Vilitra 40 is a pharmaceutical drug primarily used to treat Impaired sexual function. Its active ingredient, vardenafil, belongs to a class of medications known as PDE5 inhibitors. These drugs work by blocking the action of the enzyme PDE5, which typically breaks down cGMP, a molecule that helps relax blood vessels in the penis. By preventing the breakdown of cGMP, vardenafil increases blood flow, allowing men with ED to achieve an erection in response to sexual stimulation.