Pfizer (NYSE:PFE) fell by 3% to trade at $43.13 by 11:05 (15:05 GMT) on Thursday on the NYSE exchange.
The volume of Pfizer shares traded since the start of the session was 10.35M. Pfizer has traded in a range of $43.01 to $44.49 on the day.
The stock has traded at $45.81 at its highest and $43.06 at its lowest during the past seven days.
