Deslor 5mg contains Desloratadine, a long-acting antihistamine used to relieve allergic symptoms such as sneezing, runny nose, nasal congestion, itchy or watery eyes, and chronic hives (urticaria). It works by blocking histamine, a substance produced by the body during allergic reactions. Unlike first-generation antihistamines, Desloratadine is non-sedating, meaning it does not usually cause drowsiness.