Benzro

Quick links to important sections

Benzro

Method of action: Hypouricemic, Uricosuric

Treatment option: Gout

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.

Overview of Benzro

Property Description
Active Ingredient Benzbromarone
Form Oral Tablet
Pharmacological Class Uricosuric Agent (Antigout Preparation)
Primary Action Enhances uric acid excretion
Origin Synthetic Benzofuran Derivative

What Type of Medicine is Benzro? (Identity, Class, and Purpose)

Benzro is the trade name for a synthetic, prescription-only medication whose active component is Benzbromarone. It is formally classified as a uricosuric agent, a functional component of the broader class of antigout preparations. The fundamental purpose of Benzro is to address hyperuricemia, which is the state of having persistently high levels of uric acid in the bloodstream. Benzbromarone is utilized for its potent ability to enhance the elimination of uric acid. This makes it a therapy for patients requiring consistent, long-term control over elevated serum urate levels.


Benzro's Composition and Pharmaceutical Form (Substance, Origin, and Form)

The sole active ingredient in Benzro is Benzbromarone, a single compound characterized as a benzofuran derivative that is produced via chemical synthesis. The precise molecular formula for this synthetic substance is C17H12Br2O3. The medicine is manufactured and typically administered via the oral route in the form of a compressed tablet, making it a conventional dosage form for systemic use. Uricosuric agents like this one are intended to modify the body’s physiological handling of urate, which distinguishes it from simpler anti-inflammatory medicines.


How Does a Uricosuric Agent Generally Help? (High-Level Purpose and Benefit)

A uricosuric agent like Benzro helps by directly enhancing the body’s natural elimination of the waste product uric acid. The medication achieves this by working in the kidney tubules to block the reabsorption of uric acid back into the blood, resulting in more of the substance being passed out in the urine. This action involves a direct impact on renal urate transporters. The resulting systematic lowering of the overall urate burden is the goal for effective long-term management of hyperuricemia.

Regulatory References

  1. NIH StatPearls: Hyperuricemia

What side effects are possible with Benzro?

Possible Side Effects and Safety Information

The safety profile of Benzro, whose active ingredient is Benzbromarone, is primarily defined by effects on the digestive system and specific regulatory warnings concerning liver function.

Officially Documented Adverse Reactions

Adverse reactions listed in official regulatory documents are often categorized by the system-organ class affected. Common and less serious effects predominantly involve the Gastrointestinal System (e.g., stomach discomfort, loose stools, or diarrhea) and the Hepatobiliary System, often seen as elevated liver enzymes.

Classification (by Regulatory Labels) System-Organ Class Examples as Classified
Common Gastrointestinal, Hepatobiliary Diarrhea, elevated liver enzymes
Uncommon Skin and Subcutaneous Tissue Rash, pruritus (itching)

Serious Adverse Reactions and Safety Constraints

The most serious safety concern documented in regulatory reports is the potential for severe hepatic function disorder, including reports of fulminant hepatitis and hepatic failure, which in some instances have been fatal. Official labeling also documents rare instances of severe hematological events such as agranulocytosis.

Safety constraints restrict the use of Benzro in specific populations. The medicine is contraindicated in individuals with severe hepatic disease due to the risk of serious hepatotoxicity. Use is also generally contraindicated in patients with severe renal impairment.

Regulatory documents note that these serious hepatic events have been reported to occur mainly within the first six months of initial administration. Additionally, aggravation of gout symptoms (gout flares) is a documented pattern that may occur at the start of treatment due to the rapid mobilization of uric acid.

Overdose and Emergency Response

The official regulatory profile for Benzro is primarily defined not by acute, symptomatic overdose but by the potential for severe, life-threatening organ toxicity associated with drug exposure. Regulatory documentation highlights the significant risk of developing Acute Liver Failure, an outcome which has been associated with the potential for death or the necessity for emergency liver transplantation.

Overdose Scope Official Regulatory Findings
Documented Manifestations Jaundice, Fatigue, and a hepatocellular pattern of enzyme elevations (High ALT/AST).
Affected System Hepatic system (Liver).
Severity Classification Life-threatening (associated with Acute Liver Failure).

When to Seek Immediate Medical Help:

Regulatory statements mandate that an individual seek immediate medical attention if any clinical signs of severe toxicity are suspected, particularly the onset of Jaundice or unusual Fatigue. The required emergency action includes the immediate and mandatory discontinuation of the medication.

