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A decongestant (or nasal decongestant) is a type of pharmaceutical drug that is used to relieve nasal congestion in the upper respiratory tract.The active ingredient in most decongestants is either pseudoephedrine or phenylephrine (the latter of which has disputed efficacy).These are alpha-agonists which on topical application as dilute solution (0.05-0.1%) produce local vasoconstriction.he active ingredient in most decongestants is either pseudoephedrine or phenylephrine (the latter of which has disputed efficacy). These are alpha-agonists which on topical application as dilute solution (0.05-0.1%) produce local vasoconstriction.
Decongestants work by narrowing blood vessels in the lining of the nose. This reduces how much blood flows through the area so that swollen tissue inside the nose shrinks and air can pass through more easily. Read the directions on the drug facts label to learn how much medicine to take and how often to take it. If you have any questions about how much medicine to take, call your family doctor or pharmacist. Keep a record (1-page PDF) of the OTC medicines you are using and when you take them.