COLLAGENEX PHARMACEUTICALS INC
S-3/A, 2000-06-28
PHARMACEUTICAL PREPARATIONS
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      As Filed with the Securities and Exchange Commission on June 28, 2000
                                                     Registration No. 333-35634
===============================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                         -----------------------------
                               AMENDMENT NO. 1 TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                       CollaGenex Pharmaceuticals, Inc.
                  -------------------------------------------
             (Exact Name of Registrant as Specified in Its Charter)
         Delaware                                              52-1758016
----------------------------                             ----------------------
      (State or Other                                       (I.R.S. Employer
       Jurisdiction                                      Identification Number)
    of Incorporation or
       Organization)
                               41 University Drive
                           Newtown, Pennsylvania 18940
                                 (215) 579-7388
            --------------------------------------------------------
               (Address, Including Zip Code, and Telephone Number,
                                    Including
             Area Code, of Registrant's Principal Executive Offices)

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

                                    Copy to:
                              David J. Sorin, Esq.
                              Tod K. Reichert, Esq.
                   Buchanan Ingersoll Professional Corporation
                                 College Centre
                              650 College Road East
                           Princeton, New Jersey 08540
                                   (609) 987-6800
                          ---------------------------
      Approximate date of commencement of proposed sale to the public: From time
to time after this Registration Statement becomes effective.
                          ---------------------------

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


<PAGE>





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

                        CALCULATION OF REGISTRATION FEE
===============================================================================


                                    Proposed        Proposed
                       Amount        Maximum         Maximum        Amount Of
  Title of Shares      To Be     Aggregate Price    Aggregate     Registration
 To Be Registered    Registered   Per Share(1)   Offering Price      Fee(2)
-------------------------------------------------------------------------------


Common Stock,
 $.01 par value..      39,188        $9.7187       $380,858.37       $100.55

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


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

(2)  The Registrant previously paid such fee on April 26, 2000.

     The Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further  amendment  which  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the  Securities  Act of 1933 or until the  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.



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


<PAGE>

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


PROSPECTUS (Not Complete)
Dated:  June 28, 2000


                                  39,188 Shares

                              COLLAGENEX PHARMACEUTICALS, INC.

                                  Common Stock

      This  prospectus  relates to the public  resale,  from time to time, of an
aggregate  of 39,188  shares 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 April 20,  2000,  the closing  sale price of our common  stock on the
Nasdaq National Market was $9.7187 per share.


          Investing in the common stock involves a high degree of risk.
                     See "Risk Factors" beginning on page 3.

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

                                 June 28, 2000.




<PAGE>





                          PROSPECTUS TABLE OF CONTENTS

                                                                            Page
CollaGenex Pharmaceuticals, Inc.......................................       2
Risk Factors..........................................................       3
     If Periostat is Not Accepted by Dental Health Care Providers and
       Patients, Our Sales 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.............       3
     If Our Intellectual Property Rights Are Compromised, We May Not
       Be Able to Compete Effectively.................................       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.........................       6
     A Reduction in Third-Party Reimbursements May Negatively Affect
       the Sale of Our Products.......................................       6
     If We Cannot Compete Effectively, Our Sales Will Decline.........       6
     We May be Unable to Successfully Commercialize New Products......       7
     We Are Subject to Extensive Government Regulations...............       7
     If Our Products Cause Injuries, We May Incur Significant Expense
       and Liability..................................................       7
     If We Need Additional Financing, and Financing is Unavailable,
       Our Ability to Develop and Commercialize Products and Our
       Operations Will be Adversely Affected..........................       8
     Delaware Law, Our Certificate of Incorporation and Our By-Laws
       Contain Provisions That Could Discourage a Takeover of Our
       Company........................................................       8
     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..........       8
     Our Stock Price is Highly Volatile, and Therefore the Value of
       Your Investment May Fluctuate Significantly....................       8
Special Note Regarding Forward-Looking Information....................       9
Use of Proceeds.......................................................       9
Selling Shareholders..................................................       9
Plan of Distribution..................................................      12
Legal Matters.........................................................      13
Experts...............................................................      13
Information Incorporated by Reference.................................      13
Where You Can Find More Information...................................      14
Indemnification of Directors and Officers.............................      15



