This Report for the year 1994 is the fourth and last in the series of Reports on the Drug Treatment Reporting System in the Greater Dublin area published by the Health Research Board. This Report is concerned with persons resident in the Greater Dublin Area who received treatment during 1994 at any one of the 15 centres participating in the reporting system. Between them they cover a range of services and facilities including both medical and non-medical care. Some of these centres are statutory bodies and some are voluntary.