A national movement of parent self-help groups has recently emerged to combat drug abuse in children and adolescents. This innovative modality addresses a major mental health problem in an area where manpower shortages are anticipated. On the basis of self-report data from 135 parent group members, the drug and behavior problems of their children were evaluated. Improvement was reported in the community at large but more frequently in the children of members. The parent groups differed notably in structure and activities; nonetheless, the underlying psychology of membership, i.e., the shared attitudes and social cohesiveness of the members, facilitated the achieving of common goals.