Comparison of extended versus brief treatments for marijuana use

J Consult Clin Psychol. 2000 Oct;68(5):898-908.


Adult marijuana users (N = 291) seeking treatment were randomly assigned to an extended 14-session cognitive-behavioral group treatment (relapse prevention support group; RPSG), a brief 2-session individual treatment using motivational interviewing (individualized assessment and intervention; IAI), or a 4-month delayed treatment control (DTC) condition. Results indicated that marijuana use, dependence symptoms, and negative consequences were reduced significantly in relation to pretreatment levels at 1-, 4-, 7-, 13-, and 16-month follow-ups. Participants in the RPSG and IAI treatments showed significantly and substantially greater improvement than DTC participants at the 4-month follow-up. There were no significant differences between RPSG and IAI outcomes at any follow-up. The relative efficacy of brief versus extended interventions for chronic marijuana-using adults is discussed.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Cognitive Behavioral Therapy / methods*
  • Female
  • Follow-Up Studies
  • Humans
  • Male
  • Marijuana Abuse / therapy*
  • Psychotherapy, Brief / methods*
  • Psychotherapy, Group / methods
  • Recurrence
  • Surveys and Questionnaires
  • Treatment Outcome
  • Washington