Participants in this study are randomly assigned to receive either MAT or supportive treatment for 12 weeks. MAT is given in 15 sessions and consists of motivational interviewing, education, and social skills and behavior modification. Individual MAT sessions are held in Weeks 1 and 12; small group sessions take place in Weeks 2 through 11. Three monthly booster group sessions begin in Week 16. Participants are assessed at baseline and at 3, 6, and 12 months. Medication adherence, psychopathology, quality of life, medication side effects, health beliefs, and functioning are assessed.