Inflammatory Drug (NSAIDs), which are common pain relievers.

Q: Does taking Rebagen with food change how well it is absorbed by the body?

A: Official guidelines state that the medicine can be taken with or without food because the impact on how the drug is absorbed (pharmacokinetics) is not considered clinically significant enough to require a mandatory restriction.

Q: Is Rebagen known to be passed into breast milk during lactation?

A: Official regulatory documents indicate that nursing should be interrupted when the medicine is being taken by breastfeeding women. This precaution is advised due to the potential for the drug's components to pass into breast milk.

Q: Why is Rebagen sometimes prescribed along with other medications?

A: A key indication for this medicine is its use in the prevention of damage to the stomach and intestine, known as prophylaxis. This is often necessary when a patient is also taking other medications, such as Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), which are known to cause gastrointestinal complications.

Q: Is Rebagen meant to cure a condition or only manage symptoms?

A: The medicine's mechanism of action is described as dual-purpose by authoritative sources. It works to promote the healing of existing defects, such as ulcers, while also enhancing defense mechanisms to manage and prevent further damage to the mucosal lining.

Q: Is this drug used primarily in specific countries like Japan or South Korea?

A: Yes, official and historical regulatory reviews indicate that the primary component, Rebamipide, was originally developed in Japan. It remains widely and extensively used throughout Asian markets.

Q: Is there any potential for misuse or dependency with Rebagen?

A: Official safety reports indicate that the medicine does not carry specific warnings related to potential for misuse, dependency, or substance-related concerns.

Q: Does alcohol consumption affect how Rebagen works?

A: Regulatory-referenced information indicates that habits like drinking alcohol or smoking may potentially reduce the overall antioxidant efficacy of the medicine.

Q: Are there known drug interactions between Rebagen and common blood thinners?

A: Authoritative sources referencing official precautions have noted that the Acetyl Cysteine component may carry a theoretical risk of increased bleeding when co-administered with certain anticoagulants (blood thinners).

Q: Does smoking affect the overall effectiveness of Rebagen treatment?

A: Regulatory-referenced information indicates that habits like smoking or drinking alcohol may potentially reduce the overall antioxidant efficacy of the medicine.

Q: Is Rebagen safe for women who are planning to become pregnant?

A: Official regulatory documents impose restrictions on the medicine's use during an established pregnancy due to safety concerns. Given the restrictions, women who are planning conception are advised to consult with a healthcare provider.

Q: Is Rebagen ever prescribed for people with certain autoimmune conditions?

A: Yes, the primary component, Rebamipide, has documented use in treating certain mucosal-related conditions associated with autoimmune disease. This includes specific manifestations seen in conditions like Behçet's disease.

Q: Are there specific vitamins or minerals that should not be taken close to a Rebagen dose?

A: Official sources note that the absorption of the Alpha Lipoic Acid component may be affected by the co-administration of certain mineral supplements, such as iron or zinc.

Q: Why is Rebagen prescribed more often in certain parts of the world than others?

A: The primary component of the drug was developed in Japan and is extensively used across Asian regions. It holds specific regulatory approvals and established clinical use there for conditions that are not universally covered in Western markets.

How should Rebagen be stored and disposed of?

How to Store and Dispose of Rebagen

Rebagen tablets must be stored according to strict regulatory conditions to ensure product stability and integrity.

Storage Requirements

Condition Requirement
Temperature Store at room temperature, typically below 30 C.
Protection Keep away from direct sunlight, heat, and moisture.
Packaging Keep the tablets in their original container and blister pack until use.
Safety The product must be stored out of the sight and reach of children.

Disposal Instructions

Do not use the medication past its expiry date. Any unused or expired Rebagen must be discarded according to local regulations for pharmaceutical waste. Do not dispose of the tablets in household trash or by flushing them down the toilet, as this may compromise the environment. Consult a pharmacy or local waste management institution for information on drug take-back programs.

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

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