The Effects of Treatment With Naltrexone in Alcohol and Cannabis-dependent Patients

Study Overview
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Brief Summary
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Alcohol dependence is a major health problem worldwide and recently in Israel and it has major health care costs. Cannabis dependence is also a major health issue and many cannabis users find it difficult to quit. Similar to dependence on heavy drugs, alcohol and cannabis-dependent patients find it difficult to quit drinking and smoking cannabis and they relapse to drinking alcohol and using cannabis during treatment. Craving for alcohol and cannabis and withdrawal during detoxification are major factors for relapse to drinking and using cannabis. The cue-exposure and priming paradigms have been used in order to induce craving for alcohol and cannabis in the laboratory. Several studies have delineated the brain mechanisms responsible for cue-induced craving for alcohol using functional Magnetic Resonance Imaging (fMRI), a method that can be useful in monitoring progress of treatment. A proven useful medication for treatment of alcohol dependence is the opiate antagonist naltrexone commonly used for treatment of opiate dependence. We have found that cannabis-dependent patients in treatment for cannabis dependence who also were heavy users of alcohol have dropped early from treatment.

Detailed Description
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We propose to use naltexone to reduce craving for alcohol and cannabis in alcohol and cannabis-dependent patients. We also propose to use established techniques of priming and cue-exposure for alcoholic drinks and cannabis together with measures of [18F] Fluorodeoxyglucose (FDG) in Positron Emission Tomography (PET) imaging in 24 alcohol and cannabis-dependent patients before and after 35 day treatment with naltrexone. We predict that in those who will be successful in quitting alcohol drinking and using cannabis there would be a reduction in alcohol and cannabis cue-induced brain activity in the meso-limbic reward circuit that is responsible for craving for alcohol and cannabis.

Official Title
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Brain Imaging Study on the Effects of Treatment With Naltrexone on Cue-induced Craving and Brain's Metabolic Changes in Alcohol and Cannabis-dependent Patients

Conditions
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Alcohol-dependence

Intervention / Treatment
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* Drug: Naltrexone


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Alcohol dependent patients both males and females age 22-64 Exclusion Criteria: subjects who are diagnosed as suffering from psychotic illness according to DSM-IV (Axis 1) (American Psychiatric Association, 1994) or with a history of CNS disease, a history of infection that might affect CNS (HIV, syphilis, cytomegalovirus, herpes), a history of head injury with loss of consciousness, history of other substance abuse taking psychoactive medications (shown by urine test). Abnormal liver test results (150% above average) will be excluded. Pregnancy is also an exclusion criterion, as radiation exposure is risky for the fetus.

Ages Eligible for Study
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Minimum Age: 22 Years
Maximum Age: 64 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Naltrexone<br>Treatment with naltrexone for two months together with psycho-social support | Drug: Naltrexone<br>* Naltrexone, oral 50 mg per day.<br>* Other names: Revia;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Verified abstinence from alcohol | Patients will be tested for alcohol at the end of treatment after 2 months | 2 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in subjective responses to alcohol-cue reactivity and brain's metabolic rates | Alcohol and cannabis-dependent patients undergoing treatment with naltrexone will be assessed before and after treatment by the alcohol-cue exposure together with measures of the brain's metabolism using [18F] Fluoro-dioxyglucose (FDG) as the radiotracer in Positron Emission Tomography (PET) and subjective craving responses to the cues. | At baseline and after treatment | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Alcohol, naltrexone, cue reactivity, PET