Self-help groups can complement and extend the effects of professional treatment.

The most well-known programs are Alcoholics Anonymous (AA), Narcotics Anonymous (NA), and Cocaine Anonymous (CA), all of which are based on the 12-step model. This group therapy model draws on the social support offered by peer discussion to help promote and sustain drug-free lifestyles.

Most drug addiction treatment programs encourage patients to participate in group therapy during and after formal treatment. These groups offer an added layer of community-level social support to help people in recovery with abstinence and other healthy lifestyle goals.