COLLAGENEX PHARMACEUTICALS INC
S-8 POS, 1999-10-12
PHARMACEUTICAL PREPARATIONS
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     As filed with the Securities and Exchange Commission on October 8, 1999
                                                    Registration No. 333-31229


                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                 ---------------
                        POST-EFFECTIVE AMENDMENT NO. 1 TO
                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                        COLLAGENEX PHARMACEUTICALS, INC.
- --------------------------------------------------------------------------------
             (Exact Name of Registrant as Specified in its Charter)

                               41 University Drive
     Delaware              Newtown, Pennsylvania 18940            52-1758016
- --------------------     -------------------------------     -------------------
(State or Other               (Address of Principal          (I.R.S. Employer
Jurisdiction of                 Executive Offices)           Identification No.)
Incorporation or                   (Zip Code)
Organization)

                       1992 Stock Option Plan, as amended
                                 1996 Stock Plan
            1996 Non-Employee Director Stock Option Plan, as amended
                              May/June 1996 Options
                              January 1999 Options
- --------------------------------------------------------------------------------
                            (Full Title of the Plans)

                            Brian M. Gallagher, Ph.D.
                      President and Chief Executive Officer
                        CollaGenex Pharmaceuticals, Inc.
                               41 University Drive
                           Newtown, Pennsylvania 18940
- --------------------------------------------------------------------------------
                              (Name and Address of
                               Agent for Service)

                                 (215) 579-7388
- --------------------------------------------------------------------------------
                     (Telephone Number, Including Area Code,
                              of Agent For Service)

                                    Copy To:

                           Richard S. Mattessich, Esq.
                   Buchanan Ingersoll Professional Corporation
                              500 College Road East
                               Princeton, NJ 08540
                                 (609) 987-6800


<PAGE>


                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>

====================================================================================================================
                                                                           Proposed
                                                                            Maximum         Proposed
                                                              Amount       Offering          Maximum      Amount Of
         Title Of Securities                                   To Be         Price          Aggregate    Registration
          To Be Registered                                 Registered(1)   Per Share     Offering Price     Fee
- --------------------------------------------------------------------------------------------------------------------
<S>                                                           <C>         <C>            <C>                <C>
Common Stock, par value $.01 per share:

   Shares to be issued pursuant to prior option
       grants under the 1996 Stock Plan..............         170,000     $  9.71(2)     $  1,650,700(2)    $   459.

   Shares to be issued pursuant to future option
     grants under the 1996 Stock Plan................         750,000     $ 18.10(3)     $ 13,575,000(3)    $ 3,774.

   Shares to be issued pursuant to prior option
     grants under the 1996 Non-Employee Director
     Stock Option Plan...............................         200,000     $ 10.35(4)     $  2,070,000(4)    $   576.

   Shares issued pursuant to prior option grants
     under the May/June 1996 Options.................           7,125     $  2.00(5)     $     14,250(5)    $     4.

   Shares to be issued pursuant to prior option
     grants under the May/June 1996 Options..........           3,875     $  2.00(6)     $      7,750(6)    $     3.

   Shares to be issued pursuant to prior option
     grants under the January 1999 Options...........           7,500     $ 10.0625(7)   $     75,469(7)    $    21.
- --------------------------------------------------------------------------------------------------------------------
       TOTAL.........................................       1,138,500                    $ 17,393,169       $ 4,837.

</TABLE>


- ----------

(1)   For the sole purpose of calculating  the  registration  fee, the number of
      shares to be registered under this Registration Statement has been divided
      among six (6) subtotals.

(2)   Pursuant to Rule 457(h),  these prices are calculated  based on a weighted
      average  exercise price of $9.71 per share covering 170,000 shares subject
      to stock options granted under the 1996 Stock Plan.

(3)   Pursuant to Rule 457(h) and Rule 457(c), these prices are estimated solely
      for the purpose of calculating the registration fee and are based upon the
      average of the bid and asked prices of the  Company's  Common Stock on the
      Nasdaq National Market on October 6, 1999.

