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Antipsychotic Therapy and First Episode

This study has been completed.
Information provided by:
The University of Hong Kong Identifier:
First received: June 2, 2006
Last updated: February 17, 2011
Last verified: June 2008
For schizophrenic patients who remained in remission while on maintenance medication, there may come a point in time when the relative risk for relapse become so low that discontinuation of therapy can be considered. This study is to investigate whether that point in time is reached in 12 months following the first episode illness. Moreover, it also aims to identify other predictors of relapse as well as to evaluate the costs and benefits of maintenance therapy.

Condition Intervention Phase
Schizophrenia Drug: Quetiapine Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Official Title: Duration of Maintenance Anti-psychotic Therapy After First -Episode Schizophrenia: a Double-blind Randomized Placebo-control Relapse Prevention Study

Resource links provided by NLM:

Further study details as provided by The University of Hong Kong:

Primary Outcome Measures:
  • For patients in remission while on maintenance medication, the study investigates whether medication discontinuation can be reached in 12 months following a first episode illness.

Secondary Outcome Measures:
  • Predictors of relapse, and costs and benefits of maintenance therapy in terms of functioning, quality of life, side effects, carer's burden, negative symptoms and cognitive symptoms.

Enrollment: 169
Study Start Date: August 2003
Study Completion Date: June 2007

Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Male or female patients, from 18 to 65 years of age at Visit 1
  • Patients must achieve a level of understanding and expressive capacity sufficient to communicate adequately with the study coordinator and to participate in cognitive testing.
  • Patients must agree to cooperate with all tests and examinations required by the protocol. They must be willing to comply fully with treatment
  • Patient must understand the nature of the study and must sign an informed consent document.
  • Patients must be Cantonese speaking Han Chinese
  • Patients must be diagnosed, according to the SCID for DSM-IV, with schizophrenia, schizoaffective disorder or schizophreniform psychosis.
  • Patients must have good response to anti-psychotic treatment by achieving a rating of 2 or below in Clinical Global Impression Scale (CGI) Severity of illness; a rating of 4 or below in Improvement scale, and a rating of 3 or below in (conceptual disorganization, unusual thought content), a rating of 2 or below in (delusion, hallucinatory behavior) and a rating of 4 or below in (Suspiciousness) of Positive and Negative Syndrome Scale (PANSS) for at least 8 weeks

Exclusion Criteria:

  • Female patients who are either pregnant or lactating.
  • Patients previously on clozapine should be excluded from the study
  • Significant medical illnesses including seizures.
  • DSM-IV substance (alcohol or other drugs) abuse or dependence within the past 3 months.
  • Judged clinically to be at serious suicidal risk.
  • Treatment with an injectable depot neuroleptic within less than one of the patient's dosing intervals between depot neuroleptic injections prior to study entry.
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Please refer to this study by its identifier: NCT00334035

Hong Kong
Research Site
Hong Kong, Hong Kong
Sponsors and Collaborators
The University of Hong Kong
Principal Investigator: Eric YH Chen, MD The University of Hong Kong
  More Information

Publications automatically indexed to this study by Identifier (NCT Number): Identifier: NCT00334035     History of Changes
Other Study ID Numbers: D1441C09906
Study First Received: June 2, 2006
Last Updated: February 17, 2011

Additional relevant MeSH terms:
Schizophrenia Spectrum and Other Psychotic Disorders
Mental Disorders
Quetiapine Fumarate
Antipsychotic Agents
Tranquilizing Agents
Central Nervous System Depressants
Physiological Effects of Drugs
Psychotropic Drugs processed this record on September 21, 2017