Used primarily in the treatment of allergic conditions such as allergic rhinitis and chronic urticaria. It works by blocking histamine H1 receptors and inhibiting the release of inflammatory mediators like platelet-activating factor. This dual action helps reduce symptoms such as sneezing, nasal congestion, itching, and hives. It is formulated in tablet form for oral administration and offers a non-sedating profile, making it suitable for daily use.