METHADONE

methadone, methadone hydrochloride, methadon, dolophine hydrochloride, fixer, synthetic heroin

(noun) synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction

Source: WordNet® 3.1

Noun

methadone (countable and uncountable, plural methadones)

(chemistry) A synthetic opioid analgesic, used to wean addicts off heroin or other opiate based narcotics, and in chronic pain management.

Source: Wiktionary