Methadone is a synthetic opioid, developed first time in Germany in 1937, used medically as an analgesic, antitussive and a maintenance anti-addictive for use in patients on opioids. Although chemically unlike morphine or heroin, methadone also acts on the opioid receptors and thus produces many of the same effects. Methadone is also used in managing [...]

Abuse of benzodiazepines is particularly high among heroin and cocaine abusers. A large percentage of people entering treatment for narcotic or cocaine addiction also report abusing benzodiazepines.