Methorphan

Methorphan comes in two isomeric forms, each with differing pharmacology and effects:

Racemethorphan refers to the racemic mixture of both of these stereoisomers. It is listed under the Single Convention on Narcotic Drugs 1961 and is therefore listed in the United States as a Controlled Substance, specifically as a Narcotic in Schedule II with an ACSCN of 9732 and an annual aggregate manufacturing quota of 3 grammes in 2014. The salts in use are the hydrobromide (free base conversion ratio 0.770) and the tartrate (0.644)