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Patients & Consumers Conditions En Español Find an Allergist / Immunologist Just for Kids New Research Parent Resources Pollen Levels Publications Request a Speaker School Tools Seniors The Virtual Allergist™ Treatments Donate Now Search by Condition (A-Z) Search by Topic Allergy & Asthma Issues Educational Brochures Elements of Allergy and Asthma Order Public Education Materials Allergy Shots Drug Guide Sublingual Immunotherapy (SLIT)		Allergic Conditions: Antihistamines Antihistamines are the most widely used medications for allergic diseases. They are used to treat symptoms of allergic rhinitis, or "hay fever," which affects more than 35 million people in the United States. Antihistamines can lessen your symptoms by preventing the effects of histamine—a chemical substance produced by the body during an allergic reaction. Many different antihistamines are available, either by prescription or over-the-counter (OTC). Various forms include eye drops, nose sprays, liquids and pills, either as an antihistamine alone or mixed with other medications, especially decongestants, to relieve a larger range of symptoms. Resources about antihistamines: Allergy and Asthma Drug Guide Tips to Remember: Allergy & Asthma Medications Visit an allergist/immunologist to learn more about allergic disease and your own medical condition. To find an allergist/immunologist near you, use the AAAAI's online Physician Referral Directory.
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