A Study of Lurasidone Compared With Placebo for the Treatment of Bipolar I Depression

Inclusion Criteria:

1. Patients who have provided written voluntary consent in person after receiving and understanding adequate explanation about the study, including the objectives, content, expected therapeutic and pharmacological effects, and risks.

2. Outpatients who are aged 18 through 65 years at time of informed consent.

3. Patients with bipolar I disorder, most recent episode depressed, without rapid cycling disease course ( no less than 4 episodes of mood disturbance in the 12 months prior to screening), and without psychotic features (diagnosed by DSM-5 criteria).