Levocetirizine HCl 5mg is an antihistamine used to treat symptoms of allergic conditions such as hay fever (allergic rhinitis), seasonal allergies, and hives (urticaria). It works by blocking the action of histamine, a substance in the body that is responsible for allergic reactions. By preventing histamine from binding to its receptors, Levocetirizine reduces symptoms like sneezing, runny or itchy nose, itchy or watery eyes, and skin rashes. It is a second-generation antihistamine, which means it causes less drowsiness compared to first-generation antihistamines, making it more suitable for daytime use. Levocetirizine is typically taken once daily, and it is important to follow the prescribed dosage to avoid potential side effects like dry mouth, headache, or mild drowsiness.