Efficacy of Contingency Management in the Treatment of Adolescents With Cannabis Use Disorders

Not Applicable

• Conditions: Marijuana Abuse
• Interventions: Behavioral: Standard Treatment Plus Contingency Management Program; Behavioral: Standard treatment

• Registration Number: NCT00878852
• Lead Sponsor: Hospital Clinic of Barcelona

Brief Summary

Cannabis use among Spanish adolescents has been increasing in the last decade. It has been related to poor school achievement, delinquency, substance use and psychiatric disorders. Furthermore, psychoactive substance use in adolescents presenting psychiatric disorders can result in the development of substance use disorders or the worsening of psychopathology. Thus, there's an urge to develop efficient interventions in the treatment of these disorders. Therapeutic approaches based on cognitive-behavioural therapy and motivational interviewing have demonstrated a limited efficacy in this population. Programs based on contingency management have been reported to be useful both in adult and adolescents, too. But it still remains unclear whether a combination of these therapeutic approaches is feasible and brings a better cost-benefit relation.

The investigators' project aims to evaluate the added benefits of supplementing a standard intervention on cannabis use, based on combined approach that includes motivational and cognitive-behavioural elements, with a contingency management program. Therefore, pre and post-treatment evaluation will be carried forward in a sample of 30 adolescents (aged 12-18) that initiate treatment for cannabis use related disorder at the Child and Adolescent Psychiatry Department of the Hospital Clinic in Barcelona. Participants will be randomly assigned to a standard treatment group or an experimental group in which standard treatment will be supplemented with a contingency management protocol. As a secondary objective, a prospective assessment of neuropsychological performance related to cannabis use or abstinence will be carried forward.

Detailed Description

Not available

Study Timeline

• Study Start: 2009-04
• Study First Submitted: 2009-04-08
• Study First Submitted QC: 2009-04-08
• Study First Posted: 2009-04-09
• Status Verified: 2009-05
• Last Update Submitted: 2009-05-20
• Last Update Posted: 2009-05-21
• Primary Completion: 2010-12

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 30

Inclusion Criteria

• Presence of DSM-IV-TR criteria of cannabis abuse and/or dependence
• Signed informed consent

Exclusion Criteria

• Mental retardation
• Presence of a substance use disorder other than nicotine or cannabis
• Severe or unstable medical
• Presence at the moment of inclusion of severe acute psychopathology (acute psychotic symptoms, severe depressive symptoms, suicidal ideation)

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Experimental	Standard Treatment Plus Contingency Management Program	Participants randomly assigned to this group will received standard treatment (including 12 session therapy program) supplemented with an intervention with a contingency management program, designed to improve adherence and efficacy of the treatment program.
Standard treatment	Standard treatment	Participants will be randomly assigned to a standard treatment group. Patients allocated to this group will receive active treatment in form of a 12-session intervention program. This program includes weekly intervention sessions developed according to the MET/CBT12 treatment protocol (Sampl, Kadden, 2001)

Primary Outcome Measures

Name	Time	Method
Percentage of marijuana active users	12 weeks

Secondary Outcome Measures

Name	Time	Method
Percentage of negative urine-screens	12 weeks
Percentage of completed intervention sessions	12 weeks
Scores in psychopathology and drug scales (T-ASI, SDQ, BDI, Cannabis Problem Questionnaire)	12 weeks

Trial Locations

Locations (1)

Hospital Clinic Barcelona; 🇪🇸 Barcelona, Spain