(4)   Pursuant to Rule 457(h),  these prices are calculated  based on a weighted
      average exercise price of $10.35 per share covering 200,000 shares subject
      to stock options granted under the 1996 Non-Employee Director Stock Option
      Plan.

(5)   Pursuant to Rule 457(h),  these prices are calculated  based on a weighted
      average exercise price of $2.00 per share covering 7,125 shares subject to
      stock options granted under the May/June 1996 Options.

(6)   Pursuant to Rule 457(h),  these prices are calculated  based on a weighted
      average exercise price of $2.00 per share covering 3,875 shares subject to
      stock options granted under the May/June 1996 Options.


                                     - ii -
<PAGE>


(7)   Pursuant to Rule 457(h),  these prices are calculated  based on a weighted
      average exercise price of $10.0625 per share covering 7,500 shares subject
      to stock options granted under the January 1999 Options.

      Pursuant to Rule 416 under the  Securities  Act of 1933, as amended,  this
Registration  Statement also covers an indeterminate  number of shares as may be
issued as a result of the  anti-dilution  provisions of the 1996 Stock Plan, the
1996 Non-Employee  Director Stock Option Plan, the May/June 1996 Options and the
January 1999 Options.

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


                                    - iii -
<PAGE>


                                EXPLANATORY NOTE

      This Registration Statement contains two parts:

      The first part contains a Reoffer Prospectus (the  "Prospectus")  prepared
in accordance with the requirements of Part I of Form S-3. The Prospectus covers
reoffers  and resales of shares of common  stock,  $.01 par value per share (the
"Common Stock"),  of CollaGenex  Pharmaceuticals,  Inc.  ("CollaGenex")  or (the
"Company")  by certain  affiliates  of the  Company  (370,000  shares) and those
non-affiliates  of the  Company  who have  exercised  previously  granted  stock
options prior to the  registration  of the shares  underlying such stock options
(7,125 shares). All such individuals are listed on the Selling Shareholder table
herein.

      The second  part  contains  an  amendment  to  CollaGenex's  Form S-8 with
respect to an additional  750,000 shares of Common Stock authorized for issuance
upon the  exercise  of options to be granted  pursuant  to the 1996 Stock  Plan,
3,875 shares of Common Stock  authorized  for issuance  upon the exercise of the
May/June 1996 Options and 7,500 shares of Common Stock  authorized  for issuance
upon the exercise of the January 1999  Options.  Such  amendment is made for the
exercise of options by non-affiliates. CollaGenex initially filed a Registration
Statement on Form S-8 (Registration Statement No. 333-31229) with the Securities
and Exchange  Commission  on July 14, 1997 with respect to its 1992 Stock Option
Plan, the 1996 Stock Plan and the 1996 Non-Employee Director Stock Option Plan.


                                     - iv -
<PAGE>


                                   PROSPECTUS


                  S-3 Reoffer Prospectus dated October 8, 1999

                        COLLAGENEX PHARMACEUTICALS, INC.

                         377,125 Shares of Common Stock
                  Issued or Issuable under the 1996 Stock Plan,
                the 1996 Non-Employee Director Stock Option Plan,
                and certain May/June 1996 Stock Option Agreements


      This  Prospectus  relates to the public  resale,  from time to time, of an
aggregate of 377,125 shares (the  "Shares") of our Common Stock,  $.01 par value
(the "Common  Stock") by certain  shareholders  identified  below in the section
entitled "The Selling  Shareholders."  These Shares have been or may be acquired
upon the exercise of stock options granted  pursuant to our 1996 Stock Plan, our
1996  Non-Employee  Director  Stock Option Plan and certain  May/June 1996 Stock
Option Agreements (the "Plans").

      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 October 6, 1999,  the closing  sale price of our Common  Stock on the
Nasdaq National Market was $17.9375 per share.

         INVESTING IN THE COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
                    SEE "RISK FACTORS" BEGINNING ON PAGE 4.

      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.

                 The date of this Prospectus is October 8, 1999.



