McKesson (MCK) closed at $821.84 in the latest trading session, marking a -2.22% move from the prior day. This change lagged the S&P 500's daily loss of 2.06%. Elsewhere, the Dow lost 1.76%, while the tech-heavy Nasdaq lost 2.39%. Coming into today, shares of the prescription drug distributor had gained 2.7% in the past month. In that same time, the Medical sector lost 0.88%, while the S&P 500 gained 1.63%. Analysts and investors alike will be keeping a close eye on the performance of McKesson in its upcomi ...