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Ralinepag

Phase 3

PAH | Small molecule | Cardiovascular |United Therapeutics Corporation|Last Updated: Apr 14, 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 Trials2
Total Enrollment1,687
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03683186A Study Evaluating the Long-Term Efficacy and Safety of Ralinepag in Subjects With PAH Via an Open-Label ExtensionPHASE3 ENROLLING BY_INVITATION 1,000Sep 23, 2019Dec 1, 2026Feb 20, 2026190 United States, Argentina +31
NCT03626688A Study Evaluating the Efficacy and Safety of Ralinepag to Improve Treatment Outcomes in PAH PatientsPHASE3 COMPLETED 687Aug 30, 2018Dec 31, 2025Apr 14, 2026209 United States, Argentina +31
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Study Endpoints
Primary Endpoints
Number of subjects with treatment-emergent adverse events [Safety and Tolerability]
Up to 6 years

The safety and tolerability of ralinepag will be evaluated by the Number of subjects with treatment-emergent adverse events

Time from randomization to the first adjudicated protocol-defined clinical worsening event
The study duration was event-based. This parameter was assessed from randomization until the conclusion of the study, up to 3 years

Clinical worsening events are defined as death, nonelective hospital admission for worsening PAH (further defined in clinical study protocol), initiation of parenteral or inhaled prostacyclin pathway agent for treatment of worsening PAH, disease progression (further defined in clinical study protocol), or unsatisfactory long-term clinical response (further defined in clinical study protocol).

Secondary Endpoints
Change from Baseline in N-terminal pro-brain natriuretic peptide (NT-proBNP)
Baseline to Week 28
Change from Baseline in 6-minute walk distance (6MWD)
Baseline to Week 28
Change from Baseline in WHO/New York Heart Association (NYHA) Functional Class
Baseline to Week 28
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
RalinepagEXPERIMENTALRalinepag once daily extended-release tablets (oral) 50, 250, and 400 mcg titrated to the highest tolerated dose.
PlaceboPLACEBO_COMPARATORMatching placebo tablets (oral)
Interventions
NameTypeDescription
RalinepagDRUGActive
PlaceboDRUGPlacebo
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites190

Inclusion Criteria: 1. Evidence of a personally signed and dated informed consent form indicating that the subject has been informed of all pertinent aspects of the study prior to initiation of any study-related procedures. 2. Subjects who are willing and able to comply with scheduled visits, treat...

Countries:United StatesArgentinaAustraliaAustriaBelgiumBrazilBulgariaCanadaChileChinaCroatiaCzechiaDenmarkFranceGermanyGreeceHungaryIsraelItalyMexicoNetherlandsPolandPortugalRomaniaSerbiaSingaporeSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)UkraineUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT03683186primaryCompletionDate: changed
LOWMay 24, 2026NCT03683186studyFirstPostDate: changed
MEDIUMMay 21, 2026NCT03626688TRIAL_REMOVED: changed
MEDIUMMay 21, 2026NCT03626688TRIAL_REMOVED: changed