When Viagra became available in 1998, it completely transformed the treatment procedure for erectile dysfunction, or ED. Before this medication was introduced to the market, therapies for EDmainly involved physical procedures.
When a man is sexually stimulated, the brain sends a signal down the spinal cord and into the nerves of the penis. Consequently, nerve endings cause two chambers of spongy tissue to relax and fill with blood. This gives the penis the rigidity that is needed for sex. Any problem with blood flowcan cause erection difficulties and this is what is known as organic erectile dysfunction (ED).