While some may prefer to pay the high price for the familiar brand name, there is no practical or medical reason to do so. This is thanks to Viagra being the first solution widely available for assisting men with ED — not to mention its clever marketing over the years. Sildenafil and Viagra do the same job: they both contain the active ingredient sildenafil citrate. However, these side-effects tend to be mild and temporary, so they might not be a reason to avoid trying ED medication. Plainly speaking, Sildenafil and Viagra contain the same active ingredient. The main difference between them is simply the price and branding; Viagra being more expensive.To find out how the cost of generic sildenafil compares with the cost of Viagra, talk with your doctor, pharmacist, or insurance provider. Why are costs different for brand-name . Compare Sildenafil vs Viagra head-to-head with other drugs for uses, ratings, cost, side effects and interactions. Viagra. Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $