Investing.com - Merck&Co fell by 4.38% to trade at $79.84 by 10:08 (14:08 GMT) on Tuesday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 4.06M. Merck&Co has traded in a range of $78.85 to $82.19 on the day.
The stock has traded at $87.2200 at its highest and $78.8500 at its lowest during the past seven days.