Benzodiazepine misuse and dependence among opiate addicts in treatment

Abstract Objective: Benzodiazepine misuse among opiate addicts is well described but few studies have reported on the occurrence and management of benzodiazepine dependence within this group. This study reports on the nature and extent of benzodiazepine dependence among a group of opiate addicts and describes the patients' treatment progress and requirement for substitute medication. Method: Over a 12 month period routinely collected data on all admissions of opiate addicts to our inpatient treatment and research unit were searched. Specific details were then extracted for those 61 admissions who were opiate dependent and also currently misusing benzodiazepines. Results: 26 (43%) of the 61 admissions were found to bephysically dependent on benzodiazepines. Temazepam and diazepam (respectively) were the most commonly misused preparations and 22% of those using temazepam were injecting it. Patients requiring detoxification were stabilised on doses of diazepam ranging from 20mg to 80mg daily (mean; 40mg). No correlation was found between reported use of benzodiazepines and the dose of diazepam required for stabilisation. Users found to be physically dependent on benzodiazepines more commonly reported daily use and use of two or more benzodiazepines concurrently. Conclusions: Our findings suggest: 1) that benzodiazepine dependence occurs in opiate addicts with a frequency similar to that reported previously for other groups of benzodiazepine users; 2) that individuals using benzodiazepines on a daily basis may be more at risk of developing physical dependence; and 3) that clinically it is difficult to accurately predict requirements for substitute medication solely from patient's reported daily use prior to admission.