Management procedures are officially constrained by the lack of a specific antidote for Benzro toxicity. Treatment is therefore limited to general symptomatic and supportive measures. Due to the life-threatening severity of the potential outcome, intensive hospital monitoring may be required, focusing primarily on the frequent assessment of Liver Function Tests (LFTs). Official regulatory summaries do not explicitly document population-specific considerations for this severe toxicity scenario.

Therapeutic Uses of Benzro

What Benzro Treats: Main Uses and Benefits

Benzro (active ingredient benzbromarone) is considered relevant for managing the systemic imbalance that underlies hyperuricemia (excessive uric acid in the blood). The medication is commonly used to help with conditions characterized by periods of heightened symptoms, such as the recurrent pain and inflammation associated with gout. Its use is applied in addressing the systemic imbalance that causes elevated uric acid levels. This therapeutic approach is relevant for easing the symptoms that create noticeable physiological strain associated with chronic, elevated uric acid levels.

This approach supports general well-being during symptomatic phases by contributing to easing the overall symptom load. The compound is primarily used to treat gout and hypertension accompanied by hyperuricemia.

“This approach may assist with maintaining functional stability during episodes of increased discomfort.”

In these scenarios, Benzro assists with maintaining functional stability when symptoms interfere with routine activities.


Quick Fact: Helps address symptoms related to physical discomfort (gout flares) and systemic imbalance (hyperuricemia).

Regulatory References

  1. Drug Information Sheet for Benzbromarone (Japan)

Eligibility and Restrictions for Use

Benzro is approved for use in adults who require long-term management for hyperuricemia or chronic gout. Its eligibility profile is strictly defined by regulatory documents, excluding populations with specific health conditions or life stages.


Contraindicated Populations

Benzro is contraindicated and must not be used by the following groups:

  • Patients with severe renal impairment (typically defined as eGFR < 20 mL/min). Mild to moderate renal impairment requires cautionary use and monitoring.
  • Individuals with a history or predisposition for kidney stone formation (urolithiasis), as the medicine may increase the risk of uric acid stones.
  • Patients with a pre-existing liver disorder due to the rare, but serious, risk of hepatotoxicity.
  • Women who are pregnant.

Restricted and Non-Recommended Use

  • Pediatric Use: Safety and effectiveness have not been established in children and adolescents, and therefore use is not recommended.
  • Lactation: Use in breastfeeding women is not recommended due to a lack of adequate human safety data.
  • Acute Gout: Benzro is a chronic urate-lowering therapy and is contraindicated for the treatment of an acute gout attack.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Benzro (Benzbromarone) is defined by official regulatory documentation concerning pharmacokinetic, pharmacodynamic, and contraindicated combinations.


Contraindicated Combinations and Key Restrictions

Co-administration with potentially hepatotoxic drugs must be strictly avoided. This restriction applies to substance classes known to carry a risk of liver injury, including medicines such as tuberculostatics. This restriction is reinforced by the general constraint against using Benzro in patients with a pre-existing liver disorder.

Interactions Affecting Drug Exposure

Benzbromarone is documented as an inhibitor of the Cytochrome P450 2C9 (CYP2C9) enzyme. This pharmacokinetic activity can lead to a clinically significant interaction by increasing the systemic exposure of medicines metabolized by this pathway. Specifically, Benzro may increase the anticoagulant effect of Coumarin Anticoagulants, such as Warfarin. Due to this risk of increased exposure, the official regulatory information mandates the close monitoring of therapy using the INR or Quick value during co-administration with these anticoagulants.

Pharmacodynamic and Efficacy Interactions

The uricosuric effect of Benzro may be attenuated when taken concurrently with certain other medications. This antagonistic interaction is documented with both Salicylates and the sulfonamide derivative Sulfinpyrazone, potentially reducing the intended action of Benzro. No specific interaction warnings with food, alcohol, or herbal products are explicitly listed in the official regulatory documentation.

Mechanism of Action

Molecular Mechanism: Blockade of Urate Reabsorption

Benzbromarone exerts its primary effect by acting as a non-competitive inhibitor of the URAT1 transporter ( SLC22A12), which resides on the renal proximal tubule cells. By binding to and functionally blocking this specific transporter, the drug directly prevents the reabsorption of filtered uric acid from the tubular fluid back into the bloodstream.


Cascade: Enhanced Renal Urate Excretion

The physical blockade of URAT1 initiates a mechanistic cascade that results in a significant increase in the fractional excretion of uric acid ( FEUA). This sustained increase in renal clearance alters the systemic balance, leading to a net loss of urate from the body and the resulting physiological consequence: a measurable, continuous reduction in serum urate levels ( sUA).


