This study is designed to test whether a telephone call-in program is a feasible way to collect mood and drug-related information in individuals enrolled in a methadone maintenance program.

Participants will complete a baseline interview and a follow-up interview at 5-weeks post-baseline. Two-thirds of the participants will be randomized into the telephone call-in group, and will be asked to complete daily, 10-minute, telephone interviews. To complete these interviews, participants will call into a toll-free telephone interview system with a unique and private Study ID number, and answers questions by using the telephone key pad. Questions during both the face-to-face interviews and the telephone interviews will assess mood, sleep, treatment utilization and drug-related experiences. Participants will be compensated for their time.

Comparison(s): Participants randomized into the telephone component of the study as compared to participants in the interview-only component of the study.

Inclusion Criteria:

• Recent enrollment in a methadone maintenance program

Exclusion Criteria:

• Enrollment in a methadone maintenance program within the prior 3 months

Individuals who recently enrolled in methadone maintenance for opioid addiction.