COLLAGENEX PHARMACEUTICALS INC
S-1/A, 1996-06-20
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 20, 1996
    
                                                       REGISTRATION NO. 333-3582
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 4
    
                                       TO
 
                                    FORM S-1
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                        COLLAGENEX PHARMACEUTICALS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                            <C>                            <C>
           DELAWARE                         2834                        52-1758016
   (STATE OF INCORPORATION)     (PRIMARY STANDARD INDUSTRIAL         (I.R.S. EMPLOYER
                                 CLASSIFICATION CODE NUMBER)        IDENTIFICATION NO.)
</TABLE>
 
                             301 SOUTH STATE STREET
                               NEWTOWN, PA 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.
                             301 SOUTH STATE STREET
                               NEWTOWN, PA 18940
                                 (215) 579-7388
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
 
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                           <C>
             DAVID J. SORIN, ESQ.                        ELLEN B. CORENSWET, ESQ.
           CATHERINE M. VERNA, ESQ.                     LUCI STALLER ALTMAN, ESQ.
              BUCHANAN INGERSOLL                     BROBECK, PHLEGER & HARRISON LLP
                COLLEGE CENTRE                         1301 AVENUE OF THE AMERICAS
            500 COLLEGE ROAD EAST                               30TH FLOOR
             PRINCETON, NJ 08540                            NEW YORK, NY 10019
                (609) 987-6800                                (212) 581-1600
</TABLE>
 
                            ------------------------
 
     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.
 
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- --------------------------------------------------------------------------------
<PAGE>   2
 
                        COLLAGENEX PHARMACEUTICALS, INC.
 
                             CROSS REFERENCE SHEET
 
                   PURSUANT TO ITEM 501(B) OF REGULATION S-K
                 SHOWING LOCATION IN PROSPECTUS OF INFORMATION
                         REQUIRED BY ITEMS OF FORM S-1
 
<TABLE>
<CAPTION>
          FORM S-1 ITEM NO. AND CAPTION                      LOCATION IN PROSPECTUS
- -------------------------------------------------  -------------------------------------------
<C>   <S>                                          <C>
  1.  Forepart of the Registration Statement and
        Outside Front Cover Page of Prospectus...  Outside Front Cover Page of Prospectus
  2.  Inside Front and Outside Back Cover Pages
        of Prospectus............................  Inside Front Cover and Outside Back Cover
                                                     Pages of Prospectus
  3.  Summary Information, Risk Factors and Ratio
        of Earnings to Fixed Charges.............  Prospectus Summary; Risk Factors; Ratio of
                                                     Earnings to Fixed Charges Inapplicable
  4.  Use of Proceeds............................  Prospectus Summary; Use of Proceeds
  5.  Determination of Offering Price............  Outside Front Cover Page of Prospectus;
                                                     Underwriting
  6.  Dilution...................................  Risk Factors; Dilution
  7.  Selling Security Holders...................  Inapplicable
  8.  Plan of Distribution.......................  Outside Front and Inside Front Cover Pages
                                                     of Prospectus; Risk Factors; Underwriting
  9.  Description of Securities to be
        Registered...............................  Description of Capital Stock
 10.  Interests of Named Experts and Counsel.....  Legal Matters; Experts
 11.  Information with Respect to the
        Registrant...............................  Outside Front and Inside Front Cover Pages
                                                     of Prospectus; Prospectus Summary; Risk
                                                     Factors; Use of Proceeds; Capitalization;
                                                     Dividend Policy; Dilution; Selected
                                                     Financial Data; Management's Discussion
                                                     and Analysis of Financial Condition and
                                                     Results of Operations; Business;
                                                     Management; Certain Transactions;
                                                     Principal Stockholders; Description of
                                                     Capital Stock; Shares Eligible for Future
                                                     Sale; Financial Statements
 12.  Disclosure of Commission Position on
        Indemnification for Securities Act
        Liabilities..............................  Inapplicable
</TABLE>
<PAGE>   3
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
   
                                                           SUBJECT TO COMPLETION
    
 
   
                                                                   JUNE 20, 1996
    
   
                                2,000,000 SHARES
    
 
                                     [LOGO]
 
                                  COMMON STOCK
                               ------------------
 
   
     All of the shares of Common Stock offered hereby are being sold by
CollaGenex Pharmaceuticals, Inc. ("CollaGenex Pharmaceuticals" or the
"Company"). Prior to this offering, there has been no public market for the
Common Stock of the Company. See "Underwriting" for the factors considered in
determining the initial offering price.
    
 
                               ------------------
 
        THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF RISK.
                          SEE "RISK FACTORS," PAGE 5.
                               ------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
      PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
        REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
   
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------
                                        PRICE             UNDERWRITING            PROCEEDS
                                         TO               DISCOUNTS AND              TO
                                       PUBLIC              COMMISSIONS           COMPANY(1)
<S>                             <C>                   <C>                   <C>
- -------------------------------------------------------------------------------------------------
Per Share......................        $10.00                 $0.70                 $9.30
- -------------------------------------------------------------------------------------------------
Total(2).......................      $20,000,000           $1,400,000            $18,600,000
- -------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Before deducting expenses of the offering estimated at $500,000.
 
   
(2) The Company has granted the Underwriters a 30-day option to purchase up to
    300,000 additional shares of Common Stock solely to cover over-allotments,
    if any. To the extent that the option is exercised, the Underwriters will
    offer the additional shares at the Price to Public shown above. If the
    option is exercised in full, the total Price to Public, Underwriting
    Discounts and Commissions and Proceeds to Company will be $23,000,000,
    $1,610,000 and $21,390,000, respectively. See "Underwriting."
    
 
                               ------------------
 
     The shares of Common Stock are offered by the several Underwriters, subject
to prior sale, when, as and if delivered to and accepted by them, and subject to
the right of the Underwriters to reject any order in whole or in part. It is
expected that delivery of the shares of Common Stock will be made at the offices
of Alex. Brown & Sons Incorporated, Baltimore, Maryland, on or about
            , 1996.
 
ALEX. BROWN & SONS                                        VOLPE, WELTY & COMPANY
       INCORPORATED
 
               THE DATE OF THIS PROSPECTUS IS             , 1996.
<PAGE>   4
 
                                    PICTURES
 
     [ARTIST'S RENDERING OF THE EFFECT OF PERIOSTAT ON PERIODONTAL DISEASE
                 PROGRESSION--UNCHANGED FROM PREVIOUS FILING.]
 
     The Company intends to furnish its stockholders with annual reports
containing financial statements certified by its independent auditors and
quarterly reports containing unaudited financial information for the first three
quarters of each year.
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
    "Periostat(R)," "CollaGenex(TM)" and the Company's logo are United States
trademarks of the Company. All other trade names, trademarks or service marks
appearing in this Prospectus are the property of their respective owners and are
not the property of the Company.
 
                                        2
<PAGE>   5
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and financial statements and notes thereto appearing elsewhere in
this Prospectus. This Prospectus contains forward-looking statements that
involve risks and uncertainties. The Company's actual results may differ
significantly from the results discussed in the forward-looking statements.
Factors that might cause such differences include those discussed in "Risk
Factors."
 
                                  THE COMPANY
 
     CollaGenex Pharmaceuticals is engaged in the development and
commercialization of innovative, proprietary medical therapies for the treatment
of periodontal disease and other dental pathologies. The Company believes that
its initial drug, Periostat, will be the first orally administered, systemically
delivered pharmaceutical to treat periodontitis. Unlike existing treatments,
which focus on the bacterial infection associated with periodontitis, Periostat
inhibits the chronic progressive tissue degradation characteristic of the
disease. The Company has completed three pivotal Phase III clinical trials on
Periostat and plans to submit a new drug application for Periostat during 1996.
Based on these clinical trials, the Company believes that Periostat is a safe,
efficacious, cost-effective therapy for the long-term treatment of
periodontitis.
 
     Periodontitis is a chronic disease characterized by the progressive loss of
attachment between the periodontal ligament and the surrounding alveolar bone,
ultimately resulting in tooth loss. According to industry data, in the United
States alone, an estimated one-third of all adults, or 67 million people, suffer
from some form of periodontitis. Approximately 13 million people seek
professional treatment annually for periodontal disease, resulting in over 17
million periodontal procedures and annual expenditures of approximately $6
billion. Due to the costs associated with the disease, the Company believes that
the treatment of periodontitis will be increasingly important to dental managed
care organizations and dental practitioners operating under capitated or fixed
fee arrangements.
 
     Existing therapies and those treatments known to be under development for
periodontitis are designed primarily to treat the bacterial infection associated
with periodontitis on a short-term, periodic basis. These treatments include
mechanical and surgical techniques, prophylactic approaches, such as
mouthwashes, and locally-delivered pharmaceutical therapies. The Company
believes, however, that periodic treatments designed solely to fight bacterial
infection are inadequate and that such treatments would be considerably more
effective if augmented by a long-term pharmaceutical therapy, such as Periostat,
which inhibits connective tissue destruction.
 
     The Company's core technology involves inhibiting the activity of certain
enzymes that destroy the connective tissues of the body. Connective tissues are
components of the body that form the structural basis for skin, bone, cartilage
and ligaments. In addition to periodontal disease, this core technology may be
applicable to other diseases and conditions characterized by the progressive
destruction of connective tissues of the body, such as cancer metastasis,
wounds, osteoarthritis, osteoporosis, rheumatoid arthritis and diabetic
nephropathy. The Company's core technology is licensed on an exclusive basis
from the Research Foundation of the State University of New York at Stony Brook.
 
     The Company's primary objective is to become a leading provider of
innovative medical therapies for the treatment of periodontal disease and other
dental pathologies. The Company's strategy to achieve this objective is to: (i)
develop market acceptance of Periostat among periodontists, general dentists,
third-party payors and patients; (ii) establish a sales and marketing
organization; (iii) build relationships with dental managed care organizations;
(iv) acquire complementary technologies and products; and (v) leverage the
Company's core technology through strategic partnering arrangements for
non-dental applications.
 
     The Company was incorporated in Delaware in January 1992 under the name
Collagenex, Inc. The Company's name was changed to CollaGenex Pharmaceuticals,
Inc. in April 1996. The Company's executive offices are located at 301 South
State Street, Newtown, PA 18940, and its telephone number is (215) 579-7388.
 
                                        3
<PAGE>   6
 
                                  THE OFFERING
 
   
<TABLE>
<S>                                                   <C>
Common Stock offered hereby.........................  2,000,000 shares
Common Stock to be outstanding after the offering...  7,514,283 shares(1)
Use of proceeds.....................................  For marketing expenses associated with
                                                      new product introduction; the
                                                      establishment of sales and marketing
                                                      capabilities; pharmaceutical
                                                      development; and other general
                                                      corporate purposes, including working
                                                      capital
Proposed Nasdaq National Market symbol..............  CGPI
</TABLE>
    
 
- ---------------
(1) Excludes 288,500 shares of Common Stock issuable upon the exercise of stock
    options outstanding as of March 31, 1996 at a weighted average exercise
    price of $0.99 per share, of which options to purchase 66,837 shares of
    Common Stock are exercisable. See "Management -- Directors' Compensation"
    and "-- Stock Option Plans."
 
     Except as otherwise specified, all information in this Prospectus: (i)
assumes no exercise of the Underwriters' over-allotment option; (ii) has been
adjusted to give effect to a one-for-two reverse stock split of the Company's
Common Stock effected on April 10, 1996; (iii) assumes the conversion of all
outstanding shares of Series A, Series B and Series C mandatorily redeemable
convertible preferred stock (the "Redeemable Preferred Stock") into an aggregate
of 5,199,124 shares of Common Stock upon the consummation of this offering; and
(iv) assumes an increase in the number of authorized shares of capital stock
upon the consummation of this offering. See "Description of Capital Stock" and
"Underwriting."
 
                             SUMMARY FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                                     THREE MONTHS
                                                  PERIOD FROM                                            ENDED
                                               JANUARY 10, 1992      YEARS ENDED DECEMBER 31,          MARCH 31,
                                                (INCEPTION) TO     -----------------------------   -----------------
                                               DECEMBER 31, 1992    1993       1994       1995      1995      1996
                                               -----------------   -------    -------    -------   -------   -------
<S>                                            <C>                 <C>        <C>        <C>       <C>       <C>
STATEMENT OF OPERATIONS DATA:
  Revenues...................................       $    --        $    --    $    --    $    --   $    --   $    --
  Operating loss.............................        (1,464)        (2,526)    (2,721)    (5,183)   (1,332)   (1,394)
  Net loss...................................        (1,416)        (2,483)    (2,653)    (5,269)   (1,343)   (1,333)
  Net loss allocable to common
    stockholders.............................        (1,607)        (2,834)    (3,229)    (6,028)   (1,487)   (1,716)
Pro forma:
  Net loss per share(1)......................                                            $ (1.10)            $ (0.24)
  Shares used in computing pro forma net loss
    per share(1).............................                                              4,808               5,546
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                              AS OF MARCH 31, 1996
                                                                ------------------------------------------------
                                                                                                 PRO FORMA AS
                                                                 ACTUAL       PRO FORMA(2)      ADJUSTED(2)(3)
                                                                ---------     ------------     -----------------
<S>                                                             <C>           <C>              <C>
BALANCE SHEET DATA:
  Cash and cash equivalents...................................  $   4,968      $    4,968          $  23,124
  Total assets................................................      5,077           5,077             23,177
  Mandatorily redeemable convertible preferred stock..........     19,291         --                --
  Deficit accumulated during the development stage............    (13,154)        (13,154)           (13,154)
  Total stockholders' equity (deficit)........................    (15,216)          4,075             22,175
</TABLE>
    
 
- ---------------
(1) See Note 2 of Notes to Financial Statements for information concerning
    computation of pro forma net loss per share.
(2) Gives effect to the automatic conversion of all issued and outstanding
    shares of Redeemable Preferred Stock into 5,199,124 shares of Common Stock.
   
(3) Adjusted to reflect the sale of 2,000,000 shares of Common Stock offered
    hereby after deducting underwriting discounts and commissions and estimated
    offering expenses payable by the Company. See "Use of Proceeds" and
    "Capitalization."
    
 
                                        4
<PAGE>   7
 
                                  RISK FACTORS
 
     In addition to the other information in this Prospectus, the following
factors should be considered carefully in evaluating an investment in the shares
of Common Stock offered by this Prospectus.
 
     Uncertainty Of FDA Approval of Periostat.  Pharmaceutical products are
subject to stringent regulation by governmental authorities in the United States
and in other countries. Approval of Periostat by the United States Food and Drug
Administration ("FDA") is required before any marketing or sales of Periostat
may commence in the United States. There can be no assurance that the Company's
new drug application ("NDA") with respect to Periostat will be submitted in a
timely manner or, if so submitted, that it will be approved by the FDA on a
timely basis, or at all. The FDA review process can be lengthy and
unpredictable, and the Company may encounter delays or rejection of its NDA when
submitted. NDAs submitted to the FDA take, on average, one to three years to
obtain approval. If questions arise during the FDA review process, approval may
take a significantly longer period of time. The Company completed Phase III
clinical trials for Periostat in December 1994 and, since that time, has been
engaged in the preparation of its NDA and discussions with the FDA regarding,
among other things, additional pre-clinical information to be submitted in the
NDA. In late 1995, the FDA requested that the Company conduct additional animal
studies regarding certain effects associated with the long-term dosing of
doxycycline hyclate ("doxycycline"), a tetracycline that is the active
ingredient in Periostat, and that the data be included in the Company's NDA
submission. Such animal studies currently are being conducted. Any delay in the
completion of such studies would delay the Company's NDA submission and any such
delay, if extended, could have a material adverse effect on the Company's
business, financial condition and results of operations. In addition, a
post-approval, post-marketing animal study related to long-term dosing of
doxycycline also was requested. There can be no assurance that the FDA will not
require additional pre-clinical or clinical supporting data or other information
as a condition of approval of Periostat. Moreover, if approval of Periostat is
granted, such approval may entail limitations on the indicated uses for which it
may be marketed. The Company has not received any indication from the FDA that
any limitations on the Company's proposed uses as contemplated by the Company's
proposed NDA will be imposed. There can be no assurance, however, that such
limitations will not be imposed. Failure to obtain FDA approval of a NDA for
Periostat would have a material adverse effect on the Company's business,
financial condition and results of operations. In addition, the Company believes
that Periostat will not be treated as an "antibiotic" drug by the FDA primarily
because the drug currently is under review by the Division of Dermatological and
Dental Drug Products, not by the Division of Anti-Infective Drug Products.
Therefore, the Company believes that Periostat will be subject to a three-year
period of exclusivity before generic versions may be approved by the FDA for
commercial sale, if the Company is first in obtaining FDA marketing approval for
an oral dosage form containing 20mg of doxycycline for the treatment of adult
periodontitis and the FDA determines that the clinical investigations conducted
by or for the Company are essential to approval of the marketing application.
There can be no assurance, however, that Periostat will not be treated as an
"antibiotic" or that the Company will be able to satisfy the other criteria for
obtaining three-year marketing exclusivity, in which case no exclusivity period
will be available. See "Business--Periostat" and "--Government Regulation."
 
     Uncertainty of Market Acceptance of Periostat.  The Company's growth and
success will depend on market acceptance of Periostat by periodontists, dental
practitioners, other health care providers, third-party payors and patients.
Market acceptance will depend, in part, on the Company's ability to demonstrate
to these parties the effectiveness of patient-administered pharmaceuticals for
the treatment of periodontal disease. Treatment of periodontal disease with
Periostat is based upon the long-term use of a sub-antibiotic dosage form of
doxycycline. This dosage form has not been approved for periodontal disease or
any other indication. There can be no assurance that practitioners will
prescribe Periostat. Even if Periostat were to gain market acceptance, sales of
Periostat would depend to a large extent on the availability of reimbursement
from third-party payors, including
 
                                        5
<PAGE>   8
 
managed dental care plans. There can be no assurance that the dental community
or third-party payors will accept Periostat as a cost-effective means for the
treatment of periodontal disease.
 
     Dependence on a Single Product.  The Company has no product approved for
marketing in the United States or in any foreign country. The Company's future
revenues and profitability are critically dependent on the approval of the NDA
for Periostat and the Company's ability to successfully market and sell
Periostat. Although the Company seeks to market complementary therapeutic
products and diagnostic tests with Periostat, the Company expects that if the
FDA approves the Company's NDA for Periostat, substantially all of the Company's
product revenues will be derived from sales of Periostat. The Company has not
yet filed its NDA for Periostat, and there can be no assurance that the Company
will receive FDA approval of Periostat. If the Company receives FDA approval of
Periostat, commercial success will depend on acceptance of this treatment for
periodontitis by periodontists, dental practitioners, other health care
providers, third-party payors and patients. The Company's inability to obtain
FDA approval of its NDA, to obtain market acceptance of Periostat, to
successfully commercialize Periostat or to obtain adequate third-party
reimbursement coverage would have a material adverse effect on the Company's
business, financial condition and results of operations.
 
     Limited Operating History; History of Operating Losses; Uncertainty of
Future Profitability. The Company has a limited operating history. For the
period from January 10, 1992 (inception) to December 31, 1992, for the years
ended December 31, 1993, 1994 and 1995, and for the three months ended March 31,
1996, the Company had net losses of approximately $1.4 million, $2.5 million,
$2.7 million, $5.3 million and $1.3 million, respectively. Such losses have
resulted primarily from the expenses associated with the Company's
pharmaceutical development program, the Periostat clinical trials and the
preparation of the NDA for submission to the FDA. As of March 31, 1996, the
Company had an accumulated deficit of approximately $13.2 million. The Company's
expansion of its operations, including establishment of a direct sales and
marketing organization in anticipation of possible FDA approval of a NDA, will
result in significant expenses over at least the next two years. The Company
does not expect to receive any significant revenues from Periostat or from any
other product in the foreseeable future, if at all, to offset these expenses.
There can be no assurance that the Company will receive FDA approval of its NDA,
that it will be able to market and sell Periostat successfully or that
profitability will ever be achieved. See "Management's Discussion and Analysis
of Financial Condition and Results of Operations."
 
     Dependence on Scale-up and Management of Growth.  To date, substantially
all of the activities of the Company, including research and development,
manufacturing of active drug ingredients and pharmaceuticals, clinical trials
and preparation of the NDA for Periostat have been performed primarily by third
parties on a contractual basis. As of March 31, 1996, the Company had only five
employees. In anticipation of the commercial introduction of Periostat, the
Company will need to increase significantly its number of employees and enhance
its management systems and procedures. In particular, if the Company does not
contract with marketing partners or independent sales organizations or sales
agents for the marketing of Periostat in the United States, the Company will
need to establish a direct sales force. Although the Company does not currently
plan to engage directly in research and development activities or chemical or
pharmaceutical manufacturing, there can be no assurance that the Company will
not undertake those activities in the future. Furthermore, there can be no
assurance that managing third parties with respect to a growing number of
business activities and operations will not place a significant burden on the
management and operations of the Company. There can be no assurance that the
Company will manage effectively its growth and any failure to do so could have a
material adverse effect on the Company's business, financial condition and
results of operations. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and "Business--Marketing."
 
     No Marketing or Sales Capability or History.  The Company has no history in
marketing, distributing or selling pharmaceutical products in the dental market
or otherwise and will have to develop a sales force or rely on marketing
partners or other arrangements with third parties for the
 
                                        6
<PAGE>   9
 
marketing, distribution and sale of Periostat and any other products marketed by
the Company. If the Company determines to sell Periostat in the United States
other than through the use of marketing partners or independent sales
organizations or sales agents, the Company will need to establish a direct sales
force. No assurance can be given that such a marketing and sales organization
can be established successfully or that the Company's direct sales force, if
established, will succeed in promoting Periostat to the dental community,
patients and third-party payors and otherwise successfully marketing Periostat.
If the Company relies on marketing partners or other arrangements, the Company
will be dependent upon the success of these outside parties in performing their
responsibilities. Although the Company believes that such parties, if any, will
have an economic motivation to perform successfully their contractual
responsibilities, the amount and timing of resources to be devoted to these
activities may not be within the Company's control. There can be no assurance
that such parties will perform their contractual obligations or that the
Company's reliance on others for the marketing of Periostat will not result in
unforeseen problems. If the requisite foreign regulatory approvals are obtained,
the Company intends to establish a network of sub-licensees or distributors to
market and sell Periostat outside of the United States. To date, no such network
has been established. There can be no assurance that the Company will be able to
recruit and retain qualified sales and marketing personnel and foreign
sub-licensees or distributors or marketing partners or that the Company's
marketing and sales efforts will be successful. Failure to establish
successfully a marketing and sales organization, whether directly or through
third parties, would have a material adverse effect on the Company's business,
financial condition and results of operations. See "Business--Marketing."
 
