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Efficacy and Safety of Asenapine Compared With Olanzapine in Patients With Persistent Negative Symptoms of Schizophrenia (A7501013)(COMPLETED)(P05771)

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: September 5, 2005
Last Update Posted: September 25, 2015
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Merck Sharp & Dohme Corp.
Treatment with conventional antipsychotics such as haloperidol has little effect or may sometimes even worsen negative symptoms (such as blunted affect, emotional withdrawal, and poor rapport) of schizophrenia. The newer "atypical" antipsychotics agents, such as olanzapine, has shown improvement in the treatment of negative symptoms in acute trials. The purpose of this study is to compare an investigational compound (asenapine) with a marketed agent (olanzapine) in the treatment of stable subjects with persistent negative symptoms of schizophrenia for 6 months. Patients completing this study may be eligible to participate in an extension 6 months of treatment. Patients are required to have stable symptoms prior to entry into study.

Condition Intervention Phase
Schizophrenia Drug: Asenapine Drug: Olanzapine Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Multicenter, Double-Blind, Flexible -Dose, 6-Month Trial Comparing the Efficacy and Safety of Asenapine With Olanzapine in Stable Subjects With Predominant, Persistent Negative Symptoms of Schizophrenia.

Resource links provided by NLM:

Further study details as provided by Merck Sharp & Dohme Corp.:

Primary Outcome Measures:
  • Change From Baseline in Negative Symptoms of Schizophrenia Measured by the Negative Symptom Assessment (NSA) Scale Total Score [ Time Frame: Day 182 ]
    The NSA Scale is a 16-item clinician-rated instrument for rating the negative symptomatology of schizophrenia. Total score ranges from 16 to 96, with greater scores indicating greater severity of symptoms.

Secondary Outcome Measures:
  • Change From Baseline in Quality of Life Measured by the Quality of Life Scale (QLS) Total Score [ Time Frame: Day 182 ]
    The Quality of Life Scale is a 21-item clinician-rated scale for rating psychosocial functioning (Interpersonal Relations, Instrumental Role, Intrapsychic Foundations, and Common Objects and Activities). The score ranges from 0 to 126, with greater values indicating better quality of life.

  • Change From Baseline in Body Weight [ Time Frame: Day 182 ]

Enrollment: 468
Study Start Date: December 2004
Study Completion Date: December 2008
Primary Completion Date: November 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: asenapine Drug: Asenapine
5-10 mg sublingually twice daily for up to 26 weeks
Active Comparator: olanzapine Drug: Olanzapine
5-20 mg by mouth once daily for up to 26 weeks


Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Have a documented current diagnosis of schizophrenia of paranoid, disorganized, catatonic, residual, or undifferentiated subtype with persistent negative symptoms.
  • No increase in level of psychiatric care during the past few months due to worsening of symptoms of schizophrenia.
  • Caregiver required.

Exclusion Criteria:

  • Have an uncontrolled, unstable clinically significant medical condition.
  • Have any other psychiatric disorder other than schizophrenia as a primary diagnosis including depression.
  Contacts and Locations
No Contacts or Locations Provided
  More Information

Responsible Party: Merck Sharp & Dohme Corp.
ClinicalTrials.gov Identifier: NCT00145496     History of Changes
Other Study ID Numbers: P05771
First Submitted: September 1, 2005
First Posted: September 5, 2005
Results First Submitted: March 5, 2010
Results First Posted: March 25, 2010
Last Update Posted: September 25, 2015
Last Verified: September 2015

Additional relevant MeSH terms:
Schizophrenia Spectrum and Other Psychotic Disorders
Mental Disorders
Autonomic Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Gastrointestinal Agents
Antipsychotic Agents
Tranquilizing Agents
Central Nervous System Depressants
Psychotropic Drugs
Serotonin Uptake Inhibitors
Neurotransmitter Uptake Inhibitors
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Serotonin Agents