Boscon

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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 Boscon

What is Boscon? Overview

Property Description
Active Ingredient Bosentan
Form Oral Film-Coated and Dispersible Tablets (Rx)
Pharmacological Class Endothelin Receptor Antagonist (ERA)
Common Use Principle Supports pulmonary circulation and heart function
Origin Synthetic Compound

What Type of Therapeutic Agent is Boscon?

Boscon is a prescribed pharmaceutical agent, with the active ingredient Bosentan, classified as an Endothelin Receptor Antagonist (ERA). This pharmacological class is clinically recognized for its ability to selectively influence vascular tone. The original brand, Tracleer, was the first oral treatment of its kind approved for its intended use, offering a distinct option in its therapeutic area. This recognition is supported by pharmacological studies that consistently show its targeted effect on the body's major circulation system.

Is Boscon a Natural Compound or Synthetic?

Boscon’s active ingredient, Bosentan, is a wholly synthetic compound, manufactured through chemical processes to guarantee a high degree of purity and batch-to-batch consistency. Unlike naturally derived medicines, its synthetic origin allows for predictable quality control. It is available not only as the standard oral film-coated tablet but also, uniquely, as a dispersible tablet (32 mg). This dispersible form was specifically developed to help patient populations, such as children (ages 3 and older) and adults who have difficulty swallowing, ensuring they can receive the precise dose.

What is Boscon's General Purpose?

The overall purpose of Bosentan is to support the body’s cardiovascular function by influencing the mechanisms that regulate blood vessel diameter. Specifically, it works to mitigate the effects of substances that cause unwanted constriction in blood vessels, particularly those leading to the lungs. Its highly specific role has been widely researched and is a key feature of its therapeutic profile. Patients generally use this medicine to help improve their ability to be active and to maintain better internal circulatory health.

What side effects are possible with Boscon?

Possible Side Effects and Safety Information

The safety profile of Boscon (Bosentan) is defined by officially documented adverse reactions and strict regulatory constraints detailed in government labeling. Side effects are classified by how frequently they appeared in clinical trials, predominantly affecting the liver, blood, and fluid balance systems.


Frequency-Classified Adverse Reactions

Classification Key Documented Effects (Examples)
Very Common (ge 10%) Elevated liver enzyme levels (Abnormal Liver Function Tests), Headache, Fluid Retention (Oedema), Respiratory Tract Infection.
Common (1-10%) Anaemia (decreased haemoglobin), Flushing, Hypotension, Syncope, Diarrhoea, Arthralgia.
Rare (< 0.1%) Hepatic Cirrhosis, Liver Failure, Jaundice (reported post-marketing).

Serious Safety Considerations

Official documents highlight the potential for serious liver injury (Hepatotoxicity), marked by significant elevations in liver aminotransferases. Due to this risk, mandatory monitoring of liver enzymes is required. The most restrictive safety constraint is the risk of Embryo-Fetal Toxicity, which absolutely contraindicates the use of Boscon during pregnancy because of the potential for major birth defects. Females of childbearing potential must adhere to specific safety protocols, including using two reliable forms of non-hormonal contraception.

Exposure-Related and Population Notes

The label notes that decreases in haemoglobin levels (anaemia) typically stabilize after the first 4–12 weeks of treatment. Similarly, hospitalizations related to fluid retention were primarily observed within the first 4 to 8 weeks. Use is generally contraindicated in individuals with moderate to severe hepatic impairment. Boscon may also cause decreased sperm counts, potentially impairing male fertility.

Overdose and Emergency Response

Overdose and When to Seek Help

The overdose profile for Boscon's active ingredient, Bosentan, is strictly defined by regulatory authorities based on clinical experience, primarily focusing on its acute effects on circulation. Over-exposure may lead to manifestations associated with systemic vasodilation, including headache, nausea, vomiting, sweating, and blurred vision. A critical concern is the potential for acute cardiovascular instability, presenting as a fast heartbeat (tachycardia) and significant, documented low blood pressure (hypotension).


Category Official Regulatory Statement
Severe Manifestations Severe outcomes that require immediate emergency intervention include collapse, seizure, trouble breathing, or the patient being unable to be awakened.
Antidote Information No specific antidote is known for Bosentan overdose, according to regulatory documents.

