Vardenafil is used to treat penis Erectile dysfunction. This drug is a type 5 Phosphodiesterase (PDE5) inhibitor. Oral administration of this drug can effectively improve the quality and duration of erection, and improve the success rate of sexual life of male patients with Erectile dysfunction. The initiation and maintenance of penile erection is related to the relaxation of smooth muscle cells in Cavernous tissue. Cyclic guanosine monophosphate (cGMP) is the medium that causes the relaxation of smooth muscle cells in Cavernous tissue
