Tracleer

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Tracleer

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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 Tracleer

Quick Facts

Property Description
Active ingredient Bosentan
Form Film-coated tablets
Pharmacological class Endothelin Receptor Antagonist (ERA)
Common use Reduction of circulatory strain
Origin Synthetic compound

Tracleer is a prescription-only medication with the active substance Bosentan, available as film-coated tablets. This drug is classified as a synthetic, single-ingredient product belonging to the pharmacological class of Endothelin Receptor Antagonists (ERAs). Its structure is chemically defined as a substituted pyrimidine derivative.

Defining Tracleer: Active Ingredient and Pharmacological Class

The core of Tracleer is Bosentan (INN), which is precisely engineered as a synthetic compound. This origin ensures a standardized and consistent preparation, contrasting with substances isolated from organic sources. The medication is supplied for convenient oral administration. The Endothelin Receptor Antagonist class of drugs is clinically recognized for its targeted action against specific peptides that mediate blood vessel constriction.

What is the General Purpose of an Endothelin Antagonist?

The general purpose of Bosentan treatment is to achieve vasodilation, the widening of the blood vessels, which is the mechanism underpinning its use in managing circulatory conditions. Bosentan is defined as a dual antagonist because it blocks both the ETA and ETB endothelin receptors, counteracting the powerful constrictive actions of endothelin-1. This comprehensive blockade is a distinguishing factor in its clinical application.

By promoting the relaxation of the vascular tissue, this physiological effect reduces the resistance within the blood circulatory system. The ultimate benefit is the easing of pressure and strain that would otherwise be placed upon the heart, serving as a critical component in the management of high-resistance circulatory conditions.

What side effects are possible with Tracleer?

Possible Side Effects and Safety Information

The safety profile of Tracleer (Bosentan) is characterized by specific organ system risks and a spectrum of adverse reactions classified by frequency in regulatory documents. Key concerns are focused on the Hepatobiliary Disorders and Blood and Lymphatic System Disorders.

Frequency and System-Organ Effects

Adverse reactions are officially categorized according to their rate of occurrence observed in clinical data:

  • Very Common (Affecting ge 1 in 10 patients): These include Headache and Abnormal Liver Function Tests, specifically elevations of liver aminotransferases (ALT/AST). Peripheral Edema (fluid retention) is also listed in this category.
  • Common (Affecting 1 to 10 in 100 patients): Documented effects include Anemia (decreased hemoglobin levels), Flushing, Hypotension (low blood pressure), and certain hypersensitivity reactions like rash.

Serious Safety Constraints

Regulatory agencies define specific, serious risks associated with Bosentan use. The drug has a serious risk of Hepatotoxicity (severe liver injury), which can rarely progress to hepatic failure or cirrhosis, typically after prolonged exposure. Furthermore, there is a serious risk of Embryo-fetal Toxicity, meaning the drug is likely to cause major birth defects if used during pregnancy. This risk leads to a formal contraindication in pregnancy.

Population-Specific Notes

The label defines restrictions for specific patient groups. Use is contraindicated in patients with moderate to severe hepatic impairment. For females of reproductive potential, the contraindication in pregnancy mandates the use of two reliable forms of contraception. Additionally, treatment may cause decreased sperm counts in males.

Overdose and Emergency Response

In the event of a suspected Tracleer (bosentan) overdosage, official regulatory guidance mandates that individuals seek immediate medical attention. Emergency services must be contacted immediately if severe, life-threatening clinical signs are observed, such as collapse, seizure, trouble breathing, or inability to be awakened.

The most serious outcome documented in cases of massive overdosage is marked hypotension (severe low blood pressure), which is a consequence of the Endothelin Receptor Antagonist’s effect on the vascular system. Overdosage may also present with less severe systemic manifestations, including a dose-dependent headache of mild to moderate severity, along with nausea, vomiting, dizziness, blurred vision, and an increased heart rate.

No specific antidote is known or documented in the official regulatory labeling for Bosentan. Consequently, treatment is strictly symptomatic and supportive. Managing marked hypotension requires adequate blood pressure support, typically involving intravenous fluids. Furthermore, regulatory documents explicitly state that dialysis is not expected to be effective in the treatment of overdosage due to the drug’s high degree of plasma protein binding. The need for hospital observation must be determined by clinical staff.

Therapeutic Uses of Tracleer

What Tracleer Treats: Main Uses and Benefits

Tracleer is used to provide essential supportive therapeutic benefit, applied across domains where additional symptomatic support is needed in specific, symptom-driven clinical presentations. The medication is commonly used across domains involving specific systemic and vascular manifestations, and may be part of the management strategy for conditions associated with temporary functional strain. The use of this medication may generally help ease the overall symptom burden and offers supportive relief to patients experiencing challenging symptomatic phases.