<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  developed as an adjunct to scaling and
root   planing,    a   mechanical    procedure    involving   the   removal   of
bacteria-containing  plaque,  to promote gum and tooth  attachment and to reduce
gum pocket  depth in  patients  with adult  periodontitis,  a chronic  infection
caused by plaque build up on teeth and the leading cause of adult tooth loss. 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 Accepted by Dental Health Care Providers and Patients,
Our Sales Will Suffer.  In September  1998,  the FDA approved our first product,
Periostat,  a  prescription  pharmaceutical  capsule  developed as an adjunct to
scaling  and root  planing,  a  mechanical  procedure  involving  the removal of
bacteria-containing  plaque,  to promote gum and tooth  attachment and to reduce
gum pocket  depth in  patients  with adult  periodontitis,  a chronic  infection
caused by plaque  build up on teeth and the  leading  cause of adult tooth loss.
Our growth and success  depends in large part on our ability to  demonstrate  to
dental  practitioners  the  effectiveness  of Periostat for the treatment of gum
disease. Further, our growth and success will depend on acceptance and continued
use of Periostat by dental health care  providers and patients.  If Periostat is
rejected by dental health care  providers or patients for any reason,  our sales
will suffer.

      We  Rely  on  Periostat   for  Most  of  Our  Revenue.   Our  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 in the  immediate
future will come from sales of Periostat.  If we fail to successfully market and
sell Periostat on a consistent  basis, we will be forced to identify and finance
alternative products to generate sufficient operating revenue.

      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.

      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.
                                      -3-
<PAGE>


      If Our Intellectual Property Rights Are Compromised, We May Not Be Able to
Compete  Effectively.  Because  of the  substantial  length of time and  expense
associated with bringing new products  through  development to the  marketplace,
the  pharmaceutical  industry  places  considerable  importance on obtaining and
maintaining  patent and trade secret protection for new  technologies,  products
and processes.  Our success will depend in part on several  factors,  including,
without limitation: our ability to obtain and maintain patent protection for our
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.


      Our core technology is licensed from the Research  Foundation of the State
University of New York at Stony Brook  ("SUNY") and is referred to herein 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.  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 related to
Periostat,  expire in 2004 and 2007. Of the twenty four patents,  one patent has
been  co-assigned  to the  University  of Miami,  Florida,  one  patent has been
co-assigned  to  Washington  University,  St.  Louis,  and one  patent  has been
co-assigned   to  the  Hospital  for  Joint   Diseases.   Of  the  eight  patent
applications,  one patent  application has been  co-assigned to the Hospital for
Joint Diseases, one patent application has been co-assigned to the University of
Miami, Florida, one patent application has been co-assigned to the University of
Rochester, and one patent application is co-owned by the University of Helsinki.

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

      If we do not  obtain  and  maintain  our  patent  protection  we may  face
increased  competition in the United States and in foreign  countries.  The SUNY
License imposes various payment and reporting  obligations on us. Our failure to
comply with these  requirements could result in the termination of such license.
If the  SUNY  License  is  terminated,  we  would  lose  our  right  to  exclude
competitors  from   commercializing   similar   products.   Moreover,   if  SUNY
subsequently licensed the technology to a competitor,  we could be excluded from
marketing the same products.


      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.
                                      -4-
<PAGE>

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 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.


      Although inventor(s) can never be unequivocally  certain they are first to
invent the subject  matter of a patent,  rigorous  examination  by the U.S.  and
foreign Patent Offices and  investigation by competitors lead us to believe that
we are the first  inventors of inventions  covered by issued patents and pending
patent applications.  We deem it unlikely that our issued patents and/or pending
applications will be invalid for lack of first true inventor(s).

      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.  However,  others who receive  patents  for  inventions
subsequent to ours cannot prevent the sale of our products  currently being made
and sold,  nor can they  require  licensing  and payment of fees or royalties to
enable us to conduct our business.

