One of the most frequently asked questions about Viagra Connect is how it works. Viagra Connect is a medicine that treats erectile dysfunction or impotence. It contains an active substance called sildenafil. Sildenafil is a PDE5 inhibitor that helps to dilate the blood vessels in your penis area and increase blood flow to the penis, allowing you to achieve and sustain a firm erection. Viagra Connect helps you to achieve an erection only with the right sexual stimulation, i.e. without sexual stimulation there will be no erection with Viagra.