Viagra Connect is a treatment for men aged 18 years and older with erectile dysfunction. Erectile dysfunction is an inability to achieve or maintain an erection that is firm enough to have sex. Erections depend on many different factors, including proper blood flow to the penis. Reduced blood flow to the penis may cause erectile dysfunction. Erectile dysfunction can affect men differently. Some cannot achieve an erection. Others may achieve an erection, but not firm enough for having sex or they may lose the erection before or during sex. Viagra Connect contains the active substance sildenafil. It works by relaxing the blood vessels in your penis, allowing blood to flow into your penis when you get sexually excited and causing an erection. Viagra Connect will only help you to get an erection if you are sexually excited (stimulated).