Understanding Antihistamines: Xyzal and Cetirizine Navigating the world of allergy medications can be a complex task, especially with numerous over-the-counter options available. Two of the most common and effective choices for combating symptoms of allergic rhinitis and urticaria are Xyzal (levocetirizine) and Cetirizine. As a leading provider of non-prescription medicines in the Czech Republic, the