With generic version of drugs like Viagra coming, makers are trying new versions. Pfizer, which makes Viagra, is making a chewable form, "Viagra Jet," for the Mexico market. Cialis is projected to be
the top seller in the class that includes Levitra, which is now offered in dissolvable form in Europe, a version that may be sold in the U.S. as Staxyn. It is marketed in a pocketsize, black box.
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