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LY3305677

Phase 4

Obesity | Small molecule | Metabolic |Eli Lilly and Company|Trials Updated: Oct 7, 2026

LY3305677 development status

Highest phase Phase 4 run by China National Center for Cardiovascular Diseases (NCT07657676)
Phase scored for LLYPhase 2
Registered trials 9 across 3 sponsors since Nov 2016

LY3305677 target and mechanism

ModalitySmall molecule

Also known as Mazdutide

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials5
Total Enrollment2,024

FDA Designations

No designations recorded

LY3305677 clinical trials

LY3305677 · 5 trials · 5 indications

Phase 2 3Phase 1 2
NCT06817356A Study to Evaluate Mazdutide Compared With Placebo in Participants With Alcohol Use DisorderAlcohol Use Disorder
COMPLETED308 Analytics
NCT06143956A Master Protocol Study (LY900038) of Multiple Intervention-Specific-Appendices (ISAs) in Adult Participants With Obesity or OverweightObesity
RECRUITING1,481 Analytics
NCT06124807A Study of LY3305677 Compared With Placebo in Adult Participants With Obesity or OverweightObesity
COMPLETED179 Analytics
PHASE2COMPLETED
A Study to Evaluate Mazdutide Compared With Placebo in Participants With Alcohol Use Disorder
Alcohol Use DisorderUnlock trial analytics
PHASE2RECRUITING
A Master Protocol Study (LY900038) of Multiple Intervention-Specific-Appendices (ISAs) in Adult Participants With Obesity or Overweight
ObesityUnlock trial analytics
PHASE2COMPLETED
A Study of LY3305677 Compared With Placebo in Adult Participants With Obesity or Overweight
ObesityUnlock trial analytics

Study Endpoints

Primary Endpoints

Behaviors Associated with Alcohol Use Disorder (AUD) as Assessed by the Timeline Followback Method
Baseline, Week 28
Number of Participants Allocated to Each ISA
Baseline to Week 6

Each ISA will detail the intervention specific analysis.

Percent Change From Baseline in Body Weight at Week 32
Baseline, Week 32

Least squares means were calculated using an MMRM model for post-baseline measures: Variable = Baseline\*Time + Strata\*Time + Treatment\*Time, where Treatment and Strata are factors. Variance-Covariance structure (Percent Change from Baseline) = Unstructured. Strata is defined by joint levels of Sex and Baseline BMI (\<=30, \>30 kg/m\^2).

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

Number of Participants with One or More Serious Adverse Event(s) (SAEs) Considered by the Investigator to be Related to Study Drug
Baseline through 24 weeks

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

Percent Change From Baseline in Body Weight at Week 48
Baseline, Week 48
Change From Baseline in Body Weight
Baseline, Week 32, Week 48
Mean Percentage of Participants Who Achieve ≥5% Body Weight Reduction
Baseline, Week 32, Week 48
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeOTHER

Treatment Arms

ArmTypeDescription
MazdutideEXPERIMENTALMazdutide administered subcutaneously (SC).
PlaceboPLACEBO_COMPARATORPlacebo administered SC.
LY3305677 Obesity ISA OXA1EXPERIMENTALParticipants will receive LY3305677 or placebo subcutaneously (SC). Each ISA will detail the intervention specific analysis.
LY3841136 Obesity ISA LAA1EXPERIMENTALParticipants will receive LY3841136 or placebo SC. Each ISA will detail the intervention specific analysis.
LY3841136 Obesity ISA LAA2EXPERIMENTALParticipants will receive LY3841136, tirzepatide and placebo SC. Each ISA will detail the intervention specific analysis.
LY3549492 Obesity ISA GN01EXPERIMENTALParticipants will receive LY3549492 or placebo orally. Each ISA will detail the intervention specific analysis.
LY3549492 Obesity ISA GN02EXPERIMENTALParticipants will receive LY3549492 or placebo orally. Each ISA will detail the intervention specific analysis.
Obesity ISA MC01EXPERIMENTALParticipants will receive macupatide, eloralintide, and placebo SC. Each ISA will detail the intervention specific analysis.
3/6 Milligrams (mg) MazdutideEXPERIMENTALParticipants received once-weekly subcutaneous Mazdutide with dose escalation until the target dose (3 or 6 mg) was achieved, starting at 1.5 mg from Weeks 0-3, followed by 3 mg from Weeks 4-31, then 6 mg from Weeks 32-48.
10 mg MazdutideEXPERIMENTALParticipants received once-weekly subcutaneous Mazdutide with dose escalation until the target dose (10 mg) was achieved, starting at 1.5 mg from Weeks 0-3, followed by 3 mg from Weeks 4-7, 6 mg from Weeks 8-11, 8 mg from Weeks 12-15, and then 10 mg from Weeks 16-48.
16 mg MazdutideEXPERIMENTALParticipants received once-weekly subcutaneous Mazdutide with dose escalation until the target dose (16 mg) was achieved, starting at 1.5 mg from Weeks 0-3, followed by 3 mg from Weeks 4-7, 6 mg from Weeks 8-11, 9 mg from Weeks 12-15, 12 mg from Weeks 16-19, and then16 mg from Weeks 20-48.
LY3305677EXPERIMENTALLY3305677 administered subcutaneously (SC)

