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 »

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 »

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 »

Robitussin DM is used to relieve congestion and coughing caused by the common cold, according to WebMD. The active ingredient dextromethorphan acts as a cough suppressant, while guaifenesin acts as an expectorant by loos... More »

www.reference.com Health Medications & Vitamins

Robitussin Cough & Cold medicine contains the active ingredients guaifenesin, dextromethorphan and pseudoephedrine, according to WebMD. This combination treats cold, flu and allergy symptoms, such as cough, congestion an... More »