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MBX 4291

Phase 1

Obesity | Small molecule | Metabolic |MBX Biosciences, Inc.|Trials Updated: Jun 9, 2026

MBX 4291 development status

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

MBX 4291 target and mechanism

Molecular targetGLP-1/GIP
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment124

FDA Designations

No designations recorded

MBX 4291 clinical trials

MBX 4291 · 1 trial · 1 indication

Phase 1 1
NCT07142707A Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of MBX 4291 in Adult Participants With ObesityObesity
RECRUITING124 Analytics
PHASE1RECRUITING
A Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of MBX 4291 in Adult Participants With Obesity
ObesityUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of participants with Treatment Emergent Adverse Events (TEAEs)
The total duration of study participation for each participant including screening, treatment period, follow-up, and end of study visit will be up to 91 days in Part A, up to 99 days in Part B, and up to 148 days in Part C.
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
MBX 4291 (Part A)EXPERIMENTALParticipants will be administered single ascending doses of MBX 4291, or matching placebo.
MBX 4291 (Part B)EXPERIMENTALParticipants will be administered multiple ascending doses of MBX 4291, or matching placebo.
MBX 4291 (Part C)EXPERIMENTALParticipants will be administered multiple ascending doses of MBX 4291, or matching placebo.
PlaceboPLACEBO_COMPARATORParticipants will be administered single or multiple ascending doses of placebo.

Interventions

NameTypeDescription
MBX 4291DRUGMBX 4291 will be administered subcutaneously (SC)
PlaceboDRUGPlacebo: Placebo will be administered subcutaneously (SC)
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: * Age of \>18 to ≤65 years at the time of signing the informed consent. * Has a BMI of ≥30 to \<50 kg/m2 at screening and baseline. * Weight-stable, i.e., no more than ±5% change in body weight for at least 3 months prior to screening and between screening and baseline. Exclusi...

Countries:United States
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Frequently asked questions about MBX 4291

What is MBX 4291 used for?

MBX 4291 is an investigational small molecule being developed for the treatment of obesity. It is currently in Phase 1 clinical development, with an ongoing study evaluating its safety, tolerability, pharmacokinetics, and pharmacodynamics in adult participants with obesity.

What does MBX 4291 target?

MBX 4291 targets the GLP-1/GIP receptors. GLP-1 and GIP are incretin hormones involved in glucose metabolism and appetite regulation, making them relevant targets for obesity treatment. The drug is designed to modulate these pathways, though its exact mechanism is still under investigation.

Who makes MBX 4291?

MBX 4291 is being developed by MBX Biosciences, Inc., a biopharmaceutical company traded on the stock exchange under the ticker symbol MBX. The company is conducting clinical trials to evaluate the drug's potential as a treatment for obesity.

What phase is MBX 4291 in?

MBX 4291 is in Phase 1 clinical development. It is an investigational drug and has not yet been approved by regulatory authorities. The ongoing Phase 1 trial is designed to assess the drug's safety, tolerability, and pharmacological properties in humans.

What clinical trials is MBX 4291 in?

MBX 4291 is being studied in a Phase 1 clinical trial registered as NCT07142707. This randomized, double-blind, placebo-controlled study is recruiting 124 adult participants with obesity in the United States. The trial aims to evaluate the safety, tolerability, pharmacokinetics, and pharmacodynamics of MBX 4291.