Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it
easier to cough out through your mouth.
Pseudoephedrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated
blood vessels can cause nasal congestion (stuffy nose).
The combination of guaifenesin and pseudoephedrine is used to treat nasal and sinus congestion,
and to reduce chest congestion caused by the common cold, infections, or allergies.
Guaifenesin and pseudoephedrine may also be used for purposes other than those listed in this
medication guide.