Cetirizine is widely used as an antihistamine to relieve symptoms associated with allergies, such as sneezing, runny nose, itching, and watery eyes. It is effective in treating seasonal allergic rhinitis, perennial allergic rhinitis, and chronic urticaria. Additionally, it is used to manage skin reactions caused by hives or insect bites. Due to its non-sedating properties at recommended doses, it is suitable for daytime use, providing relief without causing significant drowsiness. It is also available in various forms, including tablets, syrups, and chewable tablets, making it accessible for both adults and children.