Overview An Extension of the HORIZON Protocol Evaluating the Safety of Dimebon (Latrepirdine) in Subjects With Huntington Disease Status: Terminated Trial end date: 1969-12-31 Target enrollment: Participant gender: Summary An open-label extension study of the HORIZON protocol evaluating the safety of dimebon (latrepirdine)in subjects with Huntington disease. Phase: Phase 3 Details Lead Sponsor: Medivation, Inc.Collaborator: Pfizer