COLLAGENEX PHARMACEUTICALS INC
S-3, 2000-04-26
PHARMACEUTICAL PREPARATIONS
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     As Filed with the Securities and Exchange Commission on April 26, 2000
                                                        Registration No. 333-
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                 ---------------
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933


                        CollaGenex Pharmaceuticals, Inc.
             ------------------------------------------------------
             (Exact Name of Registrant as Specified in Its Charter)


         Delaware                                              52-1758016
- --------------------------------                       ------------------------
(State or Other Jurisdiction                           (I.R.S. Employer
of Incorporation or Organization)                      Identification Number)


                               41 University Drive
                           Newtown, Pennsylvania 18940
                                 (215) 579-7388
             ------------------------------------------------------
               (Address, Including Zip Code, and Telephone Number,
        Including Area Code, of Registrant's Principal Executive Offices)


                           Brian M. Gallagher, Ph.D.
                      President and Chief Executive Officer
                        CollaGenex Pharmaceuticals, Inc.
                               41 University Drive
                           Newtown, Pennsylvania 18940
                                 (215) 579-7388
             ------------------------------------------------------
            (Name, Address, Including Zip Code, and Telephone Number,
                   Including Area Code, of Agent for Service)

                                 ---------------

                                    Copy to:
                              David J. Sorin, Esq.
                              Tod K. Reichert, Esq.
                   Buchanan Ingersoll Professional Corporation
                              650 College Road East
                           Princeton, New Jersey 08540
                                 (609) 987-6800

                                 ---------------

      Approximate date of commencement of proposed sale to the public: From time
to time after this Registration Statement becomes effective.
      If the only  securities  being  registered  on this form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. |_|
      If any of the securities  being  registered on this form are to be offered
on a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act
of 1933,  other than  securities  offered only in  connection  with  dividend or
interest reinvestment plans, check the following box. |X|
      If this form is filed to register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. |_|
      If this form is a  post-effective  amendment filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. |_|
      If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. |_|


<PAGE>


- --------------------------------------------------------------------------------
                        CALCULATION OF REGISTRATION FEE
================================================================================
                                    Proposed        Proposed
                       Amount        Maximum         Maximum        Amount Of
  Title of Shares      To Be     Aggregate Price    Aggregate     Registration
 To Be Registered    Registered   Per Share(1)   Offering Price        Fee
- --------------------------------------------------------------------------------
Common Stock,
 $.01 par value....    39,188        $9.7187       $380,858.37       $100.55
================================================================================


(1)   Estimated  solely for the  purpose of  calculating  the  registration  fee
      pursuant to Rule 457(c).  Such price is based upon the average of the high
      and low price per share of the  Registrant's  Common  Stock as reported on
      the Nasdaq National Market on April 20, 2000.

      THE REGISTRANT HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT OF 1933 OR UNTIL THE  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

================================================================================


<PAGE>

- --------------------------------------------------------------------------------
| The  information  in this  Prospectus  is not complete  and may be changed.  |
| The Selling  Shareholders  may not sell  their  securities  until  the       |
| Registration Statement filed with the Securities and Exchange Commission is  |
| effective.  This Prospectus is not an offer to sell these  securities and it |
| is not soliciting an offer to buy these securities in any state where the    |
| offer or sale is not permitted.                                              |
- --------------------------------------------------------------------------------

PROSPECTUS (Not Complete)
Dated:  April 26, 2000


                                  39,188 Shares

                        COLLAGENEX PHARMACEUTICALS, INC.

                                  Common Stock

      This  Prospectus  relates to the public  resale,  from time to time, of an
aggregate of 39,188 shares (the  "Shares") of our Common  Stock,  $.01 par value
(the "Common  Stock") by certain  stockholders  identified  below in the section
entitled "The Selling Shareholders." The Shares were acquired in connection with
the  payment  of  Common  Stock  dividends  to  the  holders  of  the  Company's
outstanding  shares of Series D  Cumulative  Convertible  Preferred  Stock  (the
"Preferred Stock") for the period July 1, 1999 through December 31, 1999.

      We will not  receive  any of the  proceeds  from  the sale by the  Selling
Shareholders of the Shares covered by this Prospectus.

      We have not entered into any underwriting  arrangements in connection with
the sale of  Shares.  The  Shares  may be sold from time to time by the  Selling
Shareholders or by permitted  pledgees,  donees,  transferees or other permitted
successors in interest and may be made on the Nasdaq  National  Market at prices
and at terms then  prevailing  or at prices  related to the then current  market
price, or in negotiated transactions.

      Our Common Stock is traded on the Nasdaq  National Market under the symbol
"CGPI." On April 20,  2000,  the closing  sale price of our Common  Stock on the
Nasdaq National Market was $9.7187 per share.

        INVESTING IN THE COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. SEE
                      "RISK FACTORS" BEGINNING ON PAGE 3.

      Neither the  Securities and Exchange  Commission nor any state  securities
commission has approved or disapproved of these securities or determined if this
Prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.

                                 April 26, 2000.


<PAGE>


                          PROSPECTUS TABLE OF CONTENTS

                                                                            Page
                                                                            ----

Special Note Regarding Forward-Looking Information....................       2
CollaGenex Pharmaceuticals, Inc.......................................       2
Risk Factors..........................................................       3
     Uncertainty of Market Acceptance of Periostat....................       3
     Dependence on Principle Product..................................       3
     Historical Losses................................................       4
     Ability to Grow Internally.......................................       4
     Limited Marketing or Sales History; Dependence on Marketing
       Partners.......................................................       4
     Dependence on Patents, License and Proprietary Rights;
       Enforcement of Rights..........................................       4
     Dependence on Suppliers and Manufacturers........................       7
     Uncertainty of Third Party Reimbursement and Health Care Reform..       7
     Competition and Rapid Technological Change.......................       8
     Uncertainty of New Product Development or Commercialization......       8
     Extensive Government Regulation..................................       8
     Dependence on Key Personnel......................................       9
     Product Liability................................................      10
     Future Capital Needs.............................................      10
     Anti-Takeover Effect of Certain Charter and By-Law Provisions
       and Delaware Law...............................................      10
     Control by Management and Existing Stockholders..................      10
     Volatility of Stock Prices.......................................      11
Use of Proceeds.......................................................      11
Selling Shareholders..................................................      11
Plan of Distribution..................................................      14
Legal Matters.........................................................      15
Experts...............................................................      15
Information Incorporated by Reference.................................      15
Where You Can Find More Information...................................      16
Indemnification of Directors and Officers.............................      17


<PAGE>


               SPECIAL NOTE REGARDING FORWARD-LOOKING INFORMATION

      This   Prospectus   and  the   documents   incorporated   herein   contain
forward-looking statements. For this purpose, any statements contained herein or
incorporated   herein  that  are  not  statements  of  historical  fact  may  be
forward-looking  statements.  For example,  the words "may," "will," "continue,"
"believes,"  "expects,"  "anticipates,"  "intends,"  "estimates,"  "should"  and
similar expressions are intended to identify forward-looking  statements.  There
are a number of  important  factors  that could  cause  CollaGenex's  results to
differ materially from those indicated by such forward-looking statements. These
factors include those set forth below in the section entitled "Risk Factors." In
particular,   CollaGenex's   business  of  selling,   marketing  and  developing
pharmaceutical  products is subject to a number of significant risks,  including
risks relating to the  implementation of CollaGenex's  sales and marketing plans
for Periostat(R),  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.
CollaGenex's  success  depends to a large degree upon the market  acceptance  of
Periostat by periodontists,  dental practitioners,  other health care providers,
patients and insurance  companies.  In addition,  there can be no assurance that
CollaGenex's  product  candidates (other than the FDA's approval of Periostat in
the United States) will be approved by any regulatory authority for marketing in
any  jurisdiction  or, if  approved,  that any such  products or  Denavir(R)  or
Vioxx(R) will be successfully  commercialized by CollaGenex. As a result of such
risks and others  expressed from time to time in  CollaGenex's  filings with the
Securities and Exchange Commission (the "SEC"),  CollaGenex's actual results may
differ   materially   from  the   results   discussed   in  or  implied  by  the
forward-looking statements contained herein.

                        COLLAGENEX PHARMACEUTICALS, INC.

      CollaGenex Pharmaceuticals,  Inc. and its subsidiaries (the "Company"), is
a specialty  pharmaceutical  company  focused on  providing  innovative  medical
therapies to the dental market.  The Company's  first product,  Periostat,  is a
prescription  pharmaceutical capsule that was approved by the United States Food
and Drug  Administration  (the "FDA") in September 1998 as an adjunct to scaling
and root  planing,  the most  prevalent  therapy for  periodontitis,  to promote
attachment  level  gain and to  reduce  pocket  depth  in  patients  with  adult
periodontitis.  The  Company is  marketing  Periostat  to the  dental  community
through its own professional dental  pharmaceutical sales force of approximately
135 sales representatives and managers. This sales force also co-promotes Vioxx,
a prescription  non-steroidal  anti-inflammatory  drug developed by Merck & Co.,
Inc., and Denavir,  a prescription cold sore medication  developed by SmithKline
Beecham  Consumer  Healthcare,  L.P.  The  Company is  actively  pursuing  other
prescription products to market to the dental community.

