What is antihistamine fexofenadine hydrochloride?

Fexofenadine hydrochloride is a second-generation antihistamine commonly used to relieve allergy symptoms such as sneezing, runny nose, and itchy or watery eyes. It works by blocking the action of histamine, a substance in the body that causes allergic reactions. Unlike first-generation antihistamines, fexofenadine is less likely to cause drowsiness, making it a preferred choice for daytime use. It is available over the counter and is often used for seasonal allergic rhinitis and chronic urticaria (hives).