Atom Feed from Searchles Sun Nov 22 09:36:38 EST 2009 en-us FDA drugs Sat Jan 10 13:15:40 EST 2009 Viagra was a pioneer drug in this field. However, many men shifted to Levitra when this drug was introduced in the market. Levitra comes in low dosage forms and hence there is a lower risk of side effects. As a result men started taking Levitra. Moreover, few men for whom Original Viagra didn’t work took Original Levitra and it worked for them.