      We are a Delaware  corporation.  We were incorporated and began operations
in 1992 under the name  CollaGenex,  Inc.  and  changed  our name to  CollaGenex
Pharmaceuticals, Inc. in April 1996. Our principal executive offices are located
at 41 University Drive, Newtown, Pennsylvania 18940, and our telephone number is
(215) 579-7388.

      In this Prospectus,  the terms "CollaGenex," "the Company," "we," "us" and
"our" includes CollaGenex Pharmaceuticals, Inc. and its subsidiaries.


<PAGE>


                                  RISK FACTORS

      IN  ADDITION  TO THE OTHER  INFORMATION  IN THIS  PROSPECTUS,  YOU  SHOULD
CAREFULLY  CONSIDER THE FOLLOWING FACTORS IN EVALUATING WHETHER TO INVEST IN THE
SHARES. THE RISKS AND UNCERTAINTIES DESCRIBED BELOW ARE NOT THE ONLY ONES FACING
OUR COMPANY.  ADDITIONAL  RISKS AND  UNCERTAINTIES  NOT PRESENTLY KNOWN TO US OR
THAT WE  CURRENTLY  DEEM  IMMATERIAL  MAY ALSO  IMPAIR OUR  BUSINESS,  FINANCIAL
CONDITION AND RESULTS OF OPERATIONS.

      IF ANY OF THE FOLLOWING  RISKS  ACTUALLY  OCCUR,  OUR BUSINESS,  FINANCIAL
CONDITION OR RESULTS OF OPERATIONS COULD BE MATERIALLY  ADVERSELY  AFFECTED.  IN
SUCH CASE,  THE TRADING PRICE OF OUR COMMON STOCK COULD DECLINE AND YOU MAY LOSE
ALL OR PART OF YOUR INVESTMENT.

      THIS  PROSPECTUS  ALSO CONTAINS  FORWARD-LOOKING  STATEMENTS  THAT INVOLVE
RISKS AND  UNCERTAINTIES.  OUR ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE
ANTICIPATED IN THE  FORWARD-LOOKING  STATEMENTS AS A RESULT OF CERTAIN  FACTORS,
INCLUDING THE RISKS DESCRIBED BELOW AND ELSEWHERE IN THIS PROSPECTUS.

      UNCERTAINTY  OF  MARKET  ACCEPTANCE  OF  PERIOSTAT.   Our  first  product,
Periostat(R),  is a prescription pharmaceutical capsule that was approved by the
FDA in  September  1998 as an  adjunct  to scaling  and root  planing,  the most
prevalent therapy for adult periodontitis,  to promote attachment level gain and
to  reduce   pocket   depth  in  patients   with  adult   periodontitis.   Adult
periodontitis,  a  chronic  disease  characterized  by the  progressive  loss of
attachment between the tooth and the gums due to chronic progressive  connective
tissue  degradation,  may  result in tooth  loss if  untreated.  Our  growth and
success  will  depend in large  part on our  ability  to  demonstrate  to dental
practitioners  the  effectiveness  of Periostat for the treatment of periodontal
disease.  Further, our growth and success will depend on acceptance of Periostat
by periodontists,  dental practitioners,  other health care providers, insurance
companies,  other third party  payors and  patients.  We cannot  assure you that
dental  practitioners,  who have prescribed  Periostat to their  patients,  will
continue to prescribe Periostat in the future or whether a significant number of
additional dental practitioners will prescribe Periostat to their patients. Even
if  Periostat  gains  broad  long-term   acceptance  by  dental   practitioners,
successful  sales and  distribution  of  Periostat  will  depend  heavily on the
availability  of  reimbursement  from insurance  companies and other third party
payors. The rejection of Periostat by practitioners,  patients or insurers would
have a material adverse effect on our business,  financial condition and results
of operations.

      DEPENDENCE  ON PRINCIPAL  PRODUCT.  Our future  revenue and  profitability
depend on our ability to  successfully  market and sell  Periostat.  Although we
plan to market complementary therapeutic products,  whether developed internally
or by others, we expect that most of our revenue for the foreseeable future will
come  from  sales  of  Periostat.  Our  inability  to  gain  market  acceptance,
successfully  commercialize  or  obtain  adequate  reimbursement  coverage  from
insurance  companies  and other third party  payors for  Periostat  would have a
material  adverse  effect on our  business,  financial  condition and results of
operations.


                                     - 3 -
<PAGE>


      HISTORICAL LOSSES. From our founding in 1992 through the commercial launch
of  Periostat  in  November,  1998,  we had no  revenue  from  sales  of our own
products.  From November 1998 through December 31, 1999, aggregate product sales
of Periostat  were $18.3  million.  During the year ended  December 31, 1999, we
experienced  a net loss of  approximately  $14.6  million.  For the  year  ended
December 31, 1998, we had a net loss of approximately $11.6 million. We also had
a net loss of $8.6 million in 1997 and a net loss of $5.9 million in 1996.  From
inception  through  December 31, 1999, we have experienced an aggregate net loss
of  $52.5  million.  Our  losses  have  resulted  primarily  from  the  expenses
associated with our  pharmaceutical  development  program,  clinical trials, the
regulatory  approval  process  associated with Periostat and sales and marketing
activities relating to Periostat.  We cannot guarantee that we will ever achieve
significant revenues from product sales or profitable operations.

      ABILITY TO GROW  INTERNALLY.  From our inception to late 1998, we operated
with a minimal number of employees. Substantially all pharmaceutical development
activities,  including  clinical  trials,  have been  contracted to  independent
contract research and other organizations.  We have grown to 142 employees as of
December 31, 1999,  up from 134  employees and 14 employees at December 31, 1998
and December 31,  1997,  respectively,  due to the  commercial  introduction  of
Periostat. While learning to train and integrate a newly established and growing
sales  force,  we will  also  need to  successfully  cultivate  and  manage  our
relationships  with  our  marketing  partners  and  other  third  party  service
providers.  Expanding  our  business  has  placed a  significant  burden  on the
management  team and  operations.  Our  failure  to  manage  this  growth in our
operations  successfully  could have a material  adverse effect on our business,
financial condition and results of operations.

      LIMITED MARKETING AND SALES HISTORY; DEPENDENCE ON MARKETING PARTNERS. Our
Company  has  a  limited   history  of  marketing,   distributing   and  selling
pharmaceutical products in the dental market. We market and sell our products in
the  United  States  through  a  direct  sales  force  and   internationally  in
collaboration  with  marketing  partners upon receipt of the  requisite  foreign
regulatory approvals. In January 1999, we trained a sales force of approximately
125 sales  representatives  and managers  and began to promote  Periostat to the
dental community.  Further,  we have entered into agreements to market Periostat
in certain  countries  in Europe,  North  Africa and Canada,  and we continue to
evaluate  partnering  arrangements  in countries  outside the United States.  We
cannot be certain  that we will be able to continue to recruit and retain  sales
and marketing personnel or that we will be able to successfully expand our sales
and marketing efforts.  Furthermore, we cannot control the resources our foreign
partners devote to marketing, distribution and sales activities of Periostat nor
can we ensure that these partners will perform their contractual obligations.  A
failure  of our  United  States  sales  force to market  Periostat  or any other
product  successfully  would have a  material  adverse  effect on our  business,
financial condition and results of operations.

      DEPENDENCE ON PATENTS,  LICENSE AND  PROPRIETARY  RIGHTS;  ENFORCEMENT  OF
RIGHTS.  Because of the substantial  length of time and expense  associated with
bringing new products through development to the marketplace, the pharmaceutical
industry places considerable  importance on obtaining and maintaining patent and
trade  secret  protection  for new  technologies,  products and  processes.  Our
success will depend in part on several factors,  including,  without limitation:
our  ability to obtain and  maintain  patent  protection  for our


                                     - 4 -
<PAGE>


technologies, products and processes; our ability to preserve our trade secrets;
and our ability to operate without  infringing the  proprietary  rights of other
parties both in the United States and in foreign countries.

      We  depend  on a  license  from  the  Research  Foundation  of  the  State
University  of New York at Stony Brook  ("SUNY") for all of our core  technology
(the "SUNY License").  The SUNY License grants us an exclusive worldwide license
to SUNY's interests in certain patents and patent  applications to make and sell
products  employing  tetracyclines  that  are  designed  or  used  to  change  a
biological  process.  Twenty four United  States  patents held by SUNY and eight
United States patent applications held by SUNY are licensed to us under the SUNY
License.  The patents  licensed from SUNY expire between 2004 and 2018. Of those
patents  specifically  related to Periostat,  the first expires in 2004, and the
second expires by the year 2007. Of the twenty four patents, one patent has been
co-assigned to the University of Miami, Florida, one patent has been co-assigned
to the Washington University,  St. Louis, and one patent has been co-assigned to
the Hospital for Joint Diseases.  Of the eight patent  applications,  one patent
application has been co-assigned to the Hospital for Joint Diseases,  one patent
application has been co-assigned to the University of Miami, Florida, one patent
application has been co-assigned to the University of Rochester,  and one patent
application is co-owned by the University of Helsinki.

