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Effectiveness of Tropisetron Plus Risperidone for Improving Cognitive and Perceptual Disturbances in Schizophrenia

This study has been completed.
National Institute of Mental Health (NIMH)
Information provided by (Responsible Party):
Thomas R. Kosten, MD, Baylor College of Medicine Identifier:
First received: February 13, 2007
Last updated: August 12, 2014
Last verified: August 2014
Results First Received: August 1, 2013  
Study Type: Interventional
Study Design: Allocation: Randomized;   Endpoint Classification: Pharmacodynamics Study;   Intervention Model: Parallel Assignment;   Masking: Double Blind (Subject, Investigator);   Primary Purpose: Treatment
Conditions: Smoking Cessation
Interventions: Drug: Tropisetron
Drug: Placebo
Drug: Risperidone

  Participant Flow
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Recruitment Details
Key information relevant to the recruitment process for the overall study, such as dates of the recruitment period and locations
The recruitment period began in May 2006 and ended in April 2011. Participants were approached for participation in this study after being hospitalized for at least 2 weeks if they were schizophrenic and capable of providing written informed consent.

Pre-Assignment Details
Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
After signing informed consent for participation in the study, subjects were interviewed by study doctor and all medical and psychiatric data were reviewed prior to admitting the subject and beginning medication.

Reporting Groups
Tropisetron Tropisetron (10mg/day) + risperidone(6mg/day)
Placebo Placebo + risperidone (6mg/day)

Participant Flow:   Overall Study
    Tropisetron   Placebo
STARTED   90   89 [1] 
COMPLETED   68   69 [2] 
NOT COMPLETED   22   20 
Adverse Event                8                8 
Withdrawal by Subject                10                10 
Antipsychotic medication changed                4                2 
[1] The recruitment restarted in August, 2010.
[2] The entire recruitment has been completed in December, 2011.

  Baseline Characteristics
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Population Description
Explanation of how the number of participants for analysis was determined. Includes whether analysis was per protocol, intention to treat, or another method. Also provides relevant details such as imputation technique, as appropriate.
No text entered.

Reporting Groups
Tropisetron Tropisetron (10mg/day) + risperidone(6mg/day)
Placebo Placebo + risperidone (6mg/day)
Total Total of all reporting groups

Baseline Measures
    Tropisetron   Placebo   Total
Overall Participants 
[units: participants]
 90   89   179 
[units: participants]
<=18 years   0   0   0 
Between 18 and 65 years   90   89   179 
>=65 years   0   0   0 
[units: years]
Mean (Standard Deviation)
 28.8  (9.2)   28.3  (9.9)   28.6  (9.6) 
[units: participants]
Female   52   50   102 
Male   38   39   77 
Region of Enrollment 
[units: participants]
China   90   89   179 

  Outcome Measures

1.  Primary:   Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) Cognition Domains   [ Time Frame: end of 12 wk treatment ]

  Serious Adverse Events

  Other Adverse Events

  Limitations and Caveats
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Limitations of the study, such as early termination leading to small numbers of participants analyzed and technical problems with measurement leading to unreliable or uninterpretable data
Since all participants were the first episode and drug naive patients, some participants quit before the completion of the entire clinical trial

  More Information
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Certain Agreements:  
Principal Investigators are NOT employed by the organization sponsoring the study.
There is NOT an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.

Results Point of Contact:  
Name/Title: Dr. Thomas R. Kosten
Organization: Baylor College of Medicine
phone: (713) 794-7032

Publications automatically indexed to this study by Identifier (NCT Number):

Responsible Party: Thomas R. Kosten, MD, Baylor College of Medicine Identifier: NCT00435370     History of Changes
Other Study ID Numbers: U01MH079639 ( US NIH Grant/Contract Award Number )
Study First Received: February 13, 2007
Results First Received: August 1, 2013
Last Updated: August 12, 2014
Health Authority: United States: Federal Government