COLLAGENEX PHARMACEUTICALS INC
424B2, 2000-08-22
PHARMACEUTICAL PREPARATIONS
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                                                      Filed   pursuant  to  Rule
                                                      424(b)(2)     under    the
                                                      Securities Act of 1933, as
                                                      amended      (Registration
                                                      Statement No. 333-35634)

PROSPECTUS


                                 131,760 Shares

                        COLLAGENEX PHARMACEUTICALS, INC.

                                  Common Stock

      This  prospectus  relates to the public  resale,  from time to time, of an
aggregate  of 131,760  shares of our common  stock,  $.01 par value,  by certain
stockholders   identified   below  in  the   section   entitled   "The   Selling
Shareholders."

      We will not  receive  any of the  proceeds  from  the sale by the  selling
shareholders of the shares covered by this prospectus.

      Our common stock is traded on the Nasdaq  National Market under the symbol
"CGPI." On July 27,  2000,  the  closing  sale price of our common  stock on the
Nasdaq National Market was $9.875 per share.

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

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

                                 August 22, 2000


<PAGE>


                          PROSPECTUS TABLE OF CONTENTS

                                                                            Page
                                                                            ----

CollaGenex Pharmaceuticals, Inc...........................................   2
Risk Factors..............................................................   3
     If Periostat is Not Adopted Routinely by Dental Professionals or
       if Managed Care Providers Do Not Continue to Reimburse
       Patients, Our Sales Growth Will Suffer.............................   3
     We Rely on Periostat for Most of Our Revenue.........................   3
     We Anticipate Future Losses..........................................   3
     We Have a Limited Marketing and Sales History and May Not be
       Able to Successfully Market Our Product Candidates.................   4
     Our Competitive Position in the Marketplace Depends on Enforcing
       and Successfully Defending Our Intellectual Property Rights........   4
     If We Lose Our Sole Supplier of Doxycycline or Our Current
       Manufacturer of Periostat, Our Commercialization of Periostat
       Will be Interrupted or Less Profitable.............................   5
     We Are Subject to Extensive Government Regulations...................   5
     If Our Products Cause Injuries, We May Incur Significant Expense
       and Liability......................................................   6
     If We Need Additional Financing, and Financing is Unavailable,
       Our Ability to Develop and Commercialize Products and Our
       Operations Will be Adversely Affected..............................   6
     Delaware Law, Our Certificate of Incorporation and Our By-Laws
       Contain Provisions That Could Discourage a Takeover of Our
       Company............................................................   6
     Because Our Executive Officers, Directors and Affiliated
       Entities Own Approximately 42% of Our Capital Stock, They
       Could Control Our Actions in a Manner That Conflicts With Our
       Interests and the Interests of Our Other Stockholders..............   7
     Our Stock Price is Highly Volatile, and Therefore the Value of
       Your Investment May Fluctuate Significantly........................   7
Special Note Regarding Forward-Looking Information........................   7
Use of Proceeds...........................................................   8
Selling Shareholders......................................................   8
Plan of Distribution......................................................  11
Legal Matters.............................................................  12
Experts...................................................................  12
Information Incorporated by Reference.....................................  12
Where You Can Find More Information.......................................  13
Indemnification of Directors and Officers.................................  14


<PAGE>


                        COLLAGENEX PHARMACEUTICALS, INC.


      CollaGenex  Pharmaceuticals,  Inc.  and its  subsidiaries  is a  specialty
pharmaceutical  company focused on providing innovative medical therapies to the
dental market. In September 1998, the FDA approved our first product, Periostat,
a   prescription   pharmaceutical   capsule   to  treat   adult   periodontitis.
Periodontitis, the leading cause of tooth loss, is a disease of the gums that is
initiated by the  accumulation of bacterial plaque above and below the gum line.
The FDA approved Periostat as an adjunct to scaling and root planing, which is a
mechanical  procedure  that  dentists  use to remove  bacterial  plaque.  We are
marketing  Periostat to the dental  community  through our  professional  dental
pharmaceutical  sales  force of  approximately  135  sales  representatives  and
managers. This sales force also co-promotes Vioxx, a prescription  non-steroidal
anti-inflammatory   drug  developed  by  Merck  &  Co.,  Inc.,  and  Denavir,  a
prescription  cold sore  medication  developed by  SmithKline  Beecham  Consumer
Healthcare,  L.P. We are 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," "we," "us" and "our" includes
CollaGenex Pharmaceuticals, Inc. and its subsidiaries.



