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How are antihistamines used to treat allergies?

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Antihistamines have been used for years to treat allergy symptoms. They can be taken as pills, liquid, nasal spray, or eye drops. Over-the-counter antihistamine eye drops can relieve red itchy eyes, while nasal sprays can be used to treat the symptoms of seasonal or year-round allergies like nasal congestion, sneezing, and runny nose.

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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How do antihistamines work to treat allergies?

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