     Dependence on Patents, Licenses and Proprietary Rights; Enforcement of
Rights.  The Company's success will depend in part on its ability to obtain
patent protection for its technologies, products and processes, and to preserve
its trade secrets and operate without infringement of proprietary rights of
other parties both in the United States and in foreign countries. 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. The Company depends on
a license from the Research Foundation of the State University of New York at
Stony Brook ("SUNY") for all of its core technology (the "SUNY License"). The
SUNY License grants the Company an exclusive worldwide license to make and sell
products employing tetracyclines that are designed or utilized to alter a
biological process. Eleven U.S. patents and four U.S. patent applications held
by SUNY are licensed to the Company under the SUNY License. The primary U.S.
patent claims methods of use of conventional tetracyclines to inhibit
pathologically excessive collagenolytic activity (the "Primary Patent"), while a
related U.S. patent claims methods of use of tetracyclines which have no
antibiotic activity (the "Secondary Patent"). SUNY did not apply in foreign
countries for patents corresponding to the Primary Patent but has obtained
patents that correspond to the Secondary Patent in Australia, Canada and certain
European countries. A patent application corresponding to the Secondary Patent
is pending in Japan. SUNY also has obtained patents in certain European
countries, Canada and Japan and has pending patent applications in certain other
foreign countries which correspond to its U.S. patents relating to methods of
use of tetracyclines to reduce bone loss. The Company's rights under the SUNY
License are subject to certain statutory rights of the U.S. government resulting
from federal support of research activities at SUNY. The failure to obtain and
maintain patent protection may mean that the Company will face increased
competition in the United States and in foreign countries. The SUNY License
imposes various payment and reporting obligations on the Company. Failure of the
Company to comply with these requirements could result in the termination of
such license. The termination of the SUNY License, or the failure to obtain and
maintain patent protection for the Company's technologies, would have a material
adverse effect on the Company's business, financial condition and results of
operations. One of the U.S. patents and a corresponding Japanese patent
application licensed to the Company under the SUNY License are owned jointly by
SUNY and a Japanese company. These patent rights, which expire in 2012, cover
particular CMTs (the "Jointly Owned CMTs") that were
 
                                        7
<PAGE>   10
 
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 the Company's Periostat product but could, in the future, prove to
be important for one or more of the Company's other potential applications of
its technology. If the Company does incorporate the Jointly Owned CMTs in any
future product, it may be precluded from marketing these products in Asia,
Australia and New Zealand and could experience increased competition in other
markets from the joint owner. There can be no assurance that patent applications
to which the Company holds rights will result in the issuance of patents, that
any patents issued or licensed to the Company will not be challenged and held to
be invalid, or that any such patents will provide commercially significant
protection to the Company's technology, products and processes. Since patent
applications in the United States are maintained in secrecy until patents issue,
and since publication of discoveries in the scientific and patent literature
tend to lag behind actual discoveries by several months, the Company cannot be
certain that it was the first creator of inventions covered by pending patent
applications or that it was the first to file patent applications for such
inventions. In addition, there can be no assurance that others will not
independently develop substantially equivalent proprietary information not
covered by patents to which the Company owns rights or obtain access to the
Company's know-how, or that others will not be issued patents that may prevent
the sale of one or more of the Company's products, or require licensing and the
payment of significant fees or royalties by the Company to third parties in
order to enable the Company to conduct its business. In the event that any
relevant claims of third-party patents are upheld as valid and enforceable, the
Company could be prevented from selling its products or could be required to
obtain licenses from the owners of such patents. There can be no assurance that
such licenses would be available or, even if available, would be on terms
acceptable to the Company. The Company's failure to obtain these licenses would
have a material adverse effect on the Company's business, financial condition
and results of operations. Due to the general availability of generic
tetracyclines for use as antibiotics, the Company could become involved in
infringement actions to protect its patents, which could entail substantial
costs to the Company. Regardless of the outcome, defense and prosecution of
patent claims is expensive and time consuming, and results in the diversion of
substantial financial, management and other resources from the Company's other
activities. Although federal law prohibits the promotion or marketing of
pharmaceuticals for unauthorized uses, there can be no assurance 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. The Company's success also is dependent upon
know-how, unpatentable trade secrets, and the skills, knowledge and experience
of its scientific and technical personnel. The Company requires all employees to
enter into confidentiality agreements that prohibit the disclosure of
confidential information to anyone outside the Company and require disclosure
and assignment to the Company of rights to their ideas, developments,
discoveries and inventions. In addition, the Company seeks to obtain such
agreements from its consultants, advisors and research collaborators. There can
be no assurance that adequate protection will be provided for the Company's
trade secrets, know-how or other proprietary information in the event of any
unauthorized use or disclosure. The Company occasionally provides information
and chemical compounds to research collaborators in academic institutions and
requests the collaborators to conduct tests in order to investigate certain
properties of the compounds. There can be no assurance 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 the Company on
acceptable terms. If the assertion of intellectual property rights by an
academic institution can be substantiated, failure of the academic institution
to grant intellectual property rights to the Company could have a material
adverse effect on the Company's business, financial condition and results of
operations. See "Business--Patents, Trade Secrets and Licenses."
 
                                        8
<PAGE>   11
 
     Dependence on Third-Party Suppliers.  The Company does not have any
manufacturing facilities and does not intend to establish such facilities. The
Company currently relies on a single supplier of doxycycline, the active
ingredient in Periostat. This supplier produces a substantial portion of the
doxycycline used in the United States. There are relatively few alternative
sources of supply for doxycycline, and the Company may not be able to establish
additional or replacement suppliers of doxycycline quickly. Any interruption in
the supply of doxycycline would have a material adverse effect on the Company's
business, financial condition and results of operations. Periostat is currently
manufactured by a single contract manufacturer, which has made substantially all
of the Periostat used in the Company's clinical trials. To be successful,
Periostat must be manufactured in commercial quantities under good manufacturing
practices ("GMP") prescribed by the FDA and at an acceptable cost. The FDA
periodically inspects manufacturing facilities in the United States in order to
assure compliance with applicable GMP requirements. Foreign manufacturers also
are inspected by the FDA if their drugs are marketed in the United States.
Failure of the Company's foreign supplier of doxycycline or failure of the
Company's manufacturer of Periostat to comply with GMP regulations or other FDA
regulatory requirements would have a material adverse effect on the Company's
business, financial condition and results of operations. The Company intends to
utilize contract manufacturers for the commercial manufacture of Periostat.
There can be no assurance that the Company will be able to enter into or
maintain manufacturing arrangements on acceptable terms, if at all. If the
Company is not able to enter into or maintain commercial manufacturing
agreements, it could encounter delays in introducing or supplying Periostat.
There can be no assurance that any contract manufacturers engaged by the Company
in the future will perform their contractual obligations or remain in compliance
with GMP. See "Business--Manufacturing and Suppliers."
 
     Competition and Rapid Technological Change.  Competition in the
pharmaceutical industry is intense. Many pharmaceutical companies are engaged in
research and development on disorders characterized by connective tissue
destruction and could focus such efforts on periodontal disease. Many of such
competitors have substantially greater financial, marketing, sales, distribution
and technical resources than the Company, and more experience in research and
development, clinical trials, regulatory matters, manufacturing and marketing
than the Company. Competitors of the Company and its potential collaborators may
develop products that compete successfully with the Company's products and may
develop and commercialize such products more rapidly than the Company or its
collaborators. The Company anticipates that it will face increased competition
in the future as new companies enter the market and new technologies become
available. The Company's technology may be rendered obsolete or uneconomical by
technological advances or entirely different approaches developed by one or more
of the Company's competitors. See "Business--Competition."
 
     Uncertainty of New Product Development; Dependence on Collaborators.  The
Company has several potential products for non-dental applications that are in
various preliminary stages of development and will require significant
additional research and development, clinical trials and appropriate regulatory
approval before any such products may be commercialized. All of the Company's
proposed products are based upon its core technology. There can be no assurance
that such technology will be applicable to the product applications being
pursued by the Company. The Company's strategy for the development and
commercialization of pharmaceuticals for non-dental applications is to establish
collaborations and licensing arrangements with third parties pursuant to which
the Company's collaborators likely will be responsible for pre-clinical testing
and human clinical trials, the preparation and submission of applications for
regulatory approval for potential pharmaceutical products and the manufacture
and commercialization of such products. The Company does not currently intend to
perform any of these activities with respect to any product involving non-dental
applications. The Company will, therefore, be dependent upon the expertise of
and dedication of sufficient resources by third parties to develop and
commercialize other products based on its core technology. There can be no
assurance that the Company will be able to establish collaborative or licensing
arrangements, that any such arrangements or licenses will be on
 
                                        9
<PAGE>   12
 
terms favorable to the Company, or that current or future collaborative or
licensing arrangements ultimately will be successful. Should any future
collaborative partner fail to develop successfully any drug candidate to which
it has rights, the Company's business could be materially adversely affected. In
addition, there can be no assurance that any such collaborators will not pursue
alternative technologies or drug candidates, either on their own or in
collaboration with others, as a means for developing treatments for the diseases
sought to be addressed by the Company's programs. See "Business--Strategy,"
"--Other Potential Applications" and "--Research and Development."
 
     Extensive Government Regulation.  Regulation by governmental entities in
the United States and other countries will be a significant factor in the
production and marketing of Periostat as well as any other pharmaceutical
product developed by the Company or a collaborator of the Company. Virtually all
pharmaceutical products require regulatory approval by government agencies prior
to commercialization. In particular, human pharmaceutical therapeutic products
are subject to rigorous pre-clinical and clinical testing and other approval
procedures by the FDA and by foreign regulatory authorities. Various federal
and, in some cases, state statutes and regulations also govern or influence the
manufacturing, safety, labeling, storage, record keeping and marketing of such
pharmaceutical products. The process of obtaining these approvals and the
subsequent compliance with appropriate federal and foreign statutes and
regulations are time consuming and require the expenditure of substantial
resources. Generally, in order to gain FDA approval, a company first must
conduct pre-clinical studies in a laboratory and in animal models to obtain
preliminary information on a compound's efficacy and to identify any safety
problems. The results of these studies are submitted as part of an
Investigational New Drug ("IND") application that the FDA must review before
human clinical trials of an investigational drug can start. Clinical trials are
normally done in three phases and generally take two to five years, but may take
longer, to complete. After completion of clinical trials of a new product, FDA
and foreign regulatory authority marketing approval must be obtained. NDAs
submitted to the FDA take, on average, one to three years to obtain approval. If
questions arise during the FDA review process, approval may take a significantly
longer period of time. The testing and approval processes require substantial
time and effort and there can be no assurance that any approval will be granted
on a timely basis, if at all. Even if regulatory clearances are obtained, a
marketed product is subject to continual review, and later discovery of
previously unknown problems or failure to comply with the applicable regulatory
requirements may result in restrictions on the marketing of a product or
withdrawal of the product from the market as well as possible civil or criminal
sanctions. For marketing outside the United States, the Company also will be
subject to foreign regulatory requirements governing human clinical trials and
marketing approval for pharmaceutical products. The requirements governing the
conduct of clinical trials, product licensing, pricing and reimbursement vary
widely from country to country. None of the Company's products has been approved
for marketing in the United States or elsewhere. No assurance can be given that
the Company will be able to obtain regulatory approval for any of such products.
In addition, the Company believes that Periostat will not be treated as an
"antibiotic" drug by the FDA primarily because the drug currently is under
review by the Division of Dermatological and Dental Drug Products, not by the
Division of Anti-Infective Drug Products. Therefore, the Company believes that
Periostat will be subject to a three-year period of exclusivity before generic
versions may be approved by the FDA for commercial sale, if the Company is first
in obtaining FDA marketing approval for an oral dosage form containing 20mg of
doxycycline for the treatment of adult periodontitis and the FDA determines that
the clinical investigations conducted by or for the Company are essential to
approval of the marketing application. There can be no assurance, however, that
Periostat will not be treated as an "antibiotic" or that the Company will be
able to satisfy the other criteria for obtaining three-year marketing
exclusivity, in which case no exclusivity period will be available. Failure to
obtain requisite governmental approvals or failure to obtain approvals of the
scope requested will delay or preclude the Company or its licensees or marketing
partners from marketing their products, or limit the commercial use of the
products, and thereby could have a material adverse effect on the Company's
business, financial condition and results of operations. See
"Business--Government Regulation."
 
                                       10
<PAGE>   13
 
     Dependence on Key Personnel.  The Company is highly dependent on its
current management and scientific advisors and consultants. The loss of one or
more members of the Company's management or key scientific advisors and
consultants could have a material adverse effect on the Company's business,
financial condition and results of operations. The Company does not maintain key
person life insurance on any of its management or scientific advisors and
consultants. The Company's success will depend in part on the continued service
of its management and key scientific advisors and consultants and its ability to
identify, hire and retain additional personnel. There is intense competition for
qualified personnel in the areas of the Company's activities and there can be no
assurance that the Company will be able to attract and retain such personnel
necessary for the development of the Company's business. Failure to attract and
retain key personnel could have a material adverse effect on the Company's
business, financial condition and results of operations. See
"Business--Employees" and "Management."
 
     Uncertainty of Third-Party Reimbursement and Health Care
Reform.  Successful commercialization of any pharmaceutical products the Company
may develop will depend, in part, upon the availability of reimbursement or
funding from third-party health care payors such as government and private
insurance plans, including dental managed care plans. Third-party payors are
continuing their efforts to contain or reduce the cost of health care through
various means. For example, third-party payors increasingly are challenging the
prices charged for medical products and services. In addition, significant
uncertainty exists as to the reimbursement status of newly approved
pharmaceutical products. There can be no assurance that third-party
reimbursement or funding will be available or will permit price levels
sufficient to realize an appropriate return on the Company's investment in its
pharmaceutical product development. The levels of revenues and profitability of
pharmaceutical companies including the Company also may be affected by the
continuing efforts of governmental and third-party payors to contain or reduce
the costs of health care through various means and the initiatives of
third-party payors with respect to the availability of reimbursement. For
example, in the United States, there have been, and the Company expects that
there will continue to be, a number of federal and state proposals to implement
similar governmental control. It is uncertain what legislative proposals may be
adopted or what actions federal, state or private payors for health care
products and services may take in response to any health care reform proposals
or legislation. In certain foreign markets, pricing or profitability of
prescription pharmaceuticals is subject to governmental control. Such proposals
or reforms also could have a material adverse effect on the Company's business,
financial condition and results of operations. See "Business -- Marketing."
 
     Product Liability; Lack of Product Liability Insurance.  The Company's
business may be adversely affected by potential product liability risks inherent
in the testing, manufacturing and marketing of Periostat and other products
developed by the Company or its collaborators. There can be no assurance that
product liability claims will not be asserted against the Company, its
collaborators or licensees. The Company does not currently have product
liability insurance. The Company intends to obtain such insurance prior to
marketing Periostat or any other product. There can be no assurance, however,
that the Company will be able to obtain or maintain adequate product liability
insurance on acceptable terms or that such insurance will provide adequate
coverage against potential liabilities. Furthermore, there can be no assurance
that any collaborators or licensees of the Company will agree to indemnify the
Company, be sufficiently insured or have a net worth sufficient to satisfy
product liability claims. As a result, a product liability claim or recall could
have a material adverse effect on the Company's business, financial condition
and results of operations.
 
     Future Capital Needs; Uncertainty of Additional Financing.  There can be no
assurance that the net proceeds from this offering, together with the Company's
existing capital resources, will be adequate to fund the Company's operations
through at least 1997. The Company anticipates that it may be required to raise
additional capital over a period of several years in order to conduct its
operations. Such capital may be raised through additional public or private
financings, as well as collaborative arrangements, borrowings and other
available sources. The Company's capital require-
 
                                       11
<PAGE>   14
 
ments depend on numerous factors, including the ability of the Company to obtain
FDA approval of and successfully commercialize Periostat, competing
technological and market developments, the ability of the Company 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. To
the extent that additional capital is raised through the sale of equity or
convertible debt securities, the issuance of such securities could result in
dilution to the Company's existing stockholders. There can be no assurance that
additional funding, if necessary, will be available on favorable terms, if at
all. If adequate funds are not available, the Company may be required to curtail
operations significantly or to obtain funds through entering into arrangements
with collaborative partners or others that may require the Company to relinquish
rights to certain of its technologies, product candidates, products or potential
markets that the Company would not otherwise relinquish. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
 
   
     Shares Eligible for Future Sale and Potential Adverse Effect on Market
Price.  Future sales of Common Stock in the public market following this
offering could adversely affect the market price of the Common Stock. Upon
completion of this offering, the Company will have 7,514,283 shares of Common
Stock outstanding, assuming no exercise of currently outstanding options. Of
these shares, the 2,000,000 shares sold in this offering (plus any additional
shares sold upon exercise of the Underwriters' over-allotment option) will be
freely transferable without restriction under the Securities Act of 1933, as
amended (the "Securities Act"), unless they are held by "affiliates" of the
Company as that term is used under the Securities Act and the regulations
promulgated thereunder. Stockholders of the Company, holding in the aggregate
approximately 5,514,283 shares of Common Stock, have agreed, subject to certain
limited exceptions, not to sell or otherwise dispose of any of the shares held
by them as of the date of this Prospectus for a period of 180 days after the
date of this Prospectus without the prior written consent of Alex. Brown & Sons
Incorporated. At the end of such 180-day period, approximately 2,827,051 shares
of Common Stock will be eligible for immediate resale, subject to compliance
with Rule 144. In addition, an aggregate of approximately 140,218 shares will be
eligible for immediate resale or issuable upon exercise of vested options,
subject to compliance with Rules 144 and 701. All remaining shares of Common
Stock outstanding will become eligible for sale at various times over a period
of less than two years and could be sold earlier if the holders exercise any
available registration rights. The holders of 5,199,124 shares of Common Stock
have the right in certain circumstances to require the Company to register their
shares under the Securities Act for resale to the public. If such holders, by
exercising their demand registration rights, cause a large number of shares to
be registered and sold in the public market, such sales could have an adverse
effect on the market price for the Company's Common Stock. If the Company were
required to include in a Company-initiated registration shares held by such
holders pursuant to the exercise of their piggyback registration rights, such
sales may have an adverse effect on the Company's ability to raise needed
capital. See "Management--Stock Option Plans," "Description of Capital
Stock--Registration Rights of Certain Holders and Rights of Participation in
Future Offerings," "Shares Eligible for Future Sale" and "Underwriting."
    
 
     No Prior Public Market For Common Stock; Possibility of Volatility of Stock
Prices.  Prior to this offering, there has been no public market for the Common
Stock and there can be no assurance that an active public market for the Common
Stock will develop or be sustained after this offering. The initial offering
price will be determined by negotiations between the Company and the
Underwriters and is not necessarily indicative of the market price at which the
Common Stock of the Company will trade after this offering. The market prices
for securities of life sciences companies have been highly volatile and the
market has experienced significant price and volume fluctuations that are
unrelated to the operating performance of particular companies. Announcements of
technological innovations or new commercial products by the Company or its
competitors, developments concerning proprietary rights, including patents and
litigation matters, publicity regarding actual or potential results with respect
to Periostat or other products under development, regulatory developments in
both the United States and foreign countries, general market conditions, as well
as
 
                                       12
<PAGE>   15
 
fluctuations in the Company's revenues and financial results and other factors,
may have a significant impact on the market price of the Common Stock. See
"Underwriting."
 
     Anti-Takeover Effect of Certain Charter and By-Law Provisions and Delaware
Law.  The Company's Amended and Restated Certificate of Incorporation (the
"Certificate of Incorporation") authorizes the Board of Directors to issue,
without stockholder approval, 5,000,000 shares of Preferred Stock with voting,
conversion and other rights and preferences that could adversely affect the
voting power or other rights of the holders of Common Stock. The issuance of
Preferred Stock or of rights to purchase Preferred Stock could be used to
discourage an unsolicited acquisition proposal. In addition, the possible
issuance of Preferred Stock could discourage a proxy contest, make more
difficult the acquisition of a substantial block of the Company's Common Stock
or limit the price that investors might be willing to pay in the future for
shares of the Company's Common Stock. The Certificate of Incorporation also
provides that: (i) the affirmative vote of the holders of at least 80% of the
voting power of all outstanding shares of the capital stock of the Company shall
be required to adopt, amend or repeal any provision of the bylaws of the
Company; (ii) stockholders of the Company may not take any action by written
consent; (iii) special meetings of stockholders may be called only by the
President, the Chairman of the Board or a majority of the Board of Directors and
business transacted at any such special meeting shall be limited to matters
relating to the purposes set forth in the notice of such special meeting; (iv)
the Board of Directors, when evaluating an offer related to a tender or exchange
offer or other business combination, is authorized to give due consideration to
any relevant factors, including the social, legal and economic effects upon
employees, suppliers, customers, creditors, the community in which the Company
conducts its business, and the economy of the state, region and nation; and (v)
the affirmative vote of the holders of at least 75% of the voting power of all
outstanding shares of the capital stock of the Company shall be required to
amend the above provisions or the limitation on director liability. The
foregoing provisions of the Certificate of Incorporation could have the effect
of delaying, deterring or preventing a change in control of the Company. In
addition, the Company is subject to Section 203 of the Delaware General
Corporation Law which, subject to certain exceptions, restricts certain
transactions and business combinations between a corporation and a stockholder
owning 15% or more of the corporation's outstanding voting stock (an "interested
stockholder") for a period of three years from the date the stockholder becomes
an interested stockholder. These provisions may have the effect of delaying or
preventing a change of control of the Company without action by the stockholders
and, therefore, could adversely affect the price of the Company's Common Stock.
In the event of a merger or consolidation of the Company with or into another
corporation or the sale of all or substantially all of the Company's assets in
which the successor corporation does not assume outstanding options or issue
equivalent options, the Board of Directors of the Company is required to provide
accelerated vesting of outstanding options. See "Description of Capital
Stock--Preferred Stock," "--Anti-takeover Provisions" and "--Limitation of
Director Liability."
 
   
     Control By Management and Existing Stockholders.  Upon completion of this
offering, the Company's executive officers, directors and affiliated entities
together will beneficially own approximately 63.2% of the outstanding shares of
Common Stock (60.8% if the Underwriters' over-allotment option is exercised in
full). As a result, these stockholders, acting together, will be able to control
matters requiring approval by the stockholders of the Company, including the
election of directors. Such a concentration of ownership may have the effect of
delaying or preventing a change in control of the Company, including
transactions in which stockholders might otherwise receive a premium for their
shares over then current market prices. See "Principal Stockholders."
    
 
     Dilution.  Purchasers of the shares of Common Stock offered hereby will
experience immediate and substantial dilution in the net tangible book value of
their investment from the initial offering price. Additional dilution will occur
upon exercise of outstanding options. See "Dilution" and "Shares Eligible for
Future Sale."
 
                                       13
<PAGE>   16
 
                                USE OF PROCEEDS
 
   
     The net proceeds to the Company from the sale of the 2,000,000 shares of
Common Stock offered by the Company are estimated to be approximately $18.1
million ($20.9 million if the Underwriters' over-allotment option is exercised
in full), based on an initial offering price of $10.00 per share and after
deducting underwriting discounts and commissions and estimated offering
expenses. The Company intends to use approximately $12 million of the net
proceeds of this offering for marketing expenses associated with new product
introduction and the establishment of its sales and marketing capabilities,
including development of a dental pharmaceutical sales force, approximately $5
million for pharmaceutical development and the remainder for general corporate
purposes, including working capital. The amounts actually expended for specific
purposes may vary significantly depending upon numerous factors, including the
timing of the regulatory approval of Periostat, if any, the size and type of
sales force to be established, the terms of agreements entered into with
corporate partners, if any, and the results of research and development and
pre-clinical and clinical studies for other applications of the Company's core
technology, as well as technological advances by others and the status of
competitive products. The proceeds of this offering also may be used to license
or acquire technologies or products that complement the Company's focus on
dental pathologies, although the Company is not currently involved in
negotiations with respect to any such transactions.
    
 
     Pending such uses, the Company intends to invest the net proceeds of this
offering in short-term, investment-grade, interest-bearing instruments. The
Company has not and does not propose to engage in activities in a manner or to
an extent which would require it to register as an investment company under the
Investment Company Act of 1940.
 
                                DIVIDEND POLICY
 
     The Company has never declared or paid any dividends on its capital stock.
The Company intends to retain any earnings to fund future growth and the
operation of its business and, therefore, does not anticipate paying any cash
dividends in the foreseeable future.
 
                                       14
<PAGE>   17
 
                                 CAPITALIZATION
 
   
     The following table sets forth the capitalization of the Company: (i) as of
March 31, 1996; (ii) on a pro forma basis to give effect to the conversion of
all outstanding shares of Redeemable Preferred Stock into 5,199,124 shares of
Common Stock; and (iii) on a pro forma as adjusted basis to give effect to the
sale by the Company of 2,000,000 shares of Common Stock offered hereby at an
initial offering price of $10.00 per share, after deducting the underwriting
discounts and commissions and estimated offering expenses payable by the Company
and the application of the estimated net proceeds therefrom.
    
