Lead sponsor
Eisai Limited
3 Alzheimer’s disease and related dementias trials led. Source: ClinicalTrials.gov, as of July 21, 2026.
3
Trials led
0
Ongoing
260
Total enrollment
91
Sites
Distinct sites across this sponsor's lead trials. A site running several of them counts once, matching the map. Total enrollment sums each trial's reported enrollment, whether planned or actual.
Portfolio
How this sponsor's trials break down
Trials by phase
Phase 2
1
Phase 3
2
Trials by status
Completed
3
Trials led
TrialEligibility highlightPhaseStatusEnrollment
A 24-weeks, Multi-center, Randomized, Double-blind, Placebo Controlled Study to Evaluate the Efficacy and Safety of Donepezil Hydrochloride in Chinese Subjects With Severe Alzheimer's DiseaseAlzheimer's diseasePh 3Completed260
A Multi-Center, Randomized, Double-Blind, Parallel Group Study With 3 Groups Receiving Placebo, 5 mg of E2020 and 10 mg of E2020Alzheimer's diseasePh 2Completednot disclosed
The Efficacy, Tolerability and Safety of Donepezil (Aricept) in Parkinson's Disease Patients With DementiaParkinson's disease dementiaPh 3Completednot disclosed