"Both drug-free and substitution treatments for opioid users are available in all EU Member States, Croatia, Turkey and Norway. In most countries, treatment is conducted in outpatient settings, which can include specialised centres, general practitioners’ surgeries and low-threshold facilities. In a few countries, residential treatment plays an important role in the treatment of opioid dependence(100). A small number of countries offer heroin-assisted treatment for a selected group of chronic heroin users."

Source

European Monitoring Centre for Drugs and Drug Addiction, "Annual report 2012: the state of the drugs problem in Europe" (Luxembourg: Publications Office of the European Union, November 2012), Catalog No. TDAC12001ENC, doi:10.2810/64775, p. 75.
http://www.emcdda.europa.eu/p…
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