Generic Viagra vs Sildenafilcenforce reviews  work by increasing the level of blood flow to the penis, making it easier to erect.Sildenafil, which is the active ingredient in both drugs, belongs to a class of drugs called phosphodiesterase-5 inhibitors or  inhibitors.As a PDE5 inhibitor, sildenafil works by relaxing muscle tissue within the blood vessel walls, improving blood flow to...