This DPAG (www.drugpolicy.ie) paper examines the provision of formal i.e. specialist treatment services & drug agencies and generic social care services for problem drug users in Ireland. It will be seen that problem drug users (such as Jim and John), and people affected by the drug use of others, are a significant part of the workload of social care service providers. In many cases there will be a number of health and/or social care workers engaged in meeting the multiple and often inter-related needs of this client group.