      The primary  United  States patent  claims  methods of using  conventional
tetracyclines to inhibit pathologically  excessive  collagenolytic activity (the
"Primary Patent"),  while a related United States patent claims methods of using
tetracyclines which have no antibiotic activity (the "Secondary  Patent").  SUNY
did not apply in foreign  countries  for  patents  corresponding  to the Primary
Patent but has  obtained  patents that  correspond  to the  Secondary  Patent in
Australia,  Canada and certain European countries.  One of the Secondary Patents
has  issued in  Japan.  SUNY  also has  obtained  patents  in  certain  European
countries, Canada and Japan and has pending patent applications in certain other
foreign  countries  which  correspond to its United States  patents  relating to
methods of use of  tetracyclines  to reduce bone loss. Our rights under the SUNY
License are subject to certain  statutory rights of the United States government
resulting from federal support of research activities at SUNY.

      If we do not  obtain  and  maintain  our  patent  protection  we may  face
increased  competition in the United States and in foreign  countries.  The SUNY
License imposes various payment and reporting  obligations on us. Our failure to
comply with these  requirements could result in the termination of such license.
If the SUNY License is  terminated,  or if we do not obtain and maintain  patent
protection  for our  technologies,  then our business,  financial  condition and
results of operations could be materially adversely affected.

      One of the United States  patents and one  corresponding  Japanese  patent
application  licensed to us under the SUNY License are owned jointly by SUNY and
a Japanese company.  These patent rights, which expire in 2012, cover particular
chemically modified  tetracyclines (the "Jointly Owned CMTs") that were involved
in research  activities  between  SUNY and the  Japanese  company.  The Japanese
company may have exclusive rights to these Jointly Owned CMTs in Asia, Australia
and New  Zealand and may have a  non-exclusive  right to exploit  these  Jointly
Owned CMTs in other  territories.  These  Jointly Owned CMTs are not involved in


                                     - 5 -
<PAGE>


Periostat,  but could in the future prove to be important for one or more of the
other potential applications of our technology. If we do incorporate the Jointly
Owned CMTs in any future product, we may not be able to market these products in
Asia,  Australia and New Zealand and could experience  increased  competition in
other markets, including the United States, from the joint owner.

      Since patent  applications  in the United States are maintained in secrecy
until patents issue, and since  publication of discoveries in the scientific and
patent  literature tend to lag behind actual  discoveries by several months,  we
cannot be  certain  that we were the first  creator  of  inventions  covered  by
pending  patent   applications  or  that  we  were  the  first  to  file  patent
applications for such inventions.

      In  addition,  we  cannot  guarantee,   without  limitation,  that  patent
applications to which we hold rights will result in the issuance of patents; any
patents  issued  or  licensed  to us will be free  from  challenge  and  that if
challenged,  that they would be held to be valid;  any such patents will provide
commercially  significant protection to our technology,  products and processes;
others  will not  independently  develop  substantially  equivalent  proprietary
information  which is not  covered  by  patents to which we own rights or obtain
access to our know-how;  or, others will not be issued  patents that may prevent
the sale of one or more of our products, or require licensing and the payment of
significant  fees or royalties  by us to third  parties in order to enable us to
conduct our business.

      If any  relevant  claims of  third-party  patents  are upheld as valid and
enforceable,  we  could be  prevented  from  selling  our  products  or could be
required to obtain licenses from the owners of such patents. We cannot guarantee
that  such  licenses  would be  available  or,  even if  available,  would be on
acceptable  terms to us. If we fail to obtain these  licenses such failure would
have a material adverse effect on our business,  financial condition and results
of operations.

      Due to the  general  availability  of  generic  tetracyclines  for  use as
antibiotics,  we could  become  involved in  expensive  infringement  actions to
enforce and/or protect our patents.  Regardless of the outcome,  the defense and
prosecution  of patent claims is expensive  and time  consuming and may distract
our management from their other  activities.  Although federal law prohibits the
promotion or marketing  of  pharmaceuticals  for  unauthorized  uses,  we cannot
guarantee  that  practitioners  will not  prescribe or patients  will not obtain
generic forms of  doxycycline  and divide the tablets into smaller doses instead
of obtaining a prescription for Periostat.

      Our success also depends upon know-how,  unpatentable  trade secrets,  and
the skills,  knowledge and experience of our scientific and technical personnel.
We require all employees to enter into confidentiality  agreements that prohibit
the  disclosure  of  confidential  information  to  third  parties  and  require
disclosure  and assignment of rights to their ideas,  developments,  discoveries
and inventions. In addition, we try to get such agreements from our consultants,
advisors  and  research   collaborators.   We  cannot  guarantee  that  adequate
protection will be provided for our trade secrets, know-how or other proprietary
information  if there is any  unauthorized  use or disclosure.  We  occasionally
provide information and chemical compounds to research collaborators in academic
institutions  and  request  the  collaborators  to  conduct  tests  in


                                     - 6 -
<PAGE>


order to investigate  certain  properties of the compounds.  We cannot guarantee
that the academic  institutions will not assert intellectual  property rights in
the results of the tests  conducted by the research  collaborators,  or that the
academic  institutions  will grant  licenses  under such  intellectual  property
rights to us on  acceptable  terms or at all. If the  assertion of  intellectual
property rights by an academic  institution is  substantiated,  and the academic
institution  does not grant  intellectual  property  rights to us, our business,
financial  condition  and results of operations  could be  materially  adversely
affected.

      DEPENDENCE ON SUPPLIERS AND MANUFACTURERS. We rely on a single supplier, a
Portuguese-based  company, for doxycycline,  the active ingredient in Periostat.
There are relatively few alternative  suppliers of doxycycline and this supplier
produces the majority of the  doxycycline  used in the United States.  We cannot
guarantee  that we will be able to procure a commercial  quantity of doxycycline
from our current  supplier  on an ongoing  basis at a  competitive  price or, if
necessary,  that we could find a replacement supplier in a timely manner or with
favorable  pricing terms.  Any  interruption in the supply of doxycycline  would
have a material adverse effect on our business.

      We rely on a single third-party contract manufacturer to produce Periostat
and we are  currently  working with another  contract  manufacturer  on a tablet
formulation for Periostat.  We intend to contract with additional  manufacturers
for the commercial  manufacture of Periostat;  however, we cannot guarantee that
we will be able to consummate additional manufacturing  arrangements or maintain
the terms of our current manufacturing arrangement. An inability to maintain our
arrangements with our present  manufacturer could result in delays in the supply
of  Periostat  that  would  have a  material  adverse  effect  on our  business,
financial condition and results of operations.  In addition,  we believe that it
could  take up to one  year to  successfully  transition  to and  integrate  our
operation with a new manufacturer. Our manufacturer of Periostat and our foreign
supplier of doxycycline are subject to rigorous FDA regulatory  requirements and
the  failure  of either  entity to comply  with such  requirements  would have a
material  adverse  effect on our  business,  financial  condition and results of
operations.

      UNCERTAINTY  OF  THIRD  PARTY   REIMBURSEMENT   AND  HEALTH  CARE  REFORM.
Successful  commercialization of Periostat or other pharmaceutical products that
we may develop or market will depend,  in part,  upon the  availability  in both
domestic and foreign markets of reimbursement or funding from third party health
care payors such as government and private  insurance  plans,  including  dental
managed care plans. As third party payors seek to contain their own costs,  they
may reduce reimbursement levels or decline reimbursement for new products. These
actions  may  restrict  our  ability  to realize  an  appropriate  return on our
pharmaceutical  products. It is also uncertain what legislative proposals may be
adopted  relating to health care  reimbursement  or what actions may be taken in
response to any health care reform proposals or legislation by federal, state or
private  payors of health care  products and services.  In addition,  in certain
foreign markets,  pricing or profitability  of prescription  pharmaceuticals  is
subject to governmental  control.  A reduction in reimbursement  levels by third
party payors or regulations  which  effectively  limit the  reimbursement of our
products  would  have a  material  adverse  effect  on our  business,  financial
condition and results of operations.


                                     - 7 -
<PAGE>


      COMPETITION   AND  RAPID   TECHNOLOGICAL   CHANGE.   Competition   in  the
pharmaceutical industry is intense. Many pharmaceutical companies are engaged in
research  and  development  activities  relating to disorders  characterized  by
connective tissue destruction and may focus such efforts on periodontal disease.
Many of these  competitors  have  substantially  greater  financial,  marketing,
sales,  distribution and technical resources than do we and have more experience
in research and development,  clinical trials, regulatory matters, manufacturing
and  marketing.  Our  technology  may be rendered  obsolete or  uneconomical  by
technological advances or entirely different approaches developed by one or more
of our  competitors.  The  development  of  successfully  competing  products or
commercialization  of new  products  by our  competitors  could  have a material
adverse effect on our business, financial condition and results of operations.