<PAGE>


                          PROSPECTUS TABLE OF CONTENTS

                                                                            Page
                                                                            ----

Special Note Regarding Forward-Looking Information......................     3
CollaGenex Pharmaceuticals, Inc.........................................     3
Risk Factors............................................................     4
     Uncertainty of Market Acceptance of Periostat......................     4
     Dependence on Principal Product....................................     4
     Historical Losses..................................................     5
     Ability to Grow Internally.........................................     5
     Limited Marketing and Sales History; Dependence on Marketing            5
     Partners...........................................................
     Dependence on Patents, License and Proprietary Rights; Enforcement      5
     of Rights..........................................................
     Dependence on Suppliers and Manufacturers..........................     8
     Uncertainty of Third Party Reimbursement and Health Care Reform....     8
     Competition and Rapid Technology Change............................     9
     Uncertainty of New Product Development or Commercialization........     9
     Extensive Government Regulation....................................     9
     Dependence on Key Personnel........................................    10
     Product Liability..................................................    11
     Future Capital Needs...............................................    11
     Risks Associated with the Year 2000................................    11
     Anti-Takeover Effect of Certain Charter and By-Law Provisions and
        Delaware Law....................................................    12
     Control by Management and Existing Shareholders....................    13
Use of Proceeds.........................................................    14
The Selling Shareholders................................................    14
Plan of Distribution....................................................    18
Legal Matters...........................................................    19
Experts.................................................................    19
Information Incorporated by Reference...................................    19
Where You Can Find More Information.....................................    20
Indemnification of Directors and Officers...............................    21



                                     - 2 -
<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,  risks  inherent in research and  development  activities,  risks
associated with conducting  business in a highly  regulated  environment,  risks
relating to  CollaGenex's  Year 2000  compliance and the Year 2000 compliance of
CollaGenex's vendors, suppliers, manufacturers, distributors, marketing partners
and certain  other  parties  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 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.  (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  130  sales
representatives  and managers.  This sales force also  co-promotes  Vioxx(R),  a
prescription  non-steroidal  anti-inflammatory  drug  developed  by Merck & Co.,
Inc.,  and  Denavir(R),   a  prescription  cold  sore  medication  developed  by
SmithKline Beecham. 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.



                                     - 3 -
<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
United States Food and Drug  Administration  (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.



                                     - 4 -
<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 June 30, 1999  aggregate  product sales of
Periostat were $8.7 million.  During the first six months of 1999 we experienced
a net  loss of  approximately  $9.2  million.  For  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 June 30, 1999,  we
have  experienced  an  aggregate  net loss of $47.2  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 144 employees as of
June 30, 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



                                     - 5 -
<PAGE>


limitation:  our  ability  to obtain  and  maintain  patent  protection  for our
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.  Nineteen United States patents held by SUNY and ten United
States  patent  applications  held by SUNY are  licensed  to us  under  the SUNY
License.  The patents  licensed from SUNY expire between 2004 and 2017. Of those
patents  specifically  related to Periostat,  the first expires in 2004, and the
second  expires by the year 2007. Of the nineteen  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 ten 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.   A  patent  application
corresponding  to the  Secondary  Patent  is  pending  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



                                     - 6 -
<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



                                     - 7 -
<PAGE>


research collaborators in academic institutions and request the collaborators to
conduct tests in 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.



                                     - 8 -
<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").



                                     - 9 -
<PAGE>


      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  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



                                     - 10 -
<PAGE>


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 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.

      RISKS ASSOCIATED WITH THE YEAR 2000.

      Assessment
      ----------

      We believe our exposure to Year 2000 problems lies primarily in two areas:
(i) our own internal operating  systems;  and (ii) Year 2000 compliance by third
parties  with  whom  we  have  material  relationships.  We  have  completed  an
assessment of our principal  internal  systems.  However,  we are  continuing to
assess our Year 2000 exposure with respect to third parties.  While the costs of
these  assessment  efforts are not  expected  to be  material  to our  financial
condition or any year's  results of  operations,  we cannot assure you that this
will be the case.