      If  any  relevant  claims  of  third-party   patents  which  pre-date  our
inventions  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

                                      -5-
<PAGE>

third parties and require  disclosure  and  assignment of rights to their ideas,
developments,  discoveries  and  inventions.  In  addition,  we try to get  such
agreements from our consultants,  advisors and research collaborators. We cannot
guarantee  that  adequate  protection  will be provided  for our trade  secrets,
know-how or other  proprietary  information if there is any  unauthorized use or
disclosure.  We  occasionally  provide  information  and  chemical  compounds to
research collaborators in academic institutions and request the collaborators to
conduct tests in 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.


      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.

      A Reduction in Third-Party  Reimbursements  May Negatively Affect the Sale
of  Our   Products.   Successful   commercialization   of   Periostat  or  other
pharmaceutical  products  that we may  develop or market  will  depend  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 costs, they may reduce 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 or elimination of reimbursement by
third party payors or regulatory limitations would negatively affect the sale of
our products.

      If We Cannot Compete Effectively,  Our Sales Will Decline.  Competition in
the  pharmaceutical  industry is intense.  Many  pharmaceutical  companies  have
substantially greater
                                      -6-


<PAGE>


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 these companies.

      We May be Unable  to  Successfully  Commercialize  New  Products.  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 anticipate developing
and  commercializing  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  our new
products.

      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 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.


                                      -7-
<PAGE>



      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.

      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


                                      -8-
<PAGE>



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.

                                 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  payable as dividends  to the selling  shareholders  for the period
July 1, 1999 through December 31, 1999 is included herein.

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


                                      -9-
<PAGE>

<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. .    1,662,630(3)     16.1(3)          34,680      1,627,950        15.8
Richard A. Horstmann ...................      707,536(4)      8.0(4)           1,960        705,576         8.0
Marquette Venture Partners II, L.P. ....      982,183(5)     11.2(5)           1,905        980,278        11.2
MVP II Affiliates Fund, L.P. ...........       28,066(5)        *(5)              55         28,011          *
Robert J. Easton .......................       66,083(6)        *(6)             392         65,691          *
Pebblebrook Partners Ltd. ..............        9,394(7)        *(7)             196          9,198          *
</TABLE>

---------

*   Less than one percent



(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 distributed in January
    2000.  Applicable  percentage  of ownership is based on 8,665,729  shares of
    common stock  outstanding  as of February  15,  2000,  plus any common stock
    equivalents or convertible  securities held,  shares  beneficially  owned by
    each such holder and shares of common stock issued by  CollaGenex in payment
    of dividends on the preferred stock as set forth herein.

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

(3) Stephen  A.  Kaplan,  a member  of  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  53,539  shares of common  stock  issued in payment of
    dividends on such preferred stock. Mr. Kaplan expressly disclaims beneficial
    ownership  of such shares,  except to the extent of any  indirect  pecuniary
    interest therein.

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


                                      -10-
<PAGE>


     Horstmann  and 3,026  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,
    2,941  shares of  common  stock  issued  in  payment  of  dividends  on such
    preferred  stock  and  890,860  shares  of common  stock  otherwise  held by
    Marquette) and MVP II (which  includes 2,528 shares of common stock issuable
    upon the  conversion  of 278  shares of  preferred  stock held by MVP II, 85
    shares of common  stock  issued in payment of  dividends  on such  preferred
    stock and  25,453  shares of common  stock  otherwise  held by MVP II).  Mr.
    Daverman expressly disclaims beneficial ownership of such shares,  except as
    to his proportionate interest in each of Marquette and MVP II.

(6) Mr. Easton is a member of CollaGenex's  Board of Directors.  Includes 15,000
    shares of common  stock  underlying  options  which  are  exercisable  as of
    February 15, 2000 or 60 days after such date. Also includes 18,182 shares of
    common stock  issuable upon the conversion of 2,000 shares  preferred  stock
    held by Mr.  Easton  and 606  shares of common  stock  issued in  payment of
    dividends on such  preferred  stock.  Also  includes  6,400 shares of common
    stock held as trustee for Second Easton Family  Charitable  Trust and 25,895
    shares of common stock otherwise held by Mr. Easton.

(7) Includes  9,091 shares of common stock issuable upon the conversion of 1,000
    shares of preferred  stock held by Pebblebrook  Partners Ltd. and 303 shares
    of common stock issued in payment of dividends on such preferred stock.

      All  offering  expenses are being paid by  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.


                                      -11-
<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.