 
   
<TABLE>
<CAPTION>
                                                                    AS OF MARCH 31, 1996
                                                             -----------------------------------
                                                                                     PRO FORMA
                                                              ACTUAL    PRO FORMA   AS ADJUSTED
                                                             --------   ---------   ------------
                                                                           (IN
                                                                        THOUSANDS)
<S>                                                          <C>        <C>         <C>
Long-term debt.............................................  $  --      $  --         $ --
Mandatorily redeemable convertible preferred stock at
  redemption value (which includes accreted dividends of
  $2,260,343); $0.01 par value, 10,850,000 shares
  authorized, 10,398,248 shares issued and outstanding
  (none authorized on a pro forma basis)...................    19,291      --           --
Stockholders' equity (deficit):
  Preferred stock, $0.01 par value, none authorized
     (5,000,000 shares authorized on a pro forma basis);
     none issued and outstanding on an actual, pro forma
     and pro forma as adjusted basis.......................     --         --           --
  Common stock, $0.01 par value, 6,725,000 shares
     authorized (25,000,000 shares authorized on a pro
     forma basis); 315,159, 5,514,283 and 7,514,283 shares
     issued and outstanding on an actual, pro forma and pro
     forma as adjusted basis, respectively(1)..............         3         55            75
  Additional paid-in capital (deficit).....................    (1,765)    17,474        35,554
  Deferred compensation....................................      (300)      (300 )        (300)
  Deficit accumulated during development stage.............   (13,154)   (13,154 )     (13,154)
                                                             --------   --------      --------
       Total stockholders' equity (deficit)................   (15,216)     4,075        22,175
                                                             --------   --------      --------
          Total capitalization.............................  $  4,075   $  4,075      $ 22,175
                                                             ========   ========      ========
</TABLE>
    
 
- ---------------
(1) Excludes options to purchase 288,500 shares of Common Stock issuable under
    the Company's 1992 Stock Option Plan (the "1992 Plan") upon the exercise of
    stock options outstanding as of March 31, 1996 at a weighted average
    exercise price of $0.99 per share, of which options to purchase 66,837
    shares of Common Stock are exercisable. See "Management--Stock Option
    Plans."
 
                                       15
<PAGE>   18
 
                                    DILUTION
 
   
     The pro forma net tangible book value of the Company as of March 31, 1996
was approximately $4.1 million, or $0.74 per share of Common Stock. "Pro forma
net tangible book value per share" is equal to the Company's total tangible
assets less total liabilities, divided by the number of shares of Common Stock
outstanding, and gives effect to the conversion into Common Stock of all shares
of Redeemable Preferred Stock outstanding at March 31, 1996. After giving effect
to the sale by the Company of 2,000,000 shares of Common Stock in this offering
(at the initial offering price and after deducting underwriting discounts and
commissions and estimated offering expenses), the pro forma net tangible book
value of the Company as of March 31, 1996 would have been $22.2 million, or
$2.95 per share of Common Stock. This represents an immediate increase in net
tangible book value per share of $2.21 to existing stockholders and immediate
dilution in net tangible book value of $7.05 per share to new investors. The
following table illustrates the per share dilution:
    
 
   
<TABLE>
<S>                                                                         <C>       <C>
Public offering price per share...........................................            $ 10.00
  Pro forma net tangible book value per share at March 31, 1996...........  $ 0.74
  Increase per share attributable to new investors........................    2.21
                                                                             -----
Pro forma net tangible book value per share after the offering(1).........               2.95
                                                                                       ------
Net tangible book value dilution per share to new investors...............            $  7.05
                                                                                       ======
</TABLE>
    
 
     The following table summarizes, on a pro forma basis as of March 31, 1996,
the number of shares of Common Stock purchased from the Company, the total
consideration paid and the average price per share paid by existing stockholders
and by investors purchasing shares offered by the Company hereby:
 
   
<TABLE>
<CAPTION>
                                  SHARES PURCHASED          TOTAL CONSIDERATION
                                ---------------------     -----------------------     AVERAGE PRICE
                                 NUMBER       PERCENT       AMOUNT        PERCENT       PER SHARE
                                ---------     -------     -----------     -------     -------------
<S>                             <C>           <C>         <C>             <C>         <C>
Existing stockholders(1)......  5,514,283       73.4%     $16,596,589       45.4%        $  3.01
New investors.................  2,000,000       26.6       20,000,000       54.6           10.00
                                ---------     -------     -----------     -------
          Total...............  7,514,283      100.0%     $36,596,589      100.0%
                                =========     ======      ============    ======
</TABLE>
    
 
- ---------------
(1) Excludes options to purchase 288,500 shares of Common Stock issuable under
    the 1992 Plan upon the exercise of stock options outstanding as of March 31,
    1996 at a weighted average exercise price of $0.99 per share, of which
    options to purchase 66,837 shares of Common Stock are exercisable.
    Additional dilution will occur upon exercise of outstanding options. In
    addition, an aggregate of 859,000 shares of Common Stock will be available
    for issuance pursuant to the 1996 Stock Plan (the "1996 Stock Plan") and the
    1996 Non-Employee Director Stock Option Plan (the "Non-Employee Director
    Plan"). See "Management--1996 Non-Employee Director Stock Option Plan" and
    "--Stock Option Plans."
 
                                       16
<PAGE>   19
 
                            SELECTED FINANCIAL DATA
 
     The selected financial data set forth below with respect to the Company's
statement of operations data for the three years ended December 31, 1995 and
with respect to the balance sheet data at December 31, 1994 and 1995 are derived
from and are qualified by reference to the audited financial statements and the
related notes thereto included elsewhere in this Prospectus. The statement of
operations data for the period from January 10, 1992 (inception) to December 31,
1992 are derived from audited financial statements not included in this
Prospectus. The selected financial data as of March 31, 1996, for the three
months ended March 31, 1995 and 1996 and for the period from January 10, 1992
(inception) to March 31, 1996 have been derived from the unaudited financial
statements of the Company, which are included elsewhere in this Prospectus. The
unaudited financial data include all adjustments consisting only of normal,
recurring adjustments that the Company considers necessary for fair presentation
of the financial position and results of operations for these periods. The
results of operations for the three months ended March 31, 1996 are not
necessarily indicative of the results for any future period or for the full year
ended December 31, 1996. The following should be read in conjunction with the
financial statements and notes thereto and "Management's Discussion and Analysis
of Financial Condition and Results of Operations" appearing elsewhere in this
Prospectus:
 
   
<TABLE>
<CAPTION>
                                                                                THREE MONTHS
                              PERIOD FROM                                           ENDED             FOR THE PERIOD
                           JANUARY 10, 1992     YEARS ENDED DECEMBER 31,          MARCH 31,          JANUARY 10, 1992
                            (INCEPTION) TO     ---------------------------   -------------------        (INCEPTION)
                           DECEMBER 31, 1992    1993      1994      1995      1995        1996       TO MARCH 31, 1996
                           -----------------   -------   -------   -------   -------     -------     -----------------
                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                        <C>                 <C>       <C>       <C>       <C>         <C>         <C>
STATEMENT OF OPERATIONS
  DATA:
  Revenues...............       $    --        $    --   $    --   $    --   $    --     $    --          $    --
  Operating expenses:
    Research and
      development........         1,131          1,913     1,928     3,635     1,090         976            9,583
    General and
      administrative.....           333            613       793     1,548       242         418            3,705
                                 ------         ------    ------    ------    ------      ------           ------
  Operating loss.........        (1,464)        (2,526)   (2,721)   (5,183)   (1,332)     (1,394)         (13,288)
  Net loss...............        (1,416)        (2,483)   (2,653)   (5,269)   (1,343)     (1,333)         (13,154)
  Net loss allocable to
    common stockholders..        (1,607)        (2,834)   (3,229)   (6,028)   (1,487)     (1,716)         (15,414)
Pro forma(2):
  Net loss per
    share(1).............                                          $ (1.10)              $ (0.24)
  Shares used in
    computing pro forma
    net loss per share...                                            4,808                 5,546
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                     AS OF
                                                                                  DECEMBER 31,             AS OF
                                                                              --------------------       MARCH 31,
                                                                               1994         1995           1996
                                                                              -------     --------       ---------
                                                                                         (IN THOUSANDS)
<S>                                                                           <C>         <C>            <C>
BALANCE SHEET DATA:
  Cash and cash equivalents.................................................  $   617     $  5,806        $ 4,968
  Total assets..............................................................      628        5,840          5,077
  Mandatorily redeemable convertible preferred stock........................    7,510       18,908         19,291
  Deficit accumulated during development stage..............................   (6,552)     (11,820)       (13,154)
  Total stockholders' equity (deficit)......................................   (7,581)     (13,581)       (15,216)
</TABLE>
    
 
- ---------------
(1) See Note 2 of Notes to Financial Statements for information concerning
    computation of pro forma net loss per share.
 
(2) Gives effect to the conversion of all issued and outstanding shares of
    Redeemable Preferred Stock into 5,199,124 shares of Common Stock.
 
                                       17
<PAGE>   20
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     This Prospectus contains forward-looking statements that involve risks and
uncertainties. The Company's actual results may differ significantly from the
results discussed in the forward-looking statements. Factors that might cause
such differences include those discussed in "Risk Factors."
 
OVERVIEW
 
     The Company began operations in January 1992 and is engaged in the
development and commercialization of innovative, proprietary medical therapies
for the treatment of periodontal disease and other dental pathologies. Since
inception, the Company has had no revenues and has funded its operations
primarily through the issuance of Common Stock and Redeemable Preferred Stock
aggregating $16.6 million. Substantially all of the Company's expenditures to
date have been for pharmaceutical development activities and general and
administrative expenses.
 
     The Company's core technology was developed at SUNY. In 1985, SUNY granted
certain rights to Johnson & Johnson ("J&J") to license such technology. Over the
next several years, J&J conducted and funded Phase I and II clinical trials on
Periostat. Following a strategic decision by J&J not to pursue the dental
pharmaceutical business, in January 1992 J&J assigned to the Company its rights
to the technology, including the rights to Periostat. The Company has completed
Phase III clinical trials on Periostat and plans to submit a NDA to the FDA
during 1996.
 
     Since inception, the Company has operated with a minimal number of
employees. Substantially all pharmaceutical development activities, including
clinical trials, have been contracted to independent contract research and other
organizations. The Company anticipates that it will significantly increase the
number of its employees over the next several years, primarily in the selling,
general and administrative areas, in anticipation of regulatory approval and
market commercialization of Periostat.
 
     The Company does not expect to generate any revenues from product sales for
several years. No assurance can be given, however, that product sales will be
achieved for several years or at all. Successful future operations will depend
on the Company's ability to develop, obtain regulatory approval for and
commercialize its products.
 
     The Company has incurred losses each year since inception and had an
accumulated deficit of $13.2 million at March 31, 1996. The Company expects to
continue to incur losses over the next several years from expenditures on
clinical, product development, marketing and administrative activities.
 
RESULTS OF OPERATIONS
 
     From inception through March 31, 1996, the Company had no revenues.
Operating expenses consist of research and development expenses and general and
administrative expenses. Research and development expenses consist primarily of
funds paid to contract research organizations for the provision of services and
materials for clinical trials and, to a lesser extent, for research grants paid
to SUNY and other research institutions. General and administrative expenses
consist primarily of personnel salaries and benefits, professional and
consulting fees, facilities and general office expenses. The Company anticipates
that selling, general and administrative expenses will increase during the next
several years due to the expansion of its corporate infrastructure, primarily in
sales, marketing and finance.
 
     Three Months Ended March 31, 1996 and March 31, 1995
 
     Research and development expenses decreased from $1.1 million for the three
months ended March 31, 1995 to $1.0 million for the three months ended March 31,
1996. This decrease resulted
 
                                       18
<PAGE>   21
 
primarily from lower expenses for the data compilation and statistical analyses
of the results of the Phase III clinical trials on Periostat.
 
     General and administrative expenses increased from $0.2 million for the
three months ended March 31, 1995 to $0.4 million for the three months ended
March 31, 1996. This increase was due primarily to higher employee compensation
expense, including a non-cash compensation charge of approximately $0.1 million
resulting from the grant of certain employee stock options and to higher
consulting and legal expenses.
 
     Years Ended December 31, 1995 and December 31, 1994
 
     Research and development expenses increased from $1.9 million in 1994 to
$3.6 million in 1995, primarily due to higher costs associated with completing
the Phase III clinical trials on Periostat, including extensive data compilation
and statistical analysis of such data.
 
     General and administrative expenses increased from $0.8 million in 1994 to
$1.5 million in 1995, primarily due to an increase in the number of employees,
higher facilities expenses resulting from the Company's relocation in the fourth
quarter of 1994 and higher legal and accounting fees in 1995.
 
     Years Ended December 31, 1994 and December 31, 1993
 
     Research and development expenses remained consistent at $1.9 million in
1993 and 1994. Contract research expenses for clinical trials increased from
1993 to 1994, which were offset by a decline in both patent expenses and the
costs of producing materials for the clinical trials.
 
     General and administrative expenses increased from $0.6 million in 1993 to
$0.8 million in 1994, primarily due to higher personnel expenses resulting from
the hiring of new employees during 1994 and higher professional and consulting
fees.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     Since its inception in January 1992, the Company has financed its
operations primarily through private placements of Redeemable Preferred Stock
and Common Stock totalling $16.6 million. At March 31, 1996, the Company's cash
and cash equivalents aggregated $5.0 million. The Company's working capital at
March 31, 1996 was $4.0 million, a decrease of $1.3 million from December 31,
1995.
 
     The Company had no debt outstanding (other than accounts payable and
accrued expenses) at March 31, 1996 and December 31, 1995. The Company has no
lines of credit.
 
     From inception through March 31, 1996, the Company expended approximately
$39,000 in capital expenditures. The Company had no capital leases outstanding
at March 31, 1996. Although the Company anticipates higher levels of equipment
and facilities-related expenditures in the foreseeable future, such future
expenditures are not anticipated to be material.
 
     The Company expects that the proceeds from this offering, together with the
Company's existing capital resources, will be adequate to fund the Company's
operations through at least 1997. The Company's future capital requirements and
the adequacy of its available funds will depend on many factors, including the
timing of the Company's NDA submission on Periostat to the FDA, regulatory
approval for Periostat, if any, the size and type of sales force to be
established, the terms of agreements entered into with corporate partners, if
any, and the results of research and development and pre-clinical and clinical
studies for other applications of the Company's core technology.
 
                                       19
<PAGE>   22
 
ACCOUNTING FOR EMPLOYEE STOCK OPTIONS
 
     In October 1995, the Financial Accounting Standards Board issued Statement
of Accounting Standards No. 123, "Accounting for Stock-Based Compensation,"
which established financial accounting and reporting standards for stock based
employee compensation plans. Companies are encouraged, but not required, to
adopt a new method that accounts for stock compensation awards based on their
fair value using an option pricing model. Companies that adopt this new standard
are required to make pro forma disclosures of net income as if the fair
value-based method of accounting required by this standard had been applied. The
requirements of this standard are effective for fiscal year 1996. The Company
expects to adopt the pro forma disclosure requirements. The adoption of such pro
forma disclosure requirements is not expected to have a material impact on the
Company's future financial position or results of operations.
 
                                       20
<PAGE>   23
 
                                    BUSINESS
 
OVERVIEW
 
     CollaGenex Pharmaceuticals is engaged in the development and
commercialization of innovative, proprietary medical therapies for the treatment
of periodontal disease and other dental pathologies. The Company believes that
its initial drug, Periostat, will be the first orally administered, systemically
delivered pharmaceutical to treat periodontitis. Unlike existing treatments,
which focus on the bacterial infection associated with periodontitis, Periostat
inhibits the chronic progressive tissue degradation characteristic of the
disease. The Company has completed three pivotal Phase III clinical trials on
Periostat and plans to submit a NDA for Periostat during 1996. Based on these
clinical trials, the Company believes that Periostat is a safe, efficacious,
cost-effective therapy for the long-term treatment of periodontitis.
 
     Existing therapies and those treatments known to be under development for
periodontitis are designed primarily to treat the bacterial infection associated
with periodontitis on a short-term, periodic basis. These treatments include
mechanical and surgical techniques, prophylactic approaches, such as
mouthwashes, and locally-delivered pharmaceutical therapies. The Company
believes, however, that periodic treatments designed solely to fight bacterial
infection are inadequate and that such treatments would be considerably more
effective if augmented by a long-term pharmaceutical therapy, such as Periostat,
which inhibits connective tissue destruction.
 
     The Company's core technology involves inhibiting the activity of certain
enzymes that destroy the connective tissues of the body. Connective tissues are
components of the body that form the structural basis for skin, bone, cartilage
and ligaments. In addition to periodontal disease, this core technology may be
applicable to other diseases and conditions characterized by the progressive
destruction of connective tissues of the body. The Company's core technology is
licensed on an exclusive basis from SUNY.
 
INDUSTRY BACKGROUND
 
     Periodontitis is a chronic disease characterized by the progressive loss of
attachment between the periodontal ligament and the surrounding alveolar bone,
ultimately resulting in tooth loss. According to industry data, in the United
States alone, an estimated one-third of all adults, or 67 million people, suffer
from some form of periodontitis. The cost of treating periodontitis can be
considerable due to the frequent treatments required. Approximately 13 million
people seek professional treatment annually for periodontal disease, resulting
in over 17 million periodontal procedures and annual expenditures of
approximately $6 billion.
 
     The primary treatment for periodontal disease is mechanical intervention,
known as scaling and root planing ("SRP"), in which bacterial plaque is removed
from the supra- and sub-gingival tooth surfaces (above and below the gumline)
using a metal scraper or ultrasound scaling device. Alternatively, in more
severe periodontal disease, the gums are partially removed by a surgical
procedure to reduce pocket depth around the tooth and to improve the
effectiveness of home oral hygiene techniques. These treatments are designed to
treat bacterial infection associated with periodontitis on a short-term,
periodic basis and are performed by both periodontists and general dentists.
 
     As a result of the chronic nature of periodontitis and the short-term
nature of existing therapies, patients require frequent treatments. In addition,
patients are commonly referred to a specialist for such treatments. Periodontal
disease is, therefore, among the more expensive dental pathologies to treat, and
the Company believes that the treatment of periodontitis will be increasingly
important to dental managed care organizations ("DMOs") and dental practitioners
operating under capitated or fixed fee arrangements. The Company also believes
that Periostat is well positioned to meet the economic and therapeutic
requirements of such DMOs and dental practitioners by providing a cost-effective
therapy for periodontal disease management.
 
                                       21
<PAGE>   24
 
     Increased competition within the dental profession has created rapid
adoption of new technologies. The Company believes that a new safe, painless,
efficacious and cost-effective treatment will facilitate efforts by
periodontists and dentists to attract and retain patients with periodontal
disease.
 
STRATEGY
 
     The Company's primary objective is to become a leading provider of
innovative medical therapies for the treatment of periodontal disease and other
dental pathologies. The Company is pursuing the following strategy to achieve
this objective:
 
     Develop Market Acceptance of Periostat.  The Company will seek to gain
broad market acceptance of Periostat as a safe, painless, efficacious and
cost-effective therapy for periodontitis among periodontists, general dentists,
third-party payors and patients. The Company plans to implement educational and
awareness campaigns through the dissemination of scientific, clinical and
patient outcomes data on Periostat. In addition, the Company intends to seek
American Dental Association ("ADA") endorsement of Periostat.
 
     Establish a Sales and Marketing Organization.  The Company intends to
establish a dedicated dental sales force to market Periostat to DMOs in the
United States. The Company also plans to market Periostat to both periodontists
and general dentists in the United States through one or more of a direct sales
force, independent sales representatives or a strategic partner. In addition,
the Company intends to establish a network of sub-licensees or distributors to
market and sell Periostat outside of the United States.
 
     Build Relationships with DMOs.  The Company intends to establish
relationships with selected DMOs by demonstrating the potential long-term
savings that could result from more effective disease management through the use
of Periostat, including early intervention for mild-to-moderate periodontitis.
The Company believes that acceptance by DMOs of Periostat as a cost-effective
therapy for the treatment of periodontal disease will offer a platform for
practitioner education and influence general acceptance by dental practitioners.
 
     Acquire Complementary Technologies and Products.  The Company is actively
seeking to broaden its dental product line by in-licensing or acquiring
high-quality diagnostic and therapeutic dental products complementary to
Periostat. This would enable the Company to provide an integrated dental product
line and leverage the Company's sales and marketing organization. In March 1996,
the Company licensed on an exclusive, worldwide basis a proprietary formulation
to treat gingivitis, a disease characterized by inflammation of the gums.
 
     Leverage Core Technology Through Strategic Partnering Arrangements.  The
Company intends to develop and commercialize non-dental therapeutic applications
of its core technology through the establishment of corporate partnering
arrangements. The Company has initiated a collaboration with the National Cancer
Institute relating to cancer metastasis and has entered into an evaluation
agreement relating to wound healing with Smith & Nephew Research Limited, a
major U.K.-based wound treatment company.
 
PERIOSTAT
 
     The Company's primary focus to date has been on the development of
Periostat, which the Company believes will be the first orally administered,
systemically delivered pharmaceutical to treat adult periodontitis. Periostat, a
20mg dose of doxycycline, is a unique sub-antibiotic dosage strength that
inhibits the chronic progressive tissue degradation characteristic of
periodontal disease without exerting any anti-microbial effect. Periostat is
intended to be taken orally by the patient, on an extended basis, between dental
visits. Doxycycline is an active ingredient of several FDA-approved drugs and
has been in use for approximately 30 years for the treatment of microbial
infections and, along with other tetracyclines, has a well established safety
record. The Company has completed three pivotal Phase III clinical trials on
Periostat and plans to submit a NDA for Periostat
 
                                       22
<PAGE>   25
 
during 1996. Based on these clinical trials, the Company believes that Periostat
is a safe, efficacious, cost-effective therapy for the long-term treatment of
periodontitis.
 
     The Company's Phase III clinical trials consisted of three parallel,
separate, multi-centered, placebo-controlled, double-blinded clinical trials in
patients with adult periodontal disease. A total of 436 patients were enrolled
in the three clinical trials at 11 dental schools across the United States.
These clinical trials were managed by an independent contract research
organization and were conducted over a 12-month period. In each trial, patients
were randomly assigned into groups that were administered Periostat or placebo
capsules. At the outset of these trials, baseline measurements were taken of
each of the clinical endpoints to be studied and each patient received a dental
cleaning. Subsequent measurements were obtained at regular intervals and an
additional dental cleaning was carried out after six months. Data were analyzed
using conventional statistical techniques to establish whether significant
differences existed between the Periostat-dosed groups and those receiving
placebo by comparing data obtained at 12 months with baseline measurements. A
confidence level of not less than 95% was used to establish whether
statistically significant differences existed in clinical endpoints.
 
     The primary clinical endpoint of the clinical trials was the measurement of
changes in clinical attachment level ("ALv"), a parameter defining the integrity
of the connective tissue that anchors the tooth to the alveolar bone. This
endpoint is the one most often recognized by the FDA to determine the validity
of a claim for therapy of periodontal disease. The Company utilized two
independent techniques in the clinical trials to measure ALv, manual probing and
automated probing. Using the manual probing technique, ALv was measured at six
separate probing sites around each tooth, regardless of whether disease was
present or active. Therefore, in a typical mouth with 30 teeth, approximately
180 probing sites were measured. In contrast, using the automated probing
technique, ALv was measured at only a subset of probing sites that exhibited
active moderate-to-severe disease at the outset of the study.
 
     Each of the Phase III clinical trials demonstrated statistically
significant improvements in ALv. The data observed using the manual probing
technique revealed that the Periostat group exhibited an average improvement in
ALv of 40% and 21% in probing sites with mild-to-moderate disease and severe
disease, respectively, when compared with the placebo group. Similarly, the data
from the subset of probing sites with active moderate-to-severe disease measured
with the automated probe revealed that the Periostat group exhibited a greater
than three-fold improvement in ALv when compared with the placebo group.
 
     Another significant primary clinical endpoint, the percentage of all
probing sites that deteriorated by a clinically significant threshold of change,
was studied using only the manual probe. Periostat was found to reduce the
percentage of probing sites that deteriorated by a clinically significant
amount. In addition, in those probing sites with normal attachment level,
mild-to-moderate periodontal disease and severe periodontal disease, Periostat
reduced the progression of the disease by 32%, 46% and 55%, respectively.
 
     Several other secondary clinical endpoints were measured and analyzed using
the manual probing technique during the course of the Company's Phase III
clinical trials. These included probing pocket depth (the distance from the
gumline to the base of the periodontal pocket), the extent to which the gums
bled when the periodontal pocket was probed (a common screen for the severity of
periodontal disease) and the loss of alveolar bone (measured using a complex
x-ray technique known as digital subtraction radiography). All of these
secondary clinical endpoints generally exhibited statistically significant
improvements in each of the three clinical trials and in the combined data.
 
     A further subset of the trials involved the measurement of ALv following
SRP. SRP was conducted during the course of the study on certain probing sites
exceeding a pre-defined threshold of attachment loss. Analysis of the data
derived from this subset demonstrated that the placebo group required SRP on
five times as many probing sites as the group receiving Periostat. Furthermore,
the
 
                                       23
<PAGE>   26
 
combination of SRP with Periostat exhibited a greater than three-fold
improvement in ALv when compared to SRP alone. This finding is being further
evaluated by the Company in additional clinical studies.
 
     The Company's three pivotal Phase III clinical trials were completed in
December 1994. Since that time, the Company has been compiling the data,
performing statistical analysis and conducting the additional testing necessary
to complete its NDA for Periostat, which it plans to submit during 1996. There
can be no assurance that the Company's NDA with respect to Periostat will be
submitted in a timely manner or, if so submitted, that it will be approved by
the FDA on a timely basis, or at all. Failure to obtain FDA approval of a NDA
for Periostat would have a material adverse effect on the Company's business,
financial condition and results of operations.
 
TECHNOLOGY
 
     The Company's core technology involves the pharmaceutical modulation of the
activity of a broad class of enzymes known as matrix metalloproteinases
("MMPs"). MMPs are responsible for the normal turnover of collagen and other
proteins that are integral components of a variety of connective tissues such as
skin, bone, cartilage and ligaments.
 
     Under normal physiological conditions, the natural breakdown of collagen is
regulated by the interaction between the degradative properties of MMPs and a
group of naturally occurring biomolecules called tissue inhibitors of
metalloproteinases ("TIMPs"), which modulate the level of MMP activity. In many
pathological conditions, however, the balance between collagen production and
degradation is disrupted resulting in the excessive loss of tissue collagen, a
process called collagenolysis. One such example is the progressive destruction
of the periodontal ligament and alveolar bone in periodontal disease. Similar
degradative activity is associated with other disorders and conditions such as
cancer metastasis, wounds, osteoarthritis, osteoporosis, rheumatoid arthritis
and diabetic nephropathy.
 
     The Company's core technology is licensed on an exclusive basis from SUNY
and results from the research of Drs. Lorne M. Golub and Thomas F. McNamara and
their colleagues at the State University of New York at Stony Brook. These
researchers demonstrated that tetracyclines can significantly reduce the
pathologically excessive collagen degradation associated with periodontal
disease. They also were able to demonstrate that this result was unrelated to
the antibiotic properties of tetracyclines. Furthermore, they demonstrated that
the administration of doses of antibiotic tetracyclines well below the dosage
levels necessary to destroy microbes (sub-antibiotic doses) was still effective
in preventing the loss of connective tissue in models of periodontal disease.
Studies published in scientific journals support the hypothesis that the
mechanism of action for this activity is the result, in part, of the direct
binding of tetracyclines to certain metal binding sites associated with the MMP
structure.
 
     Although commercially available antibiotic tetracyclines show effective
anti-collagenolytic potential, long-term administration of these compounds at
normal antibiotic doses can result in well-known complications of long-term
antibiotic therapy, such as gastrointestinal disturbance, overgrowth of yeast
and fungi, and the emergence of antibiotic-resistant bacteria. The Company's
Phase III clinical trials using Periostat demonstrated that the administration
of sub-antibiotic doses of doxycycline over a 12-month period exerted no
anti-microbial effects. Thus, the use of this dosage strength provides the
anti-collagenolytic effects without the complications of long-term antibiotic
therapies.
 
     The Company's license from SUNY also covers a broad class of tetracyclines
that have been chemically modified to retain and enhance their
anti-collagenolytic properties but which have had the structural elements
responsible for their antibiotic activity removed ("CMTs"). These compounds,
which lack any antibiotic activity, have shown potential in a number of
pre-clinical models of excessive connective tissue breakdown. The Company's
current research and development programs are focused on the use of CMTs in drug
therapies for potential applications where more
 
                                       24
<PAGE>   27
 
potent doses of tetracyclines may enhance the efficacy of the treatment. See
"-- Other Potential Applications."
 
OTHER POTENTIAL APPLICATIONS
 
     The Company's research and discoveries relating to CMTs have yielded other
potential therapeutic programs which the Company intends to develop and
commercialize through the establishment of corporate partnering arrangements.
The Company believes that its core technology may be utilized to develop
therapies for other diseases and conditions which, like periodontal disease, are
characterized by the progressive destruction of connective tissues of the body,
such as cancer metastasis, wounds, osteoarthritis, osteoporosis, rheumatoid
arthritis and diabetic nephropathy.
 
     Cancer Metastasis
 
     Cancer metastasis is the spread of cancer cells from a diseased organ to
the lymphatic or circulatory system, where such cells then migrate throughout
the body causing cancer to develop in other organs. Tumor cell invasion is a
complex process that involves the destruction of the basement membrane, or
structural support tissue, of the lymphatic or circulatory system, and the
migration of tumor cells to secondary sites, followed by proliferation of these
cells. Data from recent pre-clinical studies sponsored by the Company at two
major universities suggest that several of the Company's CMT drug candidates
have potent activity in models of cancer invasion.
 
     These studies also demonstrated that the inhibition of certain MMP activity
by conventional tetracyclines and CMTs results in a decreased ability of tumor
cells to invade the lung in models of metastasis. In addition, CMTs have been
shown to modulate the specific type of MMP isolated from human lung cancer
cells, the activity of which has been correlated with the metastatic potential
of tumors. Pre-clinical studies are in progress in animal models of metastasis,
and initial results suggest that a number of the Company's compounds show
efficacy in these models.
 
     The National Cancer Institute (the "NCI") has informed the Company that it
intends to perform pharmacology, toxicology and Phase I clinical trials using
one of the Company's CMTs for the prevention of cancer metastasis. The Company
currently is negotiating the terms and conditions of a collaborative research
and development agreement with the NCI.
 
     Wound Repair
 
     The repair of the connective tissue in response to acute injury involves
the remodeling of collagen and related proteins. The Company has generated data
in pre-clinical studies conducted at SUNY which suggest the potential utility of
certain of its compounds in facilitating this process. To further explore this
application, the Company has entered into an evaluation agreement with Smith &
Nephew Research Limited ("Smith & Nephew"), a major U.K.-based wound treatment
company, pursuant to which Smith & Nephew will seek to validate the preliminary
efficacy data developed at SUNY in the field of wound repair. The Company has
granted to Smith & Nephew a right of first negotiation with respect to certain
compounds in the field of wound repair.
 
     Osteoarthritis
 
     Osteoarthritis is a progressive, degenerative joint disease involving the
breakdown of the synovial cartilage in the joint. Trauma, resulting in joint
instability, most often is the cause of this disease, which results in the
gradual destruction of bone and especially of collagen. Several pre-clinical
studies carried out by the Company in collaboration with a major teaching
hospital and other institutions have demonstrated that the use of the Company's
compounds inhibit the loss of synovial cartilage in the joint.
 
                                       25
<PAGE>   28
 
     Osteoporosis
 
     Osteoporosis is characterized by reductions in both the amount and strength
of bone tissue due to the loss of calcium from the bone, resulting in
susceptibility to fracture. A pre-clinical study carried out by the Company in
collaboration with a major university demonstrated that many of the Company's
CMTs inhibit bone resorption, or the loss of bone tissue, in various
experimental models.
 
     Rheumatoid Arthritis
 
     Rheumatoid arthritis is a chronic inflammatory joint disease with many
pathophysiological similarities to periodontal disease. Substantial evidence
implicates collagenase, an MMP, as a cause of bone, joint and tissue destruction
in this disease. Several animal studies carried out by the Company and SUNY in
collaboration with a major teaching hospital have demonstrated that the use of
the Company's CMTs significantly reduced radiographic evidence of cartilage and
bone destruction in the joint that correlated with the normalization of MMP
activity.
 
     Diabetic Nephropathy
 
     Nephropathy is one of the most serious secondary complications of diabetes.
This condition results in the progressive loss of kidney function, requiring
dialysis or a kidney transplant to maintain survival, and frequently leads to
end-stage renal disease. The destruction observed in diabetic nephropathy is
associated with elevated levels of MMPs which degrade the basement membrane of
the kidney, causing it to lose its ability to effectively act as a filter. An
early indicator of kidney disease is proteinuria, which is the excretion of
protein in the urine. Animal model studies conducted by SUNY have shown that the
administration of CMTs significantly reduces the severity of proteinuria and the
Company believes such administration reduces the collagenolytic activity in the
glomerulus, which is the structure within the kidney that prevents proteinuria.
 
MARKETING
 
     The Company intends to establish a dedicated dental sales force, with
expertise in sales and third-party reimbursement, to market Periostat to DMOs in
the United States. The Company also plans to market Periostat to both
periodontists and general dentists in the United States through one or more of a
direct sales force, independent sales representatives or a strategic partner. In
addition, the Company intends to establish a network of sub-licensees or
distributors to market and sell Periostat outside of the United States. In order
to provide an integrated dental product line and leverage the Company's sales
and marketing organization, the Company is actively seeking to in-license or
acquire high-quality diagnostic and therapeutic dental products complementary to
Periostat.
 
     The Company plans to implement a broad-based marketing program with special
emphasis on educational programs through the dissemination of scientific,
clinical and patient outcomes data on Periostat and periodontal disease. These
marketing programs will focus on establishing broad market acceptance of
Periostat among periodontists, general dentists, third-party payors and
patients. In addition, the Company intends to seek ADA endorsement of Periostat.
 
     The commercial success of Periostat will be dependent, in part, upon the
availability of government or private third-party reimbursement for the product.
Prior to approving coverage for a new drug product, most third-party payors
require evidence that the product is safe and effective, not experimental or
investigational. The Company believes that third-party reimbursement may be
available for Periostat. The Company, however, currently has no history in
obtaining reimbursement in the United States or other countries.
 
     The Company currently does not have any sales and marketing personnel.
There can be no assurance that the Company will be able to recruit and retain
qualified sales and marketing
 
                                       26
<PAGE>   29
 
personnel, foreign sub-licensees or distributors or marketing partners or that
the Company's marketing and sales efforts will be successful.
 
RESEARCH AND DEVELOPMENT
 
     The Company conducts a broad-based research and drug discovery program
through its collaborations with corporate partners, researchers, universities,
medical institutions and leading scientists. Pharmaceutical development
activities are carried out primarily by contract research organizations at the
direction of the Company. Historically, the Company's research has focused on
the inhibition of collagenolytic activity with particular emphasis on
periodontal disease. The Company maintains an ongoing research relationship with
SUNY relating to tetracyclines, including CMTs, and their effect on connective
tissue disorders. The Company receives certain proprietary rights to inventions
or discoveries that arise as a result of this research. The Company's current
research and development objective is to develop additional products utilizing
its CMT technology. See "--Technology" and "--Other Potential Applications."
 
     The Company has entered into an agreement with a contract research
organization pursuant to which such entity performs a majority of the Company's
clinical development, data management and regulatory affairs activities. Either
party may terminate such agreement on 90 days prior written notice. The
Company's research and development expenditures were approximately $1.9 million,
$1.9 million and $3.6 million in 1993, 1994 and 1995, respectively, and $976,000
for the three months ended March 31, 1996. Of such amounts, $0, $629,000,
$1,679,000 and $450,000 were incurred under this agreement for such periods.
 
MANUFACTURING AND SUPPLIERS
 
     The Company relies on third-party contract manufacturers to produce
doxycycline, the active drug ingredient in Periostat, and for the commercial
manufacturing of Periostat. The Company has entered into a manufacturing
agreement with Applied Analytical Industries, Inc. ("AAI"), in Wilmington, North
Carolina for the manufacture of Periostat. AAI supplies a portion of the
products used in the Company's Phase III clinical trials. This agreement, which
requires the Company to purchase minimum amounts of Periostat, terminates three
years from the date of the initial product launch and automatically extends for
consecutive one-year periods unless 12-month prior written notice is provided
before the expiration of the applicable term. AAI is required to comply with GMP
requirements.
 
     The Company has entered into a supply agreement with Hovione International
Limited ("Hovione") pursuant to which the active ingredient in Periostat,
doxycycline, is supplied by Hovione from its offshore facilities. Hovione
supplies a substantial portion of the doxycycline used in the United States from
two independent, FDA-registered and approved facilities, providing for a back-up
supply in the event that one facility is unable to manufacture. The supply
agreement is in effect until January 25, 2000 and will automatically renew for
successive two-year periods unless, 90 days prior to the expiration of any such
periods, either party gives the other party written notice of termination. In
addition, in the event of a default, uncured for 90 days, the non-defaulting
party can terminate the agreement effective immediately at the end of such
90-day period. The Company relies on Hovione as its sole supplier of
doxycycline.
 
     There can be no assurance that the Company will be able to enter into or
maintain supply or manufacturing agreements on acceptable terms, if at all. In
the event that the Company is unable to obtain sufficient quantities of
doxycycline or Periostat on commercially reasonable terms, or in a timely
manner, or if the Company's suppliers fail to comply with GMP, the Company's
business, financial condition and results of operations would be materially
adversely affected. See "--Government Regulation."
 
                                       27
<PAGE>   30
 
PATENTS, TRADE SECRETS AND LICENSES
 
     The Company's success will depend in part on patent and trade secret
protection for its technologies, products and processes, and on its ability to
operate without infringement of proprietary rights of other parties both in the
United States and in foreign countries. 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.
 
     The Company depends on the SUNY License for all of its core technologies.
The SUNY License grants the Company an exclusive worldwide license to make and
sell products employing tetracyclines that are designed or utilized to alter a
biological process. Eleven U.S. patents and four U.S. patent applications held
by SUNY are licensed to the Company under the SUNY License. The Primary Patent
claims methods of use of conventional tetracyclines to inhibit pathologically
excessive collagenolytic activity, while the Secondary Patent claims methods of
use of tetracyclines which have no antibiotic activity. The nine other U.S.
patents relate to the compositions of certain chemically modified tetracyclines
with anti-collagenolytic properties, methods of use of tetracyclines to reduce
bone loss and methods of use of teracyclines to enhance bone growth. SUNY did
not apply in foreign countries for patents corresponding to the Primary Patent
but has obtained patents that correspond to the Secondary Patent in Australia,
Canada and certain European countries. A patent application corresponding to the
Secondary Patent is pending in Japan. SUNY also has obtained patents in certain
European countries, Canada and Japan and has pending patent applications in
certain other foreign countries which correspond to its U.S. patents relating to
methods of use of tetracyclines to reduce bone loss. All of SUNY's U.S. and
foreign patents expire between 2004 and 2012. The Company's rights under the
SUNY License are subject to certain statutory rights of the U.S. government
resulting from federal support of research activities at SUNY. The failure to
obtain and maintain patent protection may mean that the Company will face
increased competition in the United States and in foreign countries. The SUNY
License is terminable by SUNY on 90 days prior notice only upon the Company's
failure to make timely payments, reimbursements or reports, if the failure is
not cured by the Company within 90 days. The termination of the SUNY License, or
the failure to obtain and maintain patent protection for the Company's
technologies, would have a material adverse effect on the Company's business,
financial condition and results of operations.
 
     One of the U.S. patents and a corresponding Japanese patent application
licensed to the Company under the SUNY License are owned jointly by SUNY and a
Japanese company. These patent rights, which expire in 2012, cover particular
CMTs (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 the Company's
Periostat product but could, in the future, prove to be important for one or
more of the Company's other potential applications of its technology. If the
Company does incorporate the Jointly Owned CMTs in any future product, it may be
precluded from marketing these products in Asia, Australia and New Zealand and
could experience increased competition in other markets from the joint owner.
 
     In consideration of the license granted to the Company, the Company: (i)
issued to SUNY 78,948 shares of Common Stock; and (ii) has agreed to pay SUNY
royalties on the net sales of products employing tetracyclines, with minimum
annual royalty payments per year. The term of the license is: (i) until the
expiration of the last to expire of the licensed patents in each country; or
(ii) until 20 years from the first commercial sale of any collagenase
inhibition-related product by the Company for know-how, at which time the
Company has a fully paid, non-exclusive license.
 
     The Company intends to enforce its patent rights against third-party
infringers. Due to the general availability of generic tetracyclines for use as
antibiotics, the Company could become involved in infringement actions, which
could entail substantial costs to the Company. Regardless of the outcome,
defense and prosecution of patent claims is expensive and time consuming, and
 
                                       28
<PAGE>   31
 
results in the diversion of substantial financial, management and other
resources from the Company's other activities. Although federal law prohibits
the promotion or marketing of pharmaceuticals for unauthorized uses, there can
be no assurance 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.
 
     The patent positions of pharmaceutical firms, including the Company, are
generally uncertain and involve complex legal and factual questions.
Consequently, as to the patent applications licensed to it, even though the
Company currently is prosecuting such patent applications with U.S. and foreign
patent offices, the Company does not know whether any of such applications will
result in the issuance of any additional patents or, if any additional patents
are issued, whether they will provide significant proprietary protection or will
be circumvented or invalidated. Since patent applications in the United States
are maintained in secrecy until patents issue, and since publication of
discoveries in the scientific and patent literature tend to lag behind actual
discoveries by several months, the Company cannot be certain that it was the
first creator of inventions covered by pending patent applications or that it
was the first to file patent applications for such inventions.
 
     There can be no assurance that patent applications to which the Company
holds rights will result in the issuance of patents, that any patents issued or
licensed to the Company will not be challenged and held to be invalid, or that
any such patents will provide commercially significant protection to the
Company's technology, products and processes. In addition, there can be no
assurance that others will not independently develop substantially equivalent
proprietary information not covered by patents to which the Company owns rights
or obtain access to the Company's know-how, or that others will not be issued
patents which may prevent the sale of one or more of the Company's products, or
require licensing and the payment of significant fees or royalties by the
Company to third parties in order to enable the Company to conduct its business.
In the event that any relevant claims of third-party patents are upheld as valid
and enforceable, the Company could be prevented from selling its products or
could be required to obtain licenses from the owners of such patents. There can
be no assurance that such licenses would be available or, if available, would be
on terms acceptable to the Company. The Company's failure to obtain these
licenses would have a material adverse effect on the Company's business,
financial condition and results of operations.
 
     The Company's success also is dependent upon know-how, unpatentable trade
secrets, and the skills, knowledge and experience of its scientific and
technical personnel. The Company requires all employees to enter into
confidentiality agreements that prohibit the disclosure of confidential
information to anyone outside the Company and require disclosure and assignment
to the Company of their ideas, developments, discoveries and inventions. In
addition, the Company seeks to obtain such agreements from its consultants,
advisors and research collaborators. There can be no assurance that adequate
protection will be provided for the Company's trade secrets, know-how or other
proprietary information in the event of any unauthorized use or disclosure. The
Company occasionally provides information and chemical compounds to research
collaborators in academic institutions, and requests that the collaborators
conduct tests in order to investigate certain properties of the compounds. There
can be no assurance 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 the Company on acceptable terms. If the
assertion of intellectual property rights by an academic institution can be
substantiated, failure of the academic institution to grant intellectual
property rights to the Company could have a material adverse effect on the
Company's business, financial condition and results of operations.
 
GOVERNMENT REGULATION
 
     The Company's activities and product candidates are subject to extensive
and rigorous regulation by a number of governmental entities in the United
States, primarily the FDA, and by comparable authorities in other countries.
These governmental entities regulate, among other things, research and
development activities and the testing, manufacture, safety, effectiveness,
 
                                       29
<PAGE>   32
 
labeling, storage, record keeping, approval, advertising, promotion,
distribution and sale of prescription drug products. Different types of FDA
regulation apply to various drug products, depending upon whether they are
marketed only upon the order of a physician (prescription drugs) or
over-the-counter, are biological or antibiotic drugs or are controlled drugs,
such as narcotics. Product development and approval within this regulatory
framework takes a number of years, involves the expenditure of substantial
resources and is uncertain. Many products that initially appear promising
ultimately do not reach the market because they are not found to be safe or
effective, as demonstrated by testing required by government regulation during
the development process. In addition, there can be no assurance that this
regulatory framework will not change or that additional regulation will not
arise at any stage of the Company's product development that may affect
approval, delay an application or require additional expenditure by the Company.
Moreover, even if approval is obtained, failure to comply with present or future
regulatory requirements, or new information adversely reflecting on the safety
or effectiveness of the approved drug, can lead to FDA withdrawal of approval to
market the product. Failure to comply with applicable FDA and other regulatory
requirements can result in sanctions being imposed on the Company or the
manufacturers of its products, including warning letters, product recalls or
seizures, injunctions, refusals to permit products to be imported into or
exported out of the United States, refusals of the FDA to grant pre-market
approval of drugs or to allow the Company to enter into government supply
contracts, withdrawals of previously approved marketing applications and
criminal prosecutions.
 
     The activities required before a new drug product may be marketed in the
United States begin primarily with pre-clinical testing. Pre-clinical tests
include laboratory evaluation of product chemistry and other characteristics and
animal studies to assess the potential safety and efficacy of the product as
formulated. Many pre-clinical studies are regulated by the FDA under Good
Laboratory Practice ("GLP") regulations. Violations of these regulations can, in
some cases, lead to invalidation of the studies, requiring such studies to be
replicated. The Company's pre-clinical studies were conducted in accordance with
GLP regulations.
 
     The entire body of pre-clinical development work necessary to administer
investigational drugs to human volunteers or patients is summarized in an IND
submission to the FDA. FDA regulations provide that human clinical trials may
begin 30 days following submission and receipt of an IND, unless the FDA advises
otherwise or requests additional information, clarification or additional time
to review the IND submission. There is no assurance that the submission of an
IND will eventually allow a company to commence clinical trials. Once trials
have commenced, the FDA may stop the trials, or particular types of trials, by
placing a "clinical hold" on such trials because of concerns about, for example,
the safety of the product being tested or the adequacy of the trial design. Such
holds can cause substantial delay and, in some cases, may require abandonment of
a product. Clinical testing involves the administration of the drug to healthy
human volunteers or to patients under the supervision of a qualified principal
investigator, usually a physician, pursuant to a FDA reviewed protocol. Each
clinical study is conducted under the auspices of independent Institutional
Review Boards ("IRBs") at the institutions at which the study will be conducted.
An IRB will consider, among other things, ethical factors, the safety of human
subjects and the possible liability of the institution. Human clinical trials
typically are conducted in three sequential phases, but the phases may overlap.
Phase I trials consist of testing the product in a small number of patients or
normal volunteers, primarily for safety, in one or more dosages, as well as
characterization of a drug's pharmacokinetic and/or pharmacodynamic profile. In
Phase II, in addition to safety, the efficacy of the product is evaluated in a
patient population. Phase III trials typically involve additional testing for
safety and clinical efficacy and an expanded population at geographically
dispersed sites. A clinical plan, or "protocol," accompanied by the approval of
an IRB, must be submitted to the FDA prior to commencement of each clinical
trial. All patients involved in the clinical trial must provide informed consent
prior to their participation.
 
     A company seeking FDA approval to market a new drug must file a NDA with
the FDA pursuant to the Federal Food, Drug and Cosmetic Act. In addition to
reports of the pre-clinical and clinical
 
                                       30
<PAGE>   33
 
trials conducted under the FDA-approved IND, the NDA includes information
pertaining to the preparation of the drug substance, analytical methods, drug
product formulation, details on the manufacture of finished products as well as
proposed product packaging and labeling. Submission of a NDA does not assure FDA
approval for marketing. The application review process generally takes one to
three years to complete, although reviews of treatments for cancer and other
life-threatening diseases may be accelerated or expedited. However, the process
may take substantially longer if, among other things, the FDA has questions or
concerns about the safety or efficacy of a product. In general, the FDA requires
at least two properly conducted, adequate and well-controlled clinical studies
demonstrating efficacy with sufficient levels of statistical assurance. However,
additional information may be required. For example, the FDA also may request
long-term toxicity studies or other studies relating to product safety or
efficacy. Notwithstanding the submission of such data, the FDA ultimately may
decide that the application does not satisfy its regulatory criteria for
approval. Finally, the FDA may require additional clinical tests following NDA
approval to confirm safety and efficacy (Phase IV clinical trials).
 
