Zenegra has a strong effect on the blood flow in the pelvis, including the penis. Zenegra operates as follows: after 15 minutes after administration of Sildenafil increases the volume of blood that enters the cavernous body of the penis. It causes the resistant natural erection, which occurs as a result of sexual arousal. Duration of effects is up to 6 hours, during this period you are guaranteed a good erection, high sensitivity and full orgasms. After the end of sexual intercourse the member returns to a relaxed state, however, under the new excitement once again you have erection high quality.