Guaifenesin and dextromethorphan are the active ingredients in Robitussin DM cough syrup, according to MedicineNet. Each 5 milliliters of the syrup contains 100 milligrams of guaifenesin and 10 milligrams of dextromethor... More »

Robitussin DM's two active ingredients are dextromethorphan, which is a cough suppressant, and guaifenesin, which is an expectorant. Some of Robitussin DM's inactive ingredients are menthol, high fructose corn syrup, pur... More »

The active ingredients of guaiphenesin and dextromethorphan in Robitussin DM are manufactured by Pfizer, according to Pfizer's website. There is no information on the source of inactive ingredients in Robitussin DM. This... More »

www.reference.com Health Medications & Vitamins

Robitussin DM's two active ingredients are dextromethorphan, which is a cough suppressant, and guaifenesin, which is an expectorant. Some of Robitussin DM's inactive ingredients are menthol, high fructose corn syrup, pur... More »

The active ingredients of guaiphenesin and dextromethorphan in Robitussin DM are manufactured by Pfizer, according to Pfizer's website. There is no information on the source of inactive ingredients in Robitussin DM. This... More »

www.reference.com Health Medications & Vitamins

The letters "DM" in cough syrup are an abbreviation of dextromethorphan, which is a cough suppressant that belongs to a group of drugs called antitussives. It works in the brain to reduce the desire to cough. More »

Daily Med from the National Library of Medicine reports that M-END DM cough syrup contains Chlorpheniramine Maleate, an anti-histamine, Dextromethorphan Hydrobromide and Pseudoephedrine Hydrochloride M-END DM cough syrup... More »

www.reference.com Health Medications & Vitamins