http://www.Pharmaexpressrx.com/index.asp Viagra is a tablet that consists of an active ingredient called Sildenafil. This Sildenafil is used to cure the male erectile dysfunction, commonly known as the impotency. Thus the main use of this pill is for the treatment of erectile dysfunction. The manufacturer of this pill is Pfizer. Sildenafil is a phosphodiesterase type 5 inhibitor and works by preventing the action of a chemical named phosphodiesterase type 5. An erection is basically obtained through many events that take place in the body, which involve the signals from the nervous system and release of certain chemicals in the tissues of the penis. And one such chemical is the cyclic GMP. en-us Copyright 2008 Pharmaexpressrx.com Mon, 19 May 2008 01:12:38 -0400 http://backend.userland.com/rss http://www.Pharmaexpressrx.com/index.asp This medicine should be taken with caution by elderly persons and persons suffering from decreased kidney and liver function and also cardiovascular disorders. http://www.Pharmaexpressrx.com/viagra-remedy-for-erectile-dysfunction.asp Sildenafil also has several side effects but not necessarily each one consuming it is prone to it. Side effects include headache, flushing, dizziness, visual disturbances such as blurred vision and blue tinge to vision. The list also includes indigestion, eye pain, red eyes, fainting, nosebleeds, rash, low blood pressure and high blood pressure.