12-step programs for reducing illicit drug use: a systematic review.

Illicit drug abuse has serious and far-reaching implications for the abuser, their family members, friends, and society as a whole. Preferred intervention programs are those that effectively reduce illicit drug use and its negative consequences, and are cost-effective as well. Current evidence shows that overall, 12-step programs are just as effective as alternative, psychosocial interventions. The costs of programs are, therefore, an important consideration. However, the strength of the studies is weak and further evidence regarding the effectiveness of 12-step programs is needed