                                      -2-

<PAGE>


                                  RISK FACTORS

      IF  PERIOSTAT  IS NOT  ADOPTED  ROUTINELY  BY DENTAL  PROFESSIONALS  OR IF
MANAGED CARE PROVIDERS DO NOT CONTINUE TO REIMBURSE  PATIENTS,  OUR SALES GROWTH
WILL SUFFER.

      Our growth and success depends in large part on our ability to continue to
demonstrate the safety and  effectiveness  of Periostat for the treatment of gum
disease  to  dental  practitioners.  Periostat  is the first  long-term  medical
therapy for any dental  disease,  and dentists are not accustomed to prescribing
drugs for a minimum 90-day  duration.  Periostat  works by  suppressing  certain
enzymes involved in the periodontal disease process,  which is a new concept for
many  dentists who believe  that  removing  bacterial  plaque is the only way to
treat this  disease.  Accordingly,  our sales  efforts  are  largely  focused on
educating  dental  professionals  about an  entirely  new  approach  to treating
periodontitis. Although nearly 30,000 dentists in the U.S. have written at least
one prescription for Periostat,  a number of dentists have not adopted Periostat
routinely  into their  treatment of adult  periodontitis.  Other  dentists  have
prescribed  Periostat for only a subset of their  eligible  patients,  typically
their most advanced or  refractory  cases.  If we are unable to initiate  and/or
expand usage of Periostat by dentists, our sales growth will suffer.

      Approximately 65% of the large managed care providers in the U.S. (defined
as those  that  cover  100,000  or more  lives)  reimburse  their  patients  for
Periostat,  typically  requiring  a modest  co-payment.  Our goal is to  achieve
reimbursement from approximately 75% of the large managed care providers,  since
the  remainder  have  policies  that do not  reimburse for drugs to treat dental
conditions.  Patients who are not  reimbursed by managed care  providers may not
accept  Periostat  as a  treatment.  In  addition,  we  have  not  yet  achieved
reimbursement from most of the large managed care providers in California,  thus
limiting prescription and sales growth in that state.

      WE RELY ON PERIOSTAT FOR MOST OF OUR REVENUE.

      During 1999, Periostat accounted for 95% of our total net revenues. During
the  second  quarter  of 2000,  Periostat  accounted  for 85% of our  total  net
revenues.  Although we currently  derive  revenues from  co-promoting  two other
products and from licensing fees from foreign  marketing  partners,  our revenue
and  profitability in the near future will depend on our ability to successfully
market and sell Periostat.

      WE ANTICIPATE FUTURE 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.  For the
quarter ended March 31, 2000, we  experienced a net loss of  approximately  $2.4
million.  During the year ended  December 31, 1999, we experienced a net loss of
approximately  $14.6 million.  From inception through December 31, 1999, we have
experienced an aggregate net loss of $52.5 million.  Our historical  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
expect to incur  significant  future expenses,  particularly with respect to the
sales and marketing of Periostat.  As a result,  we anticipate losses through at
least year-end 2000.



                                      -3-

<PAGE>


      WE HAVE A  LIMITED  MARKETING  AND  SALES  HISTORY  AND MAY NOT BE ABLE TO
SUCCESSFULLY MARKET OUR PRODUCT CANDIDATES.

      We  have  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  necessary  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. If we
are unable to continue to recruit and retain sales and marketing  personnel,  we
will  be  unable  to  successfully  expand  our  sales  and  marketing  efforts.
Furthermore,  if our foreign  partners  do not devote  sufficient  resources  to
perform their  contractual  obligations  with us, we may not achieve our foreign
sales goals.

      OUR  COMPETITIVE  POSITION IN THE  MARKETPLACE  DEPENDS ON  ENFORCING  AND
SUCCESSFULLY DEFENDING OUR INTELLECTUAL PROPERTY RIGHTS.

      In order to be competitive in the pharmaceutical industry, it is important
to  establish,   enforce,  and  successfully  defend  patent  and  trade  secret
protection  for  our  established  and new  technologies.  We  must  also  avoid
liability from infringing the proprietary rights of others.

