It was less of windfall for drugmaker Pfizer (nyse: PFE - news - people ). In 2002, sales of Viagra amounted to only $1.4 billion, far less than Pfizer's blockbusters for cholesterol, pain, and epilepsy. That hasn't stopped other drugmakers from trying to get onto the market. Already, Bayer (nyse: BAY - news - people ) and GlaxoSmithKline (nyse: GSK - news - people ) have launched their Levitra, a similar drug being promoted with advertisements featuring Mike Ditka. But the real buzz surrounds Cialis, which lasts nine times longer than Viagra and is being sold by a joint venture between Eli Lilly (nyse: LLY - news - people ) and Icos (nasdaq: ICOS - news - people ). Here, a side by side comparison.

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