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How does clemastine relieve hay fever symptoms?

Clemastine, an antihistamine, keeps histamines from attaching to cells that would otherwise cause your body to try to flush out allergens (dust, pollen, etc) or infections. The effects of histamine can cause watery eyes, runny nose and sinus pressure. These allergy symptoms are also known as hay fever (allergic rhinitis). Clemastine helps to prevent and reduce hay fever symptoms triggered by allergens such as dust, pollen and pet dander.

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