Catalyst Rx New Sales Top $250 Million Annually; Company Completes Strategic Acquisition.

ROCKVILLE, Md. -- Catalyst Rx, the pharmacy benefit management (PBM) subsidiary of Catalyst Health Solutions, Inc. (NASDAQ:CHSI), announced today that it secured new PBM business cumulatively representing more than $250 million in annualized revenues and acquired Total Script, a PBM based out of Broomfield, Colorado.

"Mid-size employers and health plans continue to look for opportunities to improve quality of care while lowering costs, and Catalyst Rx is proving to be the PBM of choice," said David T. Blair, Chief Executive Officer of Catalyst Health Solutions. "Clearly, 2009 is shaping up to be a strong year for new business."

The Company has added dozens of new clients consisting of self-funded employers, unions and health plans, including the Hawaii State Teachers Association Voluntary Employees Beneficiary (HSTA VEBA) Trust, based in Honolulu, Hawaii.

Paul A. Tom, President of Benefit Plan Solutions, Inc. and Senior Consultant to the HSTA VEBA Trust, stated, "I recommended the selection of Catalyst Rx because of their flexibility in program and plan design, transparency, pharmacy network and their commitment to the Hawaii market with an established Center of Excellence in Hawaii. The Trust selected Catalyst Rx as their pharmacy benefit manager." The HSTA VEBA Trust represents 22,000 members.

"Our strong sales, coupled with our outstanding client retention, position the Company for continued growth in 2010," added Blair. Earlier this quarter, the Company announced it had retained its business with the State of Ohio with a new three-year contract covering approximately 126,000 lives. The State of Mississippi also recently extended its contract through December 31, 2010, covering 190,000 members.

Additionally, Catalyst announced it has acquired Total Script effective July 16, 2009. Total Script services small to mid-size employers in the Midwest and manages pharmacy benefits for approximately 50,000 lives.

"Total Script extends our presence in a number of key markets and complements our efforts to work locally with self-funded groups," stated Blair.

"We are thrilled to team up with Catalyst and leverage its innovative drug trend management strategies and resources to maximize value for our clients," added Carl Patrick, President of Total Script. "Through this integration, our clients will have a stronger regional presence, access to dedicated account management and clinical staff, and enhanced access to education initiatives and Web tools. We look forward to combining our strengths to best serve our current and future clients."

The Company will discuss new sales, client retention and the acquisition of Total Script during its upcoming investor call scheduled for August 5, 2009.

About Catalyst Health Solutions, Inc. (www.chsi.com):

Catalyst Health Solutions, Inc. is built on strong, innovative principles in the management of prescription drug benefits and provides an unbiased, client-centered philosophy resulting in industry-leading client retention rates. The Company's subsidiaries include Catalyst Rx, a full-service pharmacy benefit manager serving more than six million lives in the United States; HospiScript Services, LLC, one of the largest providers of pharmacy benefit management services to the hospice industry; and Immediate Pharmaceutical Services, Inc., a fully-integrated prescription mail service facility in Avon Lake, Ohio. The Company's clients include self-insured employers including state and local governments, managed care organizations, unions, hospices, third-party administrators and individuals.

This press release may contain "forward-looking statements" as defined in the Private Securities Litigation Reform Act of 1995. These statements involve a number of risks and uncertainties that might materially affect our results, particularly those risks referred to in our Annual Report on Form 10-K for the year ended December 31, 2008 under "Item 1A. Risk Factors." Readers are urged to carefully review and consider the various disclosures made in our Annual Report on Form 10-K and our other filings with the Securities and Exchange Commission that attempt to advise interested parties of the risks and uncertainties that may affect our business. Catalyst Health Solutions, Inc. does not undertake any obligation to update forward-looking statements, whether as a result of new information, future events, or other developments.