Introduction Center for Mental Health in Kotor was opened in 2005. year. In the center we apply modern methods in the treatment of substance addiction. Objectives Objectives of this project are to understand the current way of functioning and the possibility of making new decisions. Aims Raise awareness on the harmful effects of heroin, for their own health care and social functioning. Methods Formed by a group which has eleven members. Two females, nine males. Age from 25 to 33 years. The paper applied the new method of treatment decisions. Before and during treatment was carried out satisfaction surveys using Manchester Short Assessment of Quality of Life (MANSA). Results Members of groups that are unrealistic estimate the degree of satisfaction with life have left the program or had the resistance of the group. Other members who have had a more realistic self-assessment, regularly participated in the program. Their results MANSA at the start of treatment, pointed to dissatisfaction with social functioning, economic status and interpersonal relationships. At the end of treatment, MANSA indicating satisfaction personal safety, satisfaction with people with whom they live, physical pleasure and mental health. Three members have found employment. Conclusions Group psychotherapy of dual disorder has effect on the level of social functioning. Members of the group have gained the insight that the concern for physical and mental health and social functioning is personal choice. Because group work and group work principles, the members have become more realistic in creating new life decisions.