      UNCERTAINTY  OF NEW  PRODUCT  DEVELOPMENT  OR  COMMERCIALIZATION.  We have
several potential products for non-dental applications that are in various early
stages of development  that would require  significant  additional  research and
development,  clinical trials and appropriate  regulatory approval before any of
these products may be  commercialized.  All of these proposed products are based
upon our core  technology,  which is licensed  from SUNY. We plan to develop and
commercialize  these non-dental  products through  collaborations  and licensing
arrangements  with third parties who likely will be responsible for many aspects
of  pre-clinical   testing  and  human  clinical  trials,  the  preparation  and
submission of  applications  for regulatory  approval and the  manufacturing  of
these  products.  We  will,  therefore,  be  dependent  upon the  expertise  and
resources  of third  parties  to  develop,  commercialize  and  manufacture  new
products.  We cannot  guarantee the  successful  development of any new products
based upon our core technology by third parties.

      EXTENSIVE   GOVERNMENT   REGULATION.   We  are  subject  to  comprehensive
regulation  by the FDA in the United  States and by  comparable  authorities  in
other  countries.  These national  agencies and other federal,  state, and local
authorities  regulate,   among  other  things,  the  research  and  development,
including  preclinical and clinical testing,  safety,  effectiveness,  approval,
manufacturing,  labeling,  advertising,  promotion, export, and marketing of our
products.  In the United  States,  the FDA  regulates  drug  products  under the
Federal Food, Drug, and Cosmetic Act, and other laws.

      Drug  products  may not be marketed in the United  States  until they have
received  approval from the FDA. Other than Periostat,  none of our products has
been approved for marketing in the United States.  The steps  required  before a
drug  product may be  approved  for  marketing  in the United  States  generally
include: (i) preclinical laboratory and animal testing; (ii) the approval by the
FDA of an  investigational  new drug  application  ("IND")  for  human  clinical
testing;  (iii) human clinical  trials to establish the efficacy of the drug and
any  additional  human  clinical  trials  needed to establish  safety;  (iv) the
submission to the FDA of a New Drug Application  ("NDA");  (v) FDA review of the
NDA in order to  determine,  among  other  things,  whether the drug is safe and
effective  for its intended  use;  and (vi)  satisfactory  completion  of an FDA
inspection of the  manufacturing  facility or facilities at which the product is
made to assess compliance with Good Manufacturing Practices ("GMP").

      After NDA  approval  is  obtained,  an NDA holder is  subject to  numerous
continuing  requirements.  For example,  quality control and manufacturing  must
conform  to  complex  and


                                     - 8 -
<PAGE>


detailed GMP  requirements.  Also,  an NDA holder is required to report  certain
adverse  reactions  to the  FDA,  and to  comply  with  requirements  concerning
advertising, promotion and labeling of its products.

      Both  before and after  approval is  obtained,  violations  of  regulatory
requirements  or  discovery  of problems  with the product may result in various
adverse  consequences,  including  the FDA's  delay in  approving  or refusal to
approve a product,  recalls,  withdrawal of an approved product from the market,
and/or the  imposition  of civil or criminal  sanctions.  Also,  new  government
requirements  may be  established  that could affect drug products at any point,
both before and after approval.

      The  processes of obtaining  drug  approvals  and  maintaining  continuing
compliance  with the Federal Food,  Drug, and Cosmetic Act and  regulations  are
time consuming and require the expenditure of substantial  resources.  We cannot
assure you that approvals of our compounds under  development will be granted on
a timely  basis,  or at all, or that we will be in  continuing  compliance  with
applicable requirements.  A delay in or a failure to obtain requisite government
approvals, a failure to obtain approvals of the scope requested, or a failure to
maintain  continuing  compliance  with  applicable  requirements  will  delay or
preclude us or our licensees or marketing partners from marketing  products,  or
limit the  commercial use of such  products,  and could have a material  adverse
effect on our business,  financial condition and results of operations.  Failure
of our foreign supplier of the active  ingredient used in the manufacture of our
products or failure of our  manufacturer of its finished dosage form products to
comply with GMP  regulations or other FDA regulatory  requirements  would have a
material  adverse  effect on our  business,  financial  condition and results of
operations.

      The  Drug  Price  Competition  and  Patent  Term  Restoration  Act of 1984
provides for abbreviated approval requirements for generic drugs and exclusivity
protection for certain innovative products that prevents FDA approval of generic
versions for specific time periods, and patent extension for a certain period of
time.  Because  Periostat is being treated by the FDA as an  "antibiotic,"  such
exclusivity protection is not available.  Therefore,  we must rely solely on any
patent  protection  we may have with respect to  Periostat.  Also no patent term
extension  will be available for Periostat in its current form. In addition,  we
will be subject to certain user fees that the FDA is  authorized  to collect for
reviewing NDAs and other marketing applications.

      We also  will be  subject  to a  variety  of  foreign  regulatory  regimes
governing clinical trials and sales of our products.  Our products have not been
approved in any foreign country.  Whether or not FDA approval has been obtained,
approval  of a product  by the  comparable  regulatory  authorities  of  foreign
countries must be obtained prior to the commencement of marketing of the product
in those  countries.  The approval  process varies from country to country,  and
other countries may also impose post-approval requirements.

      DEPENDENCE  ON KEY  PERSONNEL.  We are  highly  dependent  on our  current
management,  scientific  advisors and consultants and our success will depend in
part on their  continued  service and our ability to  identify,  hire and retain
additional  qualified  personnel in an  intensely  competitive  market.  We face
intense  competition in our recruiting  activities and we cannot assure you that
we will be able to attract  and/or retain  qualified  personnel.  The failure to
attract


                                     - 9 -
<PAGE>


and  retain  personnel  could have a material  adverse  effect on our  business,
financial  condition  and results of  operations.  We do not maintain key person
life insurance on any member of management.

      PRODUCT  LIABILITY.  Our business  may be adversely  affected by potential
product liability risks inherent in the testing,  manufacturing and marketing of
Periostat  and other  products  developed by or for us. We have $10.0 million in
product  liability  insurance for  Periostat.  This insurance may not adequately
protect us against product  liability  claims. A failure to maintain  sufficient
coverage or the failure to obtain  indemnification  from third parties for their
respective  liabilities may expose us to product liability claims and/or recalls
that could have a material adverse effect on our business,  financial  condition
and results of operations.

      FUTURE CAPITAL NEEDS. We have historically financed our operations through
public offerings and private equity financings.  Our capital requirements depend
on  numerous  factors,  including  our  ability  to  successfully  commercialize
Periostat, competing technological and market developments, our ability to enter
into  collaborative  arrangements for the development,  regulatory  approval and
commercialization  of  other  products,  and the  cost of  filing,  prosecuting,
defending and enforcing patent claims and other intellectual property rights. We
anticipate that we may be required to raise additional  capital over a period of
several  years  in order to  conduct  our  operations.  Additional  funding,  if
necessary, may not be available on favorable terms, if at all. If adequate funds
are not available, we may be required to curtail operations  significantly or to
obtain funds through arrangements with collaborative partners or others that may
require  us to  relinquish  rights  to  certain  of  our  technologies,  product
candidates, products or potential markets.

      ANTI-TAKEOVER EFFECT OF CERTAIN CHARTER AND BY-LAW PROVISIONS AND DELAWARE
LAW. Anti-takeover  provisions of Delaware law, our Certificate of Incorporation
and our  By-Laws  could  make it more  difficult  for a third  party to  acquire
control of us, even if such change would be beneficial to our stockholders.  Our
Certificate  of  Incorporation  provides  that our board of directors  may issue
preferred stock with superior rights and preferences  without common stockholder
approval.  The  issuance of  preferred  stock could have the effect of delaying,
deterring  or  preventing a change in control.  Our board of directors  has also
adopted a "poison  pill"  rights plan that may further  discourage a third party
from  making a proposal  to acquire  us. In  addition,  in  connection  with the
issuance of our preferred  stock,  the rights of our common  stockholders may be
limited  in  certain  instances  with  respect  to  divided  rights,  rights  on
liquidation, winding up and dissolution and certain other matters submitted to a
vote of our common stockholders.

      CONTROL BY MANAGEMENT AND EXISTING STOCKHOLDERS.  Currently, our executive
officers,   directors  and  affiliated   entities   together   beneficially  own
approximately  42% of the  outstanding  shares  of our  Common  Stock or  equity
securities  convertible  into Common  Stock.  As a result,  these  stockholders,
acting  together,  or in the  case of our  preferred  stockholders,  in  certain
instances,  as a class,  will be able to exercise control over corporate actions
requiring  stockholder  approval,  including the election of  directors.  Such a
concentration  of  ownership  may have the effect of  delaying or  preventing  a
change  in  control,  including  transactions  in which our  stockholders  might
otherwise receive a premium for their shares over then current market prices.


                                     - 10 -
<PAGE>


      VOLATILITY  OF STOCK  PRICES.  The market  price of our  Common  Stock has
fluctuated  and will  continue to  fluctuate  as a result of  variations  in our
quarterly  operating  results.  These  fluctuations  may be  exaggerated  if the
trading  volume of our Common  Stock is low. In  addition,  the stock  market in
general has  experienced  dramatic  price and volume  fluctuations  from time to
time. These  fluctuations may or may not be based upon any business or operating
results. Our Common Stock may experience similar or even more dramatic price and
volume fluctuations which may continue indefinitely.