      Internal Operating Systems
      --------------------------

      We believe that our principal internal systems are Year 2000 compliant. We
recently installed upgraded versions of our internal accounting,  management and
financial reporting  applications which the vendor has represented are Year 2000
compliant. Some of our non-critical applications,  however, may not be Year 2000
compliant.  We are  currently  conducting  a program to identify and resolve any
such exposure. Although the costs related to these efforts are not



                                     - 11 -
<PAGE>


expected to be  material  to our  business,  financial  condition  or results of
operations, we cannot assure you that this will be the case.

      Third-Party Relationships
      -------------------------

      We are  conducting a program to identify  and resolve  Year 2000  exposure
from  third  parties.  We are  presently  conducting  inquiries  of our  outside
vendors, suppliers, manufacturers, distributors and marketing partners to assess
their  Year 2000  readiness.  Any  failure  of third  parties  with whom we have
material  relationships  to resolve Year 2000  problems in a timely manner could
materially  adversely  affect our  business,  financial  condition or results of
operations.

      Risks of Our Year 2000 Issues
      -----------------------------

      We expect to  identify  and  resolve  all Year 2000  problems  that  could
materially  adversely  affect our  business,  financial  condition or results of
operations.  However,  we believe  that it is not  possible  to  determine  with
complete certainty that all Year 2000 problems affecting us have been identified
or will be corrected.  Further,  we cannot accurately  predict how many failures
related  to the Year  2000  problem  will  occur or the  severity,  duration  or
financial  consequences of such failures.  As a result,  we expect that we could
possibly suffer the following consequences:

      o     A   significant    number   of   operational    inconveniences   and
            inefficiencies for us and our customers that may divert our time and
            attention  and  financial  and  human  resources  from our  ordinary
            business activities; and

      o     A lesser number of serious system  failures  (whether our systems or
            those of our vendors,  suppliers,  manufacturers,  distributors  and
            marketing  partners) that may require significant efforts by us, our
            customers or third parties to prevent or alleviate material business
            disruptions.

      Costs
      -----

      Other than time spent by our own  personnel,  to date we have not incurred
any significant costs in identifying and remediating Year 2000 problems.

      Our Contingency Plans
      ---------------------

      We believe our plans for addressing the Year 2000 problem are adequate. We
do not believe we will incur a material  financial  impact from system failures,
or from the costs  associated with assessing and addressing the risks of failure
arising from the Year 2000 problem.  Consequently,  we do not intend to create a
detailed  contingency plan. In the event that we do not adequately  identify and
resolve our Year 2000  issues,  the absence of a detailed  contingency  plan may
materially  adversely  affect our business,  financial  condition and results of
operations.

      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-



                                     - 12 -
<PAGE>


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  55% 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.



                                     - 13 -
<PAGE>


                                 USE OF PROCEEDS

      CollaGenex  will not  receive  any  proceeds  from the sale of the  Shares
covered by this Prospectus. While CollaGenex will receive sums upon any exercise
of options by the Selling  Shareholders,  CollaGenex  currently has no plans for
their application,  other than for general corporate purposes. CollaGenex cannot
assure you that any of such options will be exercised.

                            THE SELLING SHAREHOLDERS

      The  individuals  listed below (the "Selling  Shareholders")  have or will
acquire  the  Shares  being  registered  pursuant  to the  exercise  of  options
previously  granted  to  them  by  CollaGenex.  The  Shares  may  not be sold or
otherwise   transferred  by  the  Selling  Shareholders  unless  and  until  the
applicable options are exercised in accordance with their terms.

