Final answer:
A decongestant is a medication that helps relieve nasal congestion by shrinking blood vessels in the nasal passages. It is commonly used to treat symptoms of the common cold, allergies, and sinus infections.
Step-by-step explanation:
A decongestant is a medication that helps relieve nasal congestion by shrinking the blood vessels in the nasal passages. It is commonly used to treat symptoms of the common cold, allergies, and sinus infections. Decongestants can be taken orally in the form of tablets or liquids, or they can be used as nasal sprays or drops.
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