A Study of the Efficacy of Intravenous Esketamine in Adult Patients With Treatment-Resistant Depression

Inclusion Criteria:

* Be medically stable on the basis of clinical laboratory tests
* Diagnostic for major depressive disorder (MDD) without psychotic features
* Have an inadequate response to at least 1 antidepressant in the current episode of depression and at least one other inadequate treatment response to an antidepressant either in the current episode or in a previous episode
* Women must be not pregnant; women must be postmenopausal, surgically sterile or, if heterosexually active, practicing a highly effective method of birth control during the study and for 3 months after receiving the last dose of study drug
* Men must agree to use a double barrier method of birth control and to not donate sperm during the study and for 3 months after receiving the last dose of study drug
* Signed informed consent document

Exclusion Criteria:

* History of, or current signs and symptoms of diseases or conditions that would make participation not be in the best interest (eg, compromise the well-being) of the patient or that could prevent, limit, or confound the protocol-specified assessments
* Has uncontrolled hypertension (systolic blood pressure (SBP)\> 160 mmHg or diastolic blood pressure (DBP)\> 90 mmHg despite diet, exercise or a stable dose of an allowed anti-hypertensive treatment) or any past history of hypertensive crisis
* Has known human immunodeficiency virus (HIV), hepatitis B, or hepatitis C infection, or have positive results at screening
* Has a primary diagnosis of current (active) generalized anxiety disorder, panic disorder, obsessive compulsive disorder, posttraumatic stress disorder, anorexia nervosa, or bulimia nervosa
* Has a history or current diagnosis of a psychotic disorder, bipolar disorder, mental retardation, or borderline personality disorders, mood disorder with postpartum onset, somatoform disorders or chronic fatigue syndrome
* Has had major surgery, (eg, requiring general or local anesthesia) within 4 weeks before screening, or will not have fully recovered from surgery, or planned surgery during the time the subject is expected to participate in the study