Treatment Resistant Depression | A Study of Olanzapine and Fluoxetine for Treatment-resistant Depression

Treatment Resistant Depression research study

What is the primary objective of this study?

The purpose of this study is to assess the efficacy and safety of olanzapine and fluoxetine compared to placebo and fluoxetine as treatment for treatment-resistant depression (TRD) in Chinese participants.

Who is eligible to participate?

Inclusion Criteria: - Have single or recurrent unipolar major depressive disorder (MDD) without psychotic features by Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition-Text Revision (DSM-IV-TR) clinical assessment - Have a total score ≥22 on the 17-item Hamilton Depression Rating Scale (HAM-D17) at screening and randomization - Have treatment-resistant depression (TRD), defined as having failed to achieve a satisfactory antidepressant response, in the opinion of the investigator, to separate treatment courses of at least 2 different antidepressants, other than fluoxetine, of adequate dosage and duration (≥6 weeks) within the current major depressive episode Exclusion Criteria: - Have a diagnosis of Parkinson's disease or a related disorder - Have a current or lifetime diagnosis of any of the following conditions, according to DSM-IV-TR criteria: Schizophrenia; Schizophreniform Disorder; Schizoaffective Disorder; Delusional Disorder; Psychotic Disorder Not Otherwise Specified; Bipolar Disorder I or II; Delirium of any type; Dementia of any type; Amnestic Disorder; any Substance-Induced Disorder; or any Psychotic Disorder due to a General Medical Condition - Have a current diagnosis of post-partum depression or MDD with a seasonal pattern as defined in the DSM-IV-TR - Have paranoid, schizoid, schizotypal, antisocial, or borderline personality disorder (Axis II) as a comorbid or primary diagnosis, based on DSM-IV-TR criteria - Have DSM-IV-TR substance dependence/abuse or are not willing to avoid use of the substance (not including dependence on nicotine or caffeine) within 30 days of screening - Are actively suicidal in the judgment of the investigator - Have uncorrected narrow-angle glaucoma - Have had one or more seizures without a clear and resolved etiology - Have leukopenia - Have any acute, serious, or unstable medical conditions - Have an increased serum prolactin concentration at screening - Have a rate-corrected cardiac QT interval, calculated using Bazett's formula (QTc Bazett's [Rate-corrected cardiac QT interval on electrocardiogram calculated using Bazett's formula(QTcB)]), on Electrocardiogram (ECG) >450 milliseconds (male) or >470 milliseconds (female) at screening - Have a history of allergic reaction to olanzapine, fluoxetine, or olanzapine in combination with fluoxetine - Have had treatment with olanzapine, fluoxetine, or olanzapine in combination with fluoxetine withdrawn due to clinically significant and/or intolerable adverse effects within 6 months of screening - Have received treatment with remoxipride within 6 months of randomization - Have received treatment with depot antipsychotics within one dosing interval before randomization - Have received electroconvulsive therapy (ECT) or vagus nerve stimulation (VNS) treatment within the current MDD episode, or has a history of failure to respond to adequate treatment courses of ECT or VNS, or is expected to require ECT or VNS at any time during the study - Have received previous treatment with clozapine - Have received treatment with a monoamine oxidase inhibitor (MAOI) within 14 days of screening, or are expected to need MAOI treatment at any time during the study or up until 5 weeks after study discontinuation

Which medical condition, disease, disorder, syndrome, illness, or injury is researched?

Treatment Resistant Depression

Study Interventions

Interventions can include giving participants drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available or noninvasive approaches such as surveys, education, and interviews.

Drug:OlanzapineAdministered Orally

Drug:FluoxetineAdministered Orally

Drug:PlaceboAdministered Orally

Study Arms

Research studies and clinical trials typically have two or more research arms. An arm is a group of people who receive the same treatment in the study.

Olanzapine + FluoxetineOlanzapine starting dose is 5 milligram (mg) (1 tablet). May titrate up to 10 mg (2 tablets), or 15 mg (3 tablets) administered once daily by mouth for 8 weeks. Fluoxetine starting dose is 20 mg. May titrate up to 40 mg or 50 mg administered once daily by mouth for 8 weeks.

Placebo + FluoxetinePlacebo matches the Olanzapine tablet for blinding. Fluoxetine starting dose is 20 mg, then may titrate up to 40 mg or 50 mg administered once daily by mouth for 8 weeks.

Study Status


Start Date: September 2012

Completed Date: November 2015

Phase: Phase 3

Type: Interventional


Primary Outcome: Mean Change From Baseline to 8 Week Endpoint in Montgomery-Äsberg Depression Rating Scale (MADRS)

Secondary Outcome: Mean Change From Baseline to 8 Week Endpoint in Clinical Global Impressions-Severity of Depression (CGI-S) Scale

Study sponsors, principal investigator, and references

Principal Investigator: Call 1-877-CTLILLY (1-877-285-4559) or 1-317-615-4559 Mon - Fri 9 AM - 5 PM Eastern time (UTC/GMT - 5 hours, EST)

Lead Sponsor: Eli Lilly and Company


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