How does viagra help to maintain an erection? part 1

Generic Viagra  ( Japanese : バイアグラ ) is an unbeaten drug to stimulate an erection. It comes in tablets forms. So it is very easy to use and never causes pain while using it unlike other impotence treatment injections.  

When it is taken, it releases what is called sildenafil citrate. This is the compound which helps in supporting a lasting erection in men suffering from erectile dysfunction. The sildenafil citrate flows throughout the body; its main working area is the penis. It controls an enzyme phosphodiesterase 5 in the penis. By doing so, this drug enables to maintain an erection that is produced when the penis is stroked.

This enzyme belongs to 11 types of phosphodiesterase. Viagra target PDE5 alone that help in maintaining an erection. PDE5 takes what is called cGMP and breaks it down so that is unusable. The work of CGMP is to relax the smooth muscle in the arterial walls of the penis. When CGMP relaxes these smooth muscles, blood vessels in the penis flood with blood and start to expand the length and girth of the penis causing an erection).