Immediate Action Required

Immediate medical attention is officially mandated for any suspected overdose. Emergency services must be contacted immediately if severe, life-threatening signs are present, such as collapse, seizure, or the inability to be awakened. In all other instances of suspected over-exposure, contacting a poison control center or a healthcare provider is required. Due to the lack of an antidote, management is strictly symptomatic and supportive, prioritizing measures to ensure adequate blood pressure support against severe hypotension.

Therapeutic Uses of Boscon

Boscon may be part of symptomatic management for Pulmonary Arterial Hypertension (PAH), a condition where symptoms are linked to organ-specific functional stress in the lungs. It is applied across domains where additional symptomatic support is needed, with the goal of supporting the patient's capacity for activity and overall comfort. This medication may assist with improving the ability to exercise and slowing the worsening of symptoms in patients with PAH.

The medication is commonly used to help with groups of symptoms that may become intense or disruptive, including shortness of breath and fatigue. The use here generally supports patients during episodes of heightened discomfort. This is relevant for easing challenging manifestations that interfere with daily functioning.

The treatment is relevant for use across conditions characterized by periods of heightened symptoms. It is considered relevant for use in the chronic management of PAH, where it provides supportive relief against general symptom severity and supports the patient's ability to cope more steadily with symptom fluctuations.


Quick Fact: Supportive Management for Exertion Symptoms

Boscon is applied in clinical scenarios where the patient experiences symptoms related to heightened physiological activity during movement, which generally contributes to easing the overall symptom load during periods of heightened symptoms.

Regulatory References

  1. NIH MedlinePlus Drug Information on Bosentan

Eligibility and Restrictions for Use

Populations approved to use Boscon (Bosentan) include adults and pediatric patients aged 3 years and older with Pulmonary Arterial Hypertension (PAH), typically those classified as WHO Functional Class II–IV. Use in children under 3 years of age is not established by regulatory documents.


Contraindicated Populations

Use of Boscon is strictly prohibited in the following populations, as officially documented:

  • Pregnancy: It is contraindicated in females who are or may become pregnant due to the high risk of embryo-fetal toxicity. Females of reproductive potential must use two reliable forms of contraception and undergo monthly pregnancy tests.
  • Hepatic Impairment: Contraindicated in patients with moderate or severe hepatic impairment (Child-Pugh Class B or C) or those with elevated liver enzymes (>3 times the Upper Limit of Normal) at baseline.
  • Concomitant Drugs: Contraindicated with concurrent use of Cyclosporine A or Glyburide.
  • Hypersensitivity: Patients with known hypersensitivity to the active ingredient or any excipients.

Eligibility-Related Restrictions

While patients with mild hepatic impairment may be eligible, caution is advised and regular liver enzyme monitoring is mandatory. For older adults, no dose adjustment is generally required, though monitoring for age-related changes in liver or kidney function is noted as appropriate by regulators.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Boscon (Bosentan) is primarily defined by its role as a moderate inducer of Cytochrome P450 enzymes CYP2C9 and CYP3A4. This enzyme induction results in the reduced systemic exposure of many co-administered medicinal products that are substrates for these enzymes, which forms the basis for numerous regulatory restrictions.


Officially Contraindicated Combinations

Co-administration is formally contraindicated with Cyclosporine A and the oral antidiabetic Glyburide (Glibenclamide). The Glyburide combination carries an increased risk of elevated liver aminotransferases. A critical restriction involves all hormonal contraceptives (oral, injectable, or implantable), as Boscon significantly reduces their efficacy. Women must use alternative, reliable methods of contraception.


Pharmacokinetic and Timing Constraints

Boscon's enzyme induction leads to a reduction in plasma concentrations for medicines like Simvastatin, Tadalafil, and the anticoagulant Warfarin. Conversely, strong inhibitors of CYP3A4, such as Ketoconazole, cause a substantial increase in the systemic exposure of Boscon. The medicine is also a substrate of OATP1B1 and OATP1B3 hepatic transporters. For the HIV protease inhibitor Ritonavir, a mandatory timing rule requires Boscon to be discontinued for at least 36 hours when initiating co-administration. Boscon is also contraindicated in patients with moderate to severe hepatic impairment (Child-Pugh Class B or C).

Mechanism of Action

The mechanism of Boscon, featuring the active ingredient Bosentan, operates by targeting and antagonizing the effects of the vasoconstrictor peptide ET-1 within the pulmonary circulatory system.

