Viagra an oral pill to treating ED -
The main ingredient of this oral pill is sildenafil citrate.Viagra works by inhibiting some natural chemicals called PDE-5 or phosphodiesterase type 5
which serves to make the male sex organ turn flaccid.
Thus Viagra belongs to the class of PDE-5 inhibitor drugs. PDE-5 chemicals tend to degrade the enzyme cGMP or cyclic guanomonosine phosphate
which relaxes the penis muscles to give it an erection. Thus by inhibiting the PDE-5 enzymes Viagra stops the degradation of cyclic guano monosine phosphate and thus aids in achieving erection.

It is really an amazing fact that around 8 pills of Viagra are dispensed every second world wide and around to treat their patients of their erectile
dysfunction. The first ever oral pill for treating erectile dysfunction had been a success from day one and gets a amazing popularity. And scientists
who created this drug were honored with the Nobel Prize.