What does guaifed treat?

Respiratory med: Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth. Phenylephrine 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 phenylephrine is used to treat stuffy nose , chest and sinus congestion.