Reported Reactions

Drugs › Endothelin receptor antagonist

Brand name · Bosentan

Tracleer: adverse event reports filed with FDA

33,254 reports list it as a suspect or interacting product, 2004–2026. Class: Endothelin receptor antagonist. Also reported as Tracleer Tablet, Tracleer /01587701/.

33,254
reports as suspect product
0.2% of all reports · about 1,478 a year
56
reports, 12 months to June 2026
137 in the 12 months before
94.1%
marked serious by the reporter
72.7% across the class
39.4%
record death among outcomes, as reported
13,115 reports · not verified by FDA

Between January 2004 and June 2026, 33,254 adverse event reports received by FDA list the brand name Tracleer (bosentan) as a suspect or interacting product. Reports that mention it only as a concomitant medication (7,219) are left out of every figure here.

In the 12 months to June 2026, 56 reports listed it, down 59% from 137 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Over its reporting history that is about 1,478 reports a year and 0.2% of the 20,646,523 reports in the database, and 17.3% of the reports for the endothelin receptor antagonist class. How many people take it is not in the data, so a count is not a rate of occurrence.

Reporters most often recorded death (24%), dyspnoea (12.2%) and pneumonia (6%). A report can list several reactions, so shares add to more than 100%; 2,024 different terms appear across these reports. Death is recorded in 24% of these reports, a larger share than in the median endothelin receptor antagonist drug (12.5%).

94.1% of the reports are marked serious by the reporter (72.7% across the class); 39.4% record death among the outcomes and 54.5% record hospitalisation, as reported. 47.3% of the reports came from physicians, and the largest patient age group is 45 to 64 (21.6%). FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event."

Reports by month, five years

01121Jul 2021: 13Aug 2021: 10Sep 2021: 15Oct 2021: 16Nov 2021: 17Dec 2021: 112022Jan 2022: 12Feb 2022: 14Mar 2022: 12Apr 2022: 9May 2022: 14Jun 2022: 15Jul 2022: 17Aug 2022: 10Sep 2022: 10Oct 2022: 16Nov 2022: 9Dec 2022: 132023Jan 2023: 11Feb 2023: 8Mar 2023: 9Apr 2023: 17May 2023: 10Jun 2023: 8Jul 2023: 17Aug 2023: 12Sep 2023: 11Oct 2023: 9Nov 2023: 10Dec 2023: 212024Jan 2024: 18Feb 2024: 16Mar 2024: 13Apr 2024: 2May 2024: 7Jun 2024: 6Jul 2024: 12Aug 2024: 8Sep 2024: 16Oct 2024: 18Nov 2024: 10Dec 2024: 102025Jan 2025: 9Feb 2025: 9Mar 2025: 17Apr 2025: 5May 2025: 10Jun 2025: 13Jul 2025: 3Aug 2025: 3Sep 2025: 9Oct 2025: 7Nov 2025: 4Dec 2025: 52026Jan 2026: 4Feb 2026: 8Mar 2026: 2Apr 2026: 2May 2026: 4Jun 2026: 5

Reports by the month FDA received them. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases.

By year received

02,2244,4472004: 62920042005: 3882006: 3492007: 25620072008: 3782009: 4782010: 3,73320102011: 3,7332012: 4,4472013: 3,64820132014: 3,6042015: 3,2082016: 2,15920162017: 1,9632018: 1,6422019: 1,20020192020: 6692021: 2202022: 15120222023: 1432024: 1362025: 9420252026: 25

2026 covers reports received through June 2026 only.

Reactions recorded in the reports

share of Tracleer reports recording the termmedian drug in endothelin receptor antagonist

  1. Deaththe patient died; cause not stated by this term24%7,967
  2. Dyspnoeashortness of breath12.2%4,061
  3. Pneumonialung infection6%1,980
  4. Condition aggravatedthe condition being treated got worse4.2%1,412
  5. Aspartate aminotransferase increasedraised liver enzyme (AST)4.1%1,349
  6. Alanine aminotransferase increasedraised liver enzyme (ALT)4%1,328
  7. Fatiguetiredness3.7%1,221
  8. Falla fall3.6%1,195
  9. Nauseafeeling sick3.4%1,134
  10. Dizzinesslight-headedness or unsteadiness3.2%1,073
  11. Headachehead pain3.2%1,063
  12. Fluid retentionthe body holding extra fluid3.1%1,034
  13. Malaisegeneral feeling of being unwell3%1,006
  14. Oedema peripheralswelling of the legs, ankles or hands3%1,004
  15. Diarrhoealoose or frequent stools3%996
  16. Pulmonary hypertensionhigh pressure in the lung arteries3%993
  17. Vomitingbeing sick2.8%946
  18. Coughcough2.8%923
  19. Pyrexiafever2.7%898
  20. Syncopefainting2.6%849
  21. Cardiac failure congestivecongestive heart failure2.5%842
  22. Astheniaweakness or lack of energy2.5%839
  23. Cardiac failureheart failure2.5%820
  24. Disease progressionthe disease advanced2.5%815
  25. Chest painchest pain2.4%814
  26. Anaemialow red blood cells2.4%802
  27. Respiratory failurethe lungs could not supply enough oxygen2.4%792

Top 30 of 2,024 MedDRA preferred terms recorded across these reports, with a plain-language gloss where one is available. One report can record several terms. The hollow bar is the median share across the 6 drugs in the endothelin receptor antagonist class; it describes the reports, not the patients. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

Outcomes recorded

Death39.4%13,115
Life-threatening3%991
Hospitalisation (initial or prolonged)54.5%18,126
Disability1.4%481
Congenital anomaly0.1%21
Other serious20.5%6,820
Not serious5.9%1,978

Outcome flags as the reporter set them; a report can carry several, and "other serious" is FDA's own category for serious reports outside the named outcomes. Grey bar: all 192,634 reports in the class. FDA has not verified any outcome and states that the reports "cannot be used to estimate the incidence of these events."

