Lead sponsor
Eisai Co., Ltd.
13 Alzheimer’s disease and related dementias trials led. Source: ClinicalTrials.gov, as of July 21, 2026.
13
Trials led
0
Ongoing
27,387
Total enrollment
915
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 1
1
Phase 2
2
Phase 3
3
Phase 4
2
Not applicable
5
Trials by status
Completed
12
Terminated
1
Trials led
TrialEligibility highlightPhaseStatusEnrollment
Post-marketing Surveillance of Long-term Administration of Donepezil Hydrochloride -Investigation of the Clinical Condition and Safety in Patients With Alzheimer's Disease-Alzheimer's diseaseN/ACompleted10,238
Post-marketing Surveillance of Donepezil Hydrochloride -Investigation of the Factors That Affect Aricept Medication Persistence Rate and the Safety and Efficacy in Patients With Alzheimer's Disease in Clinical PracticeAlzheimer's diseaseN/ACompleted8,662
Post-marketing Surveillance of Donepezil Hydrochloride Investigation of the Safety and Effectiveness of Combination Therapy of Donepezil Hydrochloride and Memantine Hydrochloride in Patients With Alzheimer's DiseaseAlzheimer's diseaseN/ACompleted3,482
Post-marketing Surveillance of Donepezil Hydrochloride -Investigation of the Clinical Safety and Effectiveness in Patients With Alzheimer's DiseaseAge ≥18N/ACompleted894
Post-marketing Surveillance of Donepezil Hydrochloride - Investigation of Long Term Safety and Efficacy of Aricept as Well as Its Proper Use Information in Patients With Dementia With Lewy Bodies (DLB).Dementia with Lewy bodiesN/ACompleted591
Compare the Efficacy and Safety of Donepezil Hydrochloride 23 mg Treatment With Continuation of Donepezil Hydrochloride 10 mg Treatment in Japanese Subjects With Severe Alzheimer's DiseaseAlzheimer's diseasePh 3Completed351
A Study of Donepezil Hydrochloride in Patients With Dementia Associated With Cerebrovascular DiseaseMMSE 10-24Ph 4Completed302
A Double-blind Study of E2020 (Donepezil Hydrochloride) in Patients With Dementia With Lewy Bodies (DLB) (Study E2020-J081-431)Dementia with Lewy bodiesPh 2Completed167
A Post-Marketing Clinical Study of Aricept in Patients With Dementia With Lewy Bodies (DLB)Dementia with Lewy bodiesPh 4Completed160
A Long-term, Extension Study of E2020 in Patients With Dementia With Lewy BodiesDementia with Lewy bodiesPh 2Completed160
A Study of E2020 in Patients With Dementia With Lewy Bodies (DLB), Followed by a Long-term Extension PhaseDementia with Lewy bodiesPh 3Completed142