It is considered relevant for managing symptoms that interfere with daily functioning and is commonly used across conditions presenting with acute episodes and is considered relevant in conditions characterized by periods of heightened symptoms. The medication is applicable in clinical settings that involve acute or disruptive symptom patterns, and is applied in addressing symptoms related to systemic imbalance.

“The symptomatic relief offered may help patients cope more steadily with symptom fluctuations and may assist with maintaining functional stability.”

Supporting Function and Easing Symptom Burden

Tracleer is used for managing symptoms that create noticeable functional strain, such as those related to heightened physiological activity. It is applied during phases when symptoms become more noticeable, where its benefit is supporting general well-being and providing supportive relief when symptoms interfere with routine activities. It may assist with easing the overall symptom load and may help contribute to improved day-to-day comfort during symptomatic periods.

Quick Fact: Symptomatic Management for Functional Strain

Regulatory References

  1. European Medicines Agency (EMA) overview

Eligibility and Restrictions for Use

Official Eligibility and Contraindications

Tracleer (bosentan) eligibility is defined by strict regulatory criteria, primarily regarding liver function and reproductive status. Use is generally approved for adults and for pediatric patients aged 3 years and older for the treatment of Pulmonary Arterial Hypertension (PAH), but only under specific conditions.

Absolute Non-Eligibility

Category Regulatory Status
Pregnancy Contraindicated (Risk of fetal harm)
Liver Impairment Contraindicated (Moderate or severe; ALT/AST gt 3 imes ULN at baseline)
Concomitant Use Contraindicated (With Cyclosporine A or Glyburide)

Conditional Use and Limitations

Females of reproductive potential must be tested for pregnancy prior to starting treatment and monthly thereafter, and are required to use two reliable methods of contraception throughout treatment and for one month after stopping. No dose adjustment is required for patients with pre-existing mild hepatic impairment (Child-Pugh A) or for those with renal impairment, including patients undergoing dialysis. Use in children under the age of 3 years is generally not recommended due to limited data.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Interaction Classification and Impact

Tracleer (bosentan) has officially documented interactions with multiple medicinal product classes, primarily due to its activity as a moderate inducer of the liver enzymes CYP3A4 and CYP2C9, and its role as a substrate for these enzymes.

Classification
Contraindicated Combinations
Co-administration with Cyclosporine A is forbidden due to a marked increase in bosentan plasma concentrations. Co-administration with Glyburide is also forbidden due to the increased risk of liver enzyme elevations.
Exposure-Altering Co-medications
Inhibitors of CYP3A4/CYP2C9 (e.g., ketoconazole) increase the concentration of bosentan. Inducers of CYP3A4/CYP2C9 (e.g., rifampin) decrease the concentration of bosentan, potentially reducing its effectiveness.
Pharmacodynamic Interactions
Bosentan decreases the exposure and reduces the efficacy of hormonal contraceptives (e.g., oral, injectable, or implantable forms). Therefore, alternative or two reliable forms of non-hormonal contraception are required.
Specific Timing Requirements
When initiating co-administration with Ritonavir-containing HIV regimens, a specific, phased approach is officially required, including a discontinuation period for Tracleer and subsequent dosage adjustments, to manage the resultant change in bosentan exposure.
Other Affected Medications
Co-administration with CYP3A substrates, such as certain statins (e.g., simvastatin), results in decreased plasma concentrations of the statin. The use of bosentan requires caution in patients with existing hepatic impairment.

Mechanism of Action

How Tracleer Works: Mechanism of Action

Tracleer (bosentan) works by precisely targeting the endothelin signaling system, a signaling pathway involved in regulating the constriction and proliferation of pulmonary blood vessel cells. Its action is focused on two main mechanistic domains: Receptor Blockade and Vascular Tone Modulation.


Dual Endothelin Receptor Blockade

This domain covers Tracleer’s direct molecular interaction with its targets: the Endothelin A ( ET A) and Endothelin B ( ET B) receptors. As a dual antagonist, the drug blocks the binding of the natural vasoconstrictor Endothelin-1 ( ET-1) to these receptors on the blood vessel walls, which modifies the early molecular steps of the endothelin cascade.