Patients and reporters

Patient age

Under 22.5%835
2 to 113%1,006
12 to 171.3%426
18 to 448.7%2,896
45 to 6421.6%7,169
65 to 7416.5%5,476
75 and over16.9%5,605
Age not given29.6%9,841

Patient sex

Female56%18,612
Male20.5%6,821
Not given23.5%7,821

Who reported

Physician47.3%15,721
Pharmacist12.5%4,167
Other health professional31.7%10,542
Lawyer0%0
Consumer or non-health professional6.2%2,051
Not given2.3%773

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 77.9% of reports give the United States as the country of the event or reporter.

Reason for use recorded

Indication as recorded (MedDRA)ReportsShare
Pulmonary arterial hypertension24,41773.4%
Pulmonary hypertension4,11212.4%
Cor pulmonale chronic4771.4%
Skin ulcer3631.1%
Scleroderma associated digital ulcer1870.6%
Systemic sclerosis460.1%

The indication field is filled in by the reporter and is often blank; shares are of all 33,254 reports.

Drugs most often listed in the same reports

Drug (any role in the report)ReportsShare of Tracleer reports
Coumadin4,88014.7%
Sildenafil4,19912.6%
Revatio2,7278.2%
Adcirca2,6498%
Remodulin1,5884.8%
Lasix1,5094.5%
Oxygen1,4934.5%
Furosemide1,4664.4%
Aspirin1,3614.1%
Ventavis1,3244%

Other products listed in reports where Tracleer is a suspect product, whatever their own role. Co-listing means the two were recorded together; it says nothing about either product's part in the event. Only the 2,500 most-reported names are counted here.

In context

MeasureTracleerEndothelin receptor antagonistAll reports
Reports as suspect product33,254192,63420,646,523
Share of that pool—17.3%0.2%
Reports, latest 12 months56—1,332,454
Marked serious94.1%72.7%57.4%
Death recorded among outcomes, per 1,000 reports39420391
Hospitalisation recorded, per 1,000 reports545460213
Consumer-filed share6.2%39%45.8%
Top term, share of reportsDeath 24%median 12.5%4.1%

Shares are of reports, not of patients treated. The number of people taking a product is not in the data, so none of these figures is a rate, and differences between columns reflect who takes a product, who reports and how long it has been sold. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

Other drugs in the endothelin receptor antagonist class

DrugName typeReportsLatest 12 monthsMarked serious
Ambrisentangeneric54,5111,45982.5%
Letairisbrand49,7435846.6%
Opsumitbrand41,0721,54274.2%
Bosentangeneric8,30862157.6%
Macitentangeneric5,74610393.8%

Ordered by report count for navigation only. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic." A brand and its generic are separate rows because reporters name them separately.

Questions about Tracleer reports

How many adverse event reports has FDA received for Tracleer?

33,254 reports list Tracleer as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 56 of them arrived in the latest 12 months. Another 7,219 list it only as a concomitant medication.

What reactions are recorded in Tracleer reports?

death (24%), dyspnoea (12.2%), pneumonia (6%), pulmonary arterial hypertension (5%) and condition aggravated (4.2%). These are MedDRA preferred terms coded from what the reporter described; a report can list several, and a term's presence is not a finding that Tracleer was responsible.

How serious are the reports?

94.1% are marked serious by the reporter. Among the outcomes recorded, 39.4% of reports include death and 54.5% include hospitalisation. FDA has not verified these outcomes and states that the reports "cannot be used to estimate the incidence" of the events.

Who files these reports?

physician (47.3%), other health professional (31.7%) and pharmacist (12.5%). Most reports reach FDA through the manufacturer, which must forward reports it receives.

Are reports for Tracleer rising?

56 reports in the 12 months to June 2026, down 59% from 137 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Counts also move with how many people take a product, its time on the market and publicity.

Do these reports show that Tracleer was responsible for these reactions?

No. FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event." The reaction may relate to the condition being treated, to other medicines, or to something else.

Is this a list of the side effects of Tracleer?

No. It is a count of what was reported to FDA. The adverse reactions observed in clinical studies are printed on the FDA-approved label, which a pharmacist or clinician can go through with you.

How do I report an adverse event?

Consumers and health professionals can report to FDA through MedWatch (Form FDA 3500 online, or 1-800-FDA-1088), or to the manufacturer, which must pass reports on. See the guide on how to report.

Where this comes from. Counts are built from the openFDA Drug Adverse Event (FAERS) bulk export released 28 Sep 2026, which holds reports FDA received through 30 Jun 2026. Drug names are as reported, resolved to the brand or generic name on the FDA label where openFDA's harmonisation matched them; classes are the pharmacologic class (EPC) from the label and the National Drug Code Directory of 17 Sep 2026. A report counts here when it lists Tracleer as a suspect or interacting product; reports listing it only as a concomitant medication (7,219) are excluded. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.

Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.