Although methadone maintenance is an effective treatment for opiate addiction, variations in treatment outcome are evident. These variations may be explained in part by the rehabilitative experiences of patients as reflected in their use of collateral services. This study examined service involvement of 409 methadone maintenance patients at four clinics in order to identify the types of services used and the extent to which potentially rehabilitative services were used. Aside from welfare, there was a strikingly low level of service utilization. Even when services were used, the levels of this use were so low as to be virtually ineffective. These findings regarding treatment and social service utilization suggest that there may not be any attempt to match service provision with patient needs for services. A more rational approach to matching patient needs and available services is thus called for.