Sustained Action through Active Metabolite

The prolonged effectiveness of this mechanism is supported by the drug’s primary breakdown product, 6-hydroxybenzbromarone, which is itself an active uricosuric agent. This active metabolite continues to inhibit the urate transporters for an extended period, providing a synergistic and sustained blockade that contributes to the overall reduction in systemic urate concentration over time.

Dosage and Administration Information

How to Use Benzro

Benzro (Benzbromarone) is administered exclusively through the oral route as a 50 mg scored tablet. The medication involves specific administration procedures necessary for its long-term use, focusing on dose management and essential intake conditions.

Standard Dosing and Schedule The standard regimen begins with an initial dose of 25 mg or 50 mg, taken once daily. This initiation requires gradual titration before transitioning to a maintenance dose range of 50 mg to 100 mg once daily. Doses should be taken at the same time each day, with or immediately after a meal. For a missed dose, the instruction is to take it when remembered, unless it is almost time for the next scheduled dose, in which case the missed dose should be skipped without doubling the amount.

Essential Co-Administration Protocols The correct use of Benzro is dependent on supporting procedures. Administration requires ample fluid intake, aiming for a high daily urinary output of 1.5 to 3 litres of water. Furthermore, the use of urine-alkalizing agents to achieve and maintain a specific urine pH is considered essential for proper use, particularly during the starting phase of treatment. The use protocol also advises the avoidance of purine-rich foods and alcohol.

Procedural Constraints Therapy is intended for long-term control and should not be started during an acute symptom episode but only after the acute phase has subsided. The medication is generally constrained for use in individuals with severe renal impairment (e.g., eGFR below 20 mL/min).

Recent Clinical Evidence

Research evidence / Overview of studies for Benzro


Evidence for Use in Hyperuricemia (High Uric Acid Levels)

Research has primarily focused on Benzro in relation to managing hyperuricemia, a condition marked by persistently high levels of uric acid in the blood. Studies conducted include short-term randomized controlled trials (RCTs) and various observational cohort studies. These studies primarily monitored changes in the key biological marker: serum urate (sUA) concentration.

Findings describe patterns observed in the studies, where measured decreases in sUA levels were noted during the study period. Research explores the relationship between the medicine and achieving the sUA target level often studied in connection with long-term management. What remains unclear is the full long-term picture beyond the initial six months, as large-scale, high-quality RCTs tracking clinical outcomes (like kidney or heart health) are still emerging.


Evidence for Use in Gout Management

Since high uric acid is recognized as the underlying factor in gout, research explored Benzro in relation to the clinical events associated with the condition. The studies focused on outcomes related to physical discomfort and episodic changes. The main outcomes monitored were the frequency of gout flares (attacks) and the size of tophi (uric acid deposits) over the observation period.

Studies described patterns where a lower incidence of gout flares was tracked in participants who achieved and maintained lower sUA levels, consistent with the recognized relationship between the biochemical marker and clinical events. The data for long-term clinical outcomes in gout are still emerging. As sUA reduction is an established goal in gout management, the long-term effects are not fully established regarding the treatment in relation to outcomes like joint integrity or patient-reported quality of life.


Research Gaps and Areas of Uncertainty

Evidence quality varies across studies, and many reports rely heavily on surrogate endpoints, such as sUA level measurements, rather than tracking harder, long-term clinical outcomes. Follow-up durations were limited in many controlled studies, meaning there is limited information for the durability of the measured pattern. Furthermore, comparative evidence is lacking against all contemporary urate-lowering agents in large, Western-led RCTs. Overall, the research provides context but not individual predictions, and the findings describe group patterns, not personal outcomes.

Key Studies & References

  1. Benzbromarone - LiverTox - NCBI Bookshelf (Regulatory and Safety Summary)
  2. Lessons to be learned from real life data based on 98 gout patients using benzbromarone

Frequently Asked Questions (FAQ)

Common questions about Benzro (FAQ)


Q: Is Benzro the same type of medicine as [similar common drug name]?

Benzro is classified as a uricosuric agent. This means it works by increasing the amount of uric acid the body gets rid of through the urine.

Its official designation helps to explain its specific mechanism of action compared to other types of medicines used for similar conditions.


Q: How quickly does Benzro start to work?

Pharmacokinetic data indicates that the medicine is quickly absorbed into the body after it is taken. While the main compound has a short half-life, its primary breakdown product remains active for up to 30 hours, which is described as contributing to a prolonged activity in the body.


Q: Is Benzro known to cause sleep problems?

Official safety documentation notes that dizziness and headache are potential side effects. However, specific sleep problems are not listed as common adverse events. Fatigue has been reported as a symptom in rare cases of severe liver function disorder, which is a serious safety concern.


