When ingested, Tadapox prevents the breakdown of cyclic guanosine monophosphate (cGMP) by inhibiting the activity of PDE5 enzymes. Tadapox causes smooth muscle relaxation, vasodilation, and an increase in blood flow to the penis by inhibiting PDE5, which permits cGMP to build up. This procedure helps you achieve hard, long-lasting erections so you may have fulfilling sex.