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Trial of DMXB-A in Schizophrenia

This study is currently recruiting participants.
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Verified December 2015 by VA Office of Research and Development
Information provided by (Responsible Party):
VA Office of Research and Development Identifier:
First received: December 23, 2004
Last updated: December 4, 2015
Last verified: December 2015
The study hypothesis is that 3-2,4 dimethoxybenzylidene anabaseine (DMXB-A), an orally administered nicotinic cholinergic agonist, will improve attention and other neuropsychological dysfunctions in schizophrenia, leading to improved psychosocial outcome.

Condition Intervention Phase
Schizophrenia Drug: 3-2,4 dimethoxybenzylidene 75 or 150 mg bid Drug: Placebo Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Phase 2 Trial of 3-2,4 Dimethoxybenzylidene Anabaseine in Schizophrenia

Resource links provided by NLM:

Further study details as provided by VA Office of Research and Development:

Primary Outcome Measures:
  • Neurocognitive performance [ Time Frame: 1 month ]

Secondary Outcome Measures:
  • Psychosocial function [ Time Frame: 1 month ]

Estimated Enrollment: 36
Study Start Date: January 2005
Estimated Study Completion Date: December 2016
Estimated Primary Completion Date: December 2015 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Arm 1: Experimental Drug
Experimental Drug
Drug: 3-2,4 dimethoxybenzylidene 75 or 150 mg bid
3-2,4 dimethoxybenzylidene 75 or 150 mg bid
Placebo Comparator: Arm 2: Placebo
Drug: Placebo

Detailed Description:

The objective of the trial is to determine if dosing DMXB-A twice daily for 4 weeks will improve cognition and be safe. Secondary goals are to determine if these neurocognitive effects also have effects on neurobiological paradigms previously shown to be responsive to nicotinic receptor stimulation: suppression of P50 auditory evoked response, saccadic intrusions during smooth pursuit eye movements, and hemodynamic activity in the hippocampus during smooth pursuit eye movements as measured by fMRI. The purpose of these neurobiological measures is to assess whether the response to DMXB-A is consistent with activation of nicotinic receptors. In addition, the investigators will assess clinical response using a battery of clinical assessment scales and assessments of daily living functions. The purpose of these assessments is to address the FDA requirement of a clinical effect beyond change in laboratory neuropsychological performance. This study and the subsequent two studies will also include assessments of the safety of DMXB-A and related compounds.

The purpose of the trial is to lay the groundwork for Phase III investigation. If this trial finds that DMXB-A has effects at a safe dose, without tachyphylaxis, then the investigators intend to proceed to a Phase III trial, where the clinical importance of this effect can be measured.

The trial will be a double blind trial with placebo control. The order of doses and placebo will be randomized.

The Phase 1 study was completed in January, 2005, with 12 non-smoking schizophrenics subjects. The subjects were concurrently treated with neuroleptics throughout the study. They received 3 treatments, each for 1 day, in a double-blind crossover design. The treatments were DMXB-A (150 mg + 75 mg 2 hours later), DMXB-A (75 mg + 37.5 mg 2 hours later), and placebo. A significant effect on neurocognition, as measured by the Repeatable Battery for Assessment of Neuropsychological Status, and on sensory gating, as measured by P50 auditory evoked potentials was observed. Subjects reported no significant symptoms. One subject's white blood cell count decreased from just above normal limits on placebo to just below normal levels on DMXBA (150 + 75 mg 2 hours later). He did not receive further exposure to drug and his white blood cell count returned to normal at the next testing, 2 days later.


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Schizophrenia
  • Currently treated with neuroleptic drugs

Exclusion Criteria:

  • Treatment with clozapine;
  • Head injury or neurological condition;
  • Cardiovascular disease;
  • Substance abuse or dependence, including nicotine
  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: NCT00100165

Contact: Robert Freedman, MD (303) 315-0626

United States, Colorado
VA Eastern Colorado Health Care System, Denver, CO Recruiting
Denver, Colorado, United States, 80220
Contact: Robert Freedman, MD    303-315-0626   
Principal Investigator: Robert Freedman, MD         
Sponsors and Collaborators
VA Office of Research and Development
Principal Investigator: Robert Freedman, MD VA Eastern Colorado Health Care System, Denver, CO
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: VA Office of Research and Development Identifier: NCT00100165     History of Changes
Other Study ID Numbers: 57710-2
VISN 19 MIRECC ( Other Grant/Funding Number: VA )
Study First Received: December 23, 2004
Last Updated: December 4, 2015

Keywords provided by VA Office of Research and Development:

Additional relevant MeSH terms:
Schizophrenia Spectrum and Other Psychotic Disorders
Mental Disorders processed this record on August 21, 2017