It is not the oxygen that is flammable, it is the substance that burns. The more oxygen, the easier and faster to burn. Views Â· View Upvotes.
Dextromethorphan (DXM or DM) is an antitussive (cough suppressant) drug of the morphinan class with sedative and dissociative properties.
Dextromethorphan (DXM or DM) is an active ingredient in several over-the-counter cough medicines, including generic labels and store brands (TheraFlu, Delsym, Coricidin, Vicks, Dimetapp, Robitussin, Benylin, NyQuil).