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LY3437943

Phase 2

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

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials3
Total Enrollment455

FDA Designations

No designations recorded

Clinical trial landscape

LY3437943 · 14 trials · 7 indications

Phase 2 2Phase 1 12
NCT04881760A Study of LY3437943 in Participants Who Have Obesity or Are OverweightObesity
COMPLETED338 Analytics
NCT04867785A Study of LY3437943 in Participants With Type 2 DiabetesType 2 Diabetes
COMPLETED281 Analytics
PHASE2COMPLETED
A Study of LY3437943 in Participants Who Have Obesity or Are Overweight
ObesityUnlock trial analytics
PHASE2COMPLETED
A Study of LY3437943 in Participants With Type 2 Diabetes
Type 2 DiabetesUnlock trial analytics

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 Hemoglobin A1c (HbA1c)
Baseline, 24 Weeks

Change in HbA1c (%) from baseline in LY3437943 relative to placebo. HbA1c is the glycosylated fraction of hemoglobin A. HbA1c is measured primarily to identify average plasma glucose concentration over prolonged periods of time. Least squares (LS) mean was calculated using mixed model repeated measures (MMRM) for post-baseline measures: Variable = Treatment\*Time + Strata\*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 Time zero to 24 Hours Postdose (AUC0-24) of Ethinyl Estradiol
Predose on Day 1 up to 144 days postdose

PK: AUC0-24 of Ethinyl Estradiol

PK: Maximum Observed Concentration (Cmax) of Ethinyl Estradiol
Predose on Day 1 up to 144 days postdose

PK: Cmax of Ethinyl Estradiol

PK: Time of Maximum Observed Concentration (Tmax) of Ethinyl Estradiol
Predose on Day 1 up to 144 days postdose

PK: Tmax of Ethinyl Estradiol

PK: Area Under the Concentration Versus Time Curve from Time zero to 24 Hours Postdose (AUC0-24) of Drospirenone
Predose on Day 1 up to 144 days postdose

PK: AUC0-24 of Drospirenone

PK: Maximum Observed Concentration (Cmax) of Drospirenone
Predose on Day 1 up to 144 days postdose

PK: Cmax of Drospirenone

PK: Time of Maximum Observed Concentration (Tmax) of Drospirenone
Predose on Day 1 up to 144 days postdose

PK: Tmax of Drospirenone

Pharmacokinetics (PK): Maximum Concentration (Cmax) of LY3437943
Predose up to 43 days postdose

PK: Cmax of LY3437943

PK: Area Under the Plasma Concentration Versus Time Curve from Zero to T, Last Time Point (AUC[0-tlast]) of LY3437943
Predose up to 43 days postdose

PK: AUC\[0-tlast\] of LY3437943

PK: Area Under the Plasma Concentration Versus Time Curve From Zero to Infinity (AUC[0-∞]) of LY3437943
Predose up to 43 days postdose

PK: AUC(0-∞) of LY3437943

Part A: Pharmacokinetics (PK): Area Under the Plasma Concentration Versus Time Curve From Zero to Infinity (AUC[0-∞]) of LY3437943
Predose on Day 1 up to 43 days postdose (Part A)

Part A: PK: AUC(0-∞) of LY3437943

Part A: PK: Maximum Concentration (Cmax) of LY3437943
Predose on Day 1 up to 43 days postdose (Part A)

Part A: PK: Cmax of LY3437943

Pharmacokinetics (PK): Area under the concentration versus time curve from time zero to infinity (AUC0-∞) of LY3437943
Predose up to 30 days postdose

PK: AUC0-∞ of LY3437943

PK: Maximum observed concentration (Cmax) of LY3437943
Predose up to 30 days postdose

PK: Cmax of LY3437943

Urinary Excretion of LY3437943 Radioactivity Over Time Expressed as a Percentage of the Total Radioactive Dose Administered
Predose up to 63 days post dose
Fecal Excretion of LY3437943 Radioactivity Over Time Expressed as a Percentage of the Total Radioactive Dose Administered
Predose up to 63 days post dose
Number of Participants with One or More Treatment Emergent Adverse Events (TEAEs) and Serious Adverse Event(s) (SAEs) Considered by the Investigator to be Related to Study Drug Administration
Baseline through Week 20

A summary of TEAEs, SAEs and other non-serious adverse events (AEs), regardless of causality, will be reported in the Reported Adverse Events module