      Our core technology is licensed from The Research  Foundation of the State
University of New York ("SUNY"),  and other  academic and research  institutions
collaborating  with SUNY  (hereinafter  referred  to  collectively  as the "SUNY
License").  Under the SUNY  License we have an  exclusive  worldwide  license to
SUNY's  rights in  certain  patents  and  patent  applications  to make and sell
products employing  tetracyclines to treat certain disease conditions.  The SUNY
License imposes various payment and reporting  obligations on us and our failure
to comply with these requirements permits SUNY to terminate the SUNY License. If
the SUNY License is terminated,  we would lose our right to exclude  competitors
from commercializing  similar products,  and we could be excluded from marketing
the same  products if SUNY  licensed the  underlying  technology to a competitor
after terminating the SUNY License.

      SUNY owns twenty-four U.S. patents and eight U.S. patent applications that
are licensed to us. The patents licensed from SUNY expire between 2004 and 2018.
Two of the  patents  are  related  to  Periostat  and  expire  in 2004 and 2007.
Technology  covered by these patents  becomes  available to  competitors  as the
patents expire.

      Since many of our patent rights cover new treatments using  tetracyclines,
which are  generally  available  for their known use as  antibiotics,  we may be
required  to bring  expensive  infringement  actions to enforce  our patents and
protect  our  technology.  Although  federal  law  prohibits  making and selling
pharmaceuticals for infringing use, competitors and/or practitioners may provide
generic  forms of  tetracycline  for  treatment(s)  which  infringe our patents,
rather than  prescribe  our  Periostat  product.  Enforcement  of patents can be
expensive and time consuming.



                                      -4-

<PAGE>


      Our success also depends upon know-how,  unpatentable  trade secrets,  and
the skills,  knowledge and experience of our scientific and technical personnel.
To that end, we require all of our employees  and, to the extent  possible,  all
consultants,  advisors and research collaborators, to enter into confidentiality
agreements  prohibiting  unauthorized  disclosure  and  requiring  assignment of
rights to their ideas, developments, discoveries and inventions. With respect to
information and chemical  compounds we provide for testing to  collaborators  in
academic institutions, we cannot guarantee that the institutions will not assert
property  rights  in the  results  of  such  tests  nor  that a  license  can be
reasonably obtained from such institutions which assert such rights.  Failure to
obtain the  benefit  of such  testing  could  adversely  affect  our  commercial
position and, consequently, our financial condition.

      IF WE LOSE OUR SOLE SUPPLIER OF DOXYCYCLINE OR OUR CURRENT MANUFACTURER OF
PERIOSTAT,  OUR  COMMERCIALIZATION  OF  PERIOSTAT  WILL BE  INTERRUPTED  OR LESS
PROFITABLE.

      We rely on a single  supplier 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.  If we are unable to procure a commercial  quantity of doxycycline  from
our current supplier on an ongoing basis at a competitive price, or if we cannot
find a replacement  supplier in a timely manner or with favorable pricing terms,
our costs may increase  significantly and we may experience delays in the supply
of Periostat.

      We  rely  on  a  single  third-party  contract   manufacturer  to  produce
Periostat.  We are currently  working with another  contract  manufacturer  on a
tablet  formulation  for  Periostat  and we intend to contract  with  additional
manufacturers  for the  commercial  manufacture  of  Periostat.  An inability to
maintain our arrangements with our present  manufacturer  could result in delays
in the supply of  Periostat  and we believe that it could take up to one year to
successfully transition to a new manufacturer.

      WE ARE SUBJECT TO EXTENSIVE GOVERNMENT REGULATIONS.

      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.

      Both  before and after  approval is  obtained,  violations  of  regulatory
requirements  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.

      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



                                      -5-

<PAGE>


product in those countries. The approval process varies from country to country,
and other countries may also impose post-approval requirements.

      IF OUR PRODUCTS CAUSE  INJURIES,  WE MAY INCUR  SIGNIFICANT  EXPENSE AND
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 level of insurance may not adequately
protect us against product liability claims.  Insufficient insurance coverage or
the failure to obtain  indemnification  from third parties for their  respective
liabilities may expose us to product  liability  claims and/or recalls and could
cause our business, financial condition and results of operations to decline.

      IF WE NEED ADDITIONAL FINANCING, AND FINANCING IS UNAVAILABLE, OUR ABILITY
TO DEVELOP AND  COMMERCIALIZE  PRODUCTS  AND OUR  OPERATIONS  WILL BE  ADVERSELY
AFFECTED.

