Study Assessing the Safety, Tolerability, and Pharmacokinetics of SEP-363856 in Japanese Male and Female Subjects With Schizophrenia

This is a multiple oral dose, randomized, double-blind, placebo-controlled study assessing the safety, tolerability and pharmacokinetics (PK) of SEP-363856 when administered qhs to Japanese subjects with schizophrenia.

This multicenter study will be conducted in 2 cohorts (Cohort 1 and 2). Cohort transition will be determined by the Safety Review Team (SRT) before the start of Cohort 2. For each cohort, the target number of subjects completing the treatment period is defined as 8 for SEP-363856 group and 4 for placebo group. Subjects will be randomly assigned to either group. Dosing of the SEP-363856 group in Cohort 1 will be initiated at 50 mg SEP-363856 as an oral once daily dose for 3 consecutive days, followed by 75 mg SEP-363856 as an oral once daily dose for 4 consecutive days, and followed by 100 mg SEP-363856 as an oral once daily dose for 7 consecutive days. The SEP-363856 group in Cohort 2 will be dosed at 25 mg SEP-363856 as an oral once daily dose for 3 consecutive days, followed by 50 mg SEP-363856 as an oral once daily dose for 3 consecutive days, followed by 75 mg SEP-363856 as an oral once daily dose for 4 consecutive days, and followed by 100 mg SEP-363856 as an oral once daily dose for 7 consecutive days. In the placebo group, placebo will be orally administered according to the same administration schedule as the SEP-363856 group in each cohort.