Merck&Co Stock fell by 3.05% to trade at $75.62 by 09:56 (14:56 GMT) on Friday on the NYSE exchange.
The volume of Merck&Co shares traded since the start of the session was 2.51M. Merck&Co has traded in a range of $75.60 to $77.48 on the day.
The stock has traded at $82.8300 at its highest and $75.6200 at its lowest during the past seven days.
