Overview The Efficacy, Safety, And Tolerability Of Donepezil HCl (E2020) In Patients With CADASIL Who Have Cognitive Impairment Status: Completed Trial end date: 2007-02-01 Target enrollment: Participant gender: Summary This is an 18-week, prospective, multi-center, randomized, double-blind, placebo-controlled, (1:1) parallel-group study. Phase: Phase 2 Details Lead Sponsor: Eisai LimitedTreatments: Donepezil