Bilastine 20 mg is a non-sedating antihistamine used to relieve symptoms of allergic rhinitis, such as sneezing, runny nose, itchy or watery eyes, and itchy throat, as well as chronic urticaria (hives) with itching and rash. It works by selectively blocking the H1 histamine receptors, preventing the effects of histamine, which is responsible for allergy symptoms. Bilastine is typically well-tolerated and does not cause drowsiness, making it suitable for daytime use without impacting alertness.