The Financial Trade Commission has granted approval today of the merger between Express Scripts and Medco Health Solutions. The $29.1 billion bid will create the biggest manager of prescription-drug benefits for corporate and government clients. The FTC investigated for eight months and ultimately approved the merger by a three-to-one vote of the commissioners. Bloomberg reported, citing Adam Fein, that the combined Express-Medco company would handle 34 percent of prescriptions in the U.S. On the news Express Scripts shares are soaring, up almost 4.5% to $56.45.