Background: Substance abuse among children and adolescents is an important public health issue in Taiwan. Kaoshiung Chang Gung Memorial Hospital and Taiwan Kaoshiung Juvenile and Family Court will cooperate in a counseling program for adolescents with illicit drug abusers in 2013, to perform a mandatory 10-week family-based group psychotherapy.

Aims: This study aims (1) to investigate the effectiveness of the family-based group psychotherapy for adolescents with illicit drug abusers and their parents; (2) to identify whether the counseling program is effective for preventing the adolescents from relapse of substance abuse.

Expected Results: The investigators expect that (1) group psychotherapy may involve comprehensive benefits for adolescents with illicit drug abusers, by improving the changes in adolescents' substance-craving symptoms and behavioral problems, and reducing stress of their parents; (2) this counseling program is effective for preventing the adolescents from relapse of substance abuse; (3) the findings in this study will not only demonstrate empirical evidence of treatment effectiveness for adolescents with illicit drug abuse, but will also provide useful clues for future implementation of policy making.

1. The investigators plan to recruit 200 adolescents (=< 20 years) with illicit drug abusers and their parents (100 of intervention group and 100 of comparison group).
2. The intervention group consists of youths that participate in a program that combines a weekly 10-session out-patient motivational enhancement psychotherapy (MEP) program for youths with an additional weekly 10-session parenting skill training (PST) program for their guardians.
3. The comparison group consists of youths that receive standard supervision by the court. All participants were followed up for a maximum of three years.
4. The assessments for adolescents and their parents will be taken at pre- and post-treatment, using the Adolescents' Behavior-problem Scale, the Craving Beliefs Questionnaire, the Family APGAR, the Parenting Stress Index-Short From (PSI/SF) and the Chinese Health Questionnaire (CHQ).
5. The information of adolescents' relapse of substance abuse will be collected by Kaoshiung Juvenile and Family Court.

Inclusion Criteria:

• The adolescents with illicit drug age between 12 to 20.
• One of their parents can attend the counseling program.

Exclusion Criteria:

• The adolescents or their parents can't attend the program.