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Efficacy and Safety of Asenapine With Placebo and Olanzapine (41021)(P05933)

This study has been completed.
Information provided by (Responsible Party):
Merck Sharp & Dohme Corp. Identifier:
First received: September 8, 2005
Last updated: June 12, 2015
Last verified: June 2015

Schizophrenia is a brain disease. The primary features of schizophrenia are characterized by Positive symptoms (symptoms that should not be there, inability to think clearly, to distinguish reality from fantasy i.e., hearing voices) and Negative symptoms (a reduction or absence of normal behaviors or emotions, i.e., unable to manage emotions, make decisions and relate to others). Other symptoms include reduced ability to recall and learn new information, difficulty with problem solving, or maintaining productive employment. The symptoms of schizophrenia may be due to an imbalance in chemicals in the brain, primarily dopamine and serotonin, which enables brain cells to communicate with each other.

Asenapine is an investigational drug that may help to correct the imbalance in dopamine and serotonin. This is a 6 week study to test the efficacy and safety of asenapine and a comparator agent (olanzapine) in the treatment of patients with schizophrenia. Patients that complete this trial will have the option of continuing in an additional one year extension trial.

Condition Intervention Phase
Schizophrenia Drug: asenapine Drug: Placebo Drug: olanzapine Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Multicenter, Randomized, Double-Blind, Fixed-Dose, 6-Week Trial of the Efficacy and Safety of Asenapine Compared With Placebo Using Olanzapine Positive Control in Subjects With an Acute Exacerbation of Schizophrenia

Resource links provided by NLM:

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

Primary Outcome Measures:
  • Change in total PANSS score at endpoint (6-week double-blind or last assessment after baseline) from baseline [ Time Frame: Screen, baseline, Days 4,7,14,21,28,35,42 ]

Secondary Outcome Measures:
  • Changes in PANSS subscale and Marder factor scores; CGI-S scores [ Time Frame: Screen, baseline, Days 4,7,14,21,28,35,42 ]
  • CGI-I scores [ Time Frame: Days 4,7,14,21,28,35,42 ]
  • Neurocognition and cognitive functioning [ Time Frame: Baseline , day 42 ]
  • Anxiety [ Time Frame: Baseline, day 42 ]
  • Suicidal thinking [ Time Frame: Baseline, day 42 ]
  • Quality of life and patient functionality [ Time Frame: Baseline, day 42 ]
  • Readiness to discharge, at scheduled assessments and endpoint from baseline [ Time Frame: Baseline up to day 14 ]
  • Extrapyramidal symptoms [ Time Frame: Baseline, Days 4,7,14,21,28,35,42 ]
  • Laboratory parameters [ Time Frame: Baseline, Days 14,,28,,42 ]
  • Vital signs [ Time Frame: Baseline, Days ,14,21,28,42 ]
  • Weight [ Time Frame: Baseline, Days 14,,28,,42 ]
  • ECGs [ Time Frame: Baseline, Days ,14,,28,,42 ]
  • Adverse events (including serious adverse events) [ Time Frame: Screen, baseline, Days 4,7,14,21,28,35,42 and are are recorded continuously for AEs up to 7 days after endpoint ]
  • SAEs up to 30 days after endpoint [ Time Frame: Screen, baseline, Days 4,7,14,21,28,35,42 and are are recorded continuously for AEs up to 30 days after endpoint ]

Enrollment: 417
Study Start Date: May 2005
Study Completion Date: May 2006
Primary Completion Date: April 2006 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
asenapine 5 mg BID and 10 mg BID
Drug: asenapine
5 mg BID or 10mg BID
Placebo Comparator: 2
Placebo against olanzapine and asenapine
Drug: Placebo
Active Comparator: 3
olanzapine 15 mgQD
Drug: olanzapine
olanzapine 15 mg QD


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

Inclusion Criteria:

  • Currently suffering from an acute exacerbation of schizophrenia. Caregiver required.

Exclusion Criteria:

  • Have an uncontrolled, unstable medical condition. Have any other psychiatric disorder other than schizophrenia as a primary diagnosis.
  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.

No Contacts or Locations Provided
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Merck Sharp & Dohme Corp. Identifier: NCT00156117     History of Changes
Other Study ID Numbers: P05933
Study First Received: September 8, 2005
Last Updated: June 12, 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 processed this record on August 16, 2017