Benylin

Benylin is a brand name owned by Pfizer for a range of cough, cold, and flu medications. The flagship cough syrup is marketed in several countries as Benylin DM, for its active ingredient, dextromethorphan.

The clinical evidence for the efficacy of dextromethorphan (particularly in children) is lacking. The relevant Cochrane report states "There is no good evidence for or against the effectiveness of [ over-the-counter ] medicines in acute cough"