In this video, health-care analyst David Williamson discusses the sector's three biggest losers today, including VIVUS after posting poor third-quarter results. Watch and find out what investors should take away from these disappointing results and catch up on the day's other big movers.

Brenton Flynn has no positions in the stocks mentioned above. David Williamson and The Motley Fool own shares of Dendreon. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.