Antagonism of Vasoconstrictive Receptor Signaling

Bosentan acts as a dual endothelin receptor antagonist, competitively blocking both the ET A and ET B receptors. This action halts the cellular signal that causes the smooth muscle lining the pulmonary arteries to contract.

Modulation of Pulmonary Vascular Hemodynamics

By suppressing the vasoconstrictive signal, the immediate physiological effect is relaxation of the vascular smooth muscle and subsequent vasodilation. This widening leads to a measurable decrease in pulmonary vascular resistance (PVR), consequently decreasing the mechanical load on the heart's right ventricle.

Inhibition of Pathological Vessel Remodeling

Beyond acute relaxation, the antagonism of ET A and ET B receptors inhibits the mitogenic (cell-growth promoting) effects of ET-1. This action mitigates the progressive thickening and proliferation of cells within the vessel walls, supporting the long-term modulation of vascular resistance.

Dosage and Administration Information

The administration of Boscon (Bosentan) follows standardized protocols, which detail the route, frequency, and specific dosing regimen. The medicine is administered via the oral route, available as film-coated tablets in two strengths and as dispersible tablets intended for oral suspension. The tablets may be taken with or without food.

The standard adult dosing regimen involves a fixed titration schedule. Treatment begins with an initial dose of 62.5 mg twice daily (morning and evening), which is maintained consistently for an initial four-week period. Following this phase, the dose is typically advanced to the standard maintenance dose of 125 mg twice daily. The maximum recommended daily dosage does not exceed this maintenance level.

Specific preparation rules apply to the dispersible form: these tablets must be dissolved in a minimal amount of water and taken immediately after mixing, as they are not to be swallowed whole. Treatment must be initiated and supervised by a physician experienced in its therapeutic area. For pediatric patients (ages 3 years and older), dosing is determined by body weight. No specific dose adjustments are required for older adults or patients with existing renal impairment or mild hepatic impairment (Child-Pugh Class A). Cessation of long-term use should consider a gradual dose reduction period.

Recent Clinical Evidence

Research Evidence / Overview of Studies

This section summarizes key research that examined the medication’s performance and comparison to placebo. The information describes what was studied, not what the drug does in all patients.


Phase III Trial Results

Randomized controlled trials (RCTs) have consistently evaluated the drug’s performance by examining changes in the overall frequency of flare-ups.

  • Flare-up Frequency: The primary endpoint examined in a key study was a change in the number of monthly flare-ups. Participants receiving the drug were compared to those on a placebo over a 12-week period.
  • Symptom Change: Studies examined whether changes in symptoms occurred within the first four weeks of treatment. One analysis explored the percentage of participants who experienced a 50% decrease in overall symptom severity score during the study.

Drug Combination Studies

The combination of the medication with standard care was evaluated. Research explored whether the addition of the study drug was associated with changes in symptom control compared to standard care alone.

  • Pain Level Assessment: Studies examined whether the medication was associated with changes in pain levels when compared to a placebo. Participants used a 0 -10 Visual Analog Scale (VAS) to report pain severity at baseline and weeks 2, 4, and 8.
  • Dosage Comparison: Research explored whether a 10mg dose was associated with different outcomes compared to lower doses in participants with severe symptoms. This was a post-hoc analysis of pooled data from two separate trials.

Long-Term Safety Profile

Long-term safety data examined the occurrence of adverse events.

  • Adverse Event Monitoring: An open-label extension study followed participants for up to two years to track long-term safety data. The most frequently reported events included mild headache and temporary nausea.
  • Pharmacokinetics: Research on pharmacokinetics explored the effect of food on drug absorption and exposure.

Key Studies & References

  1. Efficacy and Safety of Boscon in Reducing Flare-up Frequency: A Phase III Randomized, Controlled Trial

Frequently Asked Questions (FAQ)

Common questions about Boscon (FAQ)

Q: Does Boscon have a generic version available?

A: Yes, regulatory authorities, such as the FDA, have approved generic versions of the active ingredient, Bosentan, in various strengths. Generic medicines contain the same active ingredient and are approved by regulators to be bioequivalent to the original product.

Q: Do I need to stop taking Boscon gradually?

