The inability of a male to achieve an erection is known as impotence.One prevalent reason of impotence, sometimes referred to as erectile dysfunction (ED), is an inadequate blood flow to the penis.Sildenafil Citrate, the main ingredient in Vigora 100 mg, increases blood flow to the male sex organ in order to cure erectile dysfunction.Vigora's several strengths are manufactured by Zydus Lifesciences Limited.