Q: Why is Benzro sometimes described as a 'novel' treatment?

Benzro is noted as a specific type of drug called a benzofuran derivative. Its mechanism of action involves non-competitive inhibition of the URAT1 transporter in the kidney, which is a specific, distinct way of lowering uric acid compared to some older treatments.


Q: Is it okay to drive or operate machinery while taking Benzro?

Official product information contains specific instructions regarding the effects of the medicine on the ability to drive and operate heavy machinery.

Detailed guidance on this topic is found within the safety information provided by a healthcare professional or pharmacist.


Q: Does Benzro interact with commonly used over-the-counter pain relievers?

Official drug interaction information indicates that the effectiveness of Benzro may be lessened when it is taken concurrently with Salicylates.

Salicylates are a class of common non-prescription and prescription pain relievers. Official information highlights the importance of discussing all co-administered medicines with a healthcare provider.


Q: Do studies suggest Benzro is effective for long-term use?

Research includes studies tracking the drug's effect on uric acid levels. However, long-term studies designed to track the durability of the effect and overall clinical outcomes are still considered to be emerging.

Short-term randomized controlled trials have been conducted to evaluate its effectiveness in reducing uric acid levels.


Q: Is it common to feel tired after starting Benzro?

Tiredness or fatigue may occur as a symptom of liver issues, which is a rare but serious safety concern that can potentially arise during the first six months of treatment.

Information emphasizes the importance of understanding the signs of liver issues.


Q: Are there known interactions between Benzro and birth control pills?

Benzro is documented as an inhibitor of the CYP2C9 enzyme, which is responsible for metabolizing certain medicines. This activity may increase the systemic exposure of other medicines metabolized by this pathway, which could potentially include certain hormonal contraceptives.


Q: Is it possible to be allergic to an ingredient in Benzro?

Regulatory information indicates that the medicine is contraindicated in case of hypersensitivity (allergy) to the active substance (Benzbromarone) or to any of its inactive ingredients (excipients).

Official documentation notes that the product is contraindicated for use if a patient has known hypersensitivity to any of its components.


Q: How is the safety of Benzro monitored after it is released to the public?

Official labeling describes the requirement for regular monitoring of liver function through blood tests. This is due to the documented potential for severe hepatic adverse events (liver problems).

This monitoring is typically described as being recommended during the first six months of therapy, where serious hepatic events have been most commonly reported.


Q: Can Benzro be taken with other heart medications?

Official information indicates that Benzro may increase the effect of Coumarin Anticoagulants, which are a class of heart medication used to thin the blood.

Close monitoring of blood values, such as the INR, is required when these treatments are combined.


Q: Is it normal to not feel any change immediately after starting Benzro?

Official documentation states that Benzro is intended for the long-term control of uric acid levels and is not used to treat an acute gout flare.

In fact, due to the rapid mobilization of uric acid at the start of treatment, an aggravation of gout symptoms may temporarily occur.


Q: What does 'contraindication' mean in the context of Benzro?

A contraindication is a condition or factor that prevents the medicine from being used because the risk of harm outweighs the benefit.

For Benzro, contraindications include pre-existing conditions such as severe hepatic disease (liver) and severe renal impairment (kidney).


Q: Are the research studies on Benzro ongoing or completed?

Research studies, including short-term randomized controlled trials, have been completed to measure the drug's effectiveness in reducing uric acid levels.

However, larger-scale, high-quality studies tracking long-term clinical outcomes are still considered to be emerging.


Q: Does Benzro affect fertility?

Official safety documentation notes rare instances of temporary impotence as a potential adverse event. Furthermore, use of the medicine during pregnancy and lactation is not recommended due to a lack of adequate human safety data.

How should Benzro be stored and disposed of?

How to Store and Dispose of Benzro?

The official labeling for Benzro (Benzbromarone tablets) defines strict storage and disposal requirements to maintain product stability and ensure public safety.

Storage Requirement Specification (As per Regulatory Labeling)
Temperature Store at a temperature not exceeding 30 C (86 F).
Protection Store away from light, heat, and moisture.
Container Must be kept in the original container and tightly closed.
Child Safety Keep out of the reach and sight of children.

Expired or unused Benzro must be disposed of according to local regulations. The official protocol instructs consulting a pharmacy or medical institution on the proper method for discarding the remainder, often requiring disposal via an approved waste disposal plant rather than household waste or wastewater.

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

Available in countries:

Equivalent of Benzro found in:

A-Z Index: