Erection is caused by flow of blood into the penis. This occurs when the blood vessels delivering blood to the penis increase the delivery of blood and the blood vessels carrying blood away from the penis decrease the removal of blood. Generally sexual stimulation leads to production of nitric oxide into the penis. Nitric oxide activates the enzyme which produces cGMP. cGMP is primarily responsible for the erection by affecting the flow of blood.
Impotence is a serious problem in men, and most of the men face this problem at some point of their lives. Generally impotence is caused due to damage of arteries, veins, heart disease, diabetes, smoking, excessive consumption of alcohol. Psychological causes like depression, anxiety, stress can also cause erectile dysfunction.
Medical experts and doctors have been have been trying out various forms of treatment but the most popular and widely accepted treatment has been the oral prescription drug Viagra. Viagra gives relief to men suffering from erectile dysfunction. It not only helps men in getting erection but also help them in maintaining the erection throughout the process of intercourse. Viagra is used for the treatment for erectile dysfunction by blocking PDE - 5 enzymes. Sildenafil is the main ingredient of Viagra; it works by relaxing the penile arteries and improves the flow of blood to the penis. Viagra is the most popular drug in its category. There are number of websites providing information on Viagra online. These sites not only provide Viagra online but also provide free consultation from medical experts. It is recommended to use Viagra under medical supervision. So if you are embarrassed to approach doctor, you can take advantage of these online pharmacies and buy Viagra in the privacy of your home.
