On Tuesday's edition of Market Checkup, Motley Fool health-care analyst David Williamson lookw at the biggest winners and losers in health-care stocks today.

Shares of Pfizer (NYSE:PFE) were up 3% today, an impressive single-day move for a $200 billion company, after it reported strong earnings results. The company beat on earnings-per-share estimates, and delivered 2014 guidance above expectations on the high end, though the midpoint was a little lower than analysts had hoped. Pfizer also now boasts three different drugs each delivering at least $1 billion in quarterly sales: Lyrica, Prevnar, and Enbrel.

In this segment, David looks through the ups and downs of the company's pipeline at the moment and tells investors why this is definitely a stock to keep an eye on in the coming months.