Merck&Co Stock fell by 3.01% to trade at $85.86 by 14:51 (19:51 GMT) on Friday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 9.30M. Merck&Co has traded in a range of $85.86 to $88.76 on the day.
The stock has traded at $92.0600 at its highest and $85.8600 at its lowest during the past seven days.
