Generally, Cialis is considered to be the first true competitor of Viagra, but it now must battle both erectile dysfunction and Viagra’s pioneer status. Viagra came on the market in 1998 and was successful mostly because it was the first product of its kind. Recently a new flourishing drug was created by ICOS corporation which will eventually beat the enviable record of Viagra. There are still more coming, as another drug called Levitra will soon be on the market.
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