Vilazodone Treatment for Marijuana Dependence

NCT ID: NCT01574183

Last Updated: 2016-08-10

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2
• Total Enrollment: 76 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2012-08-31
• Study Completion Date: 2016-02-29

Brief Summary

Marijuana is the most commonly used illicit drug, yet few clinical trials have evaluated pharmacotherapy treatments for marijuana dependence. This study will evaluate the efficacy of vilazodone for reducing marijuana use in marijuana-dependent adults. A contingency management intervention (CM)and motivational enhancement therapy (MET)will be incorporated to encourage study engagement and retention, and genomic DNA will be extracted to characterize subjects according to polymorphisms of genes potentially relevant to the activity of vilazodone. It is hypothesized that vilazodone combined with MET and CM will reduce the percent of marijuana-positive urine drug screen results in marijuana-dependent individuals as compared to a placebo treatment combined with MET and CM.

Detailed Description

The purpose of this study is to determine if the medication vilazodone is effective in helping frequent marijuana smokers cut down or stop using marijuana. Vilazodone is FDA approved for the treatment of depression- in this study, vilazodone's effect on marijuana dependence is being investigated.

Participation in the study takes 10 visits over a period of approximately two to three months. The first visit is a screening visit to determine if participants are eligible to participate. After the initial assessment visit, the weekly visits take about 30 minutes, with the exception of three therapy sessions which take approximately 60-90 minutes. The three therapy sessions will focus on participant's marijuana use and reasons they may have for stopping or cutting down on use. After completing an initial therapy session, participants will be randomly selected to receive the study medication, either vilazodone or placebo (a capsule that does not contain any active medication). Participants will have weekly study visits with a clinician. At each study visit, they will be asked to fill out forms and answer specific questions concerning their substance use, anxiety symptoms, and feelings in general. They will be providing urine samples to check for illegal drugs of abuse including marijuana and other drugs. They will also have blood samples drawn during to determine if you are taking the medication as directed.

Conditions

Marijuana Dependence

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: TRIPLE

Study Groups

Vilazodone

Flexible dose up to 40 mg capsule daily

Group Type: EXPERIMENTAL

Vilazodone

Intervention Type: DRUG

up to 40 mg capsule daily

Placebo

Flexible dose up to 40 mg capsule daily

Group Type: PLACEBO_COMPARATOR

Placebo

Intervention Type: DRUG

up to 40 mg capsule daily

Interventions

Vilazodone

up to 40 mg capsule daily

Intervention Type: DRUG

Placebo

up to 40 mg capsule daily

Intervention Type: DRUG

Other Intervention Names

Viibryd

Eligibility Criteria

Inclusion Criteria

• Must meet DSM-IV criteria for marijuana dependence
• Must be between the ages of 18 and 65 years old
• If female and of childbearing potential, must agree to use acceptable method of birth control for duration of the trial.
• Cannabis-positive urine drug screen at screening
• Must consent to random assignment
• Must be able to read and provide informed consent

Exclusion Criteria

• Women who are pregnant, nursing, or plan to become pregnant during course of study
• Must not have a history of or current psychotic disorder, bipolar disorder, or eating disorder
• Must not pose a current suicidal or homicidal risk
• Must not have evidence or history of serious medical disease
• Must not require concomitant therapy with psychotropic medication or CYP3A4 inhibitors
• Must not be currently dependent on other substances, with the exception of nicotine;
• Patients who, in the investigator's opinion, would be unable to comply with study procedures or assessments

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

National Institute on Drug Abuse (NIDA)

NIH

Sponsor Role: collaborator

Medical University of South Carolina

OTHER

Sponsor Role: lead

Responsible Party

Aimee McRae-Clark

Associate Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Aimee L McRae-Clark, PharmD, BCPP

Role: PRINCIPAL_INVESTIGATOR

Medical University of South Carolina

Locations

Medical University of South Carolina

Charleston, South Carolina, United States

Countries

United States

Other Identifiers

R21DA034089

Identifier Type: NIH

Identifier Source: secondary_id

View Link

16488

Identifier Type: -

Identifier Source: org_study_id