nasal decongestant, a drug that provides temporary relief of nasal symptoms in acute and chronic rhinitis and sinusitis. Most are over-the-counter products compounded with a small amount of vasoconstrictor, such as pseudoephedrine or phenylephrine. An antihistamine may enhance the value of a nasal decongestant in allergic rhinitis, and a corticosteroid may reduce inflammation. Prolonged use or dosage greater than recommended on the package may cause rebound vasodilation and severe congestion (rhinitis medicamentosa). Use is contraindicated in patients with heart disease.
