VIAGRA is a prescription drug that works by increasing blood flow to the penis.
When a man is sexually stimulated, VIAGRA helps the penis fill with enough blood to cause an erection. After sex is over, the erection goes away. It remains effective for about 12 hours.
During arousal, the arteries in the penis relax and widen, allowing more blood flow into the erectile tissues. These arteries then expand and harden. The veins that carry blood away from the penis become compressed, restricting the blood flow out of the penis. More blood begins flowing in and less flows out, making the penis larger, and causing an erection. Blood must be able to reach and remain in the erectile tissues to maintain erection quality.
Viagra is best medicine to cure erectile dysfunction in male or used in the treatment of impotence. Viagra dosages will help to boost the blood circulation toward the reproductive organ and help to maintain the proper amount of erection during the sexual intercourse. Take 30 to 40 minutes before the sexual intercourse. There is no need to take on daily basis.