Eli Lilly (LLY 1.19%) is one of today's biggest players in the erectile dysfunction space. Its drug Cialis garnered more than $1.9 billion in 2012, but how important is this single therapeutic to Lilly's total business? What are the competitive dynamics of the erectile dysfunction market, and how do Pfizer's (PFE 0.55%) Viagra and VIVUS' (VVUS) drug Stendra compare to Cialis? In this video, health care analyst Max Macaluso examines these issues for investors.
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