Merck&Co Stock fell by 3.07% to trade at $80.49 by 11:10 (15:10 GMT) on Tuesday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 3.17M. Merck&Co has traded in a range of $80.49 to $82.25 on the day.
The stock has traded at $84.1200 at its highest and $79.8500 at its lowest during the past seven days.