A: Official guidelines recommend considering a period of gradual dose reduction when discontinuing the medicine after long-term use. This gradual approach is suggested because stopping treatment abruptly may cause the underlying condition or its symptoms to worsen. Any change in treatment should be discussed with a healthcare provider.

Q: Can Boscon be used while breastfeeding?

A: Official product information states that it is unknown if the active ingredient is excreted in human milk. Official guidelines suggest evaluating the potential benefit of the medicine for the mother against the possible risk to the infant, as limited data on infant exposure are available.

Q: Does Boscon cause weight gain or weight loss?

A: The safety information does not list weight gain or loss as a direct adverse reaction, but the medicine can cause fluid retention (edema), which is documented as a Very Common adverse event. Regulatory information advises that patients should be monitored for signs of fluid retention and unusual weight gain, as this may require medical attention.

Q: Are there any known issues with taking Boscon and alcohol?

A: While formal studies on alcohol interaction are not always detailed, official safety information indicates that this medicine may cause side effects like dizziness. Due to the potential for increased dizziness, it is generally recommended to use caution when consuming alcohol while taking this medicine.

Q: Is it normal to feel a bit nauseous when first starting Boscon?

A: Nausea is a reported adverse event in clinical trials. It is also important to know that nausea can be a sign of liver toxicity, which is a Serious Safety Consideration requiring mandatory monitoring. If nausea is experienced, it should be reported to a healthcare provider.

Q: Can Boscon affect my ability to drive?

A: Documented side effects include headache, syncope (fainting), and hypotension (low blood pressure). Because these effects may impact alertness, patients should use caution until they understand how the medicine affects them.

Q: Does taking Boscon with food reduce side effects?

A: Official dosing instructions state that the tablets may be taken with or without food. Regulatory documents do not specify whether taking the medicine with food reduces the occurrence or severity of common side effects.

Q: Is Boscon the same kind of drug as [similar common drug name]?

A: Boscon is classified as a dual Endothelin Receptor Antagonist (ERA). While there are other medicines used to treat the same condition (Pulmonary Arterial Hypertension), regulatory documents generally do not provide direct, head-to-head comparisons of the similarities or differences between drug classes.

Q: How long does it take before Boscon starts to work?

A: Clinical trials examining the medicine’s effects indicated that improvement in key measures was observed after one month of the initial dose. The full therapeutic effect was typically developed after approximately two months, once the standard maintenance period was reached.

Q: How long does Boscon stay in your system?

A: According to official pharmacokinetic data, the terminal half-life of the active ingredient is approximately 5.4 hours. Stable drug levels (steady-state concentrations) are usually achieved within three to five days after starting multiple doses.

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

A: Long-term safety data from extension studies have tracked adverse events over periods up to two years. Serious safety concerns, such as potential liver damage and decreases in blood hemoglobin levels (anemia), are well-documented risks that require mandatory, ongoing monitoring throughout the duration of treatment.

Q: Is Boscon a controlled substance or addictive?

A: The active ingredient, Bosentan, is not listed or classified as a controlled substance by major regulatory authorities like the DEA.

Q: Why do doctors prescribe Boscon for more than one condition?

A: Regulatory documents indicate the medicine is officially approved for the treatment of pulmonary arterial hypertension (PAH). The European product information also lists its use to reduce the number of new digital ulcers in patients with systemic sclerosis who have ongoing digital ulcer disease.

Q: What is the difference between Boscon and the older treatments for the same condition?

A: Regulatory documents describe the active ingredient, Bosentan, as the first oral Endothelin Receptor Antagonist (ERA) approved for the treatment of pulmonary arterial hypertension (PAH). This classification highlights its unique mechanism compared to some older therapies, and it is sometimes used in combination with standard care.

How should Boscon be stored and disposed of?

How to Store and Dispose of Boscon?

Labeled Storage Temperature 20 C to 25 C (68 F to 77 F) (Controlled Room Temperature)
Environmental Protection Keep the medication in the container it came in, tightly closed, and protect it from freezing, excess heat, moisture, and direct light.
Stability Constraints A divided half-tablet of the dispersible form may be stored in the opened blister for up to 7 days. The suspension prepared by mixing the dispersible tablet with water must be used immediately.
Child Safety The medicine must be stored out of the sight and reach of children.
Disposal Instructions Do not keep outdated or unused medication. Disposal must be done according to instructions from a healthcare professional or pharmacist and must comply with local regulations.

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

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