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Treprostinil

Phase 3

Idiopathic Pulmonary Fibrosis | Small molecule | Respiratory |United Therapeutics Corporation|Last Updated: May 22, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials3
Total Enrollment3,045
FDA Designations
No designations recorded
Clinical Trials (3)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05255991Multinational Study of Efficacy and Safety of Inhaled Treprostinil in Subjects With Idiopathic Pulmonary FibrosisPHASE3 COMPLETED 597Oct 4, 2022Jun 30, 2025Aug 15, 2025108 Argentina, Australia +14
NCT04905693Extension Study of Inhaled Treprostinil in Subjects With Fibrotic Lung DiseasePHASE3 ENROLLING BY_INVITATION 1,850Sep 6, 2022Jun 1, 2026May 22, 2026194 United States, Argentina +16
NCT04708782Study of Efficacy and Safety of Inhaled Treprostinil in Subjects With Idiopathic Pulmonary FibrosisPHASE3 COMPLETED 598Jun 1, 2021Feb 2, 2026May 5, 202698 United States, Canada +1
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Study Endpoints
Primary Endpoints
Change in Absolute FVC from Baseline to Week 52
Baseline to Week 52

The FVC measurement indicates the amount of air a person can forcefully and quickly exhale after taking a deep breath.

Long-term safety and tolerability of inhaled treprostinil in subjects with IPF or PPF
Baseline to 6 years

Incidence of AEs and SAEs, incidence of abnormal clinical laboratory parameters, abnormal vital signs, and abnormal 12-lead ECGs

Secondary Endpoints
Time to Clinical Worsening
Baseline to Week 52
Time to First Acute Exacerbation of IPF
Baseline to Week 52
Overall Survival at Week 52
Baseline to Week 52
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
PlaceboPLACEBO_COMPARATORMatching placebo inhaled using an ultrasonic nebulizer QID
Inhaled TreprostinilEXPERIMENTALTreprostinil for inhalation solution (0.6 mg/mL) delivered via an ultrasonic nebulizer which emits a dose of approximately 6 mcg per breath. Inhaled QID and titrated up to a target of 12 breaths QID or until the subject reaches their maximum clinically tolerated dose.
Interventions
NameTypeDescription
PlaceboDRUGPlacebo administered QID
Inhaled TreprostinilDRUGInhaled treprostinil (6 mcg/breath) administered QID
Treprostinil Ultrasonic NebulizerDEVICETreprostinil ultrasonic nebulizer which emits a dose of approximately 6 mcg per breath.
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Eligibility Criteria
Age Range40 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites108

Inclusion Criteria: 1. Subject gives voluntary informed consent to participate in the study. 2. Subject is ≥40 years of age, inclusive, at the time of signing informed consent. 3. The subject has a diagnosis of IPF based on the 2018 ATS/ERS/JRS/ALAT Clinical Practice Guideline (Raghu 2018) and conf...

Countries:ArgentinaAustraliaBelgiumChileDenmarkFranceGermanyIsraelItalyMexicoNetherlandsNew ZealandPeruSouth KoreaSpainTaiwanUnited StatesCanada
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Recent Changes (Last 90 Days)
MEDIUMJun 5, 2026NCT04708782TRIAL_REMOVED: changed
MEDIUMJun 5, 2026NCT04708782TRIAL_REMOVED: changed
MEDIUMJun 5, 2026NCT04708782TRIAL_REMOVED: changed
MEDIUMJun 5, 2026NCT04708782TRIAL_REMOVED: changed
MEDIUMJun 5, 2026NCT04708782TRIAL_REMOVED: changed
MEDIUMJun 5, 2026NCT04708782TRIAL_REMOVED: changed
LOWMay 26, 2026NCT04905693primaryCompletionDate: changed
LOWMay 24, 2026NCT04905693studyFirstPostDate: changed