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
Number of Participants with One or More Serious Adverse Event(s) (SAEs) Considered by the Investigator to be Related to Study Drug Administration
Baseline through Day 106

A summary of SAEs and other non-serious adverse events (AEs), regardless of causality, will be reported in the Reported Adverse Events module

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.
0.5 milligrams (mg) LY3437943EXPERIMENTALParticipants received 0.5 mg LY3437943 administered as SC (subcutaneous) injection once weekly (QW).
4 mg LY3437943 (4 mg)EXPERIMENTALParticipants received 4 mg LY3437943 administered as SC injection QW.
1.5 mg DulaglutideACTIVE_COMPARATORParticipants received 1.5 mg dulaglutide administered as SC single-dose pen injection QW.
LY3437943EXPERIMENTALLY3437943 administered subcutaneously (SC)
LY3437943 + Combined Oral Contraceptive (COC)EXPERIMENTALThe COC ethinyl estradiol and drospirenone administered orally in combination with LY3437943 administered subcutaneously (SC).
LY3437943 - TestEXPERIMENTALA single dose of LY3437943 administered by subcutaneous (SC) injection via a test device (test formulation)
LY3437943 - ReferenceACTIVE_COMPARATORA single dose of LY3437943 administered by SC injection via a reference device (reference formulation)
LY3437943 (Part A)EXPERIMENTALLY3437943 administered subcutaneously (SC) in either thigh, upper arm, or abdomen
LY3437943 (Part B)EXPERIMENTALLY3437943 administered intravenously (IV)
LY3437943 (Normal Hepatic Function)EXPERIMENTALLY3437943 administered subcutaneously (SC).
LY3437943 (Severe Hepatic Impairment)EXPERIMENTALLY3437943 administered SC.
LY3437943 (Moderate Hepatic Impairment)EXPERIMENTALLY3437943 administered SC.
LY3437943 (Mild Hepatic Impairment)EXPERIMENTALLY3437943 administered SC.
[¹⁴C]-LY3437943EXPERIMENTALSingle dose of \[¹⁴C\]-LY3437943 administered subcutaneously (SC).
LY3437943 (Control)EXPERIMENTALLY3437943 administered subcutaneous (SC) to participants with normal renal function
LY3437943 (Severe Renal Impairment)EXPERIMENTALLY3437943 administered SC to participants with severe renal impairment
LY3437943 (End-Stage Renal Disease)EXPERIMENTALLY3437943 administered SC to participants with end-stage renal disease
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.
DulaglutideACTIVE_COMPARATORDulaglutide administered SC

Interventions

NameTypeDescription
LY3437943DRUGAdministered SC
PlaceboDRUGAdministered SC
DulaglutideDRUGAdministered SC
Ethinyl EstradiolDRUGAdministered orally
DrospirenoneDRUGAdministered orally
TestDEVICEUsed to administer LY3437943 SC
ReferenceDEVICEUsed to administer LY3437943 SC
[¹⁴C]-LY3437943DRUGAdministered SC.
MidazolamDRUGAdministered orally.
WarfarinDRUGAdministered orally.
CaffeineDRUGAdministered orally.
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Eligibility Criteria

Age Range18 Years to 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 RicoChinaJapanSingapore
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Frequently asked questions about LY3437943

What is LY3437943 used for?

LY3437943 is an investigational small molecule being developed by Eli Lilly and Company for metabolic conditions including obesity, type 2 diabetes, and overweight. It is currently in Phase 1 clinical development and has not been approved by the FDA.

Who makes LY3437943?

LY3437943 is developed by Eli Lilly and Company, a pharmaceutical company traded on the NYSE under the ticker LLY. The drug is in Phase 1 clinical trials for metabolic indications such as obesity and type 2 diabetes.

What phase is LY3437943 in?

LY3437943 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. All six clinical trials for LY3437943 have been completed, with no active trials currently ongoing.

What clinical trials is LY3437943 in?

LY3437943 has completed six Phase 1 clinical trials, including NCT03841630 in healthy participants in Singapore, NCT05757531 in healthy males in the United States, NCT05916560 in participants with impaired and normal liver function, and NCT05959096 in healthy participants with a high body mass index.

Is LY3437943 the same as retatrutide?

LY3437943 is also known as retatrutide. It is an investigational small molecule developed by Eli Lilly and Company for metabolic conditions including obesity and type 2 diabetes. The drug is currently in Phase 1 clinical development.