Sildenafil is the active ingredient of Suhagra 100 which is a phosphodiesterase-5 inhibitor. The main reason is to relax the blood vessels of the penis and increase the blood flow to the penis from there, so it helps to get an erection during sexual intercourse and this drug is more effective if taken on an empty stomach and if you are aware of the reviews of this product. So you can see the Suhagra 100 reviews of our product.