With a newly minted approval in hand for Qsymia, Vivus is ready to start the battle for top obesity drug with Arena's Belviq. Will Vivus' likely first-to-market status help, or will Belviq have the upper hand because of Qsymia's labeling? Watch and find out what it all means for investors.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.