Vilitra 20 tablets contain vardenafil as an active ingredient which works by dilating the blood vessels. It directs blood flow to the penis in order to support a harder penile erection. To make it last longer, Vilitra 20mg relaxes stress around the smooth muscles of the pelvic organs and increases cGMP cycle production. Therefore, it is possible to achieve and maintain the desired stiffness for 4-5 hours.