      We have  historically  financed our operations  through public 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 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.
At March 31, 2000 we had cash, cash  equivalents  and short-term  investments of
approximately  $12.1 million and we anticipate that our existing working capital
will be sufficient to fund our operations through the year-end 2000.

      DELAWARE LAW, OUR  CERTIFICATE OF  INCORPORATION  AND OUR BY-LAWS  CONTAIN
PROVISIONS THAT COULD DISCOURAGE A TAKEOVER OF OUR COMPANY.

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



                                      -6-

<PAGE>


      BECAUSE OUR  EXECUTIVE  OFFICERS,  DIRECTORS AND  AFFILIATED  ENTITIES OWN
APPROXIMATELY  42% OF OUR  CAPITAL  STOCK,  THEY COULD  CONTROL OUR ACTIONS IN A
MANNER  THAT  CONFLICTS  WITH  OUR  INTERESTS  AND THE  INTERESTS  OF OUR  OTHER
STOCKHOLDERS.

      Currently,  our  executive  officers,  directors and  affiliated  entities
together  beneficially own  approximately  42% of the outstanding  shares of our
common stock or equity  securities  convertible  into common stock. As a result,
these  stockholders,   acting  together,   or  in  the  case  of  our  preferred
stockholders, in certain instances, as a class, will be able to exercise control
over corporate actions requiring stockholder approval, including the election of
directors.  This  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.

      OUR  STOCK  PRICE IS  HIGHLY  VOLATILE,  AND  THEREFORE  THE VALUE OF YOUR
INVESTMENT MAY FLUCTUATE SIGNIFICANTLY.

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



               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 in the section  entitled  "Risk  Factors."  In
particular,   CollaGenex's   business  of  selling,   marketing  and  developing
pharmaceutical  products is subject to a number of significant risks,  including
risks relating to the  implementation of CollaGenex's  sales and marketing plans
for Periostat(R),  risks inherent in research and development activities,  risks
associated  with  conducting  business  in a highly  regulated  environment  and
uncertainty   relating  to  clinical  trials  of  products  under   development.
CollaGenex's  success  depends to a large degree upon the market  acceptance  of
Periostat by periodontists,  dental practitioners,  other health care providers,
patients and insurance  companies.  In addition,  there can be no assurance that
CollaGenex's  product  candidates (other than the FDA's approval of Periostat in
the United States) will be approved by any regulatory authority for marketing in
any  jurisdiction  or, if  approved,  that any such  products or  Denavir(R)  or
Vioxx(R) will be successfully  commercialized by CollaGenex. As a result of such
risks and others  expressed from time to time in  CollaGenex's  filings with the
Securities  and  Exchange  Commission,  CollaGenex's  actual  results may differ
materially  from the  results  discussed  in or implied  by the  forward-looking
statements contained herein.



                                      -7-

<PAGE>


                                 USE OF PROCEEDS

      CollaGenex  will  not  receive  any of the  proceeds  from the sale of the
shares offered by the selling shareholders set forth in this prospectus.



                              SELLING SHAREHOLDERS

      The  individuals  and entities  listed below received  shares of preferred
stock in  connection  with the  execution  of a stock  purchase  agreement  with
CollaGenex,  dated  March  19,  1999.  The  preferred  stock  is  by  its  terms
convertible,  in certain circumstances,  into shares of common stock. Holders of
the preferred stock are also entitled to certain dividend payments to be made in
shares of common stock.  Under the terms of the stock  purchase  agreement,  all
such dividend  payments issued to the selling  shareholders are to be registered
with the  Securities  and Exchange  Commission.  The  registration  of shares of
common stock paid as dividends to the selling  shareholders for the periods July
1, 1999  through  December 31, 1999 and January 1, 2000 through June 30, 2000 is
included herein.

      The  following  table sets forth as of June 30, 2000  certain  information
with respect to the selling  shareholders.  CollaGenex cannot assure that any of
the  selling  shareholders  will offer for sale or sell any or all of the shares
offered by them pursuant to this prospectus.

