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Invention of Viagra has been a blessing for men experiencing problem in having and maintaining erection. The best treatment for erectile dysfunction prior to Viagra was herbal and old fashioned medicine. Viagra revolutionized over night the field of erectile dysfunction much like penicillin revolutionized the entire field of medicine a long time ago and to this day is considered the best and most popular type of treatment for erectile dysfunction. This problem is commonly known as impotency or ED. The problem in having and maintaining erection is mainly due to blood vessels and nerves who are not working properly. Subsequently, VIAGRA augments the blood circulation to the penis, as a result a man when is sexually excited, can have and maintain an erection. This erection goes away as the sexual encounter is finished.