     In late 1995, the FDA requested that the Company conduct additional animal
studies regarding certain effects associated with the long-term dosing of
doxycycline and that the data be included in the Company's NDA submission. Such
animal studies currently are being conducted. Any delay in the completion of
such studies would delay the Company's NDA submission and any such delay, if
extended, could have a material adverse effect on the Company's business,
financial condition and results of operations. The FDA also requested that a
post-approval, post-marketing animal study related to long-term dosing be
conducted.
 
     The FDA may, in some circumstances, impose restrictions on the use of a
drug, which restrictions may be difficult and expensive to administer. Product
approvals may be withdrawn if compliance with regulatory requirements is not
maintained or if problems occur after the product reaches the market. After a
product is approved for a given indication in a NDA, subsequent new indications
or dosages for the same product are reviewed by the FDA by the filing of a NDA
supplement. The NDA supplement is much more focused than the NDA and deals
primarily with safety and effectiveness data related to the indication or
dosage, and labeling information for the new indication. Finally, the FDA
requires reporting of certain information that becomes known to a manufacturer
of an approved drug.
 
     The FDA does not permit a manufacturer or distributor to market or promote
an approved drug product for an unapproved "off label" use or dosage level.
Therefore, any company that markets or promotes doxycycline for use in the
treatment of adult periodontitis in an unapproved dosage level (for example, a
50mg scored tablet) without first obtaining FDA approval for such use and dosage
would be subject to regulatory action. Generally, the FDA, under its "practice
of medicine" policy, does not prohibit a physician, dentist or other licensed
practitioner from prescribing an approved drug product for an unapproved use or
dosage. Nor does the FDA generally regulate the practice of pharmacy where the
pharmacist fills a prescription issued by a licensed practitioner for an
individual patient. There can be no assurance that the FDA or a state agency
regulating the practice of medicine would initiate regulatory action against a
licensed practitioner for prescribing doxycycline in the currently available
dosage for use in the treatment of adult periodontitis.
 
     The Drug Price Competition and Patent Term Restoration Act of 1984 provides
for abbreviated approval requirements for generic drugs, exclusivity protection
for innovative products that prevents FDA approval of generic versions, and
patent extension for a certain period of time that it takes to obtain FDA
approval. The Company believes that Periostat will be treated by the FDA as a
"new drug," rather than as an "antibiotic," primarily because the drug currently
is under review by the Division of Dermatological and Dental Drug Products, not
by the Division of Anti-Infective Drug Products. Therefore, Periostat may be
entitled to a three-year period of marketing exclusivity before generic versions
can be approved by the FDA for commercial sale if the Company is first in
obtaining FDA marketing approval for an oral dosage form containing 20mg of
doxycycline for the treatment of adult periodontitis and the FDA determines that
the clinical investigations conducted by or for the
 
                                       31
<PAGE>   34
 
Company are essential to approval of the marketing application. There can be no
assurance, however, that Periostat will not be treated by the FDA as an
"antibiotic" or that the Company will be able to satisfy the other criteria for
obtaining three-year marketing exclusivity, in which case no exclusivity period
or patent-term extension will be available. In this case, the Company would have
to rely solely on its patent protection. In addition, the Company will be
subject to certain user fees that the FDA is authorized to collect under the
Prescription User Fees Act of 1992 for reviewing NDAs and other marketing
applications.
 
     Among the requirements for product approval is the requirement that the
prospective manufacturer conform to GMP regulations. In complying with the GMP
regulations, manufacturers must continue to expend time, money and effort in
product, record-keeping and quality control to assure that the product meets
applicable specifications and other requirements. The FDA periodically inspects
manufacturing facilities in the United States in order to assure compliance with
applicable GMP requirements. Foreign manufacturers also are inspected by the FDA
if their drugs are marketed in the United States. Failure of the Company's
foreign supplier of the active ingredient used in the manufacture of the
Company's products or failure of the Company's manufacturer of its finished
dosage form products to comply with the GMP regulations or other FDA regulatory
requirements would have a material adverse effect on the Company's business,
financial condition or results of operations.
 
     The product testing and approval process is likely to take a substantial
number of years and involves expenditure of substantial resources. There can be
no assurance that any approval will be granted on a timely basis, or at all. The
FDA also may require post-marketing testing and surveillance to monitor the
record of the product and continued compliance with regulatory requirements.
Upon approval, a prescription drug may only be marketed for the approved
indications in the approved dosage forms and at the approved dosage. Adverse
experiences with the product must be reported to the FDA.
 
     In addition to the applicable FDA requirements, the Company is subject to
foreign regulatory authorities governing clinical trials and drug sales. Whether
or not FDA approval has been obtained, approval of a pharmaceutical 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 the time required may be
longer or shorter than that required for FDA approval.
 
COMPETITION
 
     The pharmaceutical industry is subject to intense competition as well as
rapid and significant technological change. While the Company believes that
there are no other products for the treatment of periodontal disease which
operate through systemic delivery of therapeutics designed to reduce connective
tissue destruction, the Company is aware of companies that have developed or are
developing products that may compete in the same market. The Company believes
that a significant competitive factor is the relative speed with which the
Company can complete the approval process and, if Periostat is approved, supply
commercial quantities of the product to the market. In addition, the Company
expects that competition in the periodontal area will be based on other factors,
including product efficacy, safety, cost-effectiveness, ease of use, patient
discomfort, availability, price and patent position.
 
     Many of the Company's potential competitors have substantially greater
financial, technical and human resources than the Company and may be better
equipped to develop, manufacture and market products. These companies may
develop and introduce products and processes competitive with or superior to
those of the Company.
 
                                       32
<PAGE>   35
 
EMPLOYEES
 
     The Company historically has relied upon consultants to perform many of its
operating activities and has outsourced its manufacturing, clinical trials, NDA
preparation and other activities. As of March 31, 1996, the Company employed
five persons. Each of its management personnel has had prior experience with
pharmaceutical, biotechnology or medical products companies. The Company intends
to increase its sales and marketing staff and to continue to outsource many of
the activities which it historically has outsourced. None of the Company's
employees are covered by collective bargaining agreements. All of the Company's
employees are covered by confidentiality agreements. The Company considers
relations with its employees to be excellent. See "Management -- Indemnification
Agreements and Non-Competition, Non-Disclosure and Invention Assignment
Agreements."
 
PROPERTIES
 
     The Company owns no real property. The Company leases 2,700 square feet of
office space in Newtown, Pennsylvania. The Company's facility contains all of
its executive and administrative offices. This lease expires on December 31,
1996.
 
LEGAL PROCEEDINGS
 
     The Company is not a party to any legal proceedings.
 
                                       33
<PAGE>   36
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
     The executive officers and directors of the Company are as follows:
 
<TABLE>
<CAPTION>
               NAME                    AGE                           POSITION
               ----                    ---                           --------
<S>                                    <C>       <C>
Helmer P.K. Agersborg, Ph.D........    67        Chairman of the Board
Brian M. Gallagher, Ph.D...........    48        President, Chief Executive Officer and Director
Robert A. Ashley...................    38        Vice President, Commercial Development
Nancy C. Broadbent.................    41        Chief Financial Officer, Treasurer and Secretary
Robert J. Easton(1)................    51        Director
James E. Daverman(2)...............    46        Director
Stephen W. Ritterbush, Ph.D.(1)(2)...  49        Director
Pieter J. Schiller(2)..............    58        Director
Terence E. Winters, Ph.D.(1).......    54        Director
</TABLE>
 
- ---------------
(1) Member of Compensation Committee.
(2) Member of Audit Committee.
 
     All executive officers of the Company are elected annually by the Board of
Directors and serve until their successors are duly elected and qualified. All
directors hold office until the next annual meeting of stockholders and until
their successors shall have been duly elected and qualified. There are no family
relationships among any of the executive officers and directors of the Company.
 
     Dr. Agersborg has been Chairman of the Company's Board of Directors since
March 1992 and served as its Chief Executive Officer and President until April
1994. Dr. Agersborg also serves as President and Chief Executive Officer of
Afferon Corporation, Fieldcastle, Inc. and Maret Corporation, having joined such
companies in September 1992, January 1992 and September 1994, respectively. Each
of such companies engages in pharmaceutical development. From May 1988 until his
retirement in June 1990, Dr. Agersborg was the President of Wyeth-Ayerst
Laboratories Division of American Home Products Corporation ("AHP"). Prior to
that, his responsibilities with AHP included the development of NDA submissions
with the FDA.
 
     Dr. Gallagher joined the Company in April 1994 as President and Chief
Executive Officer and was elected to the Board of Directors in November 1994.
From 1988 until joining the Company, Dr. Gallagher was employed by Bristol-Myers
Squibb Company ("BMS") and its predecessor, Squibb Corporation, in various
executive positions including strategic planning, worldwide product and business
development and marketing. Since 1991, Dr. Gallagher was Vice President and
General Manager of Squibb Diagnostics, the in vivo imaging pharmaceutical
division where he was responsible for drug development, including filing NDAs
with the FDA and other regulatory authorities worldwide. Prior to that, Dr.
Gallagher served for ten years with E.I. DuPont de Nemours & Co. in a variety of
pharmaceutical research, development, marketing and business management
positions.
 
     Mr. Ashley joined the Company in September 1994 as Vice President,
Commercial Development. From 1989 until joining the Company, he was employed by
BMS and its predecessor, Squibb Corporation, in various positions including
product development, commercial and business development and, most recently, as
Director, Business Development where he was responsible for the worldwide
product and market development of several new drugs. From 1979 to 1989, Mr.
Ashley held various positions at Amersham International (UK) Ltd., including
research, development, manufacturing, sales and marketing positions, as well as
worldwide product development and product launch positions.
 
                                       34
<PAGE>   37
 
     Ms. Broadbent joined the Company in March 1996 as Chief Financial Officer,
Treasurer and Secretary. From October 1994 until joining the Company, Ms.
Broadbent served as Senior Vice President, Chief Financial Officer and director
of Human Genome Sciences, Inc., a biotechnology company. From January 1993 to
October 1994, she served as Vice President and Chief Financial Officer of
Cangene Corporation, a biopharmaceutical company. From January 1992 through
December 1992, Ms. Broadbent served as an independent financial consultant. From
March 1990 to December 1991, she was employed by Baring Brothers & Co., Inc.,
initially as Senior Vice President and then as Executive Director, Corporate
Finance. Prior to that, Ms. Broadbent served for nine years in corporate finance
positions with Salomon Brothers, Inc and PaineWebber Incorporated.
 
     Mr. Easton has been a director of the Company since November 1993. He is
Managing Director of The Wilkerson Group, Inc., a major health care consulting
firm, where he has served in such capacity since 1986. Mr. Easton is a former
President of the Biomedical Marketing Association.
 
     Mr. Daverman has been a director of the Company since November 1995. He is
a managing general partner of Marquette Venture Partners ("MVP"), a venture
capital investment company, and has been with MVP since January 1987. Mr.
Daverman is a general partner of Marquette Management Partners, 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. and MVP II
Affiliates Fund, L.P. He is a member of the Board of Directors of the Technology
Advisory Group of the Technology Management Office of the University of
Michigan. Mr. Daverman is a member of the Board of Directors of PCS Development
Corporation.
 
     Dr. Ritterbush has been a director of the Company since its founding in
January 1992. He is managing general partner of Fairfax Partners/The Venture
Fund of Washington, L.P., a venture capital fund, which he co-founded in 1989.
 
     Mr. Schiller has been a director of the Company since September 1995. He
joined Advanced Technology Ventures ("ATV"), a venture capital fund, in
September 1986 and is currently a general partner of various ATV funds. He is a
director of Anthra Pharmaceuticals, Afferon Corporation, Avicenna Systems
Corporation, HealthShare Technology, Inc. and Novoste Corporation.
 
     Dr. Winters has been a director of the Company since its founding in
January 1992. He is a general partner of Columbine Venture Funds, a venture
capital fund, of which he was a founder in 1983. He also serves as a director of
Afferon Corporation, Maret Corporation and Melanotan Corporation.
 
     The Board of Directors has a Compensation Committee, which approves
salaries and incentive compensation for executive officers of the Company and
which administers the Company's stock option plans, and an Audit Committee,
which reviews the results and scope of the audit and other services provided by
the Company's independent accountants.
 
CLINICAL ADVISORY BOARD
 
     The Company's Clinical Advisory Board (the "CAB") consists of individuals
with recognized expertise in the fields of periodontal disease, general dental
science, biochemistry and related fields who advise the Company principally
about clinical affairs. Members of the CAB consult and meet with Company
management informally and at periodic meetings. All members of the CAB are
employed by employers other than the Company and have commitments to or
consulting or advisory agreements with other entities that limit their
availability to the Company. These companies also may be competitors of the
Company. Although members of the CAB may devote significant time and energy to
the affairs of the Company, no member of the CAB is expected to devote more than
a small portion of his time to the Company. The following persons are members of
the Company's CAB:
 
     Timothy Blieden, D.D.S., M.S., Ph.D.  Dr. Blieden is an Assistant Professor
in the Department of Periodontology at the Eastman Dental Center, University of
Rochester where he is a Clinical Instructor of Graduate Periodontics. Dr.
Blieden has conducted numerous research studies for
 
                                       35
<PAGE>   38
 
pharmaceutical companies evaluating anti-plaque and anti-microbial oral rinse
products and host modulating agents for the treatment of periodontitis. Dr.
Blieden received his D.D.S. from Loyola University, Chicago and his M.S. and
Ph.D. in Immunology from the University of Rochester. Dr. Blieden also maintains
a private periodontal practice in Rochester.
 
     Jack Caton, D.D.S., M.S.  Dr. Caton is the Chair and Professor in the
Department of Periodontology at the Eastman Dental Center, University of
Rochester. Dr. Caton has served on the Executive Council of the American Academy
of Periodontology and recently was elected Secretary of such academy. Dr. Caton
has conducted many studies evaluating various treatment modalities for
periodontitis and other diseases involving the periodontium. Dr. Caton received
his D.D.S. from the University of California at San Francisco and his M.S. in
Periodontology from the University of Rochester. He is a Diplomate and former
Chairman of the American Board of Periodontology. Dr. Caton also maintains a
private periodontal practice in Rochester.
 
     Sebastian Ciancio, D.D.S.  Dr. Ciancio is the Chairman of the Department of
Periodontics and Clinical Professor of Pharmacology in the Schools of Medicine
and Dental Medicine at the State University of New York at Buffalo. Dr. Ciancio
has served as President, American Academy of Periodontology and Chairman,
Council on Dental Therapeutics, American Dental Association. Dr. Ciancio has
conducted many studies evaluating a variety of treatment modalities for diseases
of the periodontium. He is also a Diplomate of the American Board of
Periodontology and has authored and contributed to many dental textbooks. Dr.
Ciancio also held the rank of Captain in the U.S. Army Dental Corps. Dr. Ciancio
received his D.D.S. and Certificate in Periodontology from the State University
of New York at Buffalo.
 
     Chester W. Douglas, D.M.D., Ph.D., M.P.H.  Dr. Douglas is the Chairman of
the Department of Oral Health Policy in the School of Dental Medicine and
Professor in the Department of Epidemiology in the School of Public Health at
Harvard University. Dr. Douglas has served as President, Vice President and
Treasurer of the American Board of Public Health Association. Dr. Douglas has
over 60 publications in the areas of dental and periodontal policy and
pharmacoeconomics. Dr. Douglas received his D.M.D. from Temple University and
his Ph.D. and M.P.H. from the University of Michigan.
 
     Lorne M. Golub, D.M.D., M.S.  Dr. Golub is a Professor in the Department of
Oral Biology and Pathology and Associate Dean for Research in the School of
Dental Medicine at the State University of New York at Stony Brook. Dr. Golub is
known for his research on gingival crevicular fluid analytes and tissue
destructive proteinases in gingival collagen metabolism and the discovery of the
anti-collagenolytic activity of tetracycline analogs. Dr. Golub has won several
awards for his research including the MERIT award from the National Institute of
Dental Research, an Academic Excellence award from New York State and the
Birnberg Dental Research Award from Columbia University. He has authored over
180 publications in various dental, medical and biologic journals and most
recently, he was the co-editor of a text on collagenase inhibitors published by
the New York Academy of Sciences. Dr. Golub received his D.M.D. and M.S. from
the University of Manitoba and his Certificate in Periodontology from Harvard
University.
 
     M. John Novak, B.D.S., L.D.S., M.S., Ph.D.  Dr. Novak is Chairman and
Associate Professor of the Department of Periodontics at the University of
Pittsburgh. Dr. Novak has conducted numerous studies of treatments for diseases
of the periodontium and basic immunology and microbiology research relating to
periodontal disease. He is a Diplomate of the American Board of Periodontology.
Dr. Novak received his B.D.S. from the University of London, his L.D.S. from the
Royal College of Surgeons and his M.S. and Ph.D. in Microbiology from the
University of Rochester.
 
     Alan M. Polson, D.D.S., D.M.D., L.D.S., M.S., M.A.  Dr. Polson is currently
the Chairman of the Department of Periodontology and the D. Walter Cohen
Professor of Periodontics in the School of Dental Medicine at the University of
Pennsylvania. Dr. Polson has served as President, Periodontal Research Group,
American Association of Dental Research, and Vice President and Director of
Clinical Research, Atrix Laboratories. Dr. Polson has conducted many periodontal
research studies
 
                                       36
<PAGE>   39
 
and is the author of over 200 publications. He also is a Diplomate of the
American Board of Periodontology. Dr. Polson received his D.D.S. from the
University of London, his D.M.D. from the University of Pennsylvania, his L.D.S.
from the Royal College of Surgeons, his M.S. in Periodontology from the
University of Rochester and his M.A. from the University of Pennsylvania.
 
DIRECTORS' COMPENSATION
 
     Helmer P.K. Agersborg is paid $36,000 per year for his services as Chairman
of the Board. The Wilkerson Group, Inc. receives $1,500 per meeting for each
meeting of the Board of Directors attended by Mr. Easton. No other directors
receive cash compensation for services on the Board of Directors. The Company
provides reimbursement to directors for reasonable and necessary expenses
incurred in connection with attendance at meetings of the Board of Directors and
other Company business.
 
     In addition, the Company granted to Dr. Agersborg options to purchase
60,625, 28,084 and 22,500 shares of Common Stock on March 1, 1992, September 1,
1993 and March 1, 1995, respectively, at exercise prices of $0.20, $0.20 and
$0.335, respectively. Of such options, an aggregate of 88,709 have been
exercised. The remaining options vested to the extent of 7,500 shares on March
1, 1996 and will vest to the extent of 7,500 shares on each of March 1, 1997 and
1998. The Company granted to Mr. Easton options to purchase 7,500 shares of
Common Stock on each of January 1, 1994 and October 1, 1995 at exercise prices
of $0.20 and $1.20, respectively. Of such options, 7,500 have been exercised and
the remaining 7,500 vest to the extent of 2,500 shares per year commencing
October 1, 1996.
 
1996 NON-EMPLOYEE DIRECTOR STOCK OPTION PLAN
 
     On March 22, 1996, the Board of Directors approved and, on March 29, 1996,
the stockholders adopted, the Company's Non-Employee Director Plan. The
Non-Employee Director Plan currently provides for the grant of options to
purchase a maximum of 109,000 shares of Common Stock of the Company to
non-employee directors of the Company.
 
     Each person who is a director of the Company on the effective date of the
Company's initial public offering or who becomes a director of the Company
thereafter, and who is not also an employee or officer of the Company, shall be
granted, on the effective date or the date on which he or she becomes a
director, whichever is later, an option to purchase 10,000 shares of Common
Stock, at an exercise price per share equal to the then fair market value of the
shares. No subsequent grants are permitted to such individuals under the
Non-Employee Director Plan. All options become exercisable in five equal annual
installments commencing one year after the date of grant provided that the
optionee then remains a director at the time of vesting of the installments. The
right to exercise annual installments of options will be reduced proportionately
based on the optionee's actual attendance at directors' meetings if the optionee
fails to attend at least 80% of the directors' meetings held in any calendar
year. The term of each option will be for a period of ten years from the date of
grant, unless sooner terminated in accordance with the Non-Employee Director
Plan. Options may not be transferred except by will or by the laws of descent
and distribution or pursuant to a domestic relations order and are exercisable
to the extent vested at any time prior to the scheduled expiration date of the
option. The Non-Employee Director Plan terminates on the earlier of March 28,
2006 or at such time as all shares of Common Stock currently or hereafter
reserved for issuance shall have been issued.
 
EXECUTIVE COMPENSATION
 
     The following table sets forth information concerning compensation for
services in all capacities awarded to, earned by or paid to the Company's Chief
Executive Officer and the only other executive officer of the Company whose
aggregate cash compensation exceeded $100,000 (collectively, the "Named
Executives") during the year ended December 31, 1995.
 
                                       37
<PAGE>   40
 
                         SUMMARY COMPENSATION TABLE(1)
 
<TABLE>
<CAPTION>
                                                                                 LONG-TERM
                                                                               COMPENSATION
                                                                                  AWARDS
                                                                              ---------------
                                                     ANNUAL COMPENSATION        SECURITIES
                                                     --------------------       UNDERLYING
       NAME AND PRINCIPAL POSITION          YEAR     SALARY ($)   BONUS ($)     OPTIONS (#)
       ---------------------------          ----     --------     -------     ---------------
<S>                                         <C>      <C>          <C>             <C>
Brian M. Gallagher, Ph.D., President and
  Chief Executive Officer(2)..............  1995     $225,000     $50,000         100,000
Robert A. Ashley, Vice President,
  Commercial Development..................  1995      120,000      10,000          37,500
</TABLE>
 
- ---------------
(1) The costs of certain benefits are not included because they did not exceed,
    in the case of each Named Executive, the lesser of $50,000 or 10% of the
    total annual salary and bonus reported in the above table.
(2) In November 1994, Dr. Gallagher purchased 125,000 shares of the Company's
    restricted Common Stock at $0.335 per share. Such shares are subject to
    vesting and the Company's repurchase right and right of first refusal. Of
    such shares, 25,000 vested immediately, an aggregate of 64,596 have vested
    to date and the remaining 60,404 will vest in equal monthly portions over
    the next 29 months. Pursuant to the Company's repurchase right, the Company
    may repurchase any of Dr. Gallagher's unvested shares, at a purchase price
    of $0.335 per share, at the time of termination of his service. Pursuant to
    the Company's right of first refusal, the Company may buy back Dr.
    Gallagher's vested shares at $0.335 per share, if Dr. Gallagher is
    terminated for cause, and at the current market value per share, if he is
    terminated for any other reason. At December 31, 1995, Dr. Gallagher held
    52,092 shares of restricted Common Stock with a year-end value of $190,197
    based on the value of the Common Stock as of such date ($4.00 per share),
    less the purchase price per share paid for such shares ($0.335 per share).
 
OPTION GRANTS IN 1995
 
     The following table sets forth information concerning individual grants of
stock options made pursuant to the Company's 1992 Plan during 1995 to each of
the Named Executives. The Company has never granted any stock appreciation
rights.
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                  INDIVIDUAL GRANTS
                              ---------------------------------------------------------
                                           PERCENT OF
                              NUMBER OF      TOTAL                                       POTENTIAL REALIZABLE VALUE
                              SECURITIES    OPTIONS                MARKET                AT ASSUMED ANNUAL RATES OF
                              UNDERLYING    GRANTED     EXERCISE  PRICE ON                STOCK PRICE APPRECIATION
                               OPTIONS    TO EMPLOYEES  OR BASE   THE DATE                   FOR OPTION TERM(3)
                               GRANTED     IN FISCAL     PRICE    OF GRANT   EXPIRATION  --------------------------
            NAME                (#)(1)     YEAR(%)(2)    ($/SH)    ($/SH)       DATE     0% ($)   5% ($)   10% ($)
            ----              ----------  ------------  --------  ---------  ----------  -------  -------  --------
<S>                           <C>         <C>           <C>       <C>        <C>         <C>      <C>      <C>
Brian M. Gallagher, Ph.D. ...   50,000          34%      $ 1.20       N/A     10/01/05   $    --  $37,734  $ 95,625
                                50,000          34        0.335     $1.20     10/15/05    43,250   80,984   138,875
Robert A. Ashley.............   37,500          25         1.20       N/A     10/01/05        --   28,300    71,718
</TABLE>
 
- ---------------
(1) Such options were granted pursuant to and in accordance with the Company's
    1992 Plan. See "-- Stock Option Plans."
(2) Based on an aggregate of 148,000 options granted to employees in 1995,
    including options granted to Named Executives.
(3) Based on a grant date fair market value of $1.20 per share. Potential
    realizable value is based on the assumption that the price per share of
    Common Stock appreciates at the assumed annual rate of stock appreciation
    for the option term. The assumed 0%, 5% and 10% annual rates of appreciation
    (compounded annually) over the term of the option are set forth in
    accordance with the rules and regulations adopted by the Securities and
    Exchange Commission and do not represent the Company's estimate of stock
    price appreciation.
 
