What is the main metabolite of dextromethorphan in Benylin Dry Coughs Night Syrup?

Benylin Dry Coughs Night Syrup’s information, based on individual ingredients rather than the combination, identifies dextrorphan as dextromethorphan’s main metabolite, which also has antitussive action, although slower metabolism in some individuals means unchanged dextromethorphan predominates in blood and urine.