Fexofenadine is a second-generation antihistamine used primarily to relieve allergy symptoms such as sneezing, runny or itchy nose, and itchy or watery eyes caused by hay fever or other upper respiratory allergies. It works by blocking histamine, a substance that contributes to allergic reactions. Fexofenadine is also effective in treating symptoms of chronic urticaria (hives), including itching and rash. As a second-generation antihistamine, it is less likely to cause drowsiness compared to older antihistamines. The medication typically provides 24-hour relief and is usually taken once a day. It is important to follow the prescribed dosage to minimize potential side effects.