Medically reviewed by Rochelle Collins, DO The "best" cough medicine is ultimately based on the type of cough you have, as well as evaluation of possible side effects. The three main types of over-the ...

Background: Dextromethorphan (DM), the d-isomer of the codeine analog levorphanol, is an active ingredient present in a variety of cough and cold remedies. Recently, data generated from a study in ...