      The following table sets forth: (i) the name of each Selling  Shareholder;
(ii)  his or  her  position(s),  office  or  other  material  relationship  with
CollaGenex and its predecessors or affiliates,  over the last three years; (iii)
the number of shares of Common Stock owned (or subject to options or convertible
securities) by each Selling  Shareholder  as of the date of this  Prospectus and
prior to this  offering;  (iv) the number of shares of Common Stock which may be
offered and are being registered for the account of each Selling  Shareholder by
this  Prospectus  (all of which  have  been or may be  acquired  by the  Selling
Shareholders  pursuant  to the  exercise of options  subject to the  appropriate
vesting of such options); and (v) the amount of Common Stock to be owned by each
such Selling  Shareholder if such Selling  Shareholder were to sell all of their
shares of Common Stock covered by this Prospectus.

      CollaGenex  cannot  assure you 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.



                                     - 14 -
<PAGE>


<TABLE>
<CAPTION>

                                                                    NUMBER OF                          NUMBER OF
                                                                     SHARES/                            SHARES/
                                                                  PERCENTAGE OF                     PERCENTAGE OF
                                                                  COMMON STOCK                       COMMON STOCK
                                                                    PRIOR TO          NUMBER OF       OWNED AFTER
                                                                 OFFERING (BOTH       SHARES OF      THE OFFERING
                                                                  HELD DIRECTLY        COMMON         (BOTH HELD
                                      POSITION WITH                    OR             STOCK TO       DIRECTLY OR
           NAME                         COLLAGENEX                INDIRECTLY)(1)     BE OFFERED     INIDIRECTLY(2)
- ----------------------------        --------------------         ---------------     ------------   --------------
<S>                                 <C>                          <C>                    <C>           <C>
Brian M. Gallagher                  President, Chief             425,000/4.8%(3)        35,000        390,000/4.4%
                                      Executive Officer
                                      and Director

Robert A. Ashley                    Senior Vice President,       160,100/1.8%(4)        15,000        145,100/1.7%
                                      Commercial
                                      Development

Nancy C. Broadbent                  Chief Financial              136,000/1.6%(5)        15,000        121,000/1.4%
                                      Officer, Treasurer &
                                      Secretary

Douglas C. Gehrig                   Vice President, Sales        106,500/1.2%(6)        40,000         66,500/*

David F. Pfeiffer                   Vice President,              106,000/1.2%(7)        40,000         66,000/*
                                      Marketing

Helmer P.K. Agersborg, Ph.D.        Director                     136,209/1.6%(8)        25,000        111,209/1.3%

Peter Barnett                       Director                      27,000/*(9)           25,000          2,000/*

Robert C. Black                     Director                      25,000(10)            25,000              0/*

James E. Daverman                   Director                   1,053,289/12.1%(11)      25,000      1,028,311/11.8%

Robert J. Easton                    Director                      82,585/*(12)          25,000         57,589/*

Stephen A. Kaplan                   Director                   1,652,950(13)            25,000      1,627,950/*

Stephen W. Ritterbush, Ph.D.        Director                     471,517/5.5%(14)       25,000        446,517/5.2%

Pieter J. Schiller                  Former Director              415,299/4.8%(15)       25,000        390,299/4.5%

Terence W. Winters, Ph.D.           Director                     994,328/11.5%(16)      25,000       969,328/11.3%

Mary Granados                       Director, Professional        29,500/*(17)           5,625         23,875/*
                                      Relations and Dental
                                      Affairs

David Rustum                        Associate Marketing           12,000/*(18)           1,500         10,500/*
                                      Director
</TABLE>
- ----------

*     Less than one-percent.



                                     - 15 -
<PAGE>


(1)   Applicable  percentage of ownership is based on 8,612,891 shares of Common
      Stock outstanding as of August 31, 1999, plus any Common Stock equivalents
      or convertible  securities held and shares beneficially owned by each such
      holder 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)   Includes  300,000 vested and unvested options to purchase shares of Common
      Stock prior to this Offering.

(4)   Includes  131,875 vested and unvested options to purchase shares of Common
      Stock prior to this Offering.

(5)   Includes  111,000 vested and unvested options to purchase shares of Common
      Stock prior to this  Offering.  Also includes 1,000 shares of Common Stock
      held as custodian to minor child.

(6)   Includes  105,000 vested and unvested options to purchase shares of Common
      Stock prior to this Offering.

