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SEP-631

Phase 1

Healthy Volunteers | Small molecule | Other |Septerna, Inc.|Last Updated: Apr 21, 2026

Development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Jul 2025

Target and mechanism

Molecular targetMRGPRX2
Target classGpcr
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials1
Total Enrollment120

FDA Designations

No designations recorded

Clinical trial landscape

SEP-631 · 1 trial · 1 indication

Phase 1 1
NCT07069036A Study to Evaluate Single and Multiple Doses of SEP-631 in Healthy Adult VolunteersHealthy Volunteers
COMPLETED120 Analytics
PHASE1COMPLETED
A Study to Evaluate Single and Multiple Doses of SEP-631 in Healthy Adult Volunteers
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Study Endpoints

Primary Endpoints

Frequency of treatment emergent adverse events
From enrollment to end of follow up visit, up to approximately 2 months

Secondary Endpoints

Plasma PK of SEP-631 after single and multiple doses
From enrollment to end of treatment period, up to approximately 14 days
Plasma PK of SEP-631 under fed and fasted conditions
From enrollment to end of treatment period, up to approximately 14 days
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Single Ascending DoseEXPERIMENTAL -
Multiple Ascending DoseEXPERIMENTAL -
Food EffectEXPERIMENTAL -

Interventions

NameTypeDescription
SEP-631DRUGOral, tablet
PlaceboOTHEROral, tablet
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Eligibility Criteria

Age Range18 Years to 60 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: 1. Subjects who are able and willing to provide informed consent 2. Aged 18 to 60 years at the time of consent 3. Have a BMI within the range 18.5 to 32.0 kg/m2 4. In general good health Exclusion Criteria: 1. Any condition, which in the investigator's opinion might jeopardize...

Countries:Australia
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Frequently asked questions about SEP-631

What is SEP-631?

SEP-631 is an investigational small molecule drug developed by Septerna, Inc. It has been studied in a Phase 1 clinical trial in healthy adult volunteers. SEP-631 is designed to act on MRGPRX2, a G protein-coupled receptor. It is not approved for any indication and remains in clinical development.

What does SEP-631 target?

SEP-631 targets MRGPRX2, a G protein-coupled receptor (GPCR). MRGPRX2 is a mast cell receptor, and SEP-631 is a small molecule designed to act on this target. Targeting MRGPRX2 is the mechanism under investigation for SEP-631 in its clinical program.

Who is developing SEP-631?

SEP-631 is being developed by Septerna, Inc., a biotechnology company that trades under the ticker symbol SEPN. Septerna is the sponsor of the clinical program evaluating SEP-631.

What phase is SEP-631 in?

SEP-631 is in Phase 1 clinical development. Its single Phase 1 trial has been completed. SEP-631 is investigational and has not been approved by the FDA for any indication.

What clinical trials is SEP-631 in?

SEP-631 has been evaluated in one Phase 1 trial, NCT07069036, titled "A Study to Evaluate Single and Multiple Doses of SEP-631 in Healthy Adult Volunteers." The trial enrolled 120 healthy adult volunteers in Australia, was randomized, double-blind, and controlled, and is now completed.

What is SEP-631 used for?

SEP-631 has been studied in healthy adult volunteers in a Phase 1 trial, not in patients with a specific disease. It is an investigational drug and is not approved for any therapeutic use. Its clinical development remains at the Phase 1 stage.