They both contain the active ingredient Sildenafil, which is also available as a generic unbranded tablet. Viagra is the most recognizable and well-known ED tablet. Can you buy Viagra over the counter? Boots said men will have to complete a questionnaire first to determine if the product is suitable for them. As we mentioned in the introduction, the major difference between Viagra and Viagra Connect is that Viagra Connect is only available as a 50mg tablet.It only comes in one dose: 50mg. Clinically speaking it’s the same drug. The main difference between Viagra and Viagra Connect is that you don’t need a prescription for Viagra . Description Viagra Connect contains 50mg of the active ingredient sildenafil and is made by Fareva Amboise. You can take Viagra Connect 1 hour before sex to help you maintain . Many online companies claim to sell Viagra without a prescription, but this is illegal. What many of these sites actually sell is counterfeit Viagra.