Vardenafil, the active component of Vilitra 40 , is a member of the class of pharmaceuticals known as phosphodiesterase type 5 (PDE5) inhibitors. The main purpose of these drugs is to treat male erectile dysfunction (ED).Vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction, is a component of the medicine Vilitra .