Sildenafil Citrate is the primary and most prevalent component of the little purple pill viagra. By blocking the PDE5 enzyme, this particular substance causes the relaxing of blood vessels to facilitate smooth blood flow within the male genitals, particularly the penile region.
This particular enzyme is causing the blood flow to the erectile region of the male genitals to lessen. Nitric oxide is produced in greater quantities after cGMP is activated. This results in the inactivation of an enzyme, which in turn causes an improvement in the blood flow to the male genitalia, improving the entire penile erection mechanism.