Treatment for Cannabis Withdrawal and Dependence
Cannabis is the most widely used illicit drug in the United States, and worldwide, with 1 in 10 users estimated to meet diagnostic criteria for cannabis dependence. Avoidance of withdrawal symptoms (e.g., disturbances in mood, sleep, and craving) is a common relapse precipitant. Cannabis use also impairs executive cognitive functions thereby increasing vulnerability to relapse and reducing the ability to benefit from behavioral therapy. There are no pharmacological treatments for cannabis dependence, despite the large number of afflicted individuals and the limitations of behavioral therapies which do not remediate withdrawal and are associated with high rates of treatment failure. The primary aim of this clinical trial is to evaluate the efficacy and safety of a novel neurokinin1 (NK1) receptor antagonist, aprepitant (Emend), (125mg/day), in outpatients with current cannabis dependence. The main hypothesis to be tested is to evaluate the relative efficacy of aprepitant 125 mg/d vs. placebo for reducing cannabis withdrawal symptoms in cannabis dependent outpatients, specifically anxiety, mood, craving and sleep.
|Study Design:||Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Pharmacological Treatment of Cannabis Withdrawal and Dependence|
- Change in Cannabis Use from Baseline to 12 weeks [ Time Frame: Once per week for 12 weeks ] [ Designated as safety issue: No ]CN-THCCOOH
|Study Start Date:||May 2011|
|Estimated Study Completion Date:||May 2016|
|Estimated Primary Completion Date:||May 2015 (Final data collection date for primary outcome measure)|
Active Comparator: Active Drug
125mg/day for 8 weeks
Other Name: Emend
Placebo Comparator: Placebo pill
125mg/d placebo pill for 8 weeks
Other Name: Placebo
This study will be a Phase II, single-site, 8-week, randomized, double-blind, placebo-controlled, parallel group comparison of aprepitant (125 mg/d) or placebo. Subjects will be 100 outpatients seeking treatment for current cannabis dependence with no clinically significant medical or psychiatric disorders (including substance use disorders or a positive drug screen for substances other than cannabis or nicotine). All subjects will receive weekly manual-guided abstinence-oriented counseling to facilitate showing a drug effect above and beyond available therapies (Weeks 0-8). Research assessments of marijuana use and withdrawal and drug safety and tolerability will occur weekly through the treatment phase of the 8-week study. Post treatment follow-up assessments will occur at Weeks 9 and 12. Neuropsychological testing will occur at Weeks 0 and 4 and 8.
Specific Aim 1: To evaluate the relative efficacy of aprepitant 125 mg/d vs. placebo for reducing cannabis withdrawal symptoms in cannabis dependent outpatients, including anxiety, mood, craving and sleep symptoms.
Specific Aim 2: To evaluate the relative efficacy of aprepitant 125 mg/d vs. placebo for reducing marijuana use in cannabis dependent outpatients.
Specific Aim 3: To evaluate the relative efficacy of aprepitant 125 mg/d vs. placebo for reducing cannabis related impairments in executive functioning in cannabis dependent outpatients.
|Contact: Nick J. Chesher, M.A.||email@example.com|
|United States, California|
|The Scripps Research Institute||Recruiting|
|La Jolla, California, United States, 92037|
|Contact: Nick J. Chesher, M.A. 858-784-7465 firstname.lastname@example.org|
|Principal Investigator: Barbara J Mason, Ph.D.|
|Principal Investigator:||Barbara J Mason, Ph.D.||The Scripps Research Institute|