Quetiapine vs Haloperidol Decanoate for the Long Term Treatment of Schizophrenia and Schizoaffective Disorder

This study has been completed.
Information provided by:
VA Office of Research and Development
ClinicalTrials.gov Identifier:
First received: July 3, 2001
Last updated: January 20, 2009
Last verified: December 2004

The purpose of this research study is to determine whether a new drug for schizophrenia is better for the maintenance treatment than a standard drugs currently prescribed. The new medication is called quetiapine and it will be compared with a standard medication called haloperidol decanoate. The study will determine if quetiapine causes fewer problems than haloperidol with side effects such as stiffness and restlessness and whether it costs the VA more or less to treat patients with quetiapine. In addition, blood samples will be collected every three months to determine if certain chemicals in the blood can influence the outcome of the subjects' illness.

Condition Intervention
Schizoaffective Disorder
Drug: quetiapine
Drug: haloperidol decanoate

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Primary Purpose: Treatment
Official Title: Predicting the Optimal Pharmacotherapy for Outpatients With Schizophrenia

Resource links provided by NLM:

Further study details as provided by VA Office of Research and Development:

Study Start Date: April 1997
Estimated Study Completion Date: March 2002

Ages Eligible for Study:   18 Years to 60 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria

  1. Schizophrenia or Schizoaffective Disorder diagnosed by DSM-IV
  2. Between the ages 18-60.
  3. A candidate for maintenance antipsychotic therapy. This means that patients will have had at least two documented episodes of acute schizophrenic illness or at least two years of continuing psychotic symptoms.

Exclusion Criteria

  1. Organic brain disease.
  2. Mental Retardation
  3. Chronic medical illness which would make antipsychotic medication inappropriate.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00018642

United States, California
VA Greater Los Angeles Healthcare System
Los Angeles, California, United States, 90073
Sponsors and Collaborators
VA Office of Research and Development
  More Information

No publications provided

ClinicalTrials.gov Identifier: NCT00018642     History of Changes
Other Study ID Numbers: MHBS-042-96F
Study First Received: July 3, 2001
Last Updated: January 20, 2009
Health Authority: United States: Federal Government

Keywords provided by VA Office of Research and Development:
haloperidol decanoate

Additional relevant MeSH terms:
Psychotic Disorders
Mental Disorders
Schizophrenia and Disorders with Psychotic Features
Decanoic acid
Haloperidol decanoate
Anti-Dyskinesia Agents
Anti-Infective Agents
Antifungal Agents
Antipsychotic Agents
Autonomic Agents
Central Nervous System Agents
Central Nervous System Depressants
Dopamine Agents
Dopamine Antagonists
Gastrointestinal Agents
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Peripheral Nervous System Agents
Pharmacologic Actions
Physiological Effects of Drugs
Psychotropic Drugs
Therapeutic Uses
Tranquilizing Agents

ClinicalTrials.gov processed this record on October 09, 2015