The Research Outcome Study in Ireland evaluating drug treatment effectiveness (ROSIE) is the first national, prospective,longitudinal, multi-site drug treatment outcome study in the country. The National Advisory Committee on Drugs (NACD)commissioned this study in 2002 as required by the National Drugs Strategy Action 99. The aim of the Study is to recruit and follow opiate users entering treatment over a period of time documenting the changes observed.

The Study recruited 404 opiate users entering treatment. The outcomes at 1-year for drug use, involvement in crime, injecting-related risk behaviour, physical and mental health among others are presented in this paper. statistically significant1 differences are given emphasis in this document. Behaviour changes relate to the 90 days prior to interviews, unless otherwise stated.