(7)   Includes  105,000 vested and unvested options to purchase shares of Common
      Stock prior to this Offering.

(8)   Includes  47,500 vested and unvested  options to purchase shares of Common
      Stock prior to this Offering.

(9)   Includes  25,000 vested and unvested  options to purchase shares of Common
      Stock prior to this Offering.

(10)  Includes 25,000 unvested  options to purchase shares of Common Stock prior
      to this Offering.

(11)  Includes  25,000 vested and unvested  options to purchase shares of Common
      Stock prior to this Offering and 20,000 shares of Common Stock held by Mr.
      Daverman. Mr. Daverman 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 Series D Cumulative Convertible Preferred Stock (the "Preferred Stock")
      held by  Marquette,  1,036  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, 30 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)  Includes  25,000 vested and unvested  options to purchase shares of Common
      Stock prior to this Offering.  Also includes 18,182 shares of Common Stock
      issuable upon the  conversion  of 2,000 shares of Preferred  Stock held by
      Mr.  Easton and 214 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 32,789 shares of
      Common Stock otherwise held by Mr. Easton.



                                     - 16 -
<PAGE>


(13)  Includes  25,000  unvested  options (the  "Options") to purchase shares of
      Common Stock prior to this Offering.  Mr. Kaplan is a Principal of Oaktree
      Capital Management,  LLC ("Oaktree"),  which is the general partner of OCM
      Principal Opportunities Fund, L.P. ("OCM"). Also includes 1,609,091 shares
      of  Common  Stock  issuable  upon the  conversion  of  177,000  shares  of
      Preferred  Stock held by OCM and 18,859  shares of Common  Stock issued in
      payment  of  dividends  on such  Preferred  Stock.  Mr.  Kaplan  expressly
      disclaims beneficial ownership of the shares of Preferred Stock and Common
      Stock held by OCM and, based upon certain  contractual  arrangements  with
      Oaktree  with respect to the  disposition  and control of the Common Stock
      underlying the Options, the shares of Common Stock underlying the Options,
      except to the extent of any indirect pecuniary interest therein.

(14)  Includes  25,000 vested and unvested  options to purchase shares of Common
      Stock  prior to this  Offering.  Dr.  Ritterbush  is a general  partner of
      Fairfax  Partners/The  Venture Fund of Washington,  L.P. 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 Fairfax  Partners/The  Venture Fund of
      Washington,   L.P.  (446,517  shares  of  Common  Stock).  Dr.  Ritterbush
      expressly disclaims beneficial ownership of such shares,  except as to his
      proportionate interest in Fairfax Partners/The Venture Fund of Washington,
      L.P.

(15)  Includes  25,000 vested and unvested  options to purchase shares of Common
      Stock prior to this  Offering.  Mr.  Schiller  resigned from the Company's
      Board of  Directors  effective  July 12, 1999.  Mr.  Schiller is a general
      partner of Advanced  Technology  Ventures III, L.P. 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 Advanced  Technology Ventures III, L.P.
      (390,299  shares  of  Common  Stock).  Mr.  Schiller  expressly  disclaims
      beneficial  ownership  of  such  shares,  except  as to his  proportionate
      interest in Advanced Technology Ventures III, L.P.

(16)  Includes  25,000 vested and unvested  options to purchase shares of Common
      Stock  prior  to this  Offering.  Dr.  Winters  is a  general  partner  of
      Columbine  Venture  Fund II, L.P.  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 Columbine  Venture Fund II, L.P. (969,328 shares of Common
      Stock).  Dr.  Winters  expressly  disclaims  beneficial  ownership of such
      shares, except as to his proportionate  interest in Columbine Venture Fund
      II, L.P.

(17)  Includes  23,875 vested and unvested  options to purchase shares of Common
      Stock prior to this Offering.

(18)  Includes  8,000 vested and unvested  options to purchase  shares of Common
      Stock prior to this Offering.



