Men who suffer from erectile dysfunction produce the enzyme PDE5 in their body that blocks the production of nitric oxide, which is essential for healthy erections. Each Vilitra 20 tablet contains the active substance Vardenafil, which is a PDE5 inhibitor. Vilitra PDE5 inhibitor boosted oral tablet blocks the action of the PDE5 enzyme and aids in the production of cGMP and nitric oxide in the body.