Methorphan comes in two isomeric forms, each with differing pharmacology and effects: Racemethorphan is the racemic mixture of both of these stereoisomers!

[2] 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 grams in 2014.

[3][4] The salts in use are the hydrobromide (free base conversion ratio 0.770) and the tartrate (0.644).

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