Investing.com - Merck&Co fell by 4.94% to trade at $78.14 by 09:30 (13:30 GMT) on Monday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was $17.17K. Merck&Co has traded in a range of $78.14 to $78.14 on the day.
The stock has traded at $83.0700 at its highest and $74.1800 at its lowest during the past seven days.