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Completed

NCT Number: NCT00107588

Marijuana Treatment Project - 3

The goal of this research is to improve treatment outcome for marijuana-dependent individuals. The current study builds on the findings of our prior NIDA-funded marijuana treatment study in which improved client outcomes were associated with greater treatment attendance, greater client self-efficacy, and greater use of coping skills. We will use a contingency management paradigm to provide tangible reinforcement for completing homework assignments that are designed to enhance coping skills. It is anticipated that this will result in greater homework compliance, leading to greater self-efficacy regarding one's ability to cope with high-risk situations. Improved self-efficacy will enhance the likelihood of employing coping skills in high-risk situations, thereby increasing the probability of achieving and maintaining abstinence.

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Key information

Conditions

Marijuana Dependence Chemically-Induced Disorders Marijuana Abuse Mental Disorders Substance-Related Disorders

Age range

18 year–80 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Connecticut Health Center

Farmington, Connecticut, 06030-3910, United States

About this study

Participants will receive an intervention combining one session of motivational enhancement therapy with eight sessions of cognitive-behavioral coping skills therapy (MET+CBT). A contingency management procedure will be added to this intervention, providing reinforcement for completion of homework, as verified by call-ins to an Interactive Voice Recording (IVR) system. Outcomes will be compared to an MET+CBT intervention in which reinforcement will be provided for marijuana-free urine specimens, and to a control group that receives Case Management. Recruitment of 234 marijuana-dependent participants will occur over a three-year period. They will be randomly assigned to one of the three 9-session interventions. Treatment will be individual, manualized, and provided on an outpatient basis. Pretreatment assessments will obtain baseline data; follow-up assessments at three-month intervals for one year will evaluate marijuana use outcomes, other drug or alcohol use, and psychosocial functioning. It is anticipated that the intervention in which completion of homework is reinforced will result in the best outcomes. The mechanisms by which the interventions result in behavior change will be the specific focus of attention in this study.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Cannabis dependence
  • Willing to accept random assignment to interventions

Exclusion criteria

  • Current dependence on alcohol or other drugs
  • Problems that require inpatient hospitalization
  • Reading ability below fifth grade level
  • Lack of reliable transportation to treatment
  • Excessive commuting distance

Treatment and study plan

Reinforcement for homework completion

Behavioral

Provides contingent reinforcement for engaging in homework activities designed to enhance coping skills

Reinforcement for Abstinence

Behavioral

Provides contingent reinforcement for submitting marijuana-free urine specimen

Case Management

Behavioral

Will control for the effect of therapist-client contact by providing supportive case management as an active control condition.

Primary outcomes

  1. Marijuana abstinence

    Time frame: One-year follow-up period

  2. Self-efficacy, use of coping skills, and treatment attendance

    Time frame: During 2-month treatment period

Secondary outcomes

  1. Continuous abstinence will be predicted by (a) treatment attendance; (b) posttreatment self-efficacy for coping; and (c) use of coping skills

    Time frame: One-year follow-up period

Sponsors and collaborators

Lead sponsor

UConn Health

Other

Collaborators

  • National Institute on Drug Abuse (NIDA)

Registry information

Official study title

Contingency Management for Marijuana Dependence

Acronym: MTP-3

Important dates

Study start
2007
Primary completion
2011
Study completion
2012
First posted
Apr 6, 2005
Registry last updated
Jul 28, 2017

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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