Interventions

NameTypeDescription
MazdutideDRUGAdministered SC
PlaceboDRUGAdministered SC
LY3305677DRUGAdministered SC. ISA specific interventions will be listed in the ISA.
LY3841136DRUGAdministered SC. ISA specific interventions will be listed in the ISA.
TirzepatideDRUGAdministered SC. ISA specific interventions will be listed in the ISA.
LY3549492DRUGAdministered orally. ISA specific interventions will be listed in the ISA.
LY3532226DRUGAdministered SC. ISA specific interventions will be listed in the ISA.
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Eligibility Criteria

Age Range21 Years to 65 Years
SexALL
Healthy VolunteersNo
Study Sites25

Inclusion Criteria: * Current AUD diagnosis as defined by Diagnostic and Statistical Manual of Mental Disorders (DSM)-5 criteria. Exclusion Criteria: * Have a history of significant active or unstable major depressive disorder, suicidal ideation, or other severe psychiatric disorder within the la...

Countries:United StatesArgentinaGermany
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Recent Changes (Last 90 Days)

LOWOct 7, 2026NCT06143956lastUpdatePostDate: changed
LOWOct 7, 2026NCT06143956lastUpdatePostDate: changed
LOWSep 8, 2026NCT06143956lastUpdatePostDate: changed
LOWSep 8, 2026NCT06143956lastUpdatePostDate: changed
MEDIUMAug 16, 2026NCT06817356TRIAL_REMOVED: changed
MEDIUMAug 16, 2026NCT06817356TRIAL_REMOVED: changed
MEDIUMAug 16, 2026NCT06817356TRIAL_REMOVED: changed
MEDIUMAug 16, 2026NCT06817356TRIAL_REMOVED: changed
LOWAug 6, 2026NCT06143956lastUpdatePostDate: changed
LOWAug 6, 2026NCT06143956lastUpdatePostDate: changed

Frequently asked questions about LY3305677

What is LY3305677?

LY3305677 is an investigational small molecule being developed by Eli Lilly and Company for the treatment of type 2 diabetes, obesity, and overweight. It is not yet approved and remains in clinical development, with studies conducted in adults aged 18 and older.

What is LY3305677 used for?

LY3305677 is being studied for type 2 diabetes mellitus, obesity, and overweight. Clinical trials have enrolled adults with type 2 diabetes as well as adults with obesity or overweight, including some healthy volunteers. It is an investigational therapy and has not been approved for any indication.

Who makes LY3305677?

LY3305677 is developed by Eli Lilly and Company, which trades on the New York Stock Exchange under the ticker LLY. Lilly is running the clinical program, including a Phase 2 master protocol study in adults with obesity or overweight and earlier Phase 1 studies.

What phase is LY3305677 in?

LY3305677 is in clinical development. A Phase 1 study in participants with type 2 diabetes and a Phase 1 study in participants with obesity or overweight have both been completed, and a Phase 2 master protocol study in adults with obesity or overweight is currently recruiting.

What clinical trials is LY3305677 in?

The active trial is NCT06143956, a Phase 2 master protocol study of multiple intervention-specific appendices in adults with obesity or overweight, recruiting in the United States and Argentina with 1,481 participants. Completed studies include NCT05623839 in obesity or overweight and NCT03928379 in type 2 diabetes.

How many participants have been enrolled in LY3305677 trials?

Across the reported studies, 1,537 participants have been enrolled in LY3305677 trials. The Phase 2 master protocol NCT06143956 accounts for 1,481 of these, while the completed Phase 1 study NCT05623839 enrolled 32 participants and the completed Phase 1 study NCT03928379 enrolled 24.