Valif 20 mg contains the active ingredient vardenafil, which is a medication primarily used to treat erectile dysfunction (ED) in men. Vardenafil belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. When a man is stimulated, nitric oxide is released into the erectile tissue of the, which activates the enzyme guanylate cyclase. This enzyme increases levels of cyclic guanosine monophosphate (cGMP), which relaxes the smooth muscles in the blood vessels of the, allowing for increased blood flow and thus, an erection. https://www.genericday.com/valif-20-mg.html