NCIt definition : The hydrobromide salt form of dextromethorphan, a synthetic, methylated dextrorotary
analogue of levorphanol, a substance related to codeine and a non-opioid derivate
of morphine. Dextromethorphan exhibits antitussive activity and is devoid of analgesic
or addictive property. This agent crosses the blood-brain-barrier and activates sigma
opioid receptors on the cough center in the central nervous system, thereby suppressing
the cough reflex.;