Methorphan comes in two forms
- Dextromethorphan - An over-the-counter cough suppressant
- Levomethorphan - The left hand isomer of the above, a potent acting opioid.
Racemethorphan is a racemic mixture of the stereoisomers of methorphan, namely dextromethorphan, which is the active ingredient in "DM" cough syrups, and the lesser known levomethorphan which is described as a controlled substance in The Merck Index - likely because it has more potential for abuse than its dextro enantiomer .
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