6-Month Extension Trial of Asenapine With Olanzapine in Negative Symptom Patients Who Completed the Protocol 25543 (25544)(P05777)

This study has been completed.
Information provided by (Responsible Party):
Merck Sharp & Dohme Corp.
ClinicalTrials.gov Identifier:
First received: December 12, 2005
Last updated: February 20, 2015
Last verified: February 2015

This is an extension study to further test

the efficacy and safety of asenapine compared with a

marketed agent (olanzapine) in the treatment of patients with

persistent negative symptoms of schizophrenia.

Condition Intervention Phase
Drug: asenapine
Drug: olanzapine
Phase 3

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Multicenter, Double-Blind, Flexible-Dose, 6-Month Extension Trial Comparing the Safety and Efficacy of Asenapine With Olanzapine in Subjects Who Completed the Protocol 25543 (NCT 00212836; P05817)

Resource links provided by NLM:

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

Primary Outcome Measures:
  • Long-term Change in Negative Symptoms of Schizophrenia Measured by the Negative Symptom Assessment (NSA) Scale [ Time Frame: Baseline of Protocol 25543 (NCT 00212836) to 365 days (total time for both protocols 25543 & 25544) ] [ Designated as safety issue: No ]
    Decrease from baseline in the NSA scores indicates improvement of efficacy. Range NSA total score is 16 [best]-96 [worst].

Secondary Outcome Measures:
  • Change in Quality of Life Measured by Quality of Life Scale (QLS) [ Time Frame: Baseline of Protocol 25543 (NCT 00212836) to 365 days (total time for both protocols 25543 & 25544) ] [ Designated as safety issue: No ]
    Increase from baseline in the QLS scores indicates improvement of efficacy. Range QLS total score is 0 [worst]-126 [best].

Enrollment: 306
Study Start Date: December 2005
Study Completion Date: January 2008
Primary Completion Date: December 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Drug: asenapine
5-10 mg sublingually twice daily for 26 weeks
Active Comparator: 2
Drug: olanzapine
5-20 mg by mouth once daily for 26 weeks


Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Continue to meet all demographic and procedural

inclusion criteria of the 25543 trial (NCT 00212836; P05817) to enter into

this extension trial.

  • Have demonstrated an acceptable

degree of compliance and completed the 25543

trial, and would benefit from continued treatment

according to the investigator.

Exclusion Criteria:

  • Have an uncontrolled, unstable clinically significant

medical condition.

  • Have been judged to be medically

noncompliant in the management of their disease.

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  More Information

Responsible Party: Merck Sharp & Dohme Corp.
ClinicalTrials.gov Identifier: NCT00265343     History of Changes
Other Study ID Numbers: P05777  25544  Aphrodite 
Study First Received: December 12, 2005
Results First Received: February 17, 2010
Last Updated: February 20, 2015
Health Authority: Finland: Finnish Medicines Agency

Additional relevant MeSH terms:
Antipsychotic Agents
Autonomic Agents
Central Nervous System Agents
Central Nervous System Depressants
Gastrointestinal Agents
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Neurotransmitter Uptake Inhibitors
Peripheral Nervous System Agents
Pharmacologic Actions
Physiological Effects of Drugs
Psychotropic Drugs
Serotonin Agents
Serotonin Uptake Inhibitors
Therapeutic Uses
Tranquilizing Agents

ClinicalTrials.gov processed this record on May 03, 2016