Antihistamine drugs are used to prevent or relieve the symptoms of allergic reactions, such as a rash. Allergens, such as grass pollen, can trigger the release of the chemical histamine from body cells. This chemical acts on small blood vessels, glands, and other tissues, causing the symptoms of allergy. The drugs work by blocking the action of histamine.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.
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