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How is an allergic reaction caused by an allergen ? Name a drug that can reduce the symptoms of allergy.

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(1) Altergy is due to the release of chemicals like histamine and serotonin from the mast cells. Common examples of allergens are mites in dust, pollens, animal dander, etc.

(2) The use of drugs like anti-histamine, adrenaline and steroids quickly reduces the symptoms of allergy.

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