Efficacy and Safety of Flexibly Dosed BMS-820836 in the Treatment of Patients With Treatment Resistant Major Depression

Inclusion Criteria:

- Patients must be able to understand the nature of the study, agree to comply with the
prescribed dosage regimens, report for regularly scheduled office visits, and
communicate to study personnel about adverse events and concomitant medication use.

- Patients with a diagnosis of Major Depressive Disorder, currently experiencing a
Major Depressive Episode, as defined by Diagnostic and Statistical Manual of Mental
Disorders- Fourth Edition Text Revision(DSM IV TR) criteria. The current depressive
episode must be > 8 weeks in duration and < 3 years duration.

- In the current Major Depressive Disorder (MDD) episode, patients should report a
history of inadequate response to 1 - 3 adequate trials of antidepressant treatment.

- Patients must have a 17-item Hamilton Depression Rating Scale (HAM-D17) total score
=>18 at Screening.

Exclusion Criteria:

- Patients who report an inadequate response (less than 50% reduction in depressive
symptom severity) to more than three adequate trials of antidepressant treatments
during the current depressive episode.

- Patients who have failed duloxetine at an adequate dose and for an adequate duration
in their current episode unless in the judgment of the investigator, the patient
could benefit from the treatment with this medication.

- Patients whose only inadequate response to an antidepressant in the current Major
Depressive Episode (MDE) is to an Serotonin norepinephrine reuptake inhibitors (SNRI)
(duloxetine, venlafaxine, desvenlafaxine or milnacipran).