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Antihistamines for Severe Allergic Reactions - Topic Overview

Antihistamine pills are included in allergy kits to stop or reduce itching, hives, sneezing and wheezing, and other symptoms caused by an allergic reaction. Examples of antihistamines include diphenhydramine (such as Benadryl) and chlorpheniramine (such as Chlorphen and Chlor-Trimeton). The antihistamine pills are not a substitute for an epinephrine shot.

Many allergic symptoms, such as hives and wheezing, occur when a chemical called histamine is released as part of the allergic reaction to an allergen. Antihistamine medicines block the release of histamine.

Recommended Related to Allergies

Allergies During the Holidays

Pass the tissues and antihistamine please -- 'tis the season for holiday allergies. Like unwanted gifts, sneezing and congestion arrive, making allergy sufferers miserable and putting a damper on holiday fun. Fortunately you don't have to be sidelined from the festivities. Whether it's symptoms to food, pets, mold or mildew, allergies during the holidays can be beat -- with lifestyle changes, medication, and a few simple tips.

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Antihistamines can make people sleepy or make it harder for them to concentrate. These medicines should be used carefully by people who need to drive or operate heavy machinery. Other side effects include dry mouth, nausea and vomiting, restlessness or irritability (especially in children), inability to urinate, and blurred vision.

Don't give antihistamines to your child unless you've checked with the doctor first.

WebMD Medical Reference from Healthwise

Last Updated: January 05, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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