A Clinical Study That Will Evaluate How Well SEP-363856 Works and How Safe it is in People With Schizophrenia That Switch to SEP-363856 From Their Current Antipsychotic Medication

Prior treatment

• Participant tests positive for drugs of abuse at Screening.

Other illness

• Participant has a current DSM-5 diagnosis or presence of symptoms consistent with a major psychiatric disorder, other than schizophrenia, that is the primary focus of treatment.
• Participant has any clinically significant unstable medical condition or any clinically significant chronic disease that in the opinion of the Investigator, would limit the participant's ability to complete and/or participate in the study.

Other

• Participants are at significant risk of harming self or others based on investigator's judgment.
• Female participant who is pregnant or lactating.

• Participants meets Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) criteria for a diagnosis of schizophrenia.
• Participants are judged to be clinically stable (ie, no evidence of an acute exacerbation of schizophrenia) by the Investigator for at least 8 weeks prior to Baseline.
• Participants must be judged by the Investigator to be an appropriate candidate for switching current antipsychotic medication due to safety or tolerability concerns and/or insufficient efficacy.
• Participants are taking an oral antipsychotic and the antipsychotic regimen has been stable for at least 6 weeks prior to Screening.