                                 USE OF PROCEEDS

      The  Company  will not receive  any of the  proceeds  from the sale of the
Shares offered by the Selling Shareholders set forth in this Prospectus.

                              SELLING SHAREHOLDERS

      The individuals listed below (the "Selling  Shareholders") received shares
of  Preferred  Stock  in  connection  with  the  execution  of a Stock  Purchase
Agreement with the Company,  dated March 19, 1999. The Preferred Stock is by its
terms  convertible,  in  certain  circumstances,  into  shares of Common  Stock.
Holders of the Preferred Stock are also entitled to certain dividend payments to
be made in  shares  of Common  Stock.  Under  the  terms of the  Stock  Purchase
Agreement,  all such dividend payments issued to the Selling Shareholders are to
be registered with the Securities and Exchange  Commission.  The registration of
shares of Common stock  applicable  to payment of Common Stock  dividends to the
Selling  Shareholders  for the period July 1, 1999 through December 31, 1999  is
included herein.

      The following table sets forth as of December 31, 1999 certain information
with respect to the Selling  Shareholders.  CollaGenex cannot assure that any of
the  Selling  Shareholders  will offer for sale or sell any or all of the Shares
offered by them pursuant to this Prospectus.

<TABLE>
<CAPTION>

                                     Beneficial
                                     Ownership of       Number of      Beneficial
                                       Selling           Shares       Ownership of
            Name of                  Shareholders        Offered        Shares
     Selling Shareholders        Prior to Offering (1)   Hereby(2)  After Offering (2)
     --------------------        ---------------------  ----------  ------------------
                                   Number     Percent               Number   Percent
                                   ------     -------               ------   -------
<S>                             <C>           <C>         <C>       <C>         <C>
OCM Principal Opportunities
  Fund, L.P..................   1,662,630(3)  16.1(3)     34,680    1,627,950   15.8
Richard A. Horstmann.........     707,536(4)   8.0(4)      1,960      705,576    8.0
Marquette Venture
  Partners II, L.P...........     982,183(5)  11.2(5)      1,905      980,278   11.2
MVP II Affiliates Fund, L.P.       28,066(5)    *(5)          55       28,011     *
Robert J. Easton.............      66,083(6)    *(6)         392       65,691     *
Pebblebrook Partners Ltd.....       9,394(7)    *(7)         196        9,198     *

</TABLE>

- ------

*     Less than one percent


                                     - 11 -
<PAGE>


(1)   Such number of shares held includes  shares of Common Stock issued to each
      such holder in payment of dividends on the Preferred Stock declared by the
      Company's  Board of Directors in December 1999 and  distributed in January
      2000.  Applicable  percentage of ownership is based on 8,665,729 shares of
      Common Stock  outstanding  as of February 15, 2000,  plus any Common Stock
      equivalents or convertible  securities held, shares  beneficially owned by
      each such  holder  and  shares of Common  Stock  issued by the  Company in
      payment of dividends on the Preferred Stock as set forth herein.

(2)   Assumes  that all  Shares  to be  offered,  as set forth  above,  are sold
      pursuant to this  offering  and that no other  shares of Common  Stock are
      acquired  or  disposed  of  by  the  Selling
      Shareholders  prior  to the  termination  of this  offering.  Because  the
      Selling  Shareholders  may sell all,  some or none of their  Shares or may
      acquire or dispose of other shares of Common Stock,  no reliable  estimate
      can be made of the  aggregate  number of Shares that will be sold pursuant
      to this  offering or the number or  percentage  of shares of Common  Stock
      that each Selling Shareholder will own upon completion of this offering.

(3)   Stephen A. Kaplan,  a member of the  Company's  Board of  Directors,  is a
      Principal of Oaktree Capital Management, LLC, which is the general partner
      of OCM Principal  Opportunities  Fund, L.P.  ("OCM").  Includes  1,609,091
      shares of Common Stock  issuable upon the  conversion of 177,000 shares of
      Preferred  Stock held by OCM and 53,539  shares of Common  Stock issued in
      payment  of  dividends  on such  Preferred  Stock.  Mr.  Kaplan  expressly
      disclaims beneficial ownership of such shares, except to the extent of any
      indirect pecuniary interest therein.

(4)   Mr. Horstmann is a principal of Thomson  Horstmann & Bryant,  Inc. and, as
      such,  has the power to vote or to direct the vote of and to dispose of or
      direct the disposition of the shares owned by Thomson  Horstmann & Bryant,
      Inc. (613,600 shares of Common Stock). Mr. Horstmann  expressly  disclaims
      beneficial  ownership  of  such  shares,  except  as to his  proportionate
      interest in Thomson  Horstmann & Bryant,  Inc. Also includes 90,910 shares
      of Common Stock issuable upon the conversion of 10,000 shares of Preferred
      Stock held by Mr.  Horstmann  and 3,026  shares of Common  Stock issued in
      payment of dividends on such Preferred Stock.

(5)   James E.  Daverman,  a member  of the  Company's  Board of  Directors,  is
      President of Marquette  Management  Partners,  LLC, the general partner of
      Marquette Venture Partners, L.P. and a general partner of MG II, L.P., the
      general partner of Marquette  Venture Partners II, L.P.  ("Marquette") and
      MVP II Affiliates  Fund,  L.P.  ("MVP II") and, as such,  has the power to
      vote or direct the vote of and to dispose of or direct the  disposition of
      the shares  owned by Marquette  (which  includes  88,382  shares of Common
      Stock issuable upon the conversion of 9,722 shares of Preferred Stock held
      by Marquette,  2,941 shares of Common Stock issued in payment of dividends
      on such Preferred  Stock and 890,860 shares of Common Stock otherwise held
      by  Marquette)  and MVP II (which  includes  2,528  shares of Common Stock
      issuable upon the conversion of 278 shares of Preferred  Stock held by MVP
      II, 85 shares of Common  Stock  issued in  payment  of  dividends  on such
      Preferred  Stock and 25,453 shares of Common Stock  otherwise  held by MVP
      II). Mr. Daverman expressly disclaims beneficial ownership of such shares,
      except as to his proportionate interest in each of Marquette and MVP II.


                                     - 12 -
<PAGE>


(6)   Mr.  Easton  is a member of the  Company's  Board of  Directors.  Includes
      15,000 shares of Common Stock underlying  options which are exercisable as
      of February  15,  2000 or 60 days after such date.  Also  includes  18,182
      shares  of Common  Stock  issuable  upon the  conversion  of 2,000  shares
      Preferred  Stock held by Mr.  Easton and 606 shares of Common Stock issued
      in payment of dividends  on such  Preferred  Stock.  Also  includes  6,400
      shares of Common Stock held as trustee for Second Easton Family Charitable
      Trust and 25,895 shares of Common Stock otherwise held by Mr. Easton.
(7)   Includes  9,091 shares of Common Stock  issuable  upon the  conversion  of
      1,000 shares of Preferred Stock held by Pebblebrook  Partners Ltd. and 303
      shares of Common Stock  issued in payment of  dividends on such  Preferred
      Stock.

      All offering  expenses  are being paid by the Company  except the fees and
expenses of any counsel and other  advisors  that the Selling  Shareholders  may
employ to represent  them in  connection  with the offering and all brokerage or
underwriting  discounts or commissions paid to broker-dealers in connection with
the sale of the Shares.


                                     - 13 -
<PAGE>


                              PLAN OF DISTRIBUTION

      The Selling  Shareholders have not advised CollaGenex of any specific plan
for  distribution of the Shares offered hereby,  but it is anticipated  that the
Shares  will  be sold  from  time to  time  by the  Selling  Shareholders  or by
permitted  pledgees,  donees,  transferees  or  other  permitted  successors  in
interest. Such sales may be made in any of the following manners:

o     On the Nasdaq  National  Market (or through the facilities of any national
      securities exchange or U.S. inter-dealer  quotation system of a registered
      national  securities  association,  on which the Shares  are then  listed,
      admitted to unlisted trading privileges or included for quotation);

o     In public or privately negotiated transactions;

o     In transactions involving principals or brokers;

o     In a combination of such methods of sale; or

o     Any other lawful methods.

      Although  sales of the Shares  are,  in  general,  expected  to be made at
market  prices  prevailing  at the time of sale,  the Shares may also be sold at
prices related to such prevailing market prices or at negotiated  prices,  which
may differ considerably.

      In offering  the Shares  covered by this  Prospectus,  each of the Selling
Shareholders  and any  broker-dealers  who  sell  the  Shares  for  the  Selling
Shareholders may be "underwriters" within the meaning of the Securities Act, and
any profits  realized by such Selling  Shareholders and the compensation of such
broker-dealers may be underwriting discounts and commissions.

