Take a look at some of Tuesday's midday movers:
The S&P 500 touched a new five-year high for the sixth straight session. However, the majority of stocks were lower at midday on both the S&P 500 and the Nasdaq 100 by a roughly 3:1 margin versus gainers.
Merck shares were up on news that the pharmaceutical giant would be allowed to continue its study of the cholesterol drug, Vytorin.
Pfizer was little changed despite an FDA warning that azithromycin (Zithromax or Zmax) can cause abnormal changes in the electrical activity of the heart that could lead to a potentially fatal irregular heart rhythm.