Efficacy and Safety of Quetiapine Fumarate Sustained Release (SEROQUEL SR) in the Treatment of Major Depressive Disorders (OPAL)

This study has been completed.
Information provided by:
ClinicalTrials.gov Identifier:
First received: May 15, 2006
Last updated: March 24, 2009
Last verified: March 2009
The purpose of this study is to demonstrate superior efficacy of Quetiapine fumarate sustained release (SEROQUEL) compared with placebo when used as a mono-therapy in the treatment of Major Depressive Disorders PLEASE NOTE: Seroquel SR and Seroquel XR refer to the same formulation. The SR designation was changed to XR after consultation with FDA.

Condition Intervention Phase
Major Depressive Disorder
Drug: Quetiapine fumarate
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Treatment
Official Title: A Multicenter, Double-Blind, Randomized, Parallel-Group, Placebo-Controlled Phase III Study of the Efficacy and Safety of Quetiapine Fumarate Sustained Release (Seroquel SR®) as Mono-Therapy in the Treatment of Adult Patients With Major Depressive Disorder

Resource links provided by NLM:

Further study details as provided by AstraZeneca:

Primary Outcome Measures:
  • To evaluate the efficacy of Quetiapine SR compared with placebo in the treatment of patients with MDD as assessed by change from randomization to Week 8 in the MADRS total score

Secondary Outcome Measures:
  • To evaluate if Quetiapine SR improves the health-related quality of life of patients with MDD, compared to placebo
  • To evaluate if quetiapine SR reduces anxiety symptoms in patients with MDD, compared to placebo

Enrollment: 310
Study Start Date: April 2006
Study Completion Date: May 2007
Intervention Details:
    Drug: Quetiapine fumarate
    Other Name: Seroquel

Ages Eligible for Study:   18 Years to 65 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patient is able to provide written informed consent before beginning any study related procedures
  • Patient has a documented clinical diagnosis of major depressive disorder
  • Patient is able to understand and comply with the requirements of the study, as judged by a study investigator

Exclusion Criteria:

  • Patients with a history of non-compliance as judged by the study investigator
  • Patients with a known lack of response to previous treatment with quetiapine
  • Patients who have participated in a clinical trial within 4 weeks of randomization
  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT00326144

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Sponsors and Collaborators
Study Director: Seroquel Medical Science Director, MD AstraZeneca
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

ClinicalTrials.gov Identifier: NCT00326144     History of Changes
Other Study ID Numbers: D1448C00003  OPAL 
Study First Received: May 15, 2006
Last Updated: March 24, 2009
Health Authority: United States: Food and Drug Administration

Keywords provided by AstraZeneca:

Additional relevant MeSH terms:
Depressive Disorder
Depressive Disorder, Major
Behavioral Symptoms
Mental Disorders
Mood Disorders
Quetiapine Fumarate
Antipsychotic Agents
Central Nervous System Depressants
Physiological Effects of Drugs
Psychotropic Drugs
Tranquilizing Agents

ClinicalTrials.gov processed this record on May 26, 2016