Modulating Vascular Tone and Cell Proliferation

This domain describes the resulting physiological effects of the blockade. By suppressing the ET-1 signaling cascade, Tracleer initiates signaling sequences that lead to pulmonary vasodilation (relaxation of the arteries) and the inhibition of vascular smooth muscle cell proliferation (anti-remodeling). This action influences the activity state within the pulmonary vasculature, leading to a reduction in pulmonary vascular resistance ( PVR).

Dosage and Administration Information

Tracleer (bosentan) is an oral medication taken twice daily—once in the morning and once in the evening—and may be administered with or without food.

Official Dosing Schedule

Treatment is typically initiated at a lower dose for the first four weeks, followed by a maintenance dose, with specific instructions for different patient groups.

Patient Group Initial Dose (First 4 Weeks) Maintenance Dose (After 4 Weeks)
Adults (>12 years, >40 kg) 62.5 mg twice daily 125 mg twice daily
Pediatric Patients (>12 years, <40 kg) 62.5 mg twice daily 62.5 mg twice daily
Pediatric Patients (≤12 years) Weight-based dosing (e.g., 16 mg to 64 mg twice daily) Weight-based dosing (same as initial)

Administration and Procedural Rules

  • Film-coated tablets must be swallowed whole with water.
  • Dispersible tablets for oral suspension must be dispersed in a minimal amount of water immediately before taking.
  • Missed Dose: If a dose is missed, take the tablet as soon as possible. If it is almost time for the next dose, the missed dose should be skipped to return to the regular schedule; do not take two doses at the same time.
  • Interacting Medications: Specific procedural steps are mandated when starting or stopping the co-administration of Tracleer with ritonavir, including discontinuing Tracleer at least 36 hours prior to initiating ritonavir and resuming at a lower dose after a minimum of 10 days of ritonavir treatment.
  • Discontinuation: If the decision is made to withdraw Tracleer, gradual dose reduction (e.g., halving the dose for three to seven days) should be considered to avoid potential clinical deterioration.

Recent Clinical Evidence

Research evidence / Overview of studies for Tracleer


Evidence for use in Conditions of Heightened Circulatory Strain in the Lungs

This section summarizes the structure of the foundational evidence, detailing the randomized controlled trials (RCTs), meta-analyses, and long-term observational studies that examined functional capacity and clinical status in patients with pulmonary circulatory strain.

The initial research for this context involved short-term, randomized, placebo-controlled trials. These studies explored outcomes related to functional imbalance, measuring functional capacity (distance walked in six minutes) and changes in clinical status over time. Studies also monitored shifts in pulmonary pressure biomarkers (e.g., PVR). The findings describe patterns in functional capacity measurements that were distinct in groups receiving the study drug compared to placebo. Long-term outcomes related to the durability of functional changes observed are not fully characterized, as extended follow-up often relies on less controlled, open-label designs.


Evidence for use in Specific Systemic and Vascular Manifestations

This part outlines the specific RCTs that studied the medication's effect on the development of new digital ulcers in patients with systemic sclerosis, distinguishing this research from studies that examined the healing of existing lesions.

Research examined the drug in the context of specific systemic and vascular manifestations, primarily focusing on the development of new vascular sores (digital ulcers) in adults with systemic sclerosis. Studies observed responses over short intervals, typically 16 to 24 weeks, using randomized, placebo-controlled trial designs. Trials reported observed patterns in the number of new digital ulcers measured in the study drug group compared to the placebo group. However, the research describes that studies did not report a clear pattern or changes measured concerning the healing status of existing ulcers that were present when the study began. The follow-up durations were limited.


Evidence in Specific Patient Populations and Research Gaps

Research was conducted in specific groups, including studies focused on pediatric patients (children) aged three years and older. However, the findings for specific subgroups are uncertain in some analyses, indicating observed patterns were not fully established across all studied patient groups. Data are still emerging and are insufficient for long-term outcomes or for patients experiencing either the most severe (Class IV) or the mildest (Class I) forms of circulatory strain. The primary limitation for vascular manifestations remains the limited information regarding changes measured in already-formed sores, as the research primarily examined the development of new lesions.

Key Studies & References

  1. Bosentan in patients with early functional class II pulmonary arterial hypertension: the EARLY trial

Frequently Asked Questions (FAQ)

Common questions about Tracleer (FAQ)

Q: Is Tracleer considered a blood thinner?

According to the official pharmacological classification, Tracleer is an Endothelin Receptor Antagonist. This means its primary action is to relax and widen the blood vessels, a process called vasodilation. It is not primarily classified as an anticoagulant or anti-platelet agent, which are the types of medicines commonly known as blood thinners.

Q: Does Tracleer thin the blood or affect clotting?