                                      -12-
<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 since December 31, 1999; and

                                      -13-
<PAGE>



     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 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


                                      -14-
<PAGE>


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 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

                                      -15-
<PAGE>

him or her or incurred by him or her in any such  capacity or arising out of his
or her  status as such  whether or not the  corporation  would have the power to
indemnify him or her against such liabilities under Section 145.


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


                                      -16-
<PAGE>


Exchange  Commission such  indemnification is against public policy as expressed
in the Securities Act of 1933 and is, therefore, unenforceable.



                                      -17-
<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.    Other Expenses of Issuance and Distribution.

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


*     Estimated


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


Item 15.    Indemnification of Directors and Officers.

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

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

                                      II-1
<PAGE>

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

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


      Article  IX  of  CollaGenex's  By-laws  specifies  that  CollaGenex  shall
indemnify its directors, officers, employees and agents because he or she was or
is a director,  officer, employee or agent of CollaGenex or was or is serving at
the request of CollaGenex 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%

                                      II-2
<PAGE>



of  the  voting  power  of  all  outstanding  shares  of the  capital  stock  of
CollaGenex,  and, in certain  circumstances,  66 2/3% of the voting power of all
outstanding  shares of the Series D cumulative  convertible  preferred  stock of
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.


                                      II-3
<PAGE>


Item 16.    Exhibits.

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


          *5            Opinion of Buchanan Ingersoll Professional Corporation
                        as to legality of the shares of common stock.

          23.1          Consent of KPMG LLP.

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

         *24            Powers of Attorney of certain officers and directors of
                        CollaGenex.

*  Previously filed.



Item 17.    Undertakings.

    (a)  The undersigned Registrant hereby undertakes:

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

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

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

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

    (c) Insofar as indemnification  for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Registrant pursuant to the foregoing  provisions,  or otherwise,  the Registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore,  unenforceable. In the event that a claim for indemnification

                                      II-4
<PAGE>

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-5
<PAGE>


                                   SIGNATURES


      Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for filing on Form S-3 and has duly caused this  Amendment  to the
Registration  Statement  on  Form  S-3  to  be  signed  on  its  behalf  by  the
undersigned,  thereunto  duly  authorized,  in the  city of  Newtown,  State  of
Pennsylvania on this 28th day of June, 2000.


                                    COLLAGENEX PHARMACEUTICALS, INC.



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


                                      II-6
<PAGE>




      Pursuant to the requirements of the Securities Act of 1933, this Amendment
to the  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             June 28, 2000
---------------------------------  Executive Officer and
    Brian M. Gallagher, Ph.D.      Director (Principal
                                   Executive Officer)

/s/ Nancy C. Broadbent             Chief Financial Officer,     June 28, 2000
---------------------------------  Treasurer and Secretary
    Nancy C. Broadbent             (Principal Financial and
                                   Accounting Officer)

         *                         Chairman of the Board and    June 28, 2000
---------------------------------  Director
    Helmer P.K. Agersborg, Ph.D.

         *                         Director                     June 28, 2000
---------------------------------
    Peter Barnett, D.M.D.

         *                         Director                     June 28, 2000
---------------------------------
    Robert C. Black

         *                         Director                     June 28, 2000
---------------------------------
    James E. Daverman

         *                         Director                     June 28, 2000
---------------------------------
    Robert J. Easton

         *                         Director                     June 28, 2000
---------------------------------
    Stephen A. Kaplan

         *                         Director                     June 28, 2000
---------------------------------
    Terence E. Winters, Ph.D.


*By the signature set forth below, the undersigned,  pursuant to duly authorized
 powers of attorney filed with the Securities and Exchange Commission has signed
 this Amendment to the Registration Statement on behalf of the person indicated.

/s/ Nancy C. Broadbent
Nancy C. Broadbent
(Attorney-in-fact)


                                      II-7
<PAGE>



                                  EXHIBIT INDEX


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


    *5         Opinion of Buchanan Ingersoll Professional Corporation as to
               legality of the shares of common stock.


    23.1       Consent of KPMG LLP.


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

   *24         Powers of Attorney of certain officers and directors of
               CollaGenex.


*  Previously filed.


<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


Princeton, New Jersey
June 26, 2000



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