Exhibit 99.1


For Immediate Release:                      Company Contact:
- ---------------------                       ---------------
April 8, 2004                               Nancy C. Broadbent
                                            Chief Financial Officer
                                            (215) 579-7388

                                            Investor Relations:
                                            ------------------
                                            Lisa M. Wilson
                                            In-Site Communications
                                            (212) 759-3929


            CollaGenex Pharmaceuticals Settles Mutual Pharmaceuticals
            ---------------------------------------------------------
                            Patent Infringement Case
                            ------------------------

              CollaGenex and Mutual enter into License and Supply
                   Agreement for branded version of Periostat


Newtown, Pa., April 8, 2004 - CollaGenex  Pharmaceuticals,  Inc. (Nasdaq:  CGPI)
today announced that it has settled all pending  litigation  between  CollaGenex
and United  Research  Laboratories,  Inc./Mutual  Pharmaceutical  Company,  Inc.
("Mutual").

     In connection  with the  settlement,  CollaGenex  and Mutual entered into a
License and Supply Agreement pursuant to which Mutual received a license to sell
a branded version of Periostat(R).  Under this agreement, CollaGenex will be the
sole  supplier  of this  product to Mutual,  subject to certain  conditions,  at
prices below CollaGenex's  average  manufacturer's price through May 2007 or the
earlier termination of such supply arrangements due to certain circumstances. In
addition,  CollaGenex  agreed  not to grant any  license  to sell  Periostat  in
generic trade dress to any third party during the supply term.

     The arrangement with Mutual was contingent  upon,  among other things,  the
formal notice from First DataBank, Inc. that Mutual's product has been listed on
First DataBank's customer databases and priced as a branded product. This formal
notice occurred this afternoon  consistent with First DataBank's weekly standard
practice of providing  such formal  notice only on Thursday  afternoons  Eastern
Time. First DataBank is a leading provider of  comprehensive  drug  information,
including drug pricing, to healthcare professionals and pharmacists.




     CollaGenex  sued Mutual in the United States District Court for the Eastern
District of New York,  alleging that Mutual infringed  CollaGenex's  patents for
Periostat for the treatment of adult periodontitis.  CollaGenex's complaint also
alleged  that Mutual  infringed  CollaGenex's  patent  rights by  submitting  an
Abbreviated New Drug Application  ("ANDA") with the Food and Drug Administration
("FDA"), seeking FDA approval to market a generic tablet version of Periostat.

     In a separate  action in the United States  District Court for the District
of Columbia,  CollaGenex sought and, on July 22, 2003, was granted a preliminary
injunction  preventing  the FDA from  approving  generic  versions of Periostat,
including Mutual's version. Mutual intervened in that case.

     In July 2003,  Mutual commenced an action against  CollaGenex in the United
States District Court for the Eastern District of  Pennsylvania.  Mutual alleged
that  CollaGenex  had engaged in an effort to monopolize the market for low-dose
doxycycline products.

     In  the   settlement,   Mutual   agreed  and  confessed  to  judgment  that
CollaGenex's  Periostat  patents  are  valid  and  would  be  infringed  by  the
commercial manufacture,  use, sale, importation or offer for sale of the generic
version of Periostat for which Mutual submitted its ANDA.  Mutual consented to a
judgment  enjoining  Mutual and any party  acting in concert  with  Mutual  from
infringing  CollaGenex's  patents  by making  and  selling a generic  version of
Periostat  until  CollaGenex's   patents  expire  or  are  declared  invalid  or
unenforceable by a court of competent jurisdiction, or until Mutual is granted a
license  under the  patents,  which  will  occur  under the  License  and Supply
Agreement if a third-party, generic version of Periostat is launched and remains
on the market for a certain period of time or CollaGenex materially breaches its
obligations under the agreement. Finally, Mutual agreed to withdraw from the FDA
case in the District of Columbia.

     CollaGenex  agreed  to  pay to  Mutual  the  amount  of  $2,000,000,  which
represents a portion of the  anticipated  fees and expenses that CollaGenex will
save as a result of the  settlement  of the pending  actions with  Mutual.  This
charge will be recorded in the first quarter of 2004. Under CollaGenex's license
agreement with the State



University of New York ("SUNY")  covering  Periostat,  CollaGenex is entitled to
deduct  costs  incurred to defend its  patents,  including  this  payment,  from
current and future  royalties  due SUNY on net sales of  Periostat  and Mutual's
branded version of Periostat.

