From the smallest biotech to the biggest pharmaceutical stock The Motley Fool's Market Check-Up covers the health-care sector's biggest headlines, hottest market movers, and Obamacare's ongoing rollout.

In this segment from Tuesday's episode, health-care analyst David Williamson looks into three big pieces of bad news for big pharma companies GlaxoSmithKline (NYSE:GSK), Sanofi (NASDAQ:SNY), and Pfizer (NYSE:PFE). David looks at one embattled drug from each of these three companies, and ranks just how bad the damage really is case by case.

Follow David on Twitter: @MotleyDavid.