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LY3437943

Phase 2

Obesity | Small molecule | Metabolic |Eli Lilly and Company|Last Updated: Sep 23, 2025

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_CONTROLLEDBiomarker
Total Trials3
Total Enrollment455
FDA Designations
No designations recorded
Clinical Trials (3)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04881760A Study of LY3437943 in Participants Who Have Obesity or Are OverweightPHASE2 COMPLETED 338May 20, 2021Nov 22, 2022Sep 13, 202328 United States, Puerto Rico
NCT06313528A Study to Measure Calorie Consumption and Usage in Participants With Obesity Using LY3437943PHASE1 COMPLETED 85Mar 20, 2024Aug 26, 2025Sep 23, 20253 United States
NCT05445232A Drug-Drug Interaction (DDI) Study of LY3437943 in Obese ParticipantsPHASE1 COMPLETED 32Jul 8, 2022Feb 24, 2023Apr 18, 20232 United States
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Study Endpoints
Primary Endpoints
Mean Percent Change From Baseline in Body Weight
Baseline, Week 24

Least squares (LS) means were calculated using a mixed-effects model for repeated measures (MMRM) for post-baseline measures: Variable = Treatment\*Time + Baseline BMI (\< 36kg/m2 vs. \>=36 kg/m2)\*Time + Sex (Female vs. Male)\*Time + Baseline\*Time.

Change from Baseline in Total Calorie Intake at Lunch and Dinner (Combined)
Baseline up to Week 17 (inclusive)
Pharmacokinetics (PK): Area Under the Concentration Versus Time Curve From Zero to Infinity (AUC[0-∞]) of Midazolam
Predose up to 24 hours postdose

PK: AUC\[0-∞\] of Midazolam

PK: Maximum Observed Concentration (Cmax) of Midazolam
Predose up to 24 hours postdose

PK: Cmax of Midazolam

PK: AUC[0-∞] of Warfarin
Predose up to 96 hours postdose

PK: AUC\[0-∞\] of Warfarin

PK: Cmax of Warfarin
Predose up to 96 hours postdose
PK: AUC[0-∞] of Caffeine
Predose up to 48 hours postdose

PK: AUC\[0-∞\] of Caffeine

PK: Cmax of Caffeine
Predose up to 48 hours postdose
Secondary Endpoints
Mean Percent Change From Baseline in Body Weight
Baseline, Week 48
Percentage of Participants Who Achieve ≥ 5% Body Weight Reduction
Week 24
Percentage of Participants Who Achieve ≥ 10% Body Weight Reduction
Week 24
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
PlaceboPLACEBO_COMPARATORParticipants received placebo matched to LY3437943 administered as subcutaneous (SC) injection once-weekly (QW).
1 milligram (mg) LY3437943EXPERIMENTALParticipants received 1 mg LY3437943 administered as SC injection QW.
4 mg LY3437943 (2 mg)EXPERIMENTALParticipants received 2 mg LY3437943 starting dose followed by 4 mg LY3437943 administered as SC injection QW.
4 mg LY3437943EXPERIMENTALParticipants received 4 mg LY3437943 administered as SC injection QW.
8 mg LY3437943 (2 mg)EXPERIMENTALParticipants received 2 mg LY3437943 starting dose followed by 4 mg LY3437943 and then 8 mg LY3437943 administered as SC injection QW.
8 mg LY3437943 (4 mg)EXPERIMENTALParticipants received 4 mg LY3437943 starting dose followed by 8 mg LY3437943 administered as SC injection QW.
12 mg LY3437943 (2 mg)EXPERIMENTALParticipants received 2 mg LY3437943 starting dose followed by 4 mg LY3437943, 8 mg LY3437943 and then 12 mg LY3437943 administered as SC injection QW.
LY3437943EXPERIMENTALLY3437943 administered subcutaneously (SC)
LY3437943 + Drug CocktailEXPERIMENTALMidazolam in combination with warfarin and caffeine (drug cocktail) administered orally followed by LY3437943 administered subcutaneously (SC) in week 1. At weeks 8, 12, \& 16, the LY3437943 will be administered SC on Day 1 followed by midazolam in combination with warfarin and caffeine (drug cocktail) administered orally on Day 2.
Interventions
NameTypeDescription
LY3437943DRUGAdministered SC
PlaceboDRUGAdministered SC
MidazolamDRUGAdministered orally.
WarfarinDRUGAdministered orally.
CaffeineDRUGAdministered orally.
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Eligibility Criteria
Age Range18 Years — 75 Years
SexALL
Healthy VolunteersNo
Study Sites28

Inclusion Criteria: * Participants must have a Body Mass Index (BMI) ) ≥30 and ≤50 kilograms per square meter (kg/m²), or ≥27 kg/m² and \<30 kg/m², with at least one of the following comorbidities: hypertension, dyslipidemia, cardiovascular disease * Participants must be willing to learn how to sel...

Countries:United StatesPuerto Rico
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