CollaGenex Pharmaceuticals to Sell $45.5 Million of Registered Common Stock.

NEWTOWN, Pa. -- CollaGenex Pharmaceuticals, Inc. (NASDAQ:CGPI) today announced that it has entered into definitive agreements with institutional and other investors to sell 3.5 million shares of common stock for an aggregate purchase price of $45.5 million. The sale price of $13.00 per share represents a 2% discount to yesterday's closing price of $13.31. The transaction is expected to close on November 21, 2006. The shares are being sold under a previously filed shelf registration statement, which the Securities and Exchange Commission has declared effective.

CollaGenex expects that the net proceeds of the offering will be approximately $42.6 million after deducting the placement agency and financial advisory fees and all estimated offering expenses that are payable by CollaGenex. CollaGenex currently intends to use these funds for research and development expenses, manufacturing expenses, clinical trial costs, general and administrative expenses, potential acquisitions of companies, products and technologies that complement its business, and for working capital and other general corporate purposes.

Lazard Capital Markets LLC is acting as sole placement agent in connection with the offering. Leerink Swann & Company acted as financial advisor to the Company in connection with the offering. Copies of the final prospectus may be obtained from CollaGenex Pharmaceuticals, Inc., 41 University Drive, Newtown, PA 18940, Attn: Chief Financial Officer.

This press release does not constitute an offer to sell or the solicitation of an offer to buy any securities of the Company, nor will there be any sale of these securities in any state or 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 jurisdiction.

CollaGenex Pharmaceuticals, Inc. is a specialty pharmaceutical company currently focused on developing and marketing innovative proprietary medical therapies to the dermatology market. In July 2006, CollaGenex launched Oracea(TM), the first FDA-approved systemic product for the treatment of rosacea, and is conducting a 300-patient, Phase II dose-finding study to evaluate its second dermatology candidate, incyclinide, for the treatment of acne. CollaGenex is also conducting Phase I clinical trials to evaluate COL-118, a topical compound based on the SansRosa(TM) technology, for the treatment of redness associated with rosacea and other skin disorders. CollaGenex's professional dermatology sales force also markets Pandel(R), a prescription topical corticosteroid licensed from Altana, Inc., Alcortin(TM) (1% iodoquinol and 2% hydrocortisone), a prescription topical antifungal steroid combination, and Novacort(TM) (2% hydrocortisone acetate and 1% pramoxine HCl), a prescription topical steroid and anesthetic. Alcortin and Novacort are marketed by the Company under a Promotion and Cooperation agreement with Primus Pharmaceuticals, Inc.

CollaGenex also currently sells Periostat(R), which the Company developed as the first pharmaceutical to treat periodontal disease by inhibiting the enzymes that destroy periodontal support tissues and by enhancing bone protein synthesis, and Atridox(R), Atrisorb FreeFlow(R) and Atrisorb-D FreeFlow(R), which are products of QLT USA, Inc., the successor to Atrix Laboratories, Inc., for the treatment of adult periodontitis.

Research has shown that certain tetracyclines can be chemically modified to remove their antibiotic effects while retaining the properties that may make them effective in treating diseases involving inflammation and/or destruction of the body's connective tissues. CollaGenex is evaluating various chemically modified tetracyclines (so called "IMPACS(TM)" compounds because they are Inhibitors of Multiple Proteases And CytokineS) to assess whether they are safe and effective in these applications. The Company has a pipeline of innovative product candidates with possible applications in dermatology and other disease states. In addition, CollaGenex has acquired the Restoraderm(R) technology, a unique, proprietary dermal drug delivery system, and plans to develop a range of topical dermatological products with enhanced pharmacologic and cosmetic properties.

To receive additional information on the Company, please visit our Web site at www.collagenex.com, which does not form part of this press release.

Forward Looking Statements

Statements in this press release regarding management's future expectations, beliefs, intentions, goals, strategies, plans or prospects, including statements relating to the Company's financing efforts, use of proceeds, development efforts, research and development plans, clinical trials and development programs, may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. CollaGenex's actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors, including those factors contained in the most recent Form 10-Q for the quarter ended September 30, 2006 under the section "Risk Factors" as well as other documents that may be filed by CollaGenex from time to time with the Securities and Exchange Commission. Forward-looking statements include statements regarding CollaGenex' expectations, beliefs, intentions, goals, strategies, plans or prospects regarding the future and can be identified by forward-looking words such as "anticipate", "believe", "could", "estimate", "expect", "intend", "may", "should", "will", and "would" or similar words. CollaGenex assumes no obligations to update the information included in this press release or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Periostat(R) and Restoraderm(R) are registered trademarks and IMPACS(TM), SansRosa(TM) and Oracea(TM) are trademarks of CollaGenex Pharmaceuticals, Inc.

Novacort(TM) and Alcortin(TM) are trademarks of Primus Pharmaceuticals, Inc.

Pandel(R) is a registered trademark of Taisho Pharmaceuticals.

Atridox(R), Atrisorb FreeFlow(R) and Atrisorb-D(R) are registered trademarks of QLT USA, Inc.

All other trade names, trademarks or service marks are the property of their respective owners and are not the property of CollaGenex Pharmaceuticals, Inc. or any of our subsidiaries.