Investors dumped shares of drug distributor McKesson (MCK) - Get Report after the company's earnings disappointed Wall Street. McKesson also cut its outlook, prompting a big selloff in other healthcare companies. TheStreet's Jim Cramer believes investors think the drug distribution group isn't needed, and future drug price increases will be limited. Other companies caught in the downdraft included Cardinal health (CAH) - Get Report , CVS (CVS) - Get Report , AbbVie (ABBV) - Get Report , and AmerisourceBergen (ABC) - Get Report . Jim Cramer says investors "are running like I've never seen." The selling in healthcare came even as the overall market rallied at midday.