- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02949934
Effects of Cortical Dopamine Regulation on Drinking, Craving, and Cognitive Control
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Phase 2
Contacts and Locations
Study Locations
-
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South Carolina
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Charleston, South Carolina, United States, 29403
- Medical University of South Carolina
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Age 21-40 (to focus on an age group still on a trajectory of increasing alcohol consumption).
- Meets Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5) criteria for current Alcohol Use Disorder.
- Currently not engaged in, and does not want treatment for, alcohol-related problems.
- Able to read and understand questionnaires and informed consent.
- Lives within 50 miles of the study site.
- Able to maintain abstinence from alcohol for two days (without the aid of detoxification medications), as determined by self report and breathalyzer measurements.
Exclusion Criteria:
- Current DSM-5 diagnosis of any other substance use disorder except Nicotine Use Disorder.
- Any psychoactive substance use (except marijuana and nicotine) within the last 30 days, as indicated by self-report and urine drug screen. For marijuana, no use within the last seven days by verbal report and negative (or decreasing) urine tetrahydrocannibinol (THC) levels.
- Current DSM-5 Axis I diagnosis, including major depression, panic disorder, obsessive-compulsive disorder, post-traumatic stress disorder, bipolar affective disorder, schizophrenia, dissociative disorders, eating disorders, or any other psychotic or organic mental disorder.
- Current suicidal ideation or homicidal ideation.
- Need for maintenance or acute treatment with any psychoactive medication, including antiepileptic medications.
- Currently taking medication known to affect alcohol intake (e.g., disulfiram, naltrexone, acamprosate, topiramate).
- History of severe alcohol withdrawal (e.g., seizure, delirium tremens), as evidenced by self-report and assessment with Clinical Institute Withdrawal Assessment for Alcohol-Revised (CIWA-Ar).
- Clinically significant medical problems such as cardiovascular, renal, gastrointestinal, or endocrine problems that would impair participation or limit medication ingestion.
- Past alcohol-related medical illness, such as gastrointestinal bleeding, pancreatitis, or peptic ulcer.
- Current or past hepatocellular disease, as indicated by verbal report or elevations of alanine aminotransferase (ALT) or aspartate aminotransferase (AST) greater than the upper limit of the normal range at screening.
- Females of childbearing potential who are pregnant (by urine human chorionic gonadotropin), nursing, or who are not using a reliable form of birth control.
- Current charges pending for a violent crime (not including drinking while intoxicated).
- Lack of a stable living situation.
- Presence of ferrous metal in the body, as evidenced by metal screening and self-report.
- Severe claustrophobia or morbid obesity that preclude placement in the MRI scanner.
- History of head injury with > 2 minutes of unconsciousness.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Placebo Comparator: Placebo/rs4680 val/val
Placebo three times per day for eight days Individuals with the rs4680 val/val genotype |
|
Active Comparator: Tolcapone/rs4680 val/val
Tolcapone 100 mg three times per day for three days Tolcapone 200 mg three times per day for five days Individuals with the rs4680 val/val genotype |
Other Names:
|
Placebo Comparator: Placebo/rs4680 val/met
Placebo three times per day for eight days Individuals with the rs4680 val/met genotype |
|
Active Comparator: Tolcapone/rs4680 val/met
Tolcapone 100 mg three times per day for three days Tolcapone 200 mg three times per day for five days Individuals with the rs4680 val/met genotype |
Other Names:
|
Placebo Comparator: Placebo/rs4680 met/met
Placebo three times per day for eight days Individuals with the rs4680 met/met genotype |
|
Active Comparator: Tolcapone/rs4680 met/met
Tolcapone 100 mg three times per day for three days Tolcapone 200 mg three times per day for five days Individuals with the rs4680 met/met genotype |
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Total Number of Standard Drinks Per Day Consumed During Natural (Usual Environment) Conditions
Time Frame: Days 1-6 of study medication ingestion
|
Number of standard alcoholic drinks per day that participants reported consuming, as assessed by the Timeline Follow-back method.
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Days 1-6 of study medication ingestion
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Total Number of Drinks Under Controlled Conditions (Bar Lab)
Time Frame: 2 hours during the alcohol challenge procedure
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Total number of drinks, out of 8 possible, that participants chose to consume in the bar laboratory after receipt of a priming drink, targeted by sex and body weight to produce a breath alcohol concentration of 0.03 g/dL.
Each of the drinks that participants chose to consume was targeted to produce a breath alcohol concentration of 0.015 g/dL.
Participants were given a "bar credit" of $16 with which to "purchase" drinks, at the cost of $2/drink, and were told that any money they did not spend would be given to them the following day.
|
2 hours during the alcohol challenge procedure
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Alcohol Cue-elicited Brain Activation (fMRI)
Time Frame: 7 days--change between baseline and scan on day 7
|
Magnitude of change between baseline and day 7 scan in the right inferior frontal gyrus blood oxygenation level dependent (BOLD) signal to alcohol cues, relative to neutral beverage cues (alcohol cue reactivity task described in Schacht et al., 2013, Neuropsychopharmacology)
|
7 days--change between baseline and scan on day 7
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Cognitive-control-associated Brain Activation (fMRI)
Time Frame: 7 days--change between baseline and scan on day 7
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Magnitude of change between baseline and day 7 scan in the BOLD signal in the right inferior frontal gyrus to spatial working memory
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7 days--change between baseline and scan on day 7
|
Collaborators and Investigators
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimated)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- Pro00050157
- P50AA010761 (U.S. NIH Grant/Contract)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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