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The most common causes of chronic nasal congestion are allergic rhinitis, from environmental allergens or irritants, and chronic rhinosinusitis. Chronic rhinosinusitis is defined as a sinus infection of greater than 12 weeks' duration that includes 2 or more major sinus symptoms or at least 1 major and 2 minor symptoms. Major symptoms include:
It affects the signals in the brain that trigger cough reflex. 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).he combination of codeine, guaifenesin, and pseudoephedrine is used to treat stuffy nose, cough, sinus congestion, and chest congestion caused by allergies, the common cold, or the flu.