Investing.com - Merck&Co fell by 3.30% to trade at $79.06 by 11:15 (15:15 GMT) on Thursday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was $3.64M. Merck&Co has traded in a range of $79.04 to $81.66 on the day.
The stock has traded at $83.5000 at its highest and $79.0500 at its lowest during the past seven days.