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.

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 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.