<TABLE>
<CAPTION>
                                                                             Number of
                                                Beneficial Ownership of        Shares             Beneficial
                   Name of                        Selling Shareholders        Offered         Ownership of Shares
            Selling Shareholders                  Prior to Offering(1)       Hereby(2)         After Offering(2)
------------------------------------------      -----------------------      ---------        -------------------
                                                  Number        Percent                       Number       Percent
                                                  ------        -------                       ------       -------
<S>                                             <C>              <C>          <C>            <C>            <C>
OCM Principal Opportunities Fund, L.P.....      1,744,555(3)     16.9(3)      116,605        1,627,950      15.8
Richard A. Horstmann......................        712,165(4)      8.1(4)        6,589          705,576       8.0
Marquette Venture Partners II, L.P........        986,683(5)     11.2(5)        6,405          980,278      11.1
MVP II Affiliates Fund, L.P. .............         28,195(5)       *(5)           184           28,011       *
Robert J. Easton..........................         69,009(6)       *(6)         1,318           67,691       *
Pebblebrook Partners Ltd..................          9,857(7)       *(7)           659            9,198       *
</TABLE>
----------

*     Less than one percent

(1)   Such number of shares held includes  shares of common stock issued to each
      such holder in payment of dividends on the preferred stock declared by the
      CollaGenex's  Board of  Directors  in December  1999 and in June 2000 that
      were distributed in January 2000 and July 2000,  respectively.  Applicable
      percentage  of  ownership  is based on  8,678,904  shares of common  stock
      outstanding  as of June 30,  2000,  plus any common stock  equivalents  or
      convertible securities held, shares beneficially owned by each such holder
      and shares of common stock issued by CollaGenex in payment of dividends on
      the preferred stock.



                                      -8-

<PAGE>


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

(3)   Stephen A.  Kaplan,  a member of  CollaGenex's  Board of  Directors,  is a
      Principal of Oaktree Capital Management, LLC, which is the general partner
      of OCM Principal  Opportunities  Fund, L.P.  ("OCM").  Includes  1,609,091
      shares of common stock  issuable upon the  conversion of 177,000 shares of
      preferred  stock held by OCM and 135,464  shares of common stock issued in
      payment  of  dividends  on such  preferred  stock.  Mr.  Kaplan  expressly
      disclaims beneficial ownership of such shares, except to the extent of any
      indirect pecuniary interest therein.

(4)   Mr. Horstmann is a principal of Thomson  Horstmann & Bryant,  Inc. and, as
      such,  has the power to vote or to direct the vote of and to dispose of or
      direct the disposition of the shares owned by Thomson  Horstmann & Bryant,
      Inc. (613,600 shares of common stock). Mr. Horstmann  expressly  disclaims
      beneficial  ownership  of  such  shares,  except  as to his  proportionate
      interest in Thomson  Horstmann & Bryant,  Inc. Also includes 90,910 shares
      of common stock issuable upon the conversion of 10,000 shares of preferred
      stock held by Mr.  Horstmann  and 7,655  shares of common  stock issued in
      payment of dividends on such preferred stock.

(5)   James E.  Daverman,  a member  of  CollaGenex's  Board  of  Directors,  is
      President of Marquette  Management  Partners,  LLC, the general partner of
      Marquette Venture Partners, L.P. and a general partner of MG II, L.P., the
      general partner of Marquette  Venture Partners II, L.P.  ("Marquette") and
      MVP II Affiliates  Fund,  L.P.  ("MVP II") and, as such,  has the power to
      vote or direct the vote of and to dispose of or direct the  disposition of
      the shares  owned by Marquette  (which  includes  88,382  shares of common
      stock issuable upon the conversion of 9,722 shares of preferred stock held
      by Marquette,  7,441 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, 214 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.

(6)   Mr. Easton is a member of CollaGenex's Board of Directors. Includes 17,000
      shares of common stock underlying options which are exercisable as of June
      30, 2000 or 60 days after such date. Also includes 18,182 shares of common
      stock issuable upon the conversion of 2,000 shares preferred stock held by
      Mr. Easton and 1,532 shares of common stock issued in payment of dividends
      on such preferred  stock.  Also includes 6,400 shares of common stock held
      as trustee for Second Easton Family  Charitable Trust and 25,895 shares of
      common stock otherwise held by Mr. Easton.



                                      -9-

<PAGE>


(7)   Includes  9,091 shares of common stock  issuable  upon the  conversion  of
      1,000 shares of preferred stock held by Pebblebrook  Partners Ltd. and 766
      shares of common stock  issued in payment of  dividends on such  preferred
      stock.

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



                                      -10-

<PAGE>


                              PLAN OF DISTRIBUTION

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

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

      o     In public or privately negotiated transactions;

      o     In transactions involving principals or brokers;

      o     In a combination of such methods of sale; or

      o     Any other lawful methods.