                                     - 17 -
<PAGE>


                              PLAN OF DISTRIBUTION

      The Selling  Shareholders have not advised CollaGenex of any specific plan
for the sale or distribution of the Shares.  If and when they occur,  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.

      When 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.



                                     - 18 -
<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 CollaGenex by Buchanan Ingersoll Professional Corporation,  500 College
Road East, Princeton, New Jersey 08540.

                                     EXPERTS

      The   consolidated   financial   statements  and  schedule  of  CollaGenex
Pharmaceuticals,  Inc.  as of December  31,  1998 and 1997,  and for each of the
years in the three-year  period ended December 31, 1998, 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, 1998 filed with the SEC on March 29, 1999;

            o     All other  reports  filed by  CollaGenex  pursuant  to Section
                  13(a) or 15(d) of the  Exchange  Act since  December 31, 1998;
                  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,



                                     - 19 -
<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-8
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.



                                     - 20 -
<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.



                                     - 21 -
<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 or persons  controlling  CollaGenex
pursuant to the foregoing provisions, or otherwise, CollaGenex has been informed
that in the opinion of the SEC such  indemnification is against public policy as
expressed in the Securities Act and is therefore unenforceable.



                                     - 22 -
<PAGE>


                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

      The contents of the Company's Registration Statement on Form S-8 (Reg. No.
333-31229)  filed  with the SEC on July  14,  1997 are  incorporated  herein  by
reference.


ITEM 7.    EXEMPTION FROM REGISTRATION CLAIMED.

      The  issuance  of the  Shares  being  offered  by  the  Form  S-3  reoffer
Prospectus  were deemed exempt from  registration  under the  Securities  Act in
reliance upon either  Section 4(2) of the  Securities  Act as  transactions  not
involving  any  public  offering  or  Rule  701  under  the  Securities  Act  as
transactions  made  pursuant  to a written  compensatory  plan or  pursuant to a
written contract relating to compensation.

ITEM 8.    EXHIBITS.

  Exhibit Number                            Description
  --------------      ----------------------------------------------------------

       5.1            Opinion of Buchanan Ingersoll Professional Corporation.

      23.1            Consent of KPMG LLP.

      23.2            Consent of Buchanan Ingersoll Professional Corporation
                      (contained in the opinion filed as Exhibit 5.1).

      24              Power of  Attorney  (contained  on the  signature  page of
                      this Registration Statement).

ITEM 9.    UNDERTAKINGS.

      a.    CollaGenex hereby undertakes:

            (1) To file,  during any  period in which  offers or sales are being
      made, a post-effective amendment to this registration statement:

            (i)   To include any prospectus  required by Section 10(a)(3) of the
                  Securities Act;

            (ii)  To reflect in the prospectus any facts or events arising after
                  the effective date of this registration statement (or the most
                  recent post-effective  amendment thereof) which,  individually
                  or in the  aggregate,  represent a  fundamental  change in the
                  information set forth in the registration statement; and



                                     II-1
<PAGE>

            (iii) 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;

      provided,  however,  that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
      if the information  required to be included in a post-effective  amendment
      by those  paragraphs  is  contained  in  periodic  reports  filed  with or
      furnished to the SEC by CollaGenex pursuant to Section 13 or Section 15(d)
      of  the  Exchange  Act  that  are   incorporated   by  reference  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 Section 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 this 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 SEC 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,  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-2
<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-8 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 8th day of
October, 1999.

                                    COLLAGENEX PHARMACEUTICALS, INC.



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



<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, true and lawful  attorneys-in-fact and agents with
full power of substitution and  resubstitution,  for him and in his or her 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 SEC, 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 or she  might or could do in  person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or their 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    October 8, 1999
- -------------------------------    Officer and Director
Brian M. Gallagher, Ph.D.          (Principal Executive Officer)


/s/ Nancy C. Broadbent             Chief Financial Officer,      October 8, 1999
- -------------------------------    Treasurer and Secretary
Nancy C. Broadbent                 (Principal Financial and
                                   Accounting Officer)


/s/ Helmer P.K. Agersborg, Ph.D.   Chairman of the Board and     October 8, 1999
- --------------------------------   Director
Helmer P.K. Agersborg, Ph.D.


