Isomethadol is an opioid

analgesic An analgesic drug, also called simply an analgesic (American English), analgaesic (British English), pain reliever, or painkiller, is any member of the group of drugs used to achieve relief from pain (that is, analgesia or pain management). It ...

with a number of stereoisomers (viz. alpha and beta forms of dextro, laevo, and racemic isomers for a total of six) produced by the reduction of d,l-

isomethadone Isomethadone (INN, BAN; trade nameLiden; also known as isoamidone) is a synthetic opioid analgesic and antitussive related to methadone that was used formerly as a pharmaceutical drug but is now no longer marketed. Isomethadone was used as bo ...

with

lithium aluminium hydride Lithium aluminium hydride, commonly abbreviated to LAH, is an inorganic compound with the chemical formula Li Al H4. It is a white solid, discovered by Finholt, Bond and Schlesinger in 1947. This compound is used as a reducing agent in organic ...

.'' Merck Index'', 11th edition, 5068 It was first produced in the United States in 1948. The salt used in research is the hydrochloride.

References

Opioids {{analgesic-stub