                                       38
<PAGE>   41
 
     The following table sets forth information concerning each exercise of
options during 1995 by each of the Named Executives and the fiscal year-end
value of unexercised in-the-money options.
 
                AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                       AND FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                     NUMBER OF SECURITIES UNDERLYING    VALUE OF UNEXERCISED IN-THE-
                                         UNEXERCISED OPTIONS AT            MONEY OPTIONS AT FISCAL
                                           FISCAL YEAR-END(#)                  YEAR-END ($)(1)
                                    ---------------------------------   -----------------------------
               NAME                 EXERCISABLE         UNEXERCISABLE   EXERCISABLE     UNEXERCISABLE
- ----------------------------------  -----------         -------------   -----------     -------------
<S>                                 <C>                 <C>             <C>             <C>
Brian M. Gallagher, Ph.D. ........     26,667               73,333        $97,735         $ 225,515
Robert A. Ashley..................      9,375               65,625         34,360           208,078
</TABLE>
 
- ---------------
(1) Based on the fair market value of the Common Stock at December 31, 1995 of
    $4.00 per share, less the exercise price payable for such shares.
 
STOCK OPTION PLANS
 
     The Company's 1992 Plan was adopted by the Board of Directors and approved
by the stockholders of the Company on February 20, 1992 and March 1, 1992,
respectively. A total of 288,500 shares of Common Stock currently are reserved
for issuance upon exercise of options granted under the 1992 Plan.
 
     Pursuant to the 1992 Plan, on March 1, 1996, the Company granted to Nancy
C. Broadbent, the Company's Chief Financial Officer, an option to purchase
60,000 shares of Common Stock of the Company at an exercise price of $2.00 per
share. Upon the grant date, 20% of such shares vested and an additional 20% will
vest in each year commencing on the first anniversary of the date of grant.
 
     The 1996 Stock Plan was adopted by the Board of Directors and approved by
the stockholders of the Company on March 22, 1996 and March 29, 1996,
respectively. A total of 750,000 shares are reserved for issuance upon the
exercise of options and/or stock purchase rights granted under the 1996 Stock
Plan, none of which have been granted. Those eligible to receive stock option
grants or stock purchase rights under the 1996 Stock Plan include employees,
non-employee directors and consultants. The 1996 Stock Plan is administered by
the Compensation Committee of the Board of Directors of the Company, which is
comprised solely of outside directors.
 
     Subject to the provisions of the 1996 Stock Plan, the administrator of the
1996 Stock Plan has the discretion to determine the optionees and/or grantees,
the type of options to be granted (incentive stock options ("ISOs") or
non-qualified stock options ("NQSOs")), the vesting provisions, the terms of the
grants and such other related provisions as are consistent with the 1996 Stock
Plan. The exercise price of an ISO may not be less than the fair market value
per share of the Common Stock on the date of grant or, in the case of an
optionee who beneficially owns 10% or more of the outstanding capital stock of
the Company, not less than 110% of the fair market value per share on the date
of grant. The exercise price of a NQSO may not be less than 85% of the fair
market value per share of the Common Stock on the date of grant or, in the case
of an optionee who beneficially owns 10% or more of the outstanding capital
stock of the Company, not less than 110% of the fair market value per share on
the date of grant. The purchase price of shares issued pursuant to stock
purchase rights may not be less than 50% of the fair market value of such shares
as of the offer date of such rights.
 
     The options terminate not more than ten years from the date of grant,
subject to earlier termination on the optionee's death, disability or
termination of employment with the Company, but provide that the term of any
options granted to a holder of more than 10% of the outstanding shares of
capital stock may be no longer than five years. Options are not assignable or
otherwise transferable except by will or the laws of descent and distribution.
In the event of a merger or consolidation of the Company with or into another
corporation or the sale of all or substantially all of the Company's assets in
which the successor corporation does not assume outstanding options or issue
equivalent options, the Board of Directors of the Company is required to provide
accelerated vesting of outstanding options. The 1996 Stock Plan terminates on
March 21, 2006.
 
                                       39
<PAGE>   42
 
INDEMNIFICATION AGREEMENTS AND NON-COMPETITION, NON-DISCLOSURE AND INVENTION
ASSIGNMENT AGREEMENTS
 
     The Company has executed indemnification agreements with each of its
executive officers and directors pursuant to which the Company 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 the Company.
 
     Each of the Company's employees has agreed to maintain the confidentiality
of Company information, to assign inventions to the Company and, for a period of
two years after termination of employment, not to solicit any person who is
employed by the Company or was employed by the Company at any time during the
year prior to the termination of such employee.
 
     In addition, each of Dr. Gallagher, Ms. Broadbent and Mr. Ashley have
agreed that during the term of his or her employment and for a period of two
years thereafter, such person will not directly or indirectly provide services
to or for any business engaged in research regarding the development,
manufacture, testing, marketing or sale of collagenase inhibiting drugs for
application in periodontal disease or any other application which, during the
period of such person's employment with the Company, is either marketed or in
advanced clinical development by the Company.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     The Compensation Committee consists of Robert J. Easton, Stephen W.
Ritterbush, Ph.D. and Terence E. Winters, Ph.D. There are no Compensation
Committee Interlocks.
 
     In January and November 1992, the Company sold an aggregate of 3,133,000
shares of Series A Redeemable Preferred Stock at a price of $1.00 per share. In
September and November 1993, the Company sold an aggregate of 1,946,268 shares
of Series B Redeemable Preferred Stock at a price of $1.675 per share. In
September and November 1995, the Company sold an aggregate of 5,318,980 shares
of Series C Redeemable Preferred Stock at a price of $2.00 per share. All shares
of Series A, Series B and Series C Redeemable Preferred Stock outstanding as of
the consummation of this offering will be automatically converted into shares of
Common Stock on a one-for-two basis. The purchasers of the Series A, Series B
and Series C Redeemable Preferred Stock included the following members of the
Compensation Committee and entities affiliated with such persons:
 
<TABLE>
<CAPTION>
                                                                    NUMBER OF COMMON STOCK
                                                                        EQUIVALENTS(1)
                                                              ----------------------------------
                                                              SERIES A     SERIES B     SERIES C
                                                              --------     --------     --------
<S>                                                           <C>          <C>          <C>
Columbine Venture Fund, II, L.P. (Dr. Winters)..............   416,667      238,806      313,855
Longbow Partners (Mr. Easton)...............................        --           --       14,366
Fairfax Partners/The Venture Fund of Washington, L.P. (Dr.
  Ritterbush)...............................................   416,667       29,850           --
</TABLE>
 
- ---------------
(1) Relates only to shares attributable to the issuance and sale by the Company
    of shares of Series A, Series B and Series C Redeemable Preferred Stock and
    excludes other issuances and sales to such stockholders, if any, since the
    Company's inception. See "Principal Stockholders."
 
   
     The shares of Common Stock issuable upon conversion of the Series A, Series
B and Series C Redeemable Preferred Stock are entitled to certain registration
rights and certain rights to participate in certain future offerings undertaken
by the Company. See "Description of Capital Stock -- Registration Rights of
Certain Holders and Rights of Participation in Future Offerings."
    
 
     Dr. Ritterbush formerly served, without compensation, as Treasurer of the
Company.
 
     Mr. Easton received an option to purchase 7,500 shares of Common Stock on
each of January 1, 1994 and October 1, 1995 at exercise prices of $0.20 and
$1.20, respectively. See "--Directors' Compensation."
 
                                       40
<PAGE>   43
 
                              CERTAIN TRANSACTIONS
 
     In January and November 1992, the Company sold an aggregate of 3,133,000
shares of Series A Redeemable Preferred Stock at a price of $1.00 per share. In
September and November 1993, the Company sold an aggregate of 1,946,268 shares
of Series B Redeemable Preferred Stock at a price of $1.675 per share. In
September and November 1995, the Company sold an aggregate of 5,318,980 shares
of Series C Redeemable Preferred Stock at a price of $2.00 per share. All shares
of Series A, Series B and Series C Redeemable Preferred Stock outstanding as of
the consummation of this offering will be automatically converted shares of
Common Stock on a one-for-two basis. The purchasers of the Series A, Series B
and Series C Redeemable Preferred Stock included the following 5% stockholders,
directors and entities affiliated with directors:
 
<TABLE>
<CAPTION>
                                                                    NUMBER OF COMMON STOCK
                                                                        EQUIVALENTS(1)
                                                              ----------------------------------
                                                              SERIES A     SERIES B     SERIES C
                                                              --------     --------     --------
<S>                                                           <C>          <C>          <C>
DIRECTORS AND ENTITIES AFFILIATED WITH DIRECTORS
Advanced Technology Ventures III, L.P. (Mr. Schiller).......        --      223,880      166,419
Marquette Venture Partners II, L.P. and MVP II Affiliates
  Fund, L.P. (Mr. Daverman).................................   166,667      447,760      301,886
OTHER 5% STOCKHOLDERS
Johnson & Johnson Development Corporation...................   486,500           --      317,829
Innocal, L.P................................................        --           --      375,000
Delphi Ventures III, L.P. and Delphi Investments III,
  L.P. .....................................................        --           --      625,000
</TABLE>
 
- ---------------
(1) Relates only to shares attributable to the issuance and sale by the Company
    of shares of Series A, Series B and Series C Redeemable Preferred Stock and
    excludes other issuances and sales to such stockholders, if any, since the
    Company's inception. See "Principal Stockholders."
 
     For information with respect to Mr. Easton and Drs. Ritterbush and Winters,
each a member of the Compensation Committee, see "Management -- Compensation
Committee Interlocks and Insider Participation."
 
   
     The shares of Common Stock issuable upon conversion of the Series A, Series
B and Series C Redeemable Preferred Stock are entitled to certain registration
rights and certain rights to participate in certain future offerings undertaken
by the Company. See "Description of Capital Stock -- Registration Rights of
Certain Holders and Rights of Participation in Future Offerings."
    
 
     The Board of Directors of the Company has adopted a policy requiring that
any future transactions between the Company and its officers, directors,
principal stockholders and their affiliates be on terms no less favorable to the
Company than could be obtained from unrelated third parties and that any such
transactions be approved by a majority of the disinterested members of the
Company's Board of Directors.
 
                                       41
<PAGE>   44
 
                             PRINCIPAL STOCKHOLDERS
 
     The following table sets forth certain information regarding the beneficial
ownership of the Company's Common Stock as of March 31, 1996, and as adjusted to
reflect the sale of the shares of Common Stock offered hereby, by (i) each
person who is known to the Company to own beneficially more than 5% of the
outstanding shares of Common Stock, (ii) each of the Company's directors and
Named Executives, and (iii) all current directors and executive officers of the
Company as a group.
 
   
<TABLE>
<CAPTION>
                                                                        PERCENTAGE OF OUTSTANDING
                                              NUMBER OF SHARES OF               SHARES(2)
                                                 COMMON STOCK        --------------------------------
                                             BENEFICIALLY OWNED(1)   BEFORE OFFERING   AFTER OFFERING
                                             ---------------------   ---------------   --------------
<S>                                          <C>                     <C>               <C>
Columbine Venture Fund II, L.P.
  6155 N. Scottsdale Road, Suite 100
  Scottsdale, Arizona 85250................          969,328               17.6%            12.9%
Marquette Venture Partners II, L.P. and MVP
  II Affiliates Fund, L.P.
  520 Lake Cook Road, Suite 450
  Deerfield, Illinois 60015................          916,313(3)            16.6             12.2
Johnson & Johnson Development Corporation
  One Johnson & Johnson Plaza
  New Brunswick, New Jersey 08937..........          804,329               14.6             10.7
Delphi Ventures III, L.P. and
  Delphi Investments III, L.P.
  3000 Sand Hill Road
  Building 1, Suite 135
  Menlo Park, California 94025.............          625,000(4)            11.3              8.3
Fairfax Partners/The Venture Fund of
  Washington, L.P.
  1568 Spring Hill Road, Suite 200
  McLean, Virginia 22102...................          446,517                8.1              5.9
Advanced Technology Ventures III, L.P.
  10 Post Office Square
  Boston, Massachusetts 02109..............          390,299                7.1              5.2
Innocal, L.P.
  Park 80 West/Plaza One
  Saddle Brook, New Jersey 07662...........          375,000                6.8              5.0
Brian M. Gallagher, Ph.D...................          155,834(5)             2.8              2.1
Robert A. Ashley...........................            9,375(6)               *                *
Helmer P.K. Agersborg, Ph.D................           96,209(7)             1.7              1.3
James E. Daverman..........................          916,313(8)            16.6             12.2
Robert J. Easton...........................           29,366(9)               *                *
Stephen W. Ritterbush, Ph.D................          446,517(10)            8.1              5.9
Pieter J. Schiller.........................          390,299(11)            7.1              5.2
Terence E. Winters, Ph.D...................          969,328(12)           17.6             12.9
All current directors and executive
  officers as a group (9 persons)..........        3,025,241(13)           54.3             39.9
</TABLE>
    
 
- ---------------
  *  Less than one percent
 (1) Except as set forth in the footnotes to this table and subject to
     applicable community property law, the persons named in the table have sole
     voting and investment power with respect to all shares.
   
 (2) Applicable percentage of ownership is based on 5,514,283 shares of Common
     Stock outstanding on March 31, 1996 and 7,514,283 shares of Common Stock
     outstanding after the completion of this offering.
    
 (3) Includes 890,860 shares and 25,453 shares owned by Marquette Venture
     Partners II, L.P. and MVP II Affiliates Fund, L.P., respectively.
 (4) Includes 613,946 shares and 11,054 shares owned by Delphi Ventures III,
     L.P. and Delphi Investments III, L.P., respectively.
 (5) Of such shares, 125,000 are subject to certain rights of first refusal held
     by the Company, of which 60,404 also are subject to repurchase by the
     Company. See "Management -- Executive Compensation." Includes 30,834 shares
     of Common Stock underlying options which are exercisable as of March 31,
     1996 or 60 days after such date.
 
                                       42
<PAGE>   45
 
 (6) Includes 9,375 shares of Common Stock underlying options which are
     exercisable as of March 31, 1996 or 60 days after such date.
 (7) Includes 7,500 shares of Common Stock underlying options which are
     exercisable as of March 31, 1996 or 60 days after such date.
 (8) James E. Daverman is co-founding general partner of Marquette Venture
     Partners II, L.P. and MVP II Affiliates Fund, L.P. and, as such, has the
     power to vote or direct the vote of and to dispose of or direct the
     disposition of the shares owned by Marquette Venture Partners II, L.P. and
     MVP II Affiliates Fund, L.P. Mr. Daverman expressly disclaims beneficial
     ownership of such shares, except as to his proportionate interest in
     Marquette Venture Partners II, L.P. and MVP II Affiliates Fund, L.P.
 (9) Includes 20,278 shares of Common Stock held by Longbow Partners of which
     Robert J. Easton is a general partner. Mr. Easton expressly disclaims
     beneficial ownership of such shares, except as to his proportionate
     interest in Longbow Partners.
(10) Stephen W. Ritterbush, Ph.D. is a general partner of Fairfax Partners/The
     Venture Fund of Washington, L.P. and, as such, has the power to vote or
     direct the vote of and to dispose of or direct the disposition of the
     shares owned by Fairfax Partners/The Venture Fund of Washington, L.P. Dr.
     Ritterbush expressly disclaims beneficial ownership of such shares, except
     as to his proportionate interest in Fairfax Partners/The Venture Fund of
     Washington, L.P.
(11) Pieter J. Schiller is a general partner of Advanced Technology Ventures
     III, L.P. and, as such, has the power to vote or direct the vote of and to
     dispose of or direct the disposition of the shares owned by Advanced
     Technology Ventures III, L.P. Mr. Schiller expressly disclaims beneficial
     ownership of such shares, except as to his proportionate interest in
     Advanced Technology Ventures III, L.P.
(12) Terence E. Winters, Ph.D. is a general partner of Columbine Venture Fund
     II, L.P. and, as such, has the power to vote or direct the vote of and to
     dispose of or direct the disposition of the shares owned by Columbine
     Venture Fund II, L.P. Dr. Winters expressly disclaims beneficial ownership
     of such shares, except as to his proportionate interest in Columbine
     Venture Fund II, L.P.
(13) See Notes 5 through 12. Also includes 12,000 shares of Common Stock
     underlying options which are exercisable as of March 31, 1996 or 60 days
     after such date, held by an executive officer of the Company not
     individually listed.
 
                                       43
<PAGE>   46
 
                          DESCRIPTION OF CAPITAL STOCK
 
     At the closing of this offering, the Company's authorized capital stock
will consist of 25,000,000 shares of Common Stock, $0.01 par value, and
5,000,000 shares of undesignated Preferred Stock, $0.01 par value (the
"Preferred Stock").
 
COMMON STOCK
 
     Holders of shares of Common Stock are entitled to one vote for each share
held of record on matters to be voted on by the stockholders of the Company.
Holders of shares of Common Stock will be entitled to receive dividends, subject
to the senior rights of preferred stockholders, if any, when, as and if declared
by the Board of Directors (see "Dividend Policy") and to share ratably in the
assets of the Company legally available for distribution to its stockholders in
the event of the liquidation, dissolution or winding-up of the Company. Holders
of Common Stock have no preemptive, subscription, redemption or conversion
rights. All of the issued and outstanding shares of Common Stock are, and all
shares of Common Stock to be sold in this offering will be, duly authorized,
validly issued, fully paid and nonassessable.
 
     At March 31, 1996, there were 5,514,283 shares of Common Stock issued and
outstanding and held of record by 26 stockholders and options to purchase an
aggregate of 288,500 shares of Common Stock were outstanding.
 
PREFERRED STOCK
 
     The Company's Board of Directors may without further action by the
Company's stockholders, from time to time, direct the issuance of shares of
Preferred Stock in series and may, at the time of issuance, determine the
rights, preferences and limitations of each series. The holders of Preferred
Stock would normally be entitled to receive a preference payment in the event of
any liquidation, dissolution or winding-up of the Company before any payment is
made to the holders of the Common Stock. The Company does not presently intend
to issue any series of Preferred Stock.
 
     The overall effect of the ability of the Company's Board of Directors to
issue Preferred Stock may be to render more difficult the accomplishment of
mergers or other takeover or change-in-control attempts. To the extent that this
ability has this effect, removal of the Company's incumbent Board of Directors
and management may be rendered more difficult. Further, this may have an adverse
impact on the ability of stockholders of the Company to participate in a tender
or exchange offer for the Common Stock and in so doing diminish the market value
of such stock. See "Risk Factors--Control by Management and Existing
Stockholders" and "--Anti-takeover Effect of Certain Charter and By-law
Provisions and Delaware Law."
 
   
REGISTRATION RIGHTS OF CERTAIN HOLDERS AND RIGHTS OF PARTICIPATION IN FUTURE
OFFERINGS
    
 
     In September 1995, the Company and the holders of the Company's Series A,
Series B and Series C Redeemable Preferred Stock entered into a Registration
Rights Agreement (the "Rights Agreement") pursuant to which the Company has
granted certain registration rights to such stockholders. Pursuant to the Rights
Agreement, at any time beginning six months after the effective date of this
offering, the holders of at least a majority of the Common Stock issued upon the
conversion of the Series A, Series B and Series C Redeemable Preferred Stock
(the "Registrable Securities") have the right, subject to certain restrictions
set forth in the Rights Agreement, to require that the Company register the
Registrable Securities requested by such holders at the Company's expense (on no
more than two occasions) on either a Form S-1, Form S-2 or Form S-3 Registration
Statement under the Securities Act. The Company is not, however, required to
register any Registrable Securities unless such shares represent at least 10% of
the Company's outstanding shares of Common Stock, or, if less than 10%, if the
anticipated aggregate offering price exceeds $1,000,000.
 
     After the Company has qualified for the use of Form S-3 under the
Securities Act, the holders of Registrable Securities have the right to an
unlimited number of registrations on such form. The Company is not, however,
required to effect such a registration unless the requesting holders reasonably
anticipate having an aggregate disposition price of at least $500,000.
 
                                       44
<PAGE>   47
 
     Also pursuant to the Rights Agreement, if, at any time during the
seven-year period commencing on the effective date of this offering, the Company
proposes to register any of its Common Stock under the Securities Act for sale
to the public, the holders of the Registrable Securities have unlimited
piggyback registration rights at the Company's expense, subject to certain
restrictions set forth in the Rights Agreement.
 
   
     Also in September 1995, the Company granted to the holders of Redeemable
Preferred Stock certain rights to participate in certain future offerings
undertaken by the Company. Such rights to participate require that, with certain
exceptions including but not limited to an underwritten public offering, any
time the Company proposes to issue, sell or exchange, or reserve therefor, any
securities, the Company must first offer to sell to each of the holders of
Redeemable Preferred Stock their respective pro rata share of such securities at
a price and on terms identical to the price and terms of the securities proposed
to be issued, sold or exchanged in the applicable offering.
    
 
LIMITATION OF DIRECTOR LIABILITY
 
     The Certificate of Incorporation of the Company limits the liability of
directors of the Company to the Company or its stockholders to the fullest
extent permitted by Delaware law. Specifically, directors of the Company will
not be personally liable for money damages for breach of a duty as a director,
except for liability: (i) for any breach of the director's duty of loyalty to
the Company or its stockholders; (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law; (iii) under
Section 174 of the Delaware General Corporation Law, which relates to unlawful
declarations of dividends or other distributions of assets to stockholders or
the unlawful purchase of shares of the corporation; or (iv) for any transaction
from which the director derived an improper personal benefit. See
"Management -- Indemnification Agreements and Non-Competition, Non-Disclosure
and Invention Assignment Agreements."
 
ANTI-TAKEOVER PROVISIONS
 
     The Company is governed by the provisions of Section 203 of the Delaware
General Corporation Law, an anti-takeover law. In general, the statute prohibits
a publicly-held Delaware corporation from engaging in a "business combination"
with an "interested stockholder" for a period of three years after the date of
the transaction in which the person became an interested stockholder, period of
three years after the date of the transaction in which the person became an
interested stockholder, unless the business combination is approved in a
prescribed manner. A "business combination" includes mergers, asset sales and
other transactions resulting in a financial benefit to the interested
stockholder. An "interested stockholder" is a person who, together with
affiliates and associates, owns (or within three years, did own) 15% or more of
the corporation's voting stock. In addition, the Company is authorized to issue
up to 5,000,000 shares of Preferred Stock, with rights, preferences and other
designations, including voting rights, to be determined by the Board of
Directors. Furthermore, the Certificate of Incorporation also provides that: (i)
the affirmative vote of the holders of at least 80% of the voting power of all
outstanding shares of the capital stock of the Company shall be required to
adopt, amend or repeal any provision of the bylaws of the Company; (ii)
stockholders of the Company may not take any action by written consent; (iii)
special meetings of stockholders may be called only by the President, the
Chairman of the Board or a majority of the Board of Directors and business
transacted at any such special meeting shall be limited to matters relating to
the purposes set forth in the notice of such special meeting; (iv) the Board of
Directors, when evaluating an offer related to a tender or exchange offer or
other business combination, is authorized to give due consideration to any
relevant factors, including the social, legal and economic effects upon
employees, suppliers, customers, creditors, the community in which the Company
conducts its business, and the economy of the state, region and nation; and (v)
the affirmative vote of the holders of at least 75% of the voting power of all
outstanding shares of the capital stock of the Company shall be required to
amend the above provisions or the limitation on director liability. The Delaware
statute, the undesignated authorized Preferred Stock and the foregoing
provisions of the Certificate of Incorporation may discourage certain types of
transactions involving an actual or potential change in control of the Company
and could have the effect of delaying, deterring or preventing a change in
control of the Company. In addition, in the
 
                                       45
<PAGE>   48
 
event of a merger or consolidation of the Company with or into another
corporation or the sale of all or substantially all of the Company's assets in
which the successor corporation does not assume outstanding options or issue
equivalent options, the Board of Directors of the Company is required to provide
accelerated vesting of outstanding options.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for the Common Stock is American Stock
Transfer & Trust Company.
 
