A Clinical Study to Learn if SEP-363856 Has Physical Dependence in Adults With Schizophrenia

Inclusion Criteria: (this list is not all inclusive)

• Male or female subject between 18 and 65 years of age (inclusive) at the time ofinformed consent.

• Subject meets Diagnostic and Statistical Manual of Mental Disorders (DSM-5) criteriafor a primary diagnosis of schizophrenia as established by clinical interview (usingthe DSM-5 as a reference and confirmed using the Structured Clinical Interview forDSM-5, Clinical Trials Version [SCID-CT]).

• Subject must have a Clinical Global Impression-Severity Scale (CGI-S) score ≤ 4 (normal to moderately ill) at Screening and Day 1.

• Subject must have a PANSS total score ≤ 80 at Screening and a score of ≤ 4 on thefollowing PANSS items at Screening: P7 (hostility) and G8 (uncooperativeness).

• Subject has been taking an antipsychotic for at least 6 weeks prior to Screening andhas had no change in antipsychotic medication(s) (minor dose adjustments fortolerability purposes may be permitted) for at least 6 weeks prior to Screening.

Exclusion Criteria: (this list is not all inclusive)

• Subject has a DSM-5 diagnosis or presence of symptoms consistent with a currentDSM-5 diagnosis other than schizophrenia.

• Subject has attempted suicide within 6 months prior to Screening.

• Subject answers "yes" to "Suicidal Ideation" Item 4 (active suicidal ideation withsome intent to act, without specific plan) or Item 5 (active suicidal ideation withspecific plan and intent) on the Columbia Suicide Severity Rating Scale (C-SSRS) atScreening (ie, in the past 1 month) or at any subsequent C-SSRS assessment prior todosing (ie, since last visit).

• Subject is at significant risk of harming him/herself or others (passive or active)according to the Investigator's judgment.