Investigation of the Drug Dimethoxbenzylidene Anabaseine in Treating Schizophrenia Patients

This study is currently recruiting participants. (see Contacts and Locations)
Verified December 2014 by University of Colorado, Denver
Information provided by (Responsible Party):
University of Colorado, Denver Identifier:
First received: November 16, 2005
Last updated: December 2, 2014
Last verified: December 2014

This study will determine the effectiveness of a drug, dimethoxbenzylidene anabaseine, in producing beneficial effects similar to that of nicotine in individuals with schizophrenia.

Condition Intervention Phase
Psychotic Disorders
Drug: Dimethoxybenzylidene anabaseine (DMXB-A)
Drug: Placebo
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Phase 1 Trial of 3-2,4 Dimethoxbenzylidene Anabaseine in Schizophrenia

Resource links provided by NLM:

Further study details as provided by University of Colorado, Denver:

Primary Outcome Measures:
  • MATRICS-CCB-Total Scale Score [ Time Frame: Measured at Month 1 ] [ Designated as safety issue: No ]
    National Institute of Mental Health (NIMH) Measurement and Treatment Research to Improve Cognition in Schizophrenia Consensus Cognitive Battery Statistically Adjusted-score (MATRICS-CCB) is a neuro-cognitive test

Secondary Outcome Measures:
  • Brief Psychiatric Rating Scale [ Time Frame: 1 month ] [ Designated as safety issue: No ]
    Brief Psychiatric Rating Scale (BPRS) is a rating scale used to measure psychiatric symptoms

  • Scale for the Assessment of Negative Symptoms [ Time Frame: 1 month ] [ Designated as safety issue: No ]
    Scale for the Assessment of Negative Symptoms (SANS) is a rating scale to measure negative symptoms

Other Outcome Measures:
  • Hippocampal BOLD response [ Time Frame: 1 month ] [ Designated as safety issue: No ]
    Hippocampal BOLD response in resting state Functional magnetic resonance imaging (fMRI)

Estimated Enrollment: 100
Study Start Date: March 2004
Estimated Study Completion Date: September 2016
Estimated Primary Completion Date: June 2016 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Dimethoxybenzylidene anabaseine
Participants will take active experimental medication (Dimethoxybenzylidene anabaseine (DMXB-A) )
Drug: Dimethoxybenzylidene anabaseine (DMXB-A)
DMXB-A 150 mg sustained release bid
Placebo Comparator: Placebo
Participants will take placebo.
Drug: Dimethoxybenzylidene anabaseine (DMXB-A)
DMXB-A 150 mg sustained release bid
Drug: Placebo
Placebo dosed to match active medication

Detailed Description:

Schizophrenia is a chronic and severe brain disorder that can significantly impact quality of life. It is characterized by delusions, paranoia, and disordered thinking. The cause of schizophrenia has not yet been determined. However, there are many treatments, including drug therapy and cognitive behavioral therapy, that may help to alleviate symptoms of the condition. Nicotinic receptors are involved in a number of biological processes; they are numerous throughout the central and peripheral nervous systems and are diverse in structure and expression. Genetic and neurobiological research has identified decreased expression of the a7 nicotinic receptor as an element in schizophrenia that is related to poor psychosocial outcome. Data indicate that drug therapy may reduce this deficit in receptor expression. Nicotine has been found to stimulate the a7 nicotinic receptor; however, the physiological dependence associated with nicotine makes it an undesirable option. Dimethoxbenzylidene anabaseine (DMXB-A) can stimulate the a7 nicotinic receptor; its advantages include easy oral administration and the lack of dependence-causing effects. This study will determine whether DMXB-A can safely and effectively stimulate the a7 nicotinic receptor in schizophrenia patients and reduce their neurobiological symptoms.

This study will last 6 weeks. Participants will have study visits each week for the duration of the study. During each visit, participants will be randomly assigned to receive either DMXB-A or placebo. An electrocardiogram (EKG) will measure the heart function of participants and participants' blood pressure will be measured. After the first dose of either DMXB-A or placebo, participants will receive a second dose 2 hours later. An evoked potential test, which measures the brain's response to stimuli, will be performed after both doses. Neuropsychological tests, such as verbal reasoning and visual retention, will be performed following the second dose of either DMXB-A or placebo.


Ages Eligible for Study:   18 Years to 60 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Diagnosis of schizophrenia

Exclusion Criteria:

  • History of cardiovascular illness or neurological illness other than schizophrenia
  • Current substance abuse, including nicotine
  • History of clozapine use
  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.

Please refer to this study by its identifier: NCT00255918

Contact: Robert Freedman, MD 303-315-8403

United States, Colorado
University of Colorado General Clinical Research Center Recruiting
Denver, Colorado, United States, 80262
Contact: Robert Freedman, MD    303-315-8403   
Principal Investigator: Robert Freedman, MD         
Sub-Investigator: Ann Olincy, MD         
Sponsors and Collaborators
University of Colorado, Denver
Principal Investigator: Robert Freedman, MD University of Colorado, Denver
  More Information

Responsible Party: University of Colorado, Denver Identifier: NCT00255918     History of Changes
Other Study ID Numbers: 03-0857, R01MH061412, DNBBS MC-R
Study First Received: November 16, 2005
Last Updated: December 2, 2014
Health Authority: United States: Food and Drug Administration

Keywords provided by University of Colorado, Denver:
Evoked Potentials
Receptors, Nicotinic

Additional relevant MeSH terms:
Mental Disorders
Psychotic Disorders
Schizophrenia and Disorders with Psychotic Features
Cholinergic Agents
Cholinergic Agonists
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Nicotinic Agonists
Pharmacologic Actions
Physiological Effects of Drugs processed this record on May 21, 2015