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How do decongestants work to treat allergies?

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During an allergic reaction, tissues in your nose may swell in response to contact with the allergen. That swelling produces fluid and mucous. Blood vessels in the eyes can also swell, causing redness. Decongestants work by shrinking swollen nasal tissues and blood vessels, relieving the symptoms of nasal swelling, congestion, mucus secretion, and redness.

From: Allergy Medications WebMD Medical Reference

SOURCE: 

American Academy of Allergy, Asthma and Immunology.

FDA. News release.

Sanofi-aventis U.S. News release. 

UpToDate.com. “Patient information: Allergic rhinitis (seasonal allergies) (Beyond the Basics).”

Reviewed by Arefa Cassoobhoy on May 3, 2017

SOURCE: 

American Academy of Allergy, Asthma and Immunology.

FDA. News release.

Sanofi-aventis U.S. News release. 

UpToDate.com. “Patient information: Allergic rhinitis (seasonal allergies) (Beyond the Basics).”

Reviewed by Arefa Cassoobhoy on May 3, 2017

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What are the side effects of decongestants for allergies?

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THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

    This tool does not provide medical advice. See additional information.

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