Generic Viagra Softgel capsules contains Sildenafil citrate as its active core ingredient which belongs to the class of PDE-5 inhibitors.
On entering the bloodstream after rapid absorption from the Softgel capsule, Sildenafil citrate blocks the actions and function of the enzyme PDE-5 which is a key enzyme that leads to ED by restricting the flow of blood in the penile region. After the enzyme PDe-5 is inhibited, the concentration of nitric oxide and cGMP in the body increases. Together these are the potent vasodilators in the body including the penile regions. These biochemicals widens the blood vessels in the penile region and enhances in inflow of the blood in the penis. More blood fills the penis and this leads to a firm and long-lasting penile erection, thus, enabling men to indulge in the satisfactory sexual intercourse.