The following video is part of our "Motley Fool Conversations" series, in which David Williamson, health-care editor and analyst, and Brendan Byrnes, industrials editor and analyst, discuss topics around the investing world.

In today's edition, David and Brendan discuss some of the worst health-care stocks of 2011. These stocks fit relatively neatly into three categories: failure to launch, trial troubles, and home health-care scare. This video focuses on failure to launch -- i.e., companies whose drug candidates made it through the rigorous approval process only to be met with a lukewarm (or downright cold) commercial reception. They also discuss which of the downtrodden stocks are likely to get sales rolling in 2012.

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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.