A Study to Evaluate the Effects of E2609 on QTc Interval in Healthy Subjects

The study will consist of 2 phases: Prerandomization and Randomization. The Prerandomization Phase will have 2 periods: Screening (up to 27 days) and Baseline Period 1 (1 day). Eligibility will be determined during the Screening Period. The Randomization Phase will consist of 8 periods: Treatment Period 1, Baseline Period 2, Treatment Period 2, Baseline Period 3, Treatment Period 3, Baseline Period 4, Treatment Period 4, and a Follow-Up Period. Each Baseline Period will last 1 day, followed by the corresponding treatment period. On the first day of each treatment period, subjects will receive a single dose of the assigned study drug. During each treatment period, subjects will be required to stay in the clinical unit from the baseline period to 24 hours postdose. Subjects will then be released from the clinic and will undergo a washout interval of at least 13 days, during which time they will return for additional PK sampling.