                                       46
<PAGE>   49
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
   
     Upon completion of this offering, the Company will have outstanding
7,514,283 shares of Common Stock. Of these shares, the 2,000,000 shares sold in
this offering will be freely transferable by persons other than "affiliates" of
the Company without restriction or further registration under the Securities
Act. The remaining 5,514,283 shares of Common Stock outstanding are "restricted
securities" (the "Restricted Shares") within the meaning of Rule 144 under the
Securities Act and may not be sold in the absence of registration under the
Securities Act unless an exemption from registration is available, including an
exemption afforded by Rule 144.
    
 
     Current stockholders holding in the aggregate 5,514,283 shares of Common
Stock have entered into "lock-up" agreements with a Representative of the
Underwriters, providing that, subject to certain exceptions, they will not
offer, sell or otherwise dispose of any shares of Common Stock for a period of
180 days after the date of this Prospectus without the prior written consent of
Alex. Brown & Sons Incorporated, acting as a Representative of the Underwriters.
Following the expiration of the "lock-up" period, approximately 2,827,051 of the
Restricted Shares will be eligible for resale in the public market pursuant to
Rule 144, subject to certain limitations described below. All remaining shares
of Restricted Shares will become eligible for sale over a period of less than
two years and could be sold earlier if the holders exercise any available
registration rights. The holders of 5,199,124 shares of Common Stock have the
right in certain circumstances to require the Company to register their shares
under the Securities Act for resale to the public.
 
   
     Rule 144, as currently in effect, provides that an affiliate of the Company
or a person (or persons whose sales are aggregated) who has beneficially owned
Restricted Shares for at least two years but less than three years is entitled
to sell, commencing 90 days after the date of this Prospectus, within any
three-month period, a number of shares that does not exceed the greater of one
percent of the then outstanding shares of Common Stock (75,143 shares
immediately after this offering) or the average weekly trading volume in the
Common Stock during the four calendar weeks preceding such sale. Sales under
Rule 144 also are subject to certain manner-of-sale provisions, notice
requirements and the availability of current public information about the
Company. However, a person who is not an "affiliate" of the Company at any time
during the three months preceding a sale, and who has beneficially owned
Restricted Shares for at least three years, is entitled to sell such shares
under Rule 144 without regard to the limitations described above.
    
 
     The Securities and Exchange Commission has proposed certain amendments to
Rule 144 that would reduce by one year the holding period required for shares
subject to Rule 144 to become eligible for resale in the public market. This
proposal, if adopted, would substantially increase the number of shares of
Common Stock eligible for immediate resale following the expiration of the
lock-up agreements, with a potential adverse effect on the market price. No
assurance can be given concerning whether or when such proposal will be adopted
by the Securities and Exchange Commission.
 
     As of the date of this Prospectus, there were outstanding options to
purchase an aggregate of 288,500 shares of Common Stock. All optionholders have
entered into "lock-up" agreements. Giving effect to vesting provisions limiting
the exercisability of all of the outstanding options and the "lock-up" period,
an additional 140,218 shares of Common Stock will be eligible for immediate
resale or issuable upon exercise of vested options, subject to compliance with
Rules 144 and 701 under the Securities Act (relating to the sale of shares
issuable under certain compensatory stock plans).
 
     Since there has been no public market for shares of the Common Stock prior
to this offering, the Company is unable to predict the effect that sales made
pursuant to Rules 144 or 701, or otherwise, may have on the prevailing market
price at such times for shares of the Common Stock. Nevertheless, sales of a
substantial amount of the Common Stock in the public market, or the perception
that such sales could occur, could adversely affect market prices. See "Risk
Factors--Shares Eligible for Future Sale and Potential Adverse Effect on Market
Price."
 
                                       47
<PAGE>   50
 
                                  UNDERWRITING
 
     Subject to the terms and conditions of the Underwriting Agreement, the
Underwriters named below (the "Underwriters"), through their Representatives,
Alex. Brown & Sons Incorporated and Volpe, Welty & Company, have severally
agreed to purchase from the Company the following respective numbers of shares
of Common Stock at the initial public offering price less the underwriting
discounts and commissions set forth on the cover page of this Prospectus:
 
   
<TABLE>
<CAPTION>
                                                                                   NUMBER OF
                                   UNDERWRITER                                      SHARES
- ---------------------------------------------------------------------------------  ---------
<S>                                                                                <C>
Alex. Brown & Sons Incorporated..................................................
Volpe, Welty & Company...........................................................
 
                                                                                   ---------
Total............................................................................  2,000,000
                                                                                   =========
</TABLE>
    
 
     The Underwriting Agreement provides that the obligations of the
Underwriters are subject to certain conditions precedent and that the
Underwriters will purchase all shares of the Common Stock offered hereby if any
of such shares are purchased.
 
     The Company has been advised by the Representatives of the Underwriters
that the Underwriters propose to offer the shares of Common Stock to the public
at the initial public offering price set forth on the cover page of this
Prospectus and to certain dealers at such price less a concession not in excess
of $          per share. The Underwriters may allow, and such dealers may
reallow, a concession not in excess of $          per share to certain other
dealers. After the initial public offering, the offering price and other selling
terms may be changed by the Representatives of the Underwriters.
 
   
     The Company has granted to the Underwriters an option, exercisable not
later than 30 days after the date of this Prospectus, to purchase up to 300,000
additional shares of Common Stock at the public offering price less the
underwriting discounts and commissions set forth on the cover page of this
Prospectus. To the extent that the Underwriters exercise such option, each of
the Underwriters will have a firm commitment to purchase approximately the same
percentage thereof that the number of shares of Common Stock to be purchased by
it shown in the above table bears to 2,000,000, and the Company will be
obligated, pursuant to the option, to sell such shares to the Underwriters. The
Underwriters may exercise such option only to cover over-allotments made in
connection with the sale of Common Stock offered hereby. If purchased, the
Underwriters will offer such additional shares on the same terms as those on
which the 2,000,000 shares are being offered.
    
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities, including liabilities under the Securities Act.
 
     Stockholders of the Company, holding in the aggregate 5,514,283 shares of
Common Stock and options to purchase 112,476 shares of Common Stock, have agreed
not to offer, sell or otherwise dispose of any of such Common Stock for a period
of 180 days after the date of this Prospectus without the prior consent of Alex.
Brown & Sons Incorporated. See "Shares Eligible for Future Sale."
 
     Certain officers of Volpe, Welty & Company own in the aggregate 8,750
shares of Common Stock of the Company.
 
     The Representatives of the Underwriters have advised the Company that the
Underwriters do not intend to confirm sales to any accounts over which they
exercise discretionary authority.
 
                                       48
<PAGE>   51
 
     Prior to this offering, there has been no public market for the Common
Stock of the Company. Consequently, the initial public offering price for the
Common Stock has been determined by negotiation between the Company and the
Representatives of the Underwriters. Among the factors considered in such
negotiations were prevailing market conditions, the results of operations of the
Company in recent periods, the market capitalizations and stages of development
of other companies which the Company and the Representatives of the Underwriters
believed to be comparable to the Company, estimates of the business potential of
the Company, the present state of the Company's development and other factors
deemed relevant.
 
                                 LEGAL MATTERS
 
     The validity of the issuance of the Common Stock offered hereby will be
passed upon for the Company by Buchanan Ingersoll, Princeton, New Jersey.
Certain legal matters in connection with the offering will be passed upon for
the Underwriters by Brobeck, Phleger & Harrison LLP, New York, New York.
 
                                    EXPERTS
 
     The financial statements of CollaGenex Pharmaceuticals, Inc. (A Development
Stage Enterprise) as of December 31, 1994 and 1995 and for each of the years in
the three-year period ended December 31, 1995 and for the period from January
10, 1992 (inception) to December 31, 1995 have been included herein and in the
Registration Statement in reliance upon the report of KPMG Peat Marwick LLP,
independent certified public accountants, appearing elsewhere herein, and upon
the authority of said firm as experts in accounting and auditing.
 
     The statements in this Prospectus under the captions "Risk
Factors--Dependence on Patents, License and Proprietary Rights; Enforcement of
Rights" and "Business--Patents, Trade Secrets and Licenses" and other references
herein concerning patents and proprietary rights have been examined and passed
upon for the Company by Hoffmann & Baron, Jericho, New York, and are included in
reliance upon such examination and upon the authority of such counsel as experts
on patents and proprietary rights.
 
     On January 19, 1996, the Company selected KPMG Peat Marwick LLP to act as
independent accountants for the Company and informed the prior auditors, the
Company's independent accountants since January 1994, of its decision. The
former auditors' report on the Company's financial statements for the period
from January 10, 1992 (inception) to December 31, 1993 does not cover the
financial statements of the Company included in this Prospectus. In connection
with its audit for the period from January 10, 1992 (inception) to December 31,
1993, there were no disagreements with the prior auditors on any matters of
accounting principles or practices, financial statement disclosure, or auditing
scope or procedures. The prior auditors' report on the Company's financial
statements for the period from January 10, 1992 (inception) to December 31, 1993
contained no adverse opinion or disclaimer of opinion and was not modified or
qualified as to uncertainty, audit scope, or accounting principles. The decision
to change accountants was approved by the Board of the Directors of the Company.
The prior auditors have furnished the Company with a letter addressed to the
Securities and Exchange Commission (the "Commission") stating their agreement
with the above statements.
 
                             ADDITIONAL INFORMATION
 
     The Company has filed with the Commission a Registration Statement on Form
S-1 (the "Registration Statement") under the Securities Act, with respect to the
shares of Common Stock offered hereby. This Prospectus, which forms a part of
the Registration Statement, does not contain
 
                                       49
<PAGE>   52
 
all the information set forth in the Registration Statement and the exhibits and
schedules filed therewith. For further information with respect to the Company
and the shares of Common Stock offered hereby, reference is made to the
Registration Statement and to such exhibits and schedules filed therewith.
Statements contained herein as to the content of any contract or other document
are not necessarily complete and, in each instance, reference is made to the
copy of such contract or other document filed as an exhibit to the Registration
Statement, and each such statement shall be deemed qualified in its entirety by
such reference.
 
     The Registration Statement and the exhibits and schedules thereto may be
inspected without charge at the principal office of the Commission at the Public
Reference Section of the Commission at Room 1024, Judiciary Plaza, 450 Fifth
Street, N.W., Washington D.C. 20549, and at the regional offices of the
Commission located at Seven World Trade Center, 13th Floor, New York, New York
10048 and Citicorp Center, 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661. Copies of such documents may be obtained from the Public
Reference Section of the Commission, at prescribed rates.
 
                                       50
<PAGE>   53
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                       PAGE
                                                                                       ----
<S>                                                                                    <C>
Independent Auditors' Report.........................................................  F-2
Financial Statements:
  Balance Sheets as of December 31, 1994 and 1995....................................  F-3
  Statements of Operations for the years ended December 31, 1993, 1994 and 1995 and
     for the period from January 10, 1992 (inception) to December 31, 1995...........  F-4
  Statements of Stockholders' Equity (Deficit) for the period from January 10, 1992
     (inception) to December 31, 1992 and for the years ended December 31, 1993, 1994
     and 1995........................................................................  F-5
  Statements of Cash Flows for the years ended December 31, 1993, 1994 and 1995 and
     for the period from January 10, 1992 (inception) to December 31, 1995...........  F-6
  Notes to Financial Statements......................................................  F-7
Condensed Financial Statements (unaudited):
  Condensed Balance Sheets as of March 31, 1996 (unaudited)..........................  F-17
  Condensed Statements of Operations for the three months ended March 31, 1995 and
     1996 and for the period from January 10, 1992 (inception) to March 31, 1996
     (unaudited).....................................................................  F-18
  Condensed Statements of Stockholders' Equity (Deficit) for the period from January
     10, 1992 (inception) to December 31, 1992, for the years ended December 31,
     1993, 1994 and 1995 and for the three months ended March 31, 1996 (unaudited)...  F-19
  Condensed Statements of Cash Flows for the three months ended March 31, 1995 and
     1996 and for the period from January 10, 1992 (inception) to March 31, 1996
     (unaudited).....................................................................  F-20
  Notes to Condensed Financial Statements (unaudited)................................  F-21
</TABLE>
 
                                       F-1
<PAGE>   54
 
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors and Stockholders
  CollaGenex Pharmaceuticals, Inc.:
 
     We have audited the accompanying balance sheets of CollaGenex
Pharmaceuticals, Inc. (A Development Stage Enterprise) as of December 31, 1994
and 1995, and the related statements of operations, stockholders' equity
(deficit) and cash flows for each of the years in the three-year period ended
December 31, 1995 and for the period from January 10, 1992 (inception) to
December 31, 1995. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of CollaGenex Pharmaceuticals,
Inc. (A Development Stage Enterprise) as of December 31, 1994 and 1995, and the
results of its operations and its cash flows for each of the years in the
three-year period ended December 31, 1995 and for the period from January 10,
1992 (inception) to December 31, 1995, in conformity with generally accepted
accounting principles.
 
                                                KPMG Peat Marwick LLP
 
   
Princeton, New Jersey
March 29, 1996, except as to the first paragraph of Note 14,
  which is as of April 10, 1996, and the third paragraph
  of Note 6, and the fourth and last paragraph of Note 14,
  which are as of June 19, 1996
    
 
                                       F-2
<PAGE>   55
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                                 BALANCE SHEETS
                           DECEMBER 31, 1994 AND 1995
 
<TABLE>
<CAPTION>
                                                       
                                                                                       PRO FORMA
                                                                                          1995
                                                       1994             1995           (NOTE 14)
                                                    -----------     ------------    ---------------
                                                                                      (UNAUDITED)
<S>                                                 <C>             <C>              <C>
                      ASSETS
Current assets:
  Cash and cash equivalents.......................  $   617,384     $  5,806,435       $  5,806,435
  Prepaid expenses................................           --            7,282              7,282
                                                    -----------     ------------       ------------
    Total current assets..........................      617,384        5,813,717          5,813,717
Equipment, net (note 3)...........................        5,611           14,748             14,748
Other assets......................................        5,188           11,520             11,520
                                                    -----------     ------------       ------------
    Total assets..................................  $   628,183     $  5,839,985       $  5,839,985
                                                    ===========     ============       ============
  LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable (note 5).......................  $   532,274     $     17,672       $     17,672
  Accrued expenses (note 4).......................      166,639          494,855            494,855
                                                    -----------     ------------       ------------
    Total current liabilities.....................      698,913          512,527            512,527
                                                    -----------     ------------       ------------
Mandatorily redeemable convertible preferred stock
  (at redemption value which includes accreted
  dividends of $1,117,345 and $1,877,146 in 1994
  and 1995, respectively) (notes 6, 7 and 10);
  (converts into 5,199,124 pro forma common shares
  upon consummation of the offering contemplated
  herein):
  Series A convertible preferred stock, $0.01 par
    value; 3,500,000 shares authorized, 3,133,000
    shares issued and outstanding.................    3,887,843        4,169,813                 --
  Series B convertible preferred stock, $0.01 par
    value; 2,000,000 shares authorized, 1,946,268
    shares issued and outstanding.................    3,622,502        3,915,902                 --
  Series C convertible preferred stock, $0.01 par
    value; 5,350,000 shares authorized, 5,318,980
    shares issued and outstanding in 1995 (none in
    1994).........................................           --       10,822,391                 --
                                                    -----------     ------------       ------------
                                                      7,510,345       18,908,106                 --
                                                    -----------     ------------       ------------
Common stockholders' equity (deficit) (notes 8 and
  10):
  Common stock, $0.01 par value; 6,725,000 shares
    authorized in 1994 and 1995, 287,417 and
    312,659 shares issued and outstanding in 1994
    and 1995, respectively; (5,511,783 pro forma
    shares upon conversion).......................        2,875            3,127             55,118
  Additional paid-in capital (deficit) (note
    10)...........................................   (1,032,025)      (1,743,105)        17,113,010
  Deferred compensation (note 8)..................           --          (20,183)           (20,183)
  Deficit accumulated during the development
    stage.........................................   (6,551,925)     (11,820,487)       (11,820,487)
                                                    -----------     ------------       ------------
    Common stockholders' equity (deficit).........   (7,581,075)     (13,580,648)         5,327,458
                                                    -----------     ------------       ------------
Commitments (notes 10, 11, 13 and 14)
    Total liabilities and stockholders' equity
      (deficit)...................................  $   628,183     $  5,839,985       $  5,839,985
                                                    ===========     ============       ============
</TABLE>
 
                See accompanying notes to financial statements.
 
                                       F-3
<PAGE>   56
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                            STATEMENTS OF OPERATIONS
              FOR THE YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
              AND FOR THE PERIOD FROM JANUARY 10, 1992 (INCEPTION)
                              TO DECEMBER 31, 1995
 
   
<TABLE>
<CAPTION>
                                                                                    FOR THE
                                                                                  PERIOD FROM
                                                                                  JANUARY 10,
                                                                                      1992
                                                                                  (INCEPTION)
                                               YEARS ENDED DECEMBER 31,                TO
                                        ---------------------------------------   DECEMBER 31,
                                           1993          1994          1995           1995
                                        -----------   -----------   -----------   ------------
<S>                                     <C>           <C>           <C>           <C>
Revenues..............................  $        --   $        --   $        --   $         --
                                        -----------   -----------   -----------   ------------
Operating expenses incurred in the
  development stage:
     Research and development (notes
       10 and 13).....................    1,913,526     1,927,991     3,635,374      8,607,695
     General and administrative (note
       5).............................      612,706       792,961     1,547,997      3,286,673
                                        -----------   -----------   -----------   ------------
          Total operating expenses....    2,526,232     2,720,952     5,183,371     11,894,368
Other income (expense):
  Interest income.....................       43,475        67,487        58,917        217,989
  Interest expense (note 7)...........           --            --      (144,108)      (144,108)
                                        -----------   -----------   -----------   ------------
                                             43,475        67,487       (85,191)        73,881
                                        -----------   -----------   -----------   ------------
Net loss..............................  $(2,482,757)  $(2,653,465)  $(5,268,562)  $(11,820,487)
                                        ===========   ===========   ===========   ============
  Accretion of undeclared dividends
     attributable to mandatorily
     redeemable convertible preferred
     stock............................  $   351,072   $   575,370   $   759,801   $  1,877,146
                                        ===========   ===========   ===========   ============
Net loss allocable to common
  stockholders........................  $(2,833,829)  $(3,228,835)  $(6,028,363)  $(13,697,633)
                                        ===========   ===========   ===========   ============
Pro forma net loss per share (note 2)
  (unaudited).........................                              $     (1.10)
                                                                    ===========
Shares used in computing pro forma net
  loss per share (note 2)
  (unaudited).........................                                4,807,876
                                                                    ===========
</TABLE>
    
 
                See accompanying notes to financial statements.
 
                                       F-4
<PAGE>   57
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                  STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
     FOR THE PERIOD FROM JANUARY 10, 1992 (INCEPTION) TO DECEMBER 31, 1992
            AND FOR THE YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
<TABLE>
<CAPTION>
                                          COMMON STOCK                                           DEFICIT
                                     -----------------------   ADDITIONAL                   ACCUMULATED DURING        COMMON
                                     NUMBER OF       PAR         PAID-IN       DEFERRED      THE DEVELOPMENT      STOCKHOLDERS'
                                      SHARES        VALUE        CAPITAL     COMPENSATION         STAGE          EQUITY (DEFICIT)
                                     ---------   -----------   -----------   ------------   ------------------   ----------------
<S>                                  <C>         <C>           <C>           <C>            <C>                  <C>
  Issuance of common stock in
    exchange for technology license
    in January 1992, at inception
    (note 10)......................    54,552            546        10,364     $ --            $  --               $     10,910
  Issuance of common stock in
    exchange for consulting
    services (note 8)..............     7,500             75        14,925       --               --                     15,000
  Issuance of common stock in
    exchange for technology license
    in November 1992 (note 10).....    24,396            244         4,635       --               --                      4,879
  Accretion of undeclared dividends
    on mandatorily redeemable
    convertible preferred stock
    (note 6).......................     --           --           (190,903)      --               --                   (190,903)
  Net loss.........................     --           --            --            --              (1,415,703)         (1,415,703)
                                      -------    -----------   -----------     --------        ------------        ------------
Balance, December 31, 1992.........    86,448            865      (160,979)      --              (1,415,703)         (1,575,817)
  Accretion of undeclared dividends
    on mandatorily redeemable
    convertible preferred stock
    (note 6).......................     --           --           (351,072)      --               --                   (351,072)
  Net loss.........................     --           --            --            --              (2,482,757)         (2,482,757)
                                      -------    -----------   -----------     --------        ------------        ------------
Balance, December 31, 1993.........    86,448            865      (512,051)      --              (3,898,460)         (4,409,646)
  Exercise of common stock options
    in September through November
    1994 ($0.20-$0.335 per share)
    (note 8).......................    75,969            760        14,771       --               --                     15,531
  Issuance of common shares to an
    executive officer at $0.335 per
    share in November 1994
    (note 8).......................   125,000          1,250        40,625       --               --                     41,875
  Accretion of undeclared dividends
    on mandatorily redeemable
    convertible preferred stock
    (note 6).......................     --           --           (575,370)      --               --                   (575,370)
  Net loss.........................     --           --            --            --              (2,653,465)         (2,653,465)
                                      -------    -----------   -----------     --------        ------------        ------------
Balance, December 31, 1994.........   287,417          2,875    (1,032,025)      --              (6,551,925)         (7,581,075)
  Exercise of common stock options
    in February through April 1995
    ($0.20 per share) (note 8).....    20,242            202         3,846       --               --                      4,048
  Deferred compensation resulting
    from:
    Grant of options (note 8)......     --           --             43,250      (43,250)          --                   --
    Amortization of deferred
      compensation (note 8)........     --           --            --            23,067           --                     23,067
  Exercise of common stock options
    in November 1995 ($0.335 per
    share) (note 8)................     5,000             50         1,625       --               --                      1,675
  Accretion of undeclared dividends
    on mandatorily redeemable
    convertible preferred stock
    (note 6).......................     --           --           (759,801)      --               --                   (759,801)
  Net loss.........................     --           --            --            --              (5,268,562)         (5,268,562)
                                      -------    -----------   -----------     --------        ------------        ------------
Balance, December 31, 1995.........   312,659    $     3,127   $(1,743,105)    $(20,183)       $(11,820,487)       $(13,580,648)
                                      =======    ===========   ===========     ========        ============        ============
</TABLE>
 
                See accompanying notes to financial statements.
 
