Catalyst Health prices public offering of 5,500,000 shares of common stock

Catalyst Health Solutions, Inc. (NASDAQ: CHSI) today announced the successful pricing of its public offering of 5,500,000 shares of common stock, consisting of 4,500,000 shares to be sold by the Company and 1,000,000 shares to be sold by one of its stockholders, Principal Holding Company, LLC, a subsidiary of Principal Financial Group, Inc., at a price of $53.00 per share. The underwriters have a 30-day option to purchase up to an additional 825,000 shares from the selling stockholder. The Company will not receive any proceeds from the sale of shares of its common stock by the selling stockholder. The offering was made pursuant to the Company's registration statement and prospectus filed with the Securities and Exchange Commission (the "SEC"). Goldman, Sachs & Co. and Citi are acting as joint book-running managers for the offering. SunTrust Robinson Humphrey, Inc. and Wells Fargo Securities, LLC are acting as joint lead managers. Subject to customary conditions, the offering is expected to close on or about April 13, 2011.

The Company expects to use the net proceeds received from this offering to fund a portion of the purchase price for the previously announced acquisition of Walgreens Health Initiatives, Inc. ("WHI"). If the acquisition is not completed, the Company will use the proceeds received from this offering for general corporate purposes.

This announcement shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction. Any offer, if at all, will be made only by means of a prospectus, including a prospectus supplement, forming part of the effective shelf registration statement.

The Company has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and the applicable prospectus supplement and other documents the Company has filed or will file with the SEC for more complete information about the Company and the offering. You may get these documents for free by visiting EDGAR on the SEC's Web site at www.sec.gov. Alternatively, copies of the final prospectus supplement and prospectus relating to these securities may be obtained by contacting Goldman, Sachs & Co., Prospectus Department, 200 West Street, New York, New York 10282, telephone: (866) 471-2526; or e-mail at [email protected].