Bilast Tablet is used to relieve symptoms of allergic rhinoconjunctivitis (seasonal and perennial) and urticaria (red, raised, itchy bumps) in children. It is used to relieve symptoms such as sneezing, runny, itchy, blocked-up nose and watery and red eyes. Seasonal allergic rhinitis, commonly called hay fever, mostly occurs in the summer, spring or early fall. Perennial allergic rhinitis affects you throughout the year and can be triggered by mould, cockroach or dust mite droppings, pet dander and saliva.