      Sales through  brokers may be made by any method of trading  authorized by
any stock exchange or market on which the Shares may be listed,  including block
trading in negotiated transactions. Without limiting the foregoing, such brokers
may act as  dealers  by  purchasing  any or all of the  Shares  covered  by this
Prospectus, either as agents for others or as principals for their own accounts,
and reselling such Shares pursuant to this Prospectus.  The Selling Shareholders
may effect such  transactions  directly,  or  indirectly  through  underwriters,
broker-dealers  or agents acting on their behalf. In connection with such sales,
such  broker-dealers  or  agents  may  receive   compensation  in  the  form  of
commissions,  concessions, allowances or discounts, any or all of which might be
in excess of customary amounts.

      Each of the Selling  Shareholders is acting independently of CollaGenex in
making  decisions  with  respect to the timing,  manner and size of each sale of
Shares. CollaGenex has not been advised of any definitive selling arrangement at
the  date  of  this   Prospectus   between  any  Selling   Shareholder  and  any
broker-dealer or agent.

      To the  extent  required,  the  names  of any  agents,  broker-dealers  or
underwriters and applicable commissions,  concessions,  allowances or discounts,
and any other required  information  with respect to any particular offer of the
Shares  by  the  Selling  Shareholders,  will  be  set  forth  in  a  Prospectus
Supplement.


                                     - 14 -
<PAGE>


      The  expenses  of  preparing  and filing this  Prospectus  and the related
Registration Statement with the SEC will be paid entirely by CollaGenex.  Shares
of Common Stock covered by this  Prospectus also may qualify to be sold pursuant
to Rule 144 under the Securities Act,  rather than pursuant to this  Prospectus.
The  Selling  Shareholders  have  been  advised  that  they are  subject  to the
applicable  provisions of the  Securities  Exchange Act of 1934, as amended (the
"Exchange Act"), including without limitation, Rule 10b-5 thereunder.

      Neither  CollaGenex  nor the  Selling  Shareholders  can  estimate  at the
present time the amount of commissions  or discounts,  if any, that will be paid
by the Selling Shareholders on account of their sales of the Shares from time to
time.

                                  LEGAL MATTERS

      The validity of the Shares of Common Stock  offered  hereby will be passed
upon for the Company by Buchanan Ingersoll Professional Corporation, 650 College
Road East, Princeton, New Jersey 08540.

                                     EXPERTS

      The   consolidated   financial   statements  and  schedule  of  CollaGenex
Pharmaceuticals, Inc. and subsidiaries as of December 31, 1998 and 1999, and for
each of the years in the three-year  period ended  December 31, 1999,  have been
incorporated by reference herein and in the  registration  statement in reliance
upon  the  report  of  KPMG  LLP,  independent   certified  public  accountants,
incorporated by reference herein, and upon the authority of said firm as experts
in accounting and auditing.

                      INFORMATION INCORPORATED BY REFERENCE

      The SEC allows  CollaGenex to  "incorporate  by reference" the information
CollaGenex  files  with  the SEC,  which  means  that  CollaGenex  can  disclose
important  information  to  you  by  referring  you  to  those  documents.   The
information  incorporated by reference is an important part of this  Prospectus,
and  information  that  CollaGenex  files later with the SEC will  automatically
update and supersede this information.  CollaGenex incorporates by reference the
documents  listed below and any future  filings made by CollaGenex  with the SEC
under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act until the filing of
a  post-effective   amendment  to  this  Prospectus  which  indicates  that  all
securities  registered  have been sold or which  deregisters all securities then
remaining unsold:

o     CollaGenex's  Annual  Report on Form 10-K for the year ended  December 31,
      1999 filed with the SEC on March 29, 2000;

o     All other reports  filed by CollaGenex  pursuant to Section 13(a) or 15(d)
      of the Exchange Act since December 31, 1999; and

o     The description of  CollaGenex's  Common Stock,  $.01 par value,  which is
      contained  in  CollaGenex's  Registration  Statement  on  Form  8-A  filed
      pursuant  to  Section  12(g)  of the  Exchange  Act in the  form  declared
      effective by the SEC on June 20, 1996,


                                     - 15 -
<PAGE>


      including  any  subsequent  amendments or reports filed for the purpose of
      updating such description.

      CollaGenex will provide to any person,  including any beneficial  owner of
its securities,  to whom this  Prospectus is delivered,  a copy of any or all of
the information  that has been  incorporated by reference in this Prospectus but
not delivered with this Prospectus. You may make such requests at no cost to you
by writing or telephoning CollaGenex at the following address or number:

                        CollaGenex Pharmaceuticals, Inc.
                        41 University Drive
                        Newtown, Pennsylvania 18940
                        Attention: Chief Financial Officer
                        Telephone: (215) 579-7388

      You should  rely only on the  information  incorporated  by  reference  or
provided in this  Prospectus or any  Prospectus  Supplement.  CollaGenex has not
authorized anyone else to provide you with different information.  CollaGenex is
not  making an offer of these  securities  in any  state  where the offer is not
permitted.  You should not assume that the information in this Prospectus or any
Prospectus  Supplement  is  accurate  as of any date  other than the date on the
front of those documents.

                       WHERE YOU CAN FIND MORE INFORMATION

      CollaGenex files annual,  quarterly and special reports,  proxy statements
and other  information  with the SEC.  CollaGenex's SEC filings are available to
the public over the Internet at the SEC's website at http://www.sec.gov. You may
also read and copy, at prescribed rates, any document  CollaGenex files with the
SEC at the SEC's Public  Reference Room at 450 Fifth Street,  N.W.,  Washington,
D.C.  20549 and at the regional  offices of the SEC at Seven World Trade Center,
Suite 1300,  New York,  New York 10048 and  Citicorp  Center,  500 West  Madison
Street,  Suite  1400,  Chicago,  Illinois  60661-2511.  Please  call  the SEC at
1-800-SEC-0330 for further information on the SEC's Public Reference Room.

      CollaGenex  has filed with the SEC a  Registration  Statement  on Form S-3
under the  Securities  Act with  respect  to the  Shares  offered  hereby.  This
Prospectus,  which constitutes a part of that registration  statement,  does not
contain all the  information  contained in the  registration  statement  and its
exhibits. For further information with respect to CollaGenex and the Shares, you
should consult the registration statement and its exhibits. Statements contained
in this  Prospectus  concerning the provisions of any documents are  necessarily
summaries of those documents, and each statement is qualified in its entirety by
reference  to the copy of the  document  filed  with the SEC.  The  registration
statement and any of its amendments,  including  exhibits filed as a part of the
registration  statement  or an  amendment  to the  registration  statement,  are
available for inspection and copying as described above.


                                     - 16 -
<PAGE>


                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

      Subsection  (a) of Section 145 of the  Delaware  General  Corporation  Law
empowers a  corporation  to indemnify  any person who was or is threatened to be
made a party to any threatened, pending or completed action, suit or proceeding,
whether civil,  criminal,  administrative or investigative (other than an action
by or in the right of the  corporation)  by reason of the fact that he or she is
or was a director,  officer, employee or agent of the corporation,  or is or was
serving at the request of the  corporation as a director,  officer,  employee or
agent  of  another  corporation,  partnership,  joint  venture,  trust  or other
enterprise,  against expenses (including attorneys' fees), judgments,  fines and
amounts paid in  settlement  actually and  reasonably  incurred by him or her in
connection with such action, suit or proceeding if he or she acted in good faith
and in a manner he or she  reasonably  believed  to be in or not  opposed to the
best interests of the  corporation,  and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his or her conduct was unlawful.

      Subsection  (b) of Section 145 empowers a  corporation  to  indemnify  any
person  who  was or is a  party  or is  threatened  to be  made a  party  to any
threatened,  pending  or  completed  action  or suit by or in the  right  of the
corporation  to procure a judgment in its favor by reason of the fact that he or
she is or was a director,  officer, employee or agent of the corporation,  or is
or was  serving  at the  request  of the  corporation  as a  director,  officer,
employee or agent of another corporation,  partnership,  joint venture, trust or
other  enterprise,  against  expenses  (including  attorneys' fees) actually and
reasonably  incurred by him or her in connection  with the defense or settlement
of such  action or suit if he or she  acted in good  faith and in a manner he or
she  reasonably  believed to be in or not opposed to the best  interests  of the
corporation and except that no  indemnification  shall be made in respect of any
claim,  issue or matter as to which such person  shall have been  adjudged to be
liable  to the  corporation  unless  and only to the  extent  that the  Court of
Chancery or the court in which such action or suit was brought  shall  determine
upon application that,  despite the adjudication of liability but in view of all
of the circumstances of the case, such person is fairly and reasonably  entitled
to indemnity for such  expenses  which the Court of Chancery or such other court
shall deem proper.

      Section 145 further provides that to the extent a director or officer of a
corporation has been successful in the defense of any action, suit or proceeding
referred to in subsection  (a) and (b) or in the defense of any claim,  issue or
matter  therein,  he or she shall be  indemnified  against  expenses  (including
attorneys'  fees) actually and  reasonably  incurred by him or her in connection
therewith;  that the indemnification provided by Section 145 shall not be deemed
exclusive  of any other rights to which the  indemnified  party may be entitled;
and that the scope of indemnification extends to directors, officers, employees,
or agents of a constituent corporation absorbed in a consolidation or merger and
persons serving in that capacity at the request of the  constituent  corporation
for another.  Section 145 also empowers the corporation to purchase and maintain
insurance  on behalf of a director  or officer of the  corporation  against  any
liability  asserted  against  him or her or  incurred  by him or her in any such
capacity  or  arising  out of his or her  status  as  such  whether  or not  the
corporation  would  have  the  power  to  indemnify  him  or  her  against  such
liabilities under Section 145.


