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 (NYSE: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.

Alison Southwick has no position in any stocks mentioned. David Williamson owns shares of Pfizer. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not 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.