Vigora 100 includes Sildenafil Citrate, which blocks the effects of PDE five. This allows blood to circulate. It prevents the destruction of Cyclic Guanosine monophosphate (cGMP) that is chargeable for blood vessel contraction and dilation, as well as PDE five. This will cause blood for a on hand go with the flow to the penis. The pressure that consequences in an erection is extended as more blood flows to the penis.