DEERFIELD, Ill.--Walgreen Co. said last week it will acquire specialty pharmacy and home infusion provider Option Care in a transaction valued at $850 million, the largest in Walgreens' history.

Buffalo Grove, Ill.-based Option Care runs a network of more than 100 pharmacies, 61 of them company-owned, in 34 states. The company has contracts with more than 400 managed care organizations representing 75 million people.

The acquisition "dramatically expands our specialty pharmacy and home infusion footprint and makes us a national player in both areas," said Walgreen CEO Jeffrey Rein in a conference call.

The specialty pharmacy and home infusion markets are estimated at $60 billion a year, with a projected annual growth rate of 20 percent. "This acquisition puts us in a sweet spot for that growth," Rein said, noting that the two markets are getting tied closer together as more biopharmaceuticals are delivered through infusible drugs.

According to Walgreen President Greg Wasson, growth in both markets is being driven by "cost-containment pressures, a strong pipeline of new therapies and an emphasis on care management and compliance monitoring to improve outcomes." He added that with more than 3,000 providers across the country, the infusion market is fragmented. But the new acquisition will give Walgreens a 6 percent share and the No. 2 position in the industry, behind market leader Coram, which has an 11 percent share.

Wasson said the deal is another step in positioning Walgreens to provide a variety of patient-focused health services with a series of recent acquisitions, including:

--Take Care Health Systems, which operates convenient care clinics;
--Medmark Specialty Pharmacy Solutions, a specialty pharmacy company;
--SeniorMed Pharmacy, which provides prescription services to residents in assisted-living, specialty care and independent communities; and
--Schraft's A Specialty Pharmacy, which provides fertility medications and services.

Walgreens' Health Services division includes Walgreens Health Initiatives, a pharmacy benefits manager, Walgreens Mail Service, Walgreens Home Care and Walgreens Specialty Pharmacy. Walgreens Home Care currently operates 45 facilities--including 20 home infusion pharmacies--in 18 states, and Walgreens Specialty Pharmacy operates six locations, including Medmark and Schraft's.

"We're moving beyond traditional pharmacy in ways that are beneficial to our patients and will help payers better manage their overall medical and pharmacy spend," Wasson said.

Walgreen Co. had 2006 sales of $47.4 billion. As of May 31, the company operated 5,751 stores in 48 states and Puerto Rico.