                                       F-5
<PAGE>   58
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                            STATEMENTS OF CASH FLOWS
              FOR THE YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
              AND FOR THE PERIOD FROM JANUARY 10, 1992 (INCEPTION)
                              TO DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                           FOR THE PERIOD
                                                                                                FROM
                                                                                            JANUARY 10,
                                                                                                1992
                                                        YEARS ENDED DECEMBER 31,           (INCEPTION) TO
                                                 ---------------------------------------    DECEMBER 31,
                                                     1993          1994          1995            1995
                                                 ------------   -----------   -----------   --------------
<S>                                              <C>           <C>           <C>           <C>
Cash flows from operating activities:
  Net loss allocable to common stockholders....  $(2,833,829)  $(3,228,835)  $(6,028,363)   $(13,697,633)
  Adjustments to reconcile net loss allocable
    to common stockholders to net cash used in
    operating activities:
    Accretion of undeclared dividends
      attributable to mandatorily redeemable
      convertible preferred stock..............      351,072       575,370       759,801       1,877,146
    Non-cash research and development
      expense..................................           --            --            --         513,789
    Compensation expense.......................           --            --        23,067          23,067
    Non-cash consulting expense................           --            --            --          15,000
    Accrued interest converted to preferred
      stock....................................           --            --       121,187         121,187
    Depreciation and amortization expense......          998         1,225         3,617           6,713
    Change in assets and liabilities:
      (Increase) decrease in prepaid
         expenses..............................        2,040            --        (7,282)         (7,282)
      (Increase) decrease in other assets......        1,019        (2,040)       (7,328)        (10,389)
      Increase (decrease) in accounts
         payable...............................      269,439       (64,396)     (514,602)         17,672
      Increase (decrease) in accrued
         expenses..............................      206,810       (85,171)      328,216         494,855
                                                 -----------   -----------   -----------    ------------
         Net cash used in operating
           activities..........................   (2,002,451)   (2,803,847)   (5,321,687)    (10,645,875)
                                                 -----------   -----------   -----------    ------------
Cash flows from investing activities:
  Organizational costs.........................           --            --            --          (5,000)
  Capital expenditures.........................           --        (5,834)      (11,758)        (17,592)
                                                 -----------   -----------   -----------    ------------
         Net cash used in investing
           activities..........................           --        (5,834)      (11,758)        (22,592)
                                                 -----------   -----------   -----------    ------------
Cash flows from financing activities:
  Proceeds from issuance of preferred stock....    3,260,000            --     7,613,273      13,508,273
  Proceeds from issuance of common stock.......           --        57,406         5,723          63,129
  Proceeds from issuance of promissory notes...           --            --     3,028,500       3,028,500
  Repayment of promissory note.................           --            --      (125,000)       (125,000)
                                                 -----------   -----------   -----------    ------------
         Net cash provided by financing
           activities..........................    3,260,000        57,406    10,522,496      16,474,902
                                                 -----------   -----------   -----------    ------------
Net increase (decrease) in cash and cash
  equivalents..................................    1,257,549    (2,752,275)    5,189,051       5,806,435
Cash and cash equivalents at beginning of
  period.......................................    2,112,110     3,369,659       617,384              --
                                                 -----------   -----------   -----------    ------------
Cash and cash equivalents at end of period.....  $ 3,369,659   $   617,384   $ 5,806,435    $  5,806,435
                                                 ===========   ===========   ===========    ============
Supplemental disclosure of cash flows
  information -- cash paid for interest........  $        --   $        --   $    22,921    $     22,921
                                                 ===========   ===========   ===========    ============
Supplemental schedule of non-cash financing
  activities:
    Conversion of promissory notes to preferred
      stock....................................  $        --   $        --   $ 2,903,500    $  2,903,500
                                                    ========      ========      ========        ========
    Deferred compensation......................  $        --   $        --   $    43,250    $     43,250
                                                    ========      ========      ========        ========
</TABLE>
 
                See accompanying notes to financial statements.
 
                                       F-6
<PAGE>   59
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                         NOTES TO FINANCIAL STATEMENTS
                           DECEMBER 31, 1994 AND 1995
 
(1) ORGANIZATION AND BUSINESS ACTIVITIES
 
     CollaGenex Pharmaceuticals, Inc. ("CollaGenex Pharmaceuticals" or the
"Company") was incorporated in Delaware on January 10, 1992. The Company is a
development stage pharmaceutical company engaged in the development and
commercialization of innovative, proprietary medical therapies for the treatment
of periodontal disease and other dental pathologies.
 
     The accompanying financial statements include the results of operations of
the Company for the period from January 10, 1992 (inception) to December 31,
1995.
 
     The Company licensed its core technology from the Research Foundation of
the State University of New York at Stony Brook ("SUNY"), a minority stockholder
of the Company in exchange for common stock. The cost of obtaining such
technology was charged by the Company to research and development expense in the
accompanying statements of operations (note 10).
 
     The Company is currently in the development stage and is devoting
substantially all of its efforts towards conducting pharmaceutical development,
raising capital, obtaining regulatory approval for products under development
and recruiting personnel. In the course of its activities, the Company has
sustained operating losses and expects such losses to continue over at least the
next several years.
 
     The Company plans to finance its operations with a combination of the
initial public offering contemplated herein ("Offering"), revenues from future
product sales, license payments and payments from strategic research and
development arrangements. The Company has not generated positive cash flows from
operations, and there are no assurances that the Company will be successful in
obtaining an adequate level of financing for the long-term development and
commercialization of its planned products. In the near term, if the Offering is
not consummated, the Company believes that its current financial resources and
anticipated sources of liquidity should fund operations based on a reduced level
of planned research and development and administrative activities necessary to
achieve its short-term objectives.
 
     The Company has not generated any revenues and has not yet achieved
profitable operations. There is no assurance that profitable operations, if
achieved, could be sustained on a continuing basis. In addition, development
activities and the commercialization of proprietary medical therapies for the
diagnosis and treatment of periodontal disease will require significant
additional financing. The Company's deficit accumulated during the development
stage aggregated $11,820,487 through December 31, 1995, and it expects to incur
substantial and increasing losses in future periods. Reference is made to "Risk
Factors" appearing elsewhere in this Prospectus, which contains a detailed
description of the risks associated with the Company's business. Further, the
Company's future operations are dependent on the success of the Company's
research and commercialization efforts and, ultimately, upon regulatory approval
and market acceptance of the Company's products.
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
     Cash and Cash Equivalents
 
     The Company considers all highly liquid investments with an original
maturity of three months or less when purchased to be cash equivalents. All cash
and cash equivalents are held in United States financial institutions and money
market funds. The carrying amount of cash and cash equivalents approximates its
fair value due to its short-term nature.
 
                                       F-7
<PAGE>   60
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

     Equipment
 
     Equipment, consisting of computer and office equipment, is recorded at
cost. Depreciation is provided using the straight-line method over the estimated
useful lives of the assets, generally three to five years. Expenditures for
repairs and maintenance are expensed as incurred.
 
     Patent Costs
 
     Patent application and maintenance costs are expensed as incurred.
 
     Licensed Technology
 
     Costs incurred in obtaining the license rights to technology in the
research and development stage are expensed as incurred.
 
     Research and Development
 
     Research and product development costs are expensed as incurred.
 
     Accounting for Income Taxes
 
     Deferred tax assets and liabilities are determined based on differences
between the financial reporting and tax bases of assets and liabilities and are
measured using the enacted tax rates and laws that will be in effect when such
differences are expected to reverse. The measurement of deferred tax assets is
reduced, if necessary, by a valuation allowance for any tax benefits which are
not expected to be realized. The effect on deferred tax assets and liabilities
of a change in tax rates is recognized in the period that such tax rate changes
are enacted.
 
     Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.
 
     Stock-Based Compensation
 
     In October 1995, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" ("SFAS 123") which presents companies with the alternative of
retaining the current accounting for stock-based compensation or adopting a new
accounting method based on the estimated fair value of equity instruments
granted to employees during the year. Companies that do not adopt the fair value
based method of accounting will be required to adopt the disclosure provisions
of SFAS 123 commencing in 1996. The Company expects to continue applying its
current accounting principles and upon adoption in 1996 will present the
required footnote disclosures.
 
     Equity Security Transactions
 
     Since inception, the Board of Directors has established the fair value of
common shares, Series A, B and C mandatorily redeemable convertible preferred
stock, stock options and warrants based upon facts and circumstances existing at
the dates such equity transactions occurred, including the price at which equity
instruments were sold to independent third parties.
 
                                       F-8
<PAGE>   61
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
     Reverse Stock Split
 
     The Company effected a one-for-two reverse stock split of its common stock
on April 10, 1996 (note 14). All common share, per share and pro forma per share
amounts in the accompanying financial statements have been retroactively
adjusted to reflect this reverse stock split. Preferred stock amounts have not
been retroactively adjusted to reflect the common stock reverse split.
 
     Concentration of Credit Risks
 
     The Company invests its excess cash in deposits with major U.S. financial
institutions and money market funds. The Company has established guidelines
relative to diversification and maturities that maintain safety and liquidity.
To date, the Company has not experienced any losses on its cash equivalents and
money market funds.
 
     Pro Forma Net Loss Per Share (unaudited)
 
     Pro forma net loss per share was calculated by dividing the net loss by the
weighted average number of common shares outstanding for the respective periods
adjusted for the dilutive effect of common stock equivalents which consist of
stock options using the treasury stock method. Pro forma net loss per share
gives effect to certain adjustments described below including the aforementioned
reverse stock split.
 
   
     Pursuant to Securities and Exchange Commission ("SEC") Staff Accounting
Bulletins and SEC Staff policy, common and common equivalent shares issued
during the twelve-month period prior to the proposed initial public offering at
prices below the anticipated initial public offering price are presumed to have
been issued in contemplation of the initial public offering and have been
included in the calculation as if they were outstanding for all periods
presented (using the treasury stock method and an assumed initial public
offering price of $10.00 per share).
    
 
     Pursuant to the policy of the SEC staff, the calculation of shares used in
computing pro forma net loss per share also includes all series of mandatorily
redeemable preferred stock that will convert into shares of common stock upon
completion of the Offering (using the if-converted method) from their respective
original dates of issuance.
 
(3) EQUIPMENT
 
     Equipment is comprised of the following at December 31, 1994 and 1995:
 
<TABLE>
<CAPTION>
                                                                             1994     1995
                                                                            ------   -------
<S>                                                                         <C>      <C>
Computer and office equipment.............................................  $5,834   $17,592
Less accumulated depreciation.............................................     223     2,844
                                                                            ------   -------
                                                                            $5,611   $14,748
                                                                            ======   =======
</TABLE>
 
                                       F-9
<PAGE>   62
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(4) ACCRUED EXPENSES
 
     Accrued expenses consist of the following at December 31, 1994 and 1995:
 
<TABLE>
<CAPTION>
                                                                           1994       1995
                                                                         ---------  ---------
<S>                                                                      <C>        <C>
Contracted clinical research...........................................  $  81,450  $ 222,445
Professional and consulting fees.......................................         --    191,540
Payroll and related costs..............................................     85,189     54,963
Disposal costs for expired research and development supplies...........         --     20,000
Other..................................................................         --      5,907
                                                                          --------   --------
                                                                         $ 166,639  $ 494,855
                                                                          ========   ========
</TABLE>
 
(5) RELATED PARTY TRANSACTIONS
 
     The Company shared office space for the period January 1, 1993 through
November 15, 1994 with another company that is related through common ownership.
Transactions with this company were principally limited to the sharing of
expenses associated with maintaining an office and payroll. Net expenses charged
to the Company amounted to approximately $44,000 for each of the years ended
December 31, 1993 and 1994 (none in 1995) and $88,000 for the period from
January 10, 1992 (inception) to December 31, 1995. At December 31, 1994, $34,000
of this amount was outstanding to the aforementioned company and is included in
accounts payable in the accompanying balance sheet. Such amount was paid during
1995.
 
(6) MANDATORILY REDEEMABLE CONVERTIBLE PREFERRED STOCK
 
     The Company completed the sale of its Series A, Series B and Series C
mandatorily redeemable convertible preferred stock ("Series A, Series B and
Series C," respectively) in 1992, 1993 and 1995 at per share prices of $1.00,
$1.675 and $2.00, respectively (see note 10 regarding certain Series A shares
issued in connection with the acquisition of certain technology). Aggregate net
cash proceeds from such equity transactions totaled $13,508,273 ($16,532,960
after conversion of promissory notes and accrued interest to preferred stock).
 
     The holders of Series A, Series B and Series C are entitled to cumulative
dividends at a rate of 9% of the original purchase price per share on the date
of issuance, if and when declared. Cumulative dividends in arrears at December
31, 1995 were $1,036,813, $655,902 and $184,431 for the Series A, B and C
preferred stock, respectively. Such amounts have been accreted in the
accompanying financial statements for the respective periods in which they
accumulated. Accordingly, such amounts have been included in the redemption
value of Series A, B and C mandatorily redeemable preferred stock in the
accompanying balance sheets in accordance with SEC Topic 3-C. Upon consummation
of the Offering, all undeclared dividends as noted above cease to accrue and all
rights with respect thereto cease. No dividends or other distributions can be
declared or paid on other types of capital stock until all dividends on the
Series A, Series B and Series C have been paid. As of December 31, 1995, no such
dividends have been declared.
 
     The holders of the Series A, Series B and Series C are entitled to
liquidation preferences over all other types of capital stock in accordance with
the following preference amounts: the holders of Series A, B and C are entitled
to receive, for each share, $1.00, $1.675 and $2.00, respectively, plus an
amount equal to the total of all declared, accrued and unpaid dividends thereon.
In addition, each share of Series A, Series B and Series C is convertible into
$0.01 par value common stock at a conversion ratio of one-for-two, subject to
adjustments, as defined. Further, such conversion
 
                                      F-10
<PAGE>   63
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(6) MANDATORILY REDEEMABLE CONVERTIBLE PREFERRED STOCK (CONTINUED)
   
becomes mandatory immediately prior to the closing of an initial public offering
for the sale of the Company's common stock at a price per share of not less than
$12.00 (amended to $8.00 per share on June 19, 1996) (see Note 14) and aggregate
gross sales proceeds of not less than $12,000,000, such as the Offering.
Dividends on Series A, Series B and Series C referred to above do not convert
unless declared in accordance with the terms of such stock. No such dividends
have been declared by the Company through December 31, 1995.
    
 
     Commencing September 1, 2000, the Company is required to redeem 25% of the
then outstanding Series A, Series B and Series C at a redemption price equal to
$1.00, $1.675, and $2.00 per share, respectively, plus an amount equal to the
total of all accumulated and unpaid dividends thereon. Such a redemption may be
waived by affirmative votes of at least 60% of the then outstanding holders of
Series A, Series B or Series C. The remainder of the shares are required to be
redeemed in 25% increments on September 1, 2001, 2002 and 2003. Each holder of
Series A, Series B and Series C has the number of votes equal to the numbers of
shares of common stock into which the preferred stock is then convertible. Due
to the mandatory redemption feature, these securities are classified at their
redemption value (which includes accreted dividends of $1,877,146 at December
31, 1995) outside of stockholders' equity (deficit) in the accompanying balance
sheets.
 
     Future mandatory redemptions of Series A, Series B and Series C redeemable
convertible preferred stock are as follows:
 
<TABLE>
                <S>                                             <C>
                1996..........................................  $    --
                1997..........................................       --
                1998..........................................       --
                1999..........................................       --
                2000..........................................     4,727,027
                Thereafter....................................    14,181,079
                                                                ------------
                                                                $ 18,908,106
                                                                ============
</TABLE>
 
(7) BRIDGE FINANCING -- RELATED PARTIES
 
     During 1995, the Company issued convertible promissory notes in the
principal amount of $3,028,500 to various Series A and Series B preferred
stockholders. The convertible promissory notes bore interest at 10% per annum
with maturity dates of February and July 1996. Principal plus accrued interest
on the convertible promissory notes totaling $3,024,687 were converted into
1,512,344 shares of Series C mandatorily redeemable convertible preferred stock
in September 1995 in accordance with the terms of the financing agreement upon
the closing of the Series C mandatorily redeemable convertible preferred stock
sale. One convertible promissory note aggregating $131,952 (principal plus
accrued interest) was repaid to the note holder in September 1995. In connection
with the bridge financing, the Company issued an aggregate of 192,382 bridge
warrants which gave the holders the right to purchase shares of Series C
mandatorily redeemable convertible preferred stock at an exercise price of $2.00
per share for a period of 10 years from the bridge warrant issuance. These
bridge warrants were canceled without exercise immediately prior to the closing
of the Series C mandatorily redeemable convertible preferred stock sale in
September 1995.
 
                                      F-11
<PAGE>   64
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(8) COMMON STOCK AND COMMON STOCK OPTIONS
 
     In April 1992, the Company issued 7,500 shares of common stock in exchange
for consulting services performed on behalf of the Company estimated at $15,000.
Such amount was charged to operations in 1992.
 
     In November 1994, 125,000 shares of common stock were issued to an
executive officer for a price of $0.335 per share, the estimated fair market
value of such stock at that time, as determined by the Board of Directors.
 
     In November 1995, the Board of Directors authorized that Class A common
stock, of which no shares had been issued, and Class B common stock be
designated into one new class called "common stock." Class A and Class B common
shares had the same rights as common stock. Class B common stock issued through
November 1995 is referred to as common stock in the accompanying financial
statements and related footnotes.
 
     In 1992, the Company adopted the 1992 Stock Option Plan (the "1992 Plan")
whereby incentive and nonstatutory stock options may be granted to directors,
employees, and consultants to purchase an aggregate of 121,228 (increased to
300,000 and 425,000 in 1993 and 1995, respectively) shares of the Company's
common stock. The incentive stock options are to be granted at no less than fair
market value at the date of grant, as determined by the Board of Directors. The
nonstatutory option prices are to be determined by the Board of Directors and
may be less than the fair market value. The options are exercisable for a period
of 10 years after the date of grant and generally vest over a four-year period
(note 14).
 
     A summary of activity under the 1992 Plan from January 10, 1992 (inception)
to December 31, 1995 is as follows:
 
<TABLE>
<CAPTION>
                                                                                     PRICE
                                                                     SHARES        PER SHARE
                                                                     -------     -------------
<S>                                                                  <C>         <C>
January 10, 1992 (inception)......................................        --          --
  Granted.........................................................    63,125        $0.20
  Cancelled.......................................................    (2,500)        0.20
                                                                     -------
Balance, December 31, 1992........................................    60,625         0.20
  Granted.........................................................    36,836         0.20
  Exercised.......................................................     --             --
                                                                     -------
Balance, December 31, 1993........................................    97,461         0.20
  Granted.........................................................    56,750      0.20-0.335
  Exercised.......................................................   (75,969)     0.20-0.335
                                                                     -------
Balance, December 31, 1994........................................    78,242      0.20-0.335
  Granted.........................................................   178,000      0.335-1.20
  Exercised.......................................................   (25,242)     0.20-0.335
                                                                     -------
Balance, December 31, 1995 (note 14)..............................   231,000      $0.20-1.20
                                                                     ========
Shares exercisable at December 31, 1995 (note 14).................    47,103      $0.20-0.335
                                                                     ========
</TABLE>
 
     An executive officer of the Company was granted an option to acquire 50,000
shares of common stock at $0.335 per share in October 1995. Such option vested
50% upon date of grant with the remainder vesting ratably on a monthly basis
over the ensuing 30 months. The difference between the estimated fair value of
$1.20 per share (as determined by the Board of Directors) and the
 
                                      F-12
<PAGE>   65
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(8) COMMON STOCK AND COMMON STOCK OPTIONS (CONTINUED)
exercise price at the grant date has been recorded as deferred compensation
($43,250) and is being amortized over the aforementioned vesting period.
Compensation expense for the year ended December 31, 1995 aggregated $23,067.
 
     A newly hired executive officer of the Company was granted an option to
acquire 60,000 shares of common stock at $2.00 per share in March 1996. Such
option vested 20% upon date of grant with the remainder vesting ratably on an
annual basis over the ensuing four years. The difference between the estimated
fair value of $8.00 per share (as determined by the Board of Directors) and the
exercise price at the grant date has been recorded as deferred compensation
($360,000) in the first quarter of 1996 and is being amortized over the
aforementioned vesting period.
 
(9) INCOME TAXES
 
     At December 31, 1995, the Company had available net operating loss
carryforwards ("NOL") of approximately $9,000,000 and $3,000,000 for federal and
state income tax reporting purposes, respectively, which are available to offset
future federal and state taxable income, if any, through 2010 and 1998,
respectively. The Company also has research and development tax credit
carryforwards of approximately $98,000 for federal income tax reporting purposes
which are available to reduce federal income taxes, if any, through 2010.
 
     The Tax Reform Act of 1986 (the "Act") provides for a limitation on the
annual use of NOL and research and development tax credit carryforwards
(following certain ownership changes, as defined by the Act) that could
significantly limit the Company's ability to utilize these carryforwards. The
Company has experienced various ownership changes, as defined by the Act, as a
result of past financings as well as the Offering. Accordingly, the Company's
ability to utilize the aforementioned carryforwards may be limited.
Additionally, because U.S. tax laws limit the time during which these
carryforwards may be applied against future taxes, the Company may not be able
to take full advantage of these attributes for federal income tax purposes.
 
     The tax effects of temporary differences that give rise to significant
portions of the deferred tax assets and deferred tax liability at December 31,
1994 and 1995 are presented below:
 
<TABLE>
<CAPTION>
                                                                    1994            1995
                                                                 -----------     -----------
<S>                                                              <C>             <C>
Deferred tax assets:
  Capitalized start-up costs...................................  $   304,524     $   933,010
  Net operating loss carryforwards.............................    2,288,807       3,390,313
  Tax credit carryforward......................................       83,724          98,271
  Recognition of accrued expense for financial statement
     reporting purposes but not for income tax reporting
     purposes..................................................       14,388         121,800
                                                                 -----------     -----------
     Total gross deferred tax assets...........................    2,691,443       4,543,394
  Less valuation allowance.....................................   (2,691,443)     (4,542,453)
                                                                 -----------     -----------
     Total deferred tax assets.................................      --                  941
Deferred tax liability:
  Equipment, due to difference in depreciation.................      --                 (941)
                                                                 -----------     -----------
     Total gross deferred tax liability........................      --                 (941)
                                                                 -----------     -----------
     Net deferred taxes........................................  $   --          $   --
                                                                 ===========     ===========
</TABLE>
 
                                      F-13
<PAGE>   66
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(9) INCOME TAXES (CONTINUED)
     The net change in the total valuation allowance for the years ended
December 31, 1993, 1994 and 1995 were increases of approximately $1,030,000,
$1,410,000 and $1,851,000 respectively, related primarily to additional net
operating losses incurred by the Company.
 
(10) TECHNOLOGY LICENSE
 
     Contemporaneous with the formation of the Company in 1992, the Company
entered into an agreement with SUNY whereby the Company received an option to
acquire a certain technology license. In return for this option, the Company
issued to another party (which had previously licensed the technology from SUNY)
498,000 shares of Series A mandatorily redeemable convertible preferred stock
and issued SUNY 54,552 shares of common stock. In November 1992, the Company
issued an additional 24,396 shares of common stock to SUNY in accordance with
the terms of the technology license in order to maintain SUNY's ownership at 5%
(which requirement ceased upon the Company having raised $3,000,000 of
financing). The Company recorded a $513,789 charge to research and development
expense in the 1992 statement of operations in connection with these stock
issuances.
 
     The Company's option to acquire the license was exercised in 1994 and
remains in effect for a period not to exceed 20 years from the date of the first
sale of product incorporating the technology under license or the last to expire
of the licensed patents in each country. The Company is liable to SUNY for
annual royalty fees based on net sales, if any, as defined in the agreement. A
minimum annual royalty is required for the duration of the technology license.
The Company paid royalties in 1994 and 1995 aggregating $15,750 and $50,000,
respectively.
 
     The Company also agreed to pay $200,000 relating to certain research and
development programs at SUNY in connection with the aforementioned license. The
$200,000 was paid in five installments of $40,000 with the final installment
being paid in April 1994. Such costs have been charged to operations in the
accompanying statements of operations totaling $80,000, $40,000, none and
$200,000 for the years ended December 31, 1993, 1994 and 1995 and the period
from January 10, 1992 (inception) to December 31, 1995, respectively.
 
     The agreement also requires the Company to reimburse SUNY for costs
incurred in connection with preparing, filing and maintaining certain patents
and patent applications associated with the licensed technology. During the
years ended December 31, 1993, 1994, 1995 and the period from January 10, 1992
(inception) to December 31, 1995, such costs amounted to approximately $182,000,
$44,000, $177,000 and $429,000, respectively, and are reflected in the
accompanying statements of operations.
 
     The Company has also committed to support certain additional research
efforts at SUNY. The amounts paid to SUNY for these research efforts aggregated
$80,000 in 1995 (none in 1993 and 1994). The Company has remaining commitments
to SUNY with respect to such additional research efforts aggregating $80,000 