Cetirizine dihydrochloride is widely used as an antihistamine to treat various allergic conditions. It is effective in relieving symptoms such as sneezing, runny nose, itching, and watery eyes caused by seasonal or perennial allergies. Additionally, it is used to manage chronic urticaria (hives) and other skin-related allergic reactions. The medication works by blocking histamine receptors, reducing the body's allergic response. It is available in oral forms like tablets, syrups, and chewable tablets, making it convenient for both adults and children. Due to its non-sedating properties at recommended doses, it is suitable for daily use without significant drowsiness. It is often preferred for long-term allergy management due to its efficacy and safety profile.