This study investigated detoxification completion rates and client feedback at Darwin Detoxification Unit from February to August 1999. Through client exit questionnaires, 140 clients recorded reason for leaving and rated satisfaction with staff, daily routine/activities, medication and facilities. Half of all admissions completed detoxification. Alcohol admissions were more than twice as likely as other drug admissions to complete detoxification (p < 0.05). Satisfaction levels were high for both alcohol and other drug admissions and no significant association was found between satisfaction with the Unit and completion of detoxification. The study highlights the challenges in retaining other drug admissions and the need to identify additional strategies to encourage detoxification completion.