Method: Participants with only problematic drug use according to the Drug Use Disorders Identification Test (DUDIT),(DUDIT >0 for both men and women) or both problematic alcohol use according to the Alcohol Use Disorders Identification Test (AUDIT), (AUDIT >7 for men and AUDIT >5 for women) and drug use were randomized to T1 (n=101) or the control group (n=101). Outcomes on alcohol and/or drug use as well as health-related symptoms were assessed after 3, 6 and 12 months.