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REGN5381

Phase 2

Heart Failure | Small molecule | Cardiovascular |Regeneron Pharmaceuticals, Inc.|Last Updated: Jun 11, 2025

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials1
Total Enrollment59

FDA Designations

No designations recorded

Clinical trial landscape

REGN5381 · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT05353166REGN5381 in Heart Failure Adult Participants With Elevated Pulmonary Capillary Wedge PressureHeart Failure
COMPLETED59 Analytics
PHASE2COMPLETED
REGN5381 in Heart Failure Adult Participants With Elevated Pulmonary Capillary Wedge Pressure
Heart FailureUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence and severity of treatment-emergent adverse events (TEAEs)
Through the end-of-study (EOS) visit up to 126 days post-dose
Incidence of Treatment-Emergent Adverse Events
Up to Day 78

Secondary Endpoints

Change from baseline in pulmonary capillary wedge pressure (PCWP)
Over 6 hours post-dose administration
Change from baseline right atrial pressure (RAP)
Over 6 hours post-dose administration
Change from baseline cardiac output (CO)
Over 6 hours post-dose administration
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Group AEXPERIMENTALRandomized 1:1; limited to participants with heart failure with reduced ejection fraction (HFrEF) not taking sacubitril/valsartan
Group BEXPERIMENTALRandomized 1:1; limited to participants with HFrEF taking sacubitril/valsartan
Group CEXPERIMENTALRandomized 1:1; limited to participants with heart failure with preserved ejection fraction (HFpEF) not taking sacubitril/valsartan
REGN5381EXPERIMENTALSingle dose REGN5381 administered via IV infusion
PlaceboOTHERPlacebo matching single dose REGN 5381 administered via IV infusion

Interventions

NameTypeDescription
REGN5381DRUGSingle dose administered via IV infusion
Matching PlaceboDRUGSingle dose administered via IV infusion
PlaceboOTHERPlacebo matching single dose REGN 5381 administered via IV infusion
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites1

Key Inclusion Criteria: 1. Body mass index (BMI) between 18 and 35 kg/m\^2, inclusive, rounded to the nearest whole number 2. Ambulatory participants with New York Heart Association (NYHA) class II/III heart failure and at least 1 sign and/or symptom of congestion (eg, dyspnea on exertion, worsenin...

Countries:MoldovaBelgium
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Frequently asked questions about REGN5381

What is REGN5381 used for?

REGN5381 is an investigational small molecule being studied for heart failure. It has been evaluated in a Phase 1 trial in healthy adults and a Phase 2 trial in heart failure participants with elevated pulmonary capillary wedge pressure. It is not approved and remains in clinical development.

What does REGN5381 target?

REGN5381 is an NPR1 agonist, meaning it activates the natriuretic peptide receptor 1. This mechanism is being studied for its potential effects in heart failure. The drug is designed to act on this receptor, though its full clinical effects are still under investigation.

Who makes REGN5381?

REGN5381 is developed by Regeneron Pharmaceuticals, Inc., a biopharmaceutical company traded on NASDAQ under the ticker REGN. Regeneron is conducting clinical trials to evaluate the safety, tolerability, and pharmacokinetics of this investigational drug.

What phase is REGN5381 in?

REGN5381 has completed a Phase 1 trial and a Phase 2 trial. The Phase 1 study assessed safety, tolerability, and pharmacokinetics in healthy adults, while the Phase 2 study evaluated the drug in heart failure participants. It remains investigational and is not FDA approved.

What clinical trials is REGN5381 in?

REGN5381 has been studied in two completed trials. NCT04506645 was a Phase 1 study in healthy adults in Belgium, enrolling 90 participants. NCT05353166 was a Phase 2 study in heart failure participants with elevated pulmonary capillary wedge pressure in Moldova, enrolling 59 participants.

Is REGN5381 the same as an NPR1 agonist?

Yes, REGN5381 is described as an NPR1 agonist, meaning it targets the natriuretic peptide receptor 1. This mechanism is central to its investigational use in heart failure. The drug is being developed by Regeneron Pharmaceuticals under the name REGN5381.