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Double Blind Study of Vigabatrin for the Treatment of Cocaine Dependence

This study has been completed.
Catalyst Pharmaceuticals, Inc.
Information provided by:
New York University School of Medicine Identifier:
First received: September 10, 2007
Last updated: April 7, 2008
Last verified: April 2008
The primary objective of this study is to assess the efficacy of vigabatrin for the treatment of cocaine dependence, based on the twice-weekly qualitative urine toxicologies for cocaine. Based on two prior unblinded human studies and 15 years of animal studies, this 100 subject double- blind, randomized study is designed to show if with vigabatrin treatment but not placebo, even non-hospitalized cocaine dependent individuals with ready access to cocaine will become cocaine abstinent if they are self motivated to stop their cocaine habit. To accomplish this, cocaine dependent subjects will be randomly assigned to either a placebo or vigabatrin treatment group and treated for a nine week period. The primary hypothesis is that as compared to the placebo arm, the vigabatrin treatment arm will show a significant increase in the number of subjects who are abstinent for the final 3 weeks of the study.

Condition Intervention Phase
Cocaine Dependence
Drug: Vigabatrin
Drug: Placebo
Behavioral: Group therapy
Phase 2

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: Double-Blind, Randomized, Placebo- Controlled Trial of Vigabatrin for Short Term Abstinence From Cocaine in Cocaine Dependent Parolees

Resource links provided by NLM:

Further study details as provided by New York University School of Medicine:

Primary Outcome Measures:
  • Three consecutive weeks of negative urine tests (benzoyl ecgonine) for cocaine use (no slips allowed). [ Time Frame: These must be the last three weeks (7,8,9) of the trial. ]

Secondary Outcome Measures:
  • 3 consecutive weeks of negative urines (one slip allowed) [ Time Frame: Last 3 weeks (7,8,9) of the trial ]
  • cocaine craving [ Time Frame: Weeks 1, 5,9 ]

Enrollment: 100
Study Start Date: April 2007
Study Completion Date: November 2007
Primary Completion Date: November 2007 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: A
Subjects will receive vigabatrin in escalating doses to 3 grams per day over three weeks, continued for 4 weeks and then tapered to zero over the next 2 weeks.
Drug: Vigabatrin
crystalline drug dissolved in orange juice, dosage escalates from 500 mg twice daily to 1.5 g twice daily over a 3 week period. This dose is maintained for 4 weeks and then tapered to zero over the next two weeks
Other Names:
  • Sabril
  • CPP 109
  • gamma vinyl GABA
  • GVG
Behavioral: Group therapy
Participants attend group sessions once a week
Placebo Comparator: B
Orange juice and administration identical to Arm A.
Drug: Placebo
orange juice is administered twice daily in containers indistinguishable from the treatment arm.
Behavioral: Group therapy
Participants attend group sessions once a week


Ages Eligible for Study:   18 Years to 55 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

In order to participate in the study, subjects must

  • Be at least 18 years of age and no older than 55 years of age.
  • Weigh more than 100 pounds.
  • Have a DSM-IV diagnosis of cocaine dependence.
  • Be seeking treatment for cocaine dependence.
  • Have a urine sample positive for qualitative cocaine toxicology at initial screening.
  • Have the ability to understand, and having understood, provide written informed consent to comply with the treatment protocol.
  • Have a history and brief physical examination that demonstrate no clinically significant contraindication for participating in the study, in the judgment of the admitting physician and the Principal Investigator.
  • Have normal, or, if necessary, corrected visual acuity, visual fields, and normal fundoscopy findings

Exclusion Criteria:

  • In order to participate in the study, subjects must not:

    • Meet DSM-IV criteria for current dependence on any psychoactive substance other than cocaine, alcohol, nicotine, or marijuana or physiological dependence on alcohol requiring medical detoxification.
    • Have neurological or psychiatric disorders such as: psychosis, bipolar illness, major depression, organic brain disease, dementia, any disorder which would require ongoing treatment or which would make study agent compliance difficult, history of suicide attempts assessed and/or current suicidal ideation/plan.
    • Have serious medical illnesses or other potentially life threatening or progressive medical illness other than addiction that may compromise subject safety or study conduct.
    • Have a history of traumatic head injury.
    • Be mandated by a court to obtain treatment for cocaine dependence.
    • Have been treated for cocaine addiction, or abstained from cocaine use for a significant period, within the 6 months preceding screening.
    • Be unable to complete the study protocol because of probable incarceration or relocation from the clinical area.
    • Have AIDS (although AIDS is an exclusion criterion, a positive antibody titer to HIV is not).
    • Have active syphilis that has not been treated or refuse treatment for syphilis
    • Have a history of neuroleptic malignant syndrome.
    • Have known or suspected hypersensitivity to vigabatrin or any other GABAergic drug.
    • Have received a drug with known potential for toxicity to a major organ system within 30 days prior to study entry (e.g., isoniazid, methotrexate).
    • Have participated in any experimental study within 4 weeks, or participated in any clinical trial utilizing vigabatrin.
    • Be pregnant or lactating.
    • Have any clinically significant abnormal laboratory value.
    • Have had electroconvulsive therapy with the 3 months preceding screening.
    • Have had any opiate-substitutes (methadone, LAAM, buprenorphine) within 2 months preceding screening.
    • Have a history of i.v. cocaine (or other psychoactive drug) use within 2 months preceding screening.
    • Have a current or past history of seizure disorder, including alcohol- or stimulant related seizure, febrile seizure, or significant family history of idiopathic seizure disorder.
    • Have a visual field defect, or factor predisposing to visual field defects, including glaucoma, severe myopia, retinal disorder, cataracts, diabetes or uncontrolled hypertension.
    • Have my illness, condition, and use of medications, in the opinion of the Principal Investigator and the admitting physician, which would preclude safe or successful completion of the study.
    • Be using vigabatrin or any medication that could interact adversely with vigabatrin administration, based on the longest time interval of A or B below:

      • A) Five half-lives of other medication or active metabolite(s), whichever is longer;
      • B) Two weeks.
    • Be lactose intolerant.
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Please refer to this study by its identifier: NCT00527683

Clinica Integral de Tratamiento Contra las Adicciones SA de CV
Mexico City, Mexico, D.F., Mexico, 11560
Sponsors and Collaborators
New York University School of Medicine
Catalyst Pharmaceuticals, Inc.
Principal Investigator: Jonathan D Brodie, Ph.D., M.D. New York University School of Medicine
Study Director: Emilia Figueroa, M.D. Clinica Integral de Tratamiento Contra las Adicciones, S.A de C.V.
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Jonathan D. Brodie, PhD, MD, Professor, Dept. of Psychiatry, New York University School of Medicine Identifier: NCT00527683     History of Changes
Other Study ID Numbers: H06-152
Study First Received: September 10, 2007
Last Updated: April 7, 2008

Keywords provided by New York University School of Medicine:
cocaine dependence

Additional relevant MeSH terms:
Cocaine-Related Disorders
Substance-Related Disorders
Chemically-Induced Disorders
Mental Disorders
Anesthetics, Local
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Vasoconstrictor Agents
Dopamine Uptake Inhibitors
Neurotransmitter Uptake Inhibitors
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Dopamine Agents
Neurotransmitter Agents
Enzyme Inhibitors
GABA Agents processed this record on April 28, 2017