<unk>  (brand name Levo-Dromoran) is an opioid medication used to treat moderate to severe pain. It is one of two enantiomers of the compound racemorphan. It was first described in Germany in 1946. The drug has been in medical use in the United States since 1953.
Levorphanol
Oxybuprocaine
Oxymorphol
Proxymetacaine
Noribogaine
Butorphanol
Hydromorphone
Bethanechol