/s/ Peter Barnett                  Director                      October 8, 1999
- --------------------------------
Peter Barnett


/s/ Robert C. Black                Director                      October 8, 1999
- --------------------------------
Robert C. Black


/s/ James E. Daverman              Director                      October 8, 1999
- --------------------------------
James E. Daverman


/s/ Robert J. Easton               Director                      October 8, 1999
- --------------------------------
Robert J. Easton


/s/ Stephen A. Kaplan              Director                      October 8, 1999
- --------------------------------
Stephen A. Kaplan


/s/ Stephen W. Ritterbush, Ph.D.   Director                      October 8, 1999
- --------------------------------
Stephen W. Ritterbush, Ph.D.


/s/ Terence E. Winters, Ph.D.      Director                      October 8, 1999
- --------------------------------
Terence E. Winters, Ph.D.



<PAGE>



                                  EXHIBIT INDEX


  Exhibit Number                            Description
  --------------      ----------------------------------------------------------

       5.1            Opinion of Buchanan Ingersoll Professional Corporation.

      23.1            Consent of KPMG LLP.

      23.2            Consent of Buchanan Ingersoll Professional Corporation
                      (contained in the opinion filed as Exhibit 5.1).

      24              Power of  Attorney  (contained  on the  signature  page of
                      this Registration Statement).






                                        EXHIBIT 5.1

                   Opinion of Buchanan Ingersoll Professional Corporation



<PAGE>



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

                                  October 8, 1999

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 its
Post-Effective Amendment No. 1 on Form S-8 (the "Registration Statement"), under
the  Securities  Act of 1933,  as amended,  relating to the  registration  of an
aggregate of 1,138,500 shares (the "Shares") of the Company's common stock, $.01
par value,  of which:  (i) 200,000 are issuable  pursuant to options  previously
granted by the Company to its  non-employee  directors  under the Company's 1996
Non-Employee  Director Stock Option Plan, as amended (the "Director Plan"); (ii)
750,000  are  issuable  pursuant  to options to be granted by the Company to its
employees, non-employee directors and consultants under the Company's 1996 Stock
Plan (the  "Stock  Plan");  (iii)  170,000  are  issuable  pursuant  to  options
previously granted by the Company under the Stock Plan; (iv) 11,375 are issuable
pursuant to options  previously granted by the Company to its employees pursuant
to  certain  written  agreements  dated May  1996,  June  1996 or  January  1999
(collectively,  the  "Agreements");  and (v) 7,125 Shares (the "Issued  Shares")
have been issued  pursuant to options  previously  granted by the Company to its
employees under certain of the Agreements. The Director Plan, the Stock Plan and
the Agreements are referred to collectively herein as the "Plans."

      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 has been duly and validly authorized;

2.    The  Issued  Shares  have  been  legally  issued  and are  fully  paid and
      non-assessable shares of the Company's Common Stock; and

3.    The  Shares  underlying  the Plans,  when  issued,  delivered  and sold in
      accordance with the terms of the respective Plan and the stock options, or
      other  instruments  authorized  by such  Plans,  granted  or to be granted
      thereunder, will be legally issued, fully paid and non-assessable.

      We hereby  consent  to the  filing  of this  opinion  as  Exhibit 5 to the
Registration Statement.

                                  Very truly yours,
                                  /s/BUCHANAN INGERSOLL PROFESSIONAL CORPORATION

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





                                  EXHIBIT 23.1

                                    Consent of KPMG LLP


<PAGE>


                                                                    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
                                                                    ------------
                                                                        KPMG LLP


Princeton, New Jersey
October 7, 1999






                                        EXHIBIT 23.2

                   Consent of Buchanan Ingersoll Professional Corporation
                      (contained in the opinion filed as Exhibit 5.1)






                                         EXHIBIT 24

                                     Power of Attorney
              (contained on the signature page of this Registration Statement)




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