Mechanism of Action Allegra Tab, Fexofenadine is a second-generation antihistamine used primarily to treat allergy symptoms. It works by blocking histamine receptors (H1 receptors) in the body. Histamine is a substance produced during allergic reactions that cause symptoms like itching, sneezing, runny nose, and watery eyes. By inhibiting the action of histamine, fexofenadine helps alleviate the..