                                     - 17 -
<PAGE>


      Article  IX  of  CollaGenex's  By-laws  specifies  that  CollaGenex  shall
indemnify its directors, officers, employees and agents because he or she was or
is a  director,  officer,  employee  or  agent of the  Corporation  or was or is
serving at the request of the  Corporation as a director,  officer,  employee or
agent of  another  entity to the full  extent  that such right of  indemnity  is
permitted by the laws of the State of Delaware. This provision of the By-laws is
deemed to be a contract  between  CollaGenex  and each  director and officer who
serves in such  capacity  at any time  while  such  provision  and the  relevant
provisions of the Delaware General Corporation Law are in effect, and any repeal
or  modification  thereof  shall  not  offset  any  action,  suit or  proceeding
theretofore or thereafter  brought or threatened  based in whole or in part upon
any such state of facts.  The affirmative vote of the holders of at least 80% of
the voting power of all  outstanding  shares of the capital stock of CollaGenex,
and, in certain  circumstances,  66 2/3% of the voting power of all  outstanding
shares of the Series D Cumulative Convertible Preferred Stock of the Company, is
required to adopt, amend or repeal such provision of the By-laws.

      CollaGenex  has  executed  indemnification  agreements  with  each  of its
officers and directors pursuant to which CollaGenex has agreed to indemnify such
parties to the full extent permitted by law, subject to certain  exceptions,  if
such party  becomes  subject  to an action  because  such  party is a  director,
officer, employee, agent or fiduciary of CollaGenex.

      Section  102(b)(7)  of the  Delaware  General  Corporation  Law  enables a
corporation in its certificate of incorporation to limit the personal  liability
of members of its board of directors  for  violation  of a director's  fiduciary
duty of care. This Section does not, however,  limit the liability of a director
for breaching his or her duty of loyalty, failing to act in good faith, engaging
in intentional  misconduct or knowingly violating a law, or from any transaction
in which the director derived an improper  personal  benefit.  This Section also
will have no effect on claims arising under the federal securities laws.

      CollaGenex's  Amended and Restated Certificate of Incorporation limits the
liability of its directors as authorized by Section  102(b)(7).  The affirmative
vote of the  holders  of at least  75% of the  voting  power of all  outstanding
shares of the capital stock of  CollaGenex,  and, in certain  circumstances,  66
2/3% of the voting  power of all  outstanding  shares of the Series D Cumulative
Convertible   Preferred  Stock  of  the  Company,  is  required  to  amend  such
provisions.

      CollaGenex  has  obtained  liability  insurance  for  the  benefit  of its
directors  and officers  which  provides  coverage  for losses of directors  and
officers for  liabilities  arising out of claims  against such persons acting as
directors  or officers of  CollaGenex  (or any  subsidiary  thereof)  due to any
breach of duty, neglect, error, misstatement,  misleading statement, omission or
act done by such directors and officers, except as prohibited by law.

      Insofar as  indemnification  for liabilities  arising under the Securities
Act may be permitted to  directors,  officers,  and  controlling  persons of the
Company pursuant to the foregoing provisions, or otherwise, the Company has been
advised that in the opinion of the SEC such  indemnification  is against  public
policy as expressed in the Securities Act and is, therefore, unenforceable.


                                     - 18 -
<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

         SEC registration fee............................   $   100.55
         Counsel fees and expenses*......................   $20,000.00
         Accounting fees and expenses*...................   $ 5,000.00
                                                            -----------
            Total*.......................................   $25,100.55
                                                            ==========

*     Estimated

      All  expenses of issuance and  distribution  listed above will be borne by
the Company. The costs of fees and expenses of legal counsel and other advisors,
if any, that the Selling  Shareholders  employ in  connection  with the offering
will be borne by the Selling Shareholders.


Item 15.  Indemnification of Directors and Officers.

      Subsection  (a) of Section 145 of the  Delaware  General  Corporation  Law
empowers a  corporation  to indemnify  any person who was or is threatened to be
made a party to any threatened, pending or completed action, suit or proceeding,
whether civil,  criminal,  administrative or investigative (other than an action
by or in the right of the  corporation)  by reason of the fact that he or she is
or was a director,  officer, employee or agent of the corporation,  or is or was
serving at the request of the  corporation as a director,  officer,  employee or
agent  of  another  corporation,  partnership,  joint  venture,  trust  or other
enterprise,  against expenses (including attorneys' fees), judgments,  fines and
amounts paid in  settlement  actually and  reasonably  incurred by him or her in
connection with such action, suit or proceeding if he or she acted in good faith
and in a manner he or she  reasonably  believed  to be in or not  opposed to the
best interests of the  corporation,  and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his or her conduct was unlawful.

      Subsection  (b) of Section 145 empowers a  corporation  to  indemnify  any
person  who  was or is a  party  or is  threatened  to be  made a  party  to any
threatened,  pending  or  completed  action  or suit by or in the  right  of the
corporation  to procure a judgment in its favor by reason of the fact that he or
she is or was a director,  officer, employee or agent of the corporation,  or is
or was  serving  at the  request  of the  corporation  as a  director,  officer,
employee or agent of another corporation,  partnership,  joint venture, trust or
other  enterprise,  against  expenses  (including  attorneys' fees) actually and
reasonably  incurred by him or her in connection  with the defense or settlement
of such  action or suit if he or she  acted in good  faith and in a manner he or
she  reasonably  believed to be in or not opposed to the best  interests  of the
corporation and except that no  indemnification  shall be made in respect of any
claim,  issue or matter as to which such person  shall have been  adjudged to be
liable  to the  corporation  unless  and only to the  extent  that the  Court of
Chancery or the court in which such action or suit was brought  shall  determine
upon application that,  despite the adjudication of liability but in view of all
of the circumstances of the


                                      II-1
<PAGE>


case,  such  person is fairly and  reasonably  entitled  to  indemnity  for such
expenses which the Court of Chancery or such other court shall deem proper.

      Section 145 further provides that to the extent a director or officer of a
corporation has been successful in the defense of any action, suit or proceeding
referred to in subsection  (a) and (b) or in the defense of any claim,  issue or
matter  therein,  he or she shall be  indemnified  against  expenses  (including
attorneys'  fees) actually and  reasonably  incurred by him or her in connection
therewith;  that the indemnification provided by Section 145 shall not be deemed
exclusive  of any other rights to which the  indemnified  party may be entitled;
and that the scope of indemnification extends to directors, officers, employees,
or agents of a constituent corporation absorbed in a consolidation or merger and
persons serving in that capacity at the request of the  constituent  corporation
for another.  Section 145 also empowers the corporation to purchase and maintain
insurance  on behalf of a director  or officer of the  corporation  against  any
liability  asserted  against  him or her or  incurred  by him or her in any such
capacity  or  arising  out of his or her  status  as  such  whether  or not  the
corporation  would  have  the  power  to  indemnify  him  or  her  against  such
liabilities under Section 145.

      Article  IX  of  CollaGenex's  By-laws  specifies  that  CollaGenex  shall
indemnify its directors, officers, employees and agents because he or she was or
is a  director,  officer,  employee  or  agent of the  Corporation  or was or is
serving at the request of the  Corporation as a director,  officer,  employee or
agent of  another  entity to the full  extent  that such right of  indemnity  is
permitted by the laws of the State of Delaware. This provision of the By-laws is
deemed to be a contract  between  CollaGenex  and each  director and officer who
serves in such  capacity  at any time  while  such  provision  and the  relevant
provisions of the Delaware General Corporation Law are in effect, and any repeal
or  modification  thereof  shall  not  offset  any  action,  suit or  proceeding
theretofore or thereafter  brought or threatened  based in whole or in part upon
any such state of facts.  The affirmative vote of the holders of at least 80% of
the voting power of all  outstanding  shares of the capital stock of CollaGenex,
and, in certain  circumstances,  66 2/3% of the voting power of all  outstanding
shares of the Series D Cumulative Convertible Preferred Stock of the Company, is
required to adopt, amend or repeal such provision of the By-laws.

      CollaGenex  has  executed  indemnification  agreements  with  each  of its
officers and directors pursuant to which CollaGenex has agreed to indemnify such
parties to the full extent permitted by law, subject to certain  exceptions,  if
such party  becomes  subject  to an action  because  such  party is a  director,
officer, employee, agent or fiduciary of CollaGenex.

      Section  102(b)(7)  of the  Delaware  General  Corporation  Law  enables a
corporation in its certificate of incorporation to limit the personal  liability
of members of its board of directors  for  violation  of a director's  fiduciary
duty of care. This Section does not, however,  limit the liability of a director
for breaching his or her duty of loyalty, failing to act in good faith, engaging
in intentional  misconduct or knowingly violating a law, or from any transaction
in which the director derived an improper  personal  benefit.  This Section also
will have no effect on claims arising under the federal securities laws.

