Express Scripts: St. Louis-based drug benefit manager buying Medco

Thursday, July 21, 2011 | 1:10 p.m. CDT; updated 7:10 p.m. CDT, Thursday, July 21, 2011

The top two U.S. companies managing prescription-drug benefits are uniting in a $29.1 billion deal they say will help achieve key goals of the health care overhaul: reining in costs and improving patients' health.

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