United States
Regulations
Substance Abuse and Mental Health Services Administration SAMHSA
Center for Substance Abuse Treatment CSAT
Drug Enforcement Administration (DEA)
National Institute on Drug Abuse NIDA
Office of Drug Control Policy (ONDCP)
National Association of State Alcohol and Drug Abuse Directors NASADAD
Australian Government
Population Health Division
Department of Health and Ageing.
Regulations
Clinical guidelines and procedures for the use of methadone in the maintenance treatment of opioid dependence 2003. (pdf file 336Kb) 
National Drug Strategy Australian Government Department of Health and Ageing.
Clinical guidelines and procedures for the use of methadone in the maintenance treatment of opioid dependence 2003. Abbreviated version. (pdf file 176Kb)
National Drug Strategy Australian Government Department of Health and Ageing.
National Policy on Methadone Treatment 1998. (pdf file 149Kb)
National Drug Strategy Commonwealth Department of Health and Family Services.
Canada
Collège des Médecins du Québec
Ordre des Pharmaciens
Info-SAM
Regulations
Use of Methadone in the Treatment of Opiate Addiction 2003. (PDF Format)
Collège des Médecins du Québec.
Utilisation de la méthadone dans le traitement de la toxicomanie aux opiacés 2003. (PDF Format)
Collège des Médecins du Québec.
Denmark
National Board of Health
Regulations
Circular of 12.12.95 on prescribing pharmaceuticals that create dependency, Annex 1, section 2.
National Board of Health.
United Kingdom
National Treatment Agency for Substance Misuse (NTA)
Regulations
Quality Standards for Drug Treatment 2003.
National Health Service.
International Resources
AC-Company
Information for: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Great Britain, Greece, Hungary, Ireland, Italy, Luxembourg, Lithuania, The Netherlands, Norway, Poland, Romania, Portugal, Russia, Spain, Slovakia, Slovenia, Sweden and Switzerland.
Methadone Guidelines: Information for Policy Makers.
Euromethwork, 2003.