"Prescribing injectable opiates is one of many options in a range of treatments for opiate-dependent drug users. In showing that it attracts and retains long term resistant opiate-dependent drug users in treatment and that it is associated with significant and sustained reductions in drug use and improvements in health and social status, our findings endorse the view that it is a feasible option."
Source
Metrebian, Nicky, Shanahan, William, Wells, Brian, and Stimson, Gerry, "Feasibility of prescribing injectable heroin and methadone to opiate-dependent drug users; associated health gains and harm reductions," The Medical Journal of Australia (Sydney, Australia: June 1998) Volume 168, Issue 12, pp. 596-600.