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

      In offering  the shares  covered by this  prospectus,  each of the selling
shareholders  and any  broker-dealers  who  sell  the  shares  for  the  selling
shareholders may be  "underwriters"  within the meaning of the Securities Act of
1933, 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.



                                      -11-

<PAGE>


      The  expenses  of  preparing  and filing this  prospectus  and the related
registration  statement with the Securities and Exchange Commission 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 of 1933,
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,  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,  650 College
Road East, Princeton, New Jersey 08540.


                                     EXPERTS

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


                      INFORMATION INCORPORATED BY REFERENCE

      The Securities and Exchange  Commission  allows CollaGenex to "incorporate
by reference" the information  CollaGenex files with the Securities and Exchange
Commission,  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  Securities  and  Exchange  Commission  will
automatically update and supersede this information.  CollaGenex incorporates by
reference the documents  listed below and any future  filings made by CollaGenex
with the Securities and Exchange  Commission under Sections 13(a),  13(c), 14 or
15(d)  of  the  Exchange  Act  of  1934,  as  amended,  until  the  filing  of a
post-effective  amendment to this prospectus which indicates that all securities
registered  have been sold or which  deregisters  all securities  then remaining
unsold:

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

      o     All other reports  filed by CollaGenex  pursuant to Section 13(a) or
            15(d) of the Exchange Act of 1934,  as amended,  since  December 31,
            1999; and

      o     The description of CollaGenex's  common stock, $.01 par value, which
            is  contained  in  CollaGenex's  Registration  Statement on Form 8-A
            filed  pursuant to Section  12(g)


                                      -12-

<PAGE>


            of the  Exchange  Act of 1934,  as  amended,  in the  form  declared
            effective  by the  Securities  and Exchange  Commission  on June 20,
            1996,  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 Securities and Exchange Commission.  CollaGenex's
Securities and Exchange  Commission filings are available to the public over the
Internet   at   the   Securities   and   Exchange    Commission's   website   at
http://www.sec.gov.  You may also  read  and  copy,  at  prescribed  rates,  any
document  CollaGenex  files with the Securities  and Exchange  Commission at the
Securities and Exchange  Commission's Public Reference Room at 450 Fifth Street,
N.W.,  Washington,  D.C. 20549 and at the regional offices of the Securities and
Exchange Commission 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  Securities  and Exchange  Commission  at
1-800-SEC-0330   for  further   information   on  the  Securities  and  Exchange
Commission's Public Reference Room.

      CollaGenex  has  filed  with the  Securities  and  Exchange  Commission  a
Registration Statement on Form S-3 under the Securities Act of 1933 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 Securities and Exchange  Commission.  The registration  statement and any of
its amendments, including exhibits filed as a




                                      -13-

<PAGE>


part  of  the  registration  statement  or  an  amendment  to  the  registration
statement, are available for inspection and copying as described above.



                    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



                                      -14-

<PAGE>


such whether or not the corporation would have the power to indemnify him or her
against such liabilities under Section 145.

      Article  IX  of  CollaGenex's  By-laws  specifies  that  CollaGenex  shall
indemnify its directors, officers, employees and agents because he or she was or
is a  director,  officer,  employee  or  agent of the  Corporation  or was or is
serving at the request of the  Corporation as a director,  officer,  employee or
agent of  another  entity to the full  extent  that such right of  indemnity  is
permitted by the laws of the State of Delaware. This provision of the By-laws is
deemed to be a contract  between  CollaGenex  and each  director and officer who
serves in such  capacity  at any time  while  such  provision  and the  relevant
provisions of the Delaware General Corporation Law are in effect, and any repeal
or  modification  thereof  shall  not  offset  any  action,  suit or  proceeding
theretofore or thereafter  brought or threatened  based in whole or in part upon
any such state of facts.  The affirmative vote of the holders of at least 80% of
the voting power of all  outstanding  shares of the capital stock of CollaGenex,
and, in certain  circumstances,  66 2/3% of the voting power of all  outstanding
shares of the Series D cumulative convertible preferred stock of CollaGenex,  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  CollaGenex,  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 of 1933 may be permitted to directors,  officers, and controlling persons of
CollaGenex pursuant to the foregoing  provisions,  or otherwise,  CollaGenex has
been advised that in the opinion of the Securities and Exchange  Commission such
indemnification  is against  public policy as expressed in the Securities Act of
1933 and is, therefore, unenforceable.


                                      -15-



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