This bulletin presents key findings from the first drug prevalence survey of households in both Ireland and Northern Ireland. The survey sampled a representative number of people aged between 15 and 64 during late 2002 and early 2003. The survey was undertaken by MORI MRC according to standards set by the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA). Revised data (June 2005) relating to drug prevalence on a lifetime, last year (recent), and last month (current) basis for Ireland, Northern Ireland, and the Island of Ireland are presented in this bulletin.