TEMPORAL PATTERNS OF HEROIN AND COCAINE USE AMONG METHADONE PATIENTS

A sample of 1,038 patients newly admitted to 15 methadone clinics in N ew York City were studied for up to three years in treatment or until discharge. Cluster analysis identified distinct patient groups with ve ry different heroin and cocaine usage patterns during treatment. About 80% either started in or transitioned to a low heroin use group and 5 0% either started in or transitioned to a low cocaine use group during treatment. One-third of patients used cocaine extensively during trea tment. Other ''high risk'' groups, such as those not recently employed , younger, or involved with criminal justice, could benefit from speci al interventions very early in treatment.