Official regulatory information indicates that Tracleer works by relaxing the blood vessels, not by changing the composition of the blood. The drug’s label notes that there are no clinically relevant interactions with commonly used anticoagulants.

Q: Do you have to take Tracleer forever?

Treatment with Tracleer is typically considered a long-term course of therapy for the management of the underlying condition. Official guidance states that if a decision is made to stop the treatment, the dose is generally reduced gradually. This gradual reduction is mentioned in regulatory guidelines as a consideration to help avoid potential clinical deterioration.

Q: What happens if Tracleer is stopped suddenly?

Official product information states that discontinuing the medication suddenly may lead to a worsening of symptoms related to the underlying condition. For this reason, official documents indicate that if a decision is made to discontinue treatment, a gradual dose reduction may be considered over several days.

Q: Does Tracleer affect fertility in men or women?

Official documents describe effects on fertility for both men and women. For men, treatment may cause a decrease in sperm count. For women of reproductive potential, the drug is formally contraindicated in pregnancy due to the serious risk of fetal harm.

Q: Can Tracleer be used if someone has anemia?

Official safety information notes that decreased red blood cell count, also known as anemia, is a documented side effect of Tracleer. Because of this, regulatory prescribing information requires monitoring, often through regular blood tests, to check red blood cell levels during treatment.

Q: Is the long-term use of Tracleer safe?

The official label includes a Boxed Warning regarding the serious risks associated with the medication, primarily Hepatotoxicity (liver injury) and Embryo-Fetal Toxicity. Regulatory documents note that rare cases of liver failure have been reported after prolonged treatment (over 12 months), necessitating mandatory monthly liver function monitoring.

Q: What are the reported success rates of Tracleer in clinical research?

Studies documented in the official prescribing information indicated that patients receiving the drug experienced a significant increase in exercise capacity compared to those receiving placebo. Research also showed a significant reduction in the rate of clinical worsening. These findings were typically based on objective measurements like the 6-minute walk distance.

Q: Does Tracleer improve shortness of breath?

Clinical trials supporting the use of Tracleer reported that patients experienced a significant reduction in dyspnea, which is the medical term for shortness of breath, during exercise testing. In addition, the studies noted a significant improvement in WHO functional class, which is a scale used to rate the severity of symptoms.

Q: How long does it typically take to start feeling the effects of Tracleer?

Clinical studies examining the medication's effect on exercise capacity reported that improvements were typically apparent after one month of starting treatment. These positive changes were often observed to be fully developed by about two months.

Q: Is it normal to feel tired when starting Tracleer?

General fatigue is not listed among the very common or common side effects in the product labeling. However, regulatory documents list unusual lethargy or fatigue as potential symptoms that could indicate liver injury. The potential for unusual or persistent tiredness is a factor sometimes monitored as part of the required safety checks.

Q: How is Tracleer different from other medicines used for the same condition?

Tracleer is part of the drug class known as Endothelin Receptor Antagonists (ERAs). This distinguishes its action because it works specifically by blocking endothelin, which is a powerful substance that causes blood vessels to constrict. This specific mechanism helps achieve vasodilation, differentiating its approach from other drug classes used for the condition.

Q: Is Tracleer a type of chemotherapy?

No, Tracleer is not classified as a chemotherapy agent. Official documentation identifies it as a substituted pyrimidine derivative belonging to the pharmacological class of Endothelin Receptor Antagonists. This class of drugs is primarily used for vasodilation (widening of blood vessels) and blood pressure reduction, not the treatment of cancer.

Q: Are there any specific foods or drinks to avoid while taking Tracleer?

Official administration rules state that the standard film-coated tablets may be taken with or without food. However, for the dispersible tablet formulation, it should only be mixed with water. Acidic liquids, such as fruit juice, are typically avoided as they may affect how the medication dissolves.

Q: Can I drink alcohol moderately while on Tracleer?

Official regulatory guidance typically states the importance of informing healthcare providers about all consumption habits, including alcohol use. Because Tracleer carries a serious risk of liver injury, and alcohol can also stress the liver, simultaneous use is typically treated with caution by medical professionals.

Q: Are there any long-term side effects of taking Tracleer?

Yes, certain potential long-term effects are documented in regulatory information. Rare cases of serious liver injury, including hepatic cirrhosis and failure, have been observed after prolonged use, particularly exceeding 12 months. Additionally, official information notes that treatment may result in a decreased sperm count in males.

Q: Does Tracleer cause weight gain or weight loss?

Regulatory documents list peripheral edema, which is swelling caused by fluid retention in the legs or abdomen, as a very common side effect. This fluid retention may be associated with measurable changes on a weight scale. Weight loss is not officially listed as a side effect.

