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CANDIS - Targeted Treatment for Cannabis Disorders

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified January 2007 by Technische Universität Dresden.
Recruitment status was:  Active, not recruiting
Information provided by:
Technische Universität Dresden Identifier:
First received: November 14, 2005
Last updated: January 15, 2007
Last verified: January 2007
The purpose of this study is to develop a modular treatment program for cannabis use disorders and the evaluation of the effectiveness in a controlled clinical study.

Condition Intervention Phase
Cannabis Use Disorder
Behavioral: Psychotherapy
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: CANDIS -Targeted Treatment for Cannabis Disorders

Resource links provided by NLM:

Further study details as provided by Technische Universität Dresden:

Primary Outcome Measures:
  • - total quit rates, defined as no evidence of cannabis use during the past 4 weeks as evidenced by self report and a negative urine screen; number of times a cannabis product was used in the past 4 weeks
  • ; decrease in ASI total score; retention rate

Secondary Outcome Measures:
  • - number of slips; relapse; abstinence from all legal drugs; number of times of drug use other than cannabis

Estimated Enrollment: 210
Study Start Date: January 2006
Estimated Study Completion Date: March 2007
Detailed Description:

Background. Cannabis is the most widely used illicit substance in the whole Western world and rates are further rising. Almost 240.000 adult Germans fulfill DSM-IV criteria for cannabis dependence and 140.000 the criteria for cannabis abuse (past 12-month), respectively. Several studies have revealed a considerable degree of unmet needs for intervention and treatment for cannabis disorders, for example in terms of associated physical, mental health, social and legal problems. The epidemiological significance of the problem is contrasted sharply with (1) strongly increasing treatment demand due to cannabis-related problems, (2) the lack of evidence-based interventions (motivational and early treatment) (3) the lack of specific services, and (4) the lack of treatment programs and components with established efficacy. With regard to treatment research there is a marked deficit with only a handful of studies up to date. Only in the US and Australia, some recent effort was undertaken to develop and evaluate cannabis-specific dependence treatment programs in controlled trials with highly selective samples. However, there are currently no ‘state of the art’ benchmark programs neither in Germany nor in other European countries that are suitable for routine use.

Aims. (1) To develop a modular treatment program (ST/TST) for cannabis use disorders based on treatment packages and components that have been shown to be effective in previous US and Australian trials, and to adapt these material to the needs of our target population. (2) To demonstrate that this modular treatment package, implying motivational enhancement, cognitive-behavioral and psychosocial problem solving components is efficacious in comparison to a delayed treatment control (DTC) group. (3) Additionally, we test whether the targeted standardized treatment (TST) component tailored to address more specifically core problem areas results in superior short term (3-months) outcomes in these core domains as compared to the ST-group.

Method. A randomized controlled intervention study is proposed. A total of 210 participants will be randomly assigned to two, respectively three study conditions: 1. ST (n=70) including motivational enhancement, cognitive-behavioral, and psychosocial problem solving treatment components, 2. TST (n=70), including the same components as the ST but partly individually matched to the specific problem profile of the patient, and (c) a delayed treatment control group (DTC, n=70). Core outcome variables are total quit rates, number of cannabis use in the past 4 weeks, decrease in ASI scores and retention rate. The core hypothesis will be tested in the combined ST/TST group (n=140). The ASI serves for the allocation algorithms in the TST group and serves as outcome measure for the 3rd hypothesis.

The proposed study is innovative and will result in a considerable advancement of our knowledge about effective treatments in cannabis disorders and will inform about the value of targeted individualized allocation.


Ages Eligible for Study:   16 Years and older   (Child, Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • age 16 or older
  • lifetime diagnosis of cannabis abuse or cannabis dependence (according to the DSM-IV criteria
  • current (4 wks) regular cannabis use (at least 2 days a week)
  • persistent history of regular cannabis use of at least 3 years
  • informed consent to the study procedures and assessments

Exclusion Criteria:

  • current alcohol or any illicit drug dependence syndrome according to DSM-IV other than due to cannabis
  • lifetime history of any psychotic disorder
  • current severe episode of Major depression
  • current panic-agoraphobic disorder (severe)
  • severe learning disability, brain damage or pervasive developmental disorder
  • currently acute suicidality
  • not fluent in german language
  • acute signs of intoxication at screening or baseline assessment due to opiates or any type of stimulants, causing cognitive impairments
  • currently in treatment for cannabis-related disorders in other services
  • current psychotropic medications with sedatives and antipsychotics
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Please refer to this study by its identifier: NCT00252980

Department for Clinical Psychology and Psychotherapy; Technical University of Dresden
Dresden, Germany
Sponsors and Collaborators
Technische Universität Dresden
Principal Investigator: Eva Hoch, PhD Departement of Clinical Psychology and Psychotherapy, Dresden University of Technology
Study Director: Hans-Ulrich Wittchen, PhD Departement of Clinical Psychology and Psychotherapy, Dresden University of Technology
Study Director: Gerhard Bühringer, PhD Departement of Clinical Psychology and Psychotherapy, Dresden University of Technology
  More Information

Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number): Identifier: NCT00252980     History of Changes
Other Study ID Numbers: 01EB0440
Study First Received: November 14, 2005
Last Updated: January 15, 2007

Keywords provided by Technische Universität Dresden:
Substance Abuse Treatment

Additional relevant MeSH terms:
Marijuana Abuse
Pathologic Processes
Substance-Related Disorders
Chemically-Induced Disorders
Mental Disorders processed this record on April 21, 2017