Summary:
This is a multicenter, randomized, double-blind, placebo-controlled parallel-group, fixed-dose study in patients with a primary diagnosis of MDD according to criteria of the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) who have an inadequate response to ongoing ADT.
Inclusion Criteria:
Male or female patients between the ages of 18 and 65 years, inclusive
Currently depressed with diagnosis of Major Depressive Disorder (MDD) (MDD with psychotic features will be acceptable)
Currently having an inadequate response to ADT of one of the following antidepressants as monotherapy treatment for at least 6 weeks duration:
- citalopram/escitalopram
- fluoxetine
- paroxetine
- sertraline
- duloxetine
- levomilnacipran/milnacipran (if locally approved for MDD)
- venlafaxine/desvenlafaxine
- bupropion
- vilazodone
- vortioxetine
2 or more ADT (Antidepressant treatment) failures in the current MDE
The start of current MDE (major depressive episode is 12 weeks but no more than 18 months)
Have taken ADT for at least 6 weeks in the current MDE, 12 weeks to 18 months
Exclusion Criteria:
Within the patient's lifetime, has a confirmed DSM-5 psychiatric diagnosis other than MDD, including:
- Schizophrenia, Schizoaffective Disorder, Schizophreniform Disorder or other psychotic disorder;
- Bipolar Disorder;
Within 6 months of Screening, has a confirmed DSM-5 psychiatric diagnosis other than MDD including:
- Anxiety disorders such as Panic Disorder or Generalized Anxiety Disorder; Obsessive-compulsive Disorder; Posttraumatic Stress Disorder as primary diagnoses. Note: Anxiety symptoms may be allowed if secondary to MDD, provided these symptoms do not require concurrent treatment;
- Eating disorder;
- Substance use disorders (excluding nicotine);
- Personality disorder of sufficient severity to have a major impact on the patient's psychiatric status;
- Within 12 months of Screening, has had any other psychiatric condition (other than MDD) that has been the main focus of treatment