Used primarily as an antihistamine in the treatment of allergic conditions such as hay fever, urticaria, and allergic rhinitis. It helps relieve symptoms like sneezing, itching, watery eyes, and runny nose by blocking histamine receptors in the body. Due to its selective action, it causes minimal drowsiness compared to older antihistamines, making it suitable for daytime use. It is typically administered orally in tablet or liquid form and is known for its rapid onset and prolonged duration of action.