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Mevidalen

Phase 2

Alzheimer Disease | Small molecule | Neurology |Eli Lilly and Company|Trials Updated: Jun 18, 2026

Mevidalen development status

Highest phase Phase 2
Registered trials 7 across 1 sponsor since Feb 2015

Mevidalen target and mechanism

Molecular targetDRD1
Target classPositive Allosteric Modulator
ModalitySmall molecule

Also known as LY3154207

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials3
Total Enrollment728

FDA Designations

No designations recorded

Mevidalen clinical trials

Mevidalen · 3 trials · 3 indications

Phase 2 2Phase 1 1
NCT06538116A Study of Mevidalen (LY3154207) in Participants With Alzheimer's DiseaseAlzheimer Disease
COMPLETED304 Analytics
NCT03305809A Study of LY3154207 in Participants With Dementia Due to Lewy Body Dementia (LBD) Associated With Idiopathic Parkinson's Disease (PD) or Dementia With Lewy Bodies (DLB)Lewy Body Dementia
COMPLETED344 Analytics
PHASE2COMPLETED
A Study of Mevidalen (LY3154207) in Participants With Alzheimer's Disease
Alzheimer DiseaseUnlock trial analytics
PHASE2COMPLETED
A Study of LY3154207 in Participants With Dementia Due to Lewy Body Dementia (LBD) Associated With Idiopathic Parkinson's Disease (PD) or Dementia With Lewy Bodies (DLB)
Lewy Body DementiaUnlock trial analytics

Study Endpoints

Primary Endpoints

Change from Baseline in Integrated Alzheimer's Disease Rating Scale (iADRS)
Baseline, Week 24

iADRS assesses the impact of cognitive loss on everyday activities and provides a measure of global AD severity as a single summary score. It comprises of 2 underlying domains "cognitive ability" and "functional ability," and integrates the items in both the domains a single overall score ranging from 0 to 144, with lower scores indicating worse performance.

Change From Baseline in the Continuity of Attention (CoA) Composite Score of the Cognitive Drug Research Computerized Cognition Battery (CDR-CCB)
Baseline, Week 12

The CDR-CCB tests is designed to evaluate the effects of novel compounds on the quality of cognitive functioning which includes tests of attention (simple and choice reaction time, digit vigilance), working memory (spatial and numeric) and episodic memory (word recognition, picture recognition). Continuity of attention measures speed and accuracy and is calculated from 3 attentional tasks on the CDR computerized battery tests. For continuity of attention, the score range is -999 to 35. A high score reflects someone able to keep his/her mind on a single task for a prolonged period. A negative change from baseline reflects impairment compared to baseline. Data presented are model-based bayesian posterior mean response rates with 95% credible interval.

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 study completion (Day 15) in each part.

Secondary Endpoints

Change from Baseline in Alzheimer's Disease Assessment Scale-Cognitive Subscale (ADAS-Cog13)
Baseline, Week 24
Change from Baseline in Verbal Fluency Test
Baseline, Week 24
Change from Baseline in Category Fluency Test
Baseline, Week 24
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Mevidalen (high dose)EXPERIMENTALMevidalen high dose administered orally.
Mevidalen (low dose)EXPERIMENTALMevidalen low dose administered orally.
PlaceboPLACEBO_COMPARATORPlacebo administered orally.
10 milligram (mg) LY3154207EXPERIMENTALParticipants received 10 mg LY3154207 administered orally QD.
30 mg LY3154207EXPERIMENTALParticipants received 30 mg LY3154207 administered orally QD.
75 mg LY3154207EXPERIMENTALParticipants received 75 mg LY3154207 administered orally QD.
LY3154207EXPERIMENTALLY3154207 administered orally once daily in multiple-ascending dose cohorts for 14 days.

Interventions

NameTypeDescription
MevidalenDRUGAdministered orally
PlaceboDRUGAdministered orally
LY3154207DRUGAdministered orally.
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Eligibility Criteria

Age Range50 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites64

Inclusion Criteria: * Have gradual and progressive decline in memory function for greater than or equal to 6 months that is severe enough to interfere with activities of daily living. * Have MMSE score of 13 to 24. * Have eligibile plasma P-tau or historical evidence of AD pathology. * Have a relia...

Countries:United StatesJapanCanadaPuerto Rico
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Frequently asked questions about Mevidalen

What is Mevidalen used for?

Mevidalen is an investigational small molecule being studied for the treatment of Alzheimer disease. It is not approved for any indication and remains in clinical development. Eli Lilly and Company is evaluating it in a Phase 2 program, with the completed study enrolling 304 participants with Alzheimer disease.

What does Mevidalen target?

Mevidalen targets DRD1, the dopamine D1 receptor, and acts as a positive allosteric modulator. This target class means the drug enhances receptor signaling rather than activating the receptor directly. The DRD1 mechanism is being explored in Alzheimer disease, a neurology indication, by Eli Lilly and Company.

Who makes Mevidalen?

Mevidalen is developed by Eli Lilly and Company, which trades on the New York Stock Exchange under the ticker LLY. The compound is also referenced in discovery records as LY3154207. Lilly is the sponsor of the clinical program evaluating Mevidalen in Alzheimer disease.

What phase is Mevidalen in?

Mevidalen is in Phase 2 development. It is an investigational drug and has not been approved by the FDA or any other regulatory agency. The Phase 2 study in Alzheimer disease has been completed, and no active trials of Mevidalen are currently listed.

What clinical trials is Mevidalen in?

Mevidalen has been studied in one clinical trial, NCT06538116, titled A Study of Mevidalen (LY3154207) in Participants With Alzheimer's Disease. That Phase 2 trial was completed and enrolled 304 participants across the United States and Japan. It was randomized, double blind, and placebo controlled, with participants aged 50 years and older.

Is Mevidalen the same as LY3154207?

Yes. Mevidalen is also known as LY3154207, the code name used by Eli Lilly and Company in its development records. Both names refer to the same investigational small molecule targeting DRD1 as a positive allosteric modulator for Alzheimer disease.