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Completed

NCT Number: NCT04965012

Testing the Efficacy of an Online Treatment Program for Heavy Cannabis Use

Cannabis is a frequently-used psychoactive substance. While the majority of individuals can use cannabis without experiencing problems, a small minority of people develop cannabis problems. Despite the small-to-medium reported effect sizes of cognitive behavioural therapy (CBT) and motivational enhancement therapy (MET) treatments for cannabis misuse, many cannabis users do not seek treatment. Online CBT/MET programs have the potential to be cost-effective and accessible, and offer a less stigmatizing option for treatment. These programs may also help capture cannabis users who experience subclinical problems, who are not captured by traditional treatment. Existing treatment programs also need to be adapted to maximize participant retention and increase treatment completion, as many current cannabis use treatment programs have significant drop-out rates. Hence, the goal of the proposed randomized controlled trial (RCT) is to examine the efficacy of an online evidence-based CBT/MET treatment program. Outcomes of a combined CBT/MET treatment program will be compared to a CBT-only treatment program and a waitlist control. This research will provide insight into the novel contribution of MET to online CBT treatment programs for cannabis misuse.

The researchers are hoping to recruit 303 participants for this study from Central and Eastern Canada. Participants will be randomly assigned to one of the treatment groups (i.e., CBT with MET, CBT without MET) or the psychoeducational control group. Individuals in either treatment group will be given 6 weeks to work through 8 online modules. Throughout the modules, participants will identify goals related to cannabis use, learn strategies to cope with cannabis cravings, triggers, and social pressures and learn to prevent relapse. Participants randomly assigned to the control (i.e., psychoeducation) will receive links to websites that provide general psychoeducation about cannabis use and wellbeing. All participants will complete online assessment measures at baseline, end of treatment, and at follow up approximately one month later (i.e., 0 weeks, 6 weeks, 10 weeks) in order to assess the efficacy of the treatment. At the end of the study, individuals in the control group will be given access to the CBT without MET treatment.

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Key information

Conditions

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

Age range

19 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Manitoba, Winnipeg, Manitoba, Canada

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Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • Ages 19+
  • Living in Manitoba or Ontario, Canada
  • Reporting moderate difficulties with cannabis as indicated by a score of 8 or more on the Cannabis Use Disorders Identification Test - Revised (CUDIT-R; Adamson et al., 2010)
  • Fluency in English
  • Having weekly Internet access with a device that allows for video connection
  • Self-report at least a 6 out of 10 on a Likert-type scale for motivation to reduce cannabis use (i.e., how important it is to reduce cannabis use)

Exclusion criteria

  • Self-reported engagement in other psychological or pharmacological treatments for cannabis use
  • Elevated suicidality, as defined by scoring greater than minimal risk on a screener
  • Current serious psychiatric disorders or history of psychosis, schizophrenia, bipolar disorder
  • Are a woman who is currently pregnant or breastfeeding

Treatment and study plan

Online CBT with MET treatment

Behavioral

The CBT with MET treatment condition will begin with an MET-therapist guided introduction to the program and first module. After this guided introduction, they will have access to the remaining 7 treatment modules and have 6 weeks to complete them. The content of all modules is derived from Cognitive Behavioural Therapy and Motivational Interviewing. Through module engagement, participants will identify goals related to cannabis use, learn strategies to cope with cravings, triggers, and social pressures, and learn to how prevent relapse. Participants will work through modules sequentially.

CBT without MET treatment

Behavioral

The CBT without MET treatment condition will begin with a brief non-MET trained research assistant welcome to the program, and will not include working through the first module together. After this welcome, they will have access to the 8 treatment modules and have 6 weeks to complete them. The content of all modules is derived from Cognitive Behavioural Therapy and Motivational Interviewing. Through module engagement, participants will identify goals related to cannabis use, learn strategies to cope with cravings, triggers, and social pressures, and learn to how prevent relapse. Participants will work through modules sequentially.

Primary outcomes

  1. Change in Cannabis Use

    Time frame: Participants will be assessed using the DFAQ-CU at three time points (i.e., prior to treatment; T0); immediately following the 6-week treatment (T1), and at follow-up (i.e., 10 weeks from baseline, 4 weeks from end of treatment, T2).

    The Daily Sessions, Frequency, Age of Onset, and Quantity of Cannabis Use Inventory (DFAQ-CU; Cuttler & Spradlin, 2017) is a self-report inventory of cannabis use that will be used as the primary assessment of cannabis use. The frequency (i.e., number of days per week) and quantity (i.e., grams) of cannabis use subscales will be used. There is mixed evidence as to whether frequency or quantity better predicts cannabis-related severity, thus information on both will be analyzed.

Secondary outcomes

  1. Cannabis-Related Problems

    Time frame: Participants will be assessed using the CUDIT-R at three time points (i.e., prior to treatment; T0); immediately following the 6-week treatment (T1), and at follow-up (i.e., 10 weeks from baseline, 4 weeks from end of treatment, T2).

    The Cannabis Use Disorders Identification Test-Revised (CUDIT-R; Adamson et al., 2010), is an 8-item self-report questionnaire that will be used to assess problematic cannabis misuse characteristic of Cannabis Use Disorder (CUD).

  2. Anxiety

    Time frame: Participants will be assessed using the GAD-7 at three time points (i.e., prior to treatment; T0); immediately following the 6-week treatment (T1), and at follow-up (i.e., 10 weeks from baseline, 4 weeks from end of treatment, T2).

    The General Anxiety Disorder Scale (GAD-7; Spitzer et al., 2006) is a 7-item self-report anxiety questionnaire that will be used to assess overall anxiety severity.

  3. Depression

    Time frame: Participants will be assessed using the PHQ-9 at three time points (i.e., prior to treatment; T0); immediately following the 6-week treatment (T1), and at follow-up (i.e., 10 weeks from baseline, 4 weeks from end of treatment, T2).

    The Patient Health Questionnaire (PHQ-9; Kroenke et al., 2001) is a 9-item self-report of depression symptoms that will be used to assess overall depression severity.

  4. Quality of Life

    Time frame: Participants will be assessed using the WHOQOL-BREF at three time points (i.e., prior to treatment; T0); immediately following the 6-week treatment (T1), and at follow-up (i.e., 10 weeks from baseline, 4 weeks from end of treatment, T2).

    The World Health Organization Quality of Life Assessment (WHOQOL-BREF; WHOQOL Group, 1998) is a 26-item self-report measure that will be used to assess quality of life.

Sponsors and collaborators

Lead sponsor

York University

Other

Collaborators

  • University of Manitoba

Registry information

Official study title

Testing the Efficacy of an Online Evidence-Based Treatment for Heavy Cannabis Use in Canadian Adults: A Randomized Controlled Trial (RCT)

Important dates

Study start
2022
Primary completion
2023
Study completion
2023
First posted
Jul 16, 2021
Registry last updated
Dec 1, 2023

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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