     "This  settlement  is highly  favorable  to  CollaGenex  and  resolves  the
inherent risk and uncertainty involved with outstanding  litigation," said Colin
Stewart, president and chief executive officer of CollaGenex. "Most importantly,
it enables us to move forward to capitalize on the significant  opportunities to
continue to grow and build  awareness  of the  Periostat  franchise,  as well as
develop the new MR version and other proprietary products in our pipeline."

     "Nevertheless,  we remain  committed  to  vigorously  enforcing  our patent
rights  against  any party  that seeks to  infringe  those  rights,  and we will
continue to pursue any unauthorized use of our intellectual property," concluded
Mr. Stewart.

     Nancy C. Broadbent,  chief financial officer of CollaGenex,  added, "During
the second  quarter of 2004,  we will be shipping to Mutual an initial  stocking
order of product,  including a one-time promotional  allowance,  which we expect
will affect our  quarterly  sales  patterns and  profitability  for a portion of
2004. Thereafter, we anticipate that our reported sales will be primarily driven
by end user demand,  and we expect to generate  gross margins in the range of 86
to 88% of our total net sales of Periostat, including Mutual's branded version."

Conference Call

     CollaGenex will hold a conference  call on Monday,  April 12, 2004, at 8:30
A.M. Eastern Time to discuss the Company's settlement with Mutual. Investors and
other interested parties can access the conference call by dialing  800-273-1254
in the U.S. or 706-679-8592 internationally, or via a live Internet broadcast on
the Company's website at www.collagenex.com.

     For  those  who  cannot  listen  to the live  broadcast,  a replay  will be
available  shortly  after  the call at the  aforementioned  URL for 90  days.  A
dial-in replay of the call will be available until 11:59 p.m. on April 26, 2004




by dialing 800-642-1687 or 706-645-9291 internationally and entering access code
6683886.

     CollaGenex  Pharmaceuticals,  Inc.  is a specialty  pharmaceutical  company
focused on providing  innovative medical therapies to the dental and dermatology
markets.  Currently, the Company's 115-person professional  pharmaceutical sales
force  markets  Periostat,  which is indicated as an adjunct to scaling and root
planing for the  treatment  of adult  periodontitis.  Periostat is the first and
only  pharmaceutical to treat periodontal disease by inhibiting the enzymes that
destroy  periodontal  support tissues,  and by enhancing bone protein synthesis.
The sales force also promotes Atridox(R), Atrisorb FreeFlow(R) and Atrisorb-D(R)
FreeFlow,  Atrix  Laboratories  Inc.'s  products  for  the  treatment  of  adult
periodontitis,  to the dental  market,  and Pandel(R),  a  prescription  topical
corticosteriod licensed from Altana, Inc., to the dermatology market.

     Research  has shown that certain  unique  properties  of the  tetracyclines
discovered  during the  development  of  Periostat  may be  applicable  to other
diseases  involving  inflammation  and/or  destruction of the body's  connective
tissues,  including acne,  rosacea,  meibomianitis and cancer metastases,  among
others. CollaGenex is further evaluating Periostat, as well as the new IMPACS(R)
compounds,  to assess whether they are safe and effective in these applications.
In addition,  CollaGenex has licensed the Restoraderm(TM)  technology, a unique,
proprietary  dermal drug delivery system, in order to develop a range of topical
dermatological products with enhanced pharmacologic and cosmetic properties.

     To receive additional information on the Company,  please visit our website
at WWW.COLLAGENEX.COM which does not form part of this press release.

     This press release contains  forward-looking  statements within the meaning
of Section 21E of the Securities and Exchange Act of 1934, as amended. Investors
are cautioned that  forward-looking  statements involve risks and uncertainties,
which may affect the Company's business and prospects. The Company's business of
selling, marketing and developing pharmaceutical products is subject to a number
of significant  risks,  including  risks relating to the  implementation  of the
Company's  sales and marketing  plans for Periostat and other  products that the
Company markets,



risks relating to the Company's supply  arrangement with Mutual,  risks that the
FDA will approve  generic  products  that will compete with and limit the market
for Periostat,  risks  inherent in research and  development  activities,  risks
associated  with  conducting  business  in a highly  regulated  environment  and
uncertainty  relating to clinical trials of products under  development,  all as
discussed  in the  Company's  periodic  filings  with  the U.S.  Securities  and
Exchange Commission.


Periostat(R)  and IMPACS(R) are registered  trademarks,  and  RestoradermTM is a
trademark, of CollaGenex Pharmaceuticals, 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.

Pandel(R) is a trademark of Taisho Pharmaceuticals.

Atridox(R),  Atrisorb(R) and Atrisorb-D(R) are trademarks of Atrix Laboratories,
Inc.