Q: Are there restrictions on driving or operating machinery while taking Tracleer?

Official information indicates caution may be necessary when driving or operating machinery until the patient is aware of the medication’s effects. This is due to reported side effects such as dizziness or fainting (syncope), which could potentially impair these activities.

Q: Has Tracleer been studied in elderly patients?

Regulatory documents note that the clinical studies for Tracleer did not include a sufficient number of subjects aged 65 and older. Therefore, the official experience is limited in characterizing a difference in response or safety profile between the elderly and younger adult patient groups.

Q: Is Tracleer a standard treatment, or is it reserved for severe cases?

Clinical studies used to establish the effectiveness of Tracleer included patients with a wide range of symptom severity, primarily those categorized as WHO Functional Class II through IV. This indicates that its use in PAH is documented across patients ranging from mildly symptomatic up to those with severe disease.

Q: Are there generic versions of Tracleer available?

Yes, regulatory agencies, such as the FDA, have approved generic versions of the active ingredient, which is Bosentan. These generic formulations are available in the same approved strengths as the original product.

Q: Can Tracleer be used if someone has kidney issues?

Official prescribing information indicates that no dose adjustment is considered necessary for patients who have pre-existing kidney problems, including those with severe renal impairment or those undergoing dialysis. This is because studies showed the blood concentration of the active ingredient remains largely unchanged in these patients.

Q: Does Tracleer interact with common pain relievers like ibuprofen?

Official drug interaction databases suggest that Tracleer may potentially reduce the blood levels and effects of common pain relievers like ibuprofen. Official documents note that this information should be discussed with a healthcare provider if both medications are required.

Q: Why is frequent blood testing needed when taking Tracleer?

Frequent blood testing is a mandatory safety requirement to monitor two primary risks. Tests are needed to check for elevations in liver aminotransferases (ALT/AST) due to the risk of liver injury (Hepatotoxicity), and also to check red blood cell levels due to the risk of anemia.

Q: Do I need special tests while I am taking Tracleer?

Yes, according to the official product label, certain mandatory tests are required throughout treatment. This includes checking liver function tests (ALT and AST) before starting and at periodic intervals thereafter, as well as monitoring red blood cell counts.

Q: Why is Tracleer sometimes prescribed with other heart medications?

Clinical studies often involved the drug being added to a patient's existing medication regimen, which may have included other classes of heart medications like anticoagulants or diuretics. This reflects the reality that combination therapy is a common approach in the management of PAH.

Q: What clinical trials support the use of Tracleer?

The primary support for the drug's use comes from randomized, double-blind, placebo-controlled clinical trials. These studies focused on key outcomes like exercise capacity and the rate of clinical worsening. One of the pivotal studies cited in the documentation is known as AC-052-301/302 (also referred to as the ENABLE trial).

Q: What should I do if a potential drug interaction is mentioned in the official papers?

Regulatory guidance notes that it is important to disclose the use of Tracleer to any doctor, dentist, or pharmacist who is providing care. Official information also emphasizes the importance of keeping all scheduled appointments so that patient progress can be monitored.

Q: Does Tracleer affect cholesterol levels?

Official regulatory information indicates that Tracleer can decrease the blood concentrations of certain statins, which are a class of common cholesterol-lowering medications. Due to this potential drug interaction, the product label advises that blood cholesterol levels should be carefully monitored if these medications are used together.

Q: Is Tracleer safe for patients with high blood sugar or diabetes?

The use of Tracleer is formally contraindicated (forbidden) if a patient is also taking the drug Glyburide, which is a medication used to treat diabetes. The official prescribing information also notes that patients who have diabetes should use the medication with caution.

Q: How quickly does Tracleer start working on the body?

Clinical studies examining the medication's effect on exercise capacity reported that improvements were typically apparent after one month of starting treatment. These positive changes were often observed to be fully developed by about two months.

How should Tracleer be stored and disposed of?

How to Store and Dispose of Tracleer (Bosentan)

Tracleer must be stored at controlled room temperature, which is defined as 20 C to 25 C (68 F to 77 F), with permitted temperature variations up to 30 C. It is mandatory to store the medicine in a closed container and protect it from heat, moisture, direct light, and freezing. The product must always be stored out of the reach of children.

Stability and Disposal

For the dispersible tablet formulation, pieces of a divided tablet must be used within 7 days if stored at room temperature in the opened blister container.

Disposal of outdated or unused medicine requires consulting a healthcare professional or pharmacist for guidance on proper handling. The product should not be disposed of via wastewater or household waste.

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

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