      CollaGenex's  Amended and Restated Certificate of Incorporation limits the
liability of its directors as authorized by Section  102(b)(7).  The affirmative
vote of the  holders  of at least  75%


                                      II-2
<PAGE>


of  the  voting  power  of  all  outstanding  shares  of the  capital  stock  of
CollaGenex,  and, in certain  circumstances,  66 2/3% of the voting power of all
outstanding shares of the Series D Cumulative Convertible Preferred Stock of the
Company, is required to amend such provisions.

      CollaGenex  has  obtained  liability  insurance  for  the  benefit  of its
directors  and officers  which  provides  coverage  for losses of directors  and
officers for  liabilities  arising out of claims  against such persons acting as
directors  or officers of  CollaGenex  (or any  subsidiary  thereof)  due to any
breach of duty, neglect, error, misstatement,  misleading statement, omission or
act done by such directors and officers, except as prohibited by law.


                                      II-3
<PAGE>


Item 16.  Exhibits.

      Exhibit No.                        Description of Exhibit
      -----------                        ----------------------

           5            Opinion of Buchanan Ingersoll Professional Corporation
                        as to legality of the Shares of Common Stock.

          23.1          Consent of KPMG LLP.

          23.2          Consent of Buchanan Ingersoll Professional Corporation
                        (contained in the opinion filed as Exhibit 5 to the
                        Registration Statement).

          24            Powers of Attorney of certain officers and directors of
                        the Company (contained on the signature page of this
                        Registration Statement).


Item 17.  Undertakings.

    (a)  The undersigned Registrant hereby undertakes:

            (1) To file,  during any  period in which  offers or sales are being
made, a post-effective  amendment to this Registration  Statement to include any
material  information  with respect to the plan of  distribution  not previously
disclosed  in  this  Registration  Statement  or any  material  change  to  such
information in this Registration Statement.

            (2) That,  for the purpose of  determining  any liability  under the
Securities Act, each such  post-effective  amendment shall be deemed to be a new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

            (3)  To  remove  from  registration  by  means  of a  post-effective
amendment  any of the  securities  being  registered  which remain unsold at the
termination of the offering.

    (b) The  undersigned  registrant  hereby  undertakes  that,  for purposes of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
registrant's  annual  report  pursuant to Section 13(a) or 15(d) of the Exchange
Act (and,  where  applicable,  each filing of an employee  benefit plan's annual
report  pursuant to Section 15(d) of the Exchange Act) that is  incorporated  by
reference in the registration statement shall be deemed to be a new registration
statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof.

    (c) Insofar as indemnification  for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Registrant pursuant to the foregoing  provisions,  or otherwise,  the Registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore,  unenforceable. In the event that a claim for indemnification
against such  liabilities  (other than the payment by the Registrant of expenses
incurred or paid by a director,  officer or controlling person of the Registrant
in the successful defense of any action,


                                      II-4
<PAGE>


suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the Registrant will, unless
in the  opinion  of its  counsel  the matter  has been  settled  by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification  by it is  against  public  policy  as  expressed  in  the
Securities Act and will be governed by the final adjudication of such issue.


                                      II-5
<PAGE>


                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the city of Newtown,  State of  Pennsylvania on this 26th day of
April, 2000.

                                    COLLAGENEX PHARMACEUTICALS, INC.



                                    By: /s/  Brian M. Gallagher, Ph.D.
                                        -------------------------------------
                                        Brian M. Gallagher, Ph.D.
                                        President and Chief Executive Officer






                                      II-6
<PAGE>


                                POWER OF ATTORNEY

      KNOW ALL MEN BY THESE  PRESENTS,  that  each  individual  whose  signature
appears below  constitutes and appoints Brian M.  Gallagher,  Ph.D. and Nancy C.
Broadbent,  and each of them, his true and lawful  attorneys-in-fact  and agents
with full power of  substitution  and  resubstitution,  for him and in his name,
place  and  stead,  in any and all  capacities,  to sign any and all  amendments
(including  post-effective  amendments) to this Registration  Statement,  and to
file the  same  with all  exhibits  thereto,  and all  documents  in  connection
therewith,  with the  Securities  and Exchange  Commission,  granting  unto said
attorneys-in-fact  and agents,  and each of them, full power and authority to do
and perform each and every act and thing  requisite  and necessary to be done in
and about the  premises,  as fully to all  intents  and  purposes as he might or
could  do  in  person,   hereby   ratifying   and   confirming   all  that  said
attorneys-in-fact  and  agents  or any of them,  or their or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

      Pursuant  to  the  requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.

           Signature                         Title                    Date

/s/Brian M. Gallagher, Ph.D.      President, Chief Executive     April 26, 2000
- -------------------------------   Officer and Director
Brian M. Gallagher, Ph.D.         (Principal Executive Officer)

/s/Nancy C. Broadbent             Chief Financial Officer,       April 26, 2000
- -------------------------------   Treasurer and Secretary
Nancy C. Broadbent                (Principal Financial and
                                  Accounting Officer)

/s/Helmer P.K. Agersborg, Ph.D.   Chairman of the Board and      April 26, 2000
- -------------------------------   Director
Helmer P.K. Agersborg, Ph.D.

/s/Peter Barnett, D.M.D.          Director                       April 26, 2000
- -------------------------------
Peter Barnett, D.M.D.

/s/Robert C. Black                Director                       April  7, 2000
- -------------------------------
Robert C. Black

/s/James E. Daverman              Director                       April 26, 2000
- -------------------------------
James E. Daverman

/s/Robert J. Easton               Director                       April 26, 2000
- -------------------------------
Robert J. Easton

/s/Stephen A. Kaplan             Director                        April 26, 2000
- -------------------------------
Stephen A. Kaplan

/s/Stephen W. Ritterbush, Ph.D.   Director                       April 26, 2000
- -------------------------------
Stephen W. Ritterbush, Ph.D.

/s/Terence E. Winters, Ph.D.      Director                       April  9, 2000
- -------------------------------
Terence E. Winters, Ph.D.


                                      II-7
<PAGE>


                                  EXHIBIT INDEX

      Exhibit No.                        Description of Exhibit
      -----------                        ----------------------

           5            Opinion of Buchanan Ingersoll Professional Corporation
                        as to legality of the Shares of Common Stock.

          23.1          Consent of KPMG LLP.

          23.2          Consent of Buchanan Ingersoll Professional Corporation
                        (contained in the opinion filed as Exhibit 5 to the
                        Registration Statement).

          24            Powers of Attorney of certain officers and directors of
                        the Company (contained on the signature page of this
                        Registration Statement).





                                                                       EXHIBIT 5

                   BUCHANAN INGERSOLL PROFESSIONAL CORPORATION
                         (Incorporated in Pennsylvania)
                                    Attorneys
                              650 College Road East
                           Princeton, New Jersey 08540



                                    April 26, 2000


CollaGenex Pharmaceuticals, Inc.
41 University Drive
Newtown, Pennsylvania 18940

Gentlemen:

      We have acted as counsel to CollaGenex  Pharmaceuticals,  Inc., a Delaware
corporation (the  "Company"),  in connection with the filing by the Company of a
Registration  Statement on Form S-3 (the  "Registration  Statement"),  under the
Securities Act of 1933, as amended, relating to the registration of an aggregate
of 39,188 shares (the "Shares") of the Company's  common stock,  $.01 par value,
all of  which  are to be  offered  by the  selling  shareholders  (the  "Selling
Shareholders") as set forth therein.

      In  connection  with the  Registration  Statement,  we have  examined such
corporate records and documents,  other documents,  and such questions of law as
we have deemed  necessary or  appropriate  for purposes of this opinion.  On the
basis of such examination, it is our opinion that:

      1. The  issuance of the Shares  issued in  connection  with the payment of
dividends to the Selling Shareholders with respect to their respective ownership
of the Company's Series D Cumulative Convertible Preferred Stock, as declared by
the Company's Board of Directors on November 19, 1999 (the "Dividend  Payment"),
was duly and validly authorized; and

      2. The  Shares  issued in  connection  with the  Dividend  Payment  to the
Selling Shareholders are legally issued, fully paid and non-assessable.

      We hereby  consent  to the  filing  of this  opinion  as  Exhibit 5 to the
Registration  Statement  and to the  reference  to this firm  under the  heading
"Legal Matters" in the Registration Statement.

                                    Very truly yours,

                                    BUCHANAN INGERSOLL PROFESSIONAL CORPORATION

                                    /s/  William J. Thomas
                                    ----------------------------
                                    By:  William J. Thomas, Esq.
                                          a member of the firm






                                                                    EXHIBIT 23.1


                              Accountants' Consent

The Board of Directors
CollaGenex Pharmaceuticals, Inc.:

We consent to the use of our report  incorporated herein by reference and to the
reference to our firm under the heading "Experts" in the prospectus.

                                                                /s/ KPMG LLP

Princeton, New Jersey
April 24, 2000




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