A Study in Prevention of Re-emergence of Depression Symptoms

The primary objective of this study was to assess the maintenance of efficacy of LY2216684 compared with placebo as adjunctive therapy to selective serotonin reuptake inhibitors (SSRIs) as measured by the time-to-symptom reemergence among participants with major depressive disorder (MDD) who met randomization criteria with adjunctive LY2216684 during the stabilization period.

This trial consists of two distinct periods: an open-label treatment period, which consists of two parts, 8 weeks acute open-label with movement to 12 weeks open-label stabilization if participants are in remission at end of 8 weeks (open-label for 20 weeks total) followed by a randomized, double-blind, placebo-controlled period for 24 weeks.

In order to enter the Stabilization Open-label Period, participants must have met remission criteria, defined as a Montgomery-Asberg Depression Rating Scale (MADRS) total score ≤10 at Week 8. In order to enter the Double-blind Randomization Withdrawal Period, participants must have met randomization criteria, defined as a MADRS total score ≤10 at Weeks 18, 19, and 20.

Eligibility Criteria:
Inclusion Criteria:

* Outpatients with clinical diagnosis of Major Depressive Disorder (MDD)
* Using a reliable method of birth control
* Are taking a selective serotonin reuptake inhibitor (SSRI) approved for MDD treatment within the participant's country and the SSRI prescribed, including dose, should be consistent with labeling guidelines within the participating country
* Have a partial response to SSRI treatment
* Meet inclusion scores on pre-defined psychiatric scales to assess diagnosis of depression, disease severity, and response to SSRI treatment
* Reliable and able to keep all scheduled appointments
* Have had at least 1 previous episode of MDD prior to the current episode within the past 5 years

Exclusion Criteria:

* Have had or currently have any additional ongoing Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM-IV-TR) Axis 1 condition other than major depression within 1 year of screening
* Have a current or any previous diagnosis of a bipolar disorder, schizophrenia, or other psychotic disorder
* Have a history of substance abuse and/or dependence within the past 1 year (drug categories defined by DSM-IV-TR), not including caffeine and nicotine.
* Have a DSM-IV-TR Axis II disorder that, in the judgment of the investigator, would interfere with compliance with protocol
* Have any diagnosed medical condition which could be exacerbated by noradrenergic agents, including unstable hypertension, unstable heart disease, tachycardia, tachyarrhythmia, narrow-angle glaucoma, or history of urinary hesitation or retention
* Have initiated or discontinued hormone therapy (including birth control or thyroid hormone) within the previous 3 months prior to enrollment
* Have a lifetime history of vagal nerve stimulation (VNS), transcranial magnetic stimulation (TMS), or psychosurgery
* Have received electroconvulsive therapy (ECT) in the past year
* Have a serious or unstable medical condition
* Have a history of seizure disorders
* Have initiated psychotherapy, change in intensity of psychotherapy or other nondrug therapies (such as acupuncture or hypnosis) within 6 weeks prior to enrollment or any time during the study
* Participants who, in the opinion of the investigator, are judged to be at serious risk for harm to self or others
* Are pregnant or breastfeeding
* Meet criteria for treatment-resistant depression