Fexofenadine, available in 120 mg and 180 mg doses, is a non-drowsy antihistamine commonly used to relieve allergy symptoms, including sneezing, runny nose, itchy or watery eyes, and itchy throat. The 120 mg dose is typically used to treat symptoms of seasonal allergic rhinitis (hay fever), while the 180 mg dose is often prescribed for chronic idiopathic urticaria (hives) to reduce itching and rash. Fexofenadine works by blocking H1 histamine receptors in the body, helping manage allergy symptoms without causing drowsiness, making it suitable for daytime use.