Levopropoxyphene
(重定向自Novrad)

![Propoxyphene synthesis[3]](/uploads/202501/30/Propoxyphene_synthesis4531.png)
Levopropoxyphene is an antitussive. It is an optical isomer of dextropropoxyphene. The racemic mixture is called propoxyphene. Only the dextro-isomer (dextropropoxyphene) has an analgesic effect; the levo-isomer appears to exert only an antitussive effect. It was formerly marketed in the U.S. by Eli Lilly under the tradename Novrad (a reversal of Darvon) as an antitussive.