Erectile Dysfunction is the inability to gain and/or maintain an erection for full sexual intercourse. There are medications available that tackle this problem, the main one being Kamagra. Exact Pharma sell Kamagra and are based in India and all orders are shipped from India using an Indian Prescription. They have free delivery and free prescription costs as well so all you pay for is the medication.
You can buy Kamagra @ http://www.exact-pharma.com
There are lots of causes, but poor circulation (that comes with age) is a major one, along with high cholesterol, diabetes, fatigue, some medications, and recreational drugs. Nitric oxide is important because it is a vasodilator, allowing blood to flow into the corpora cavernosa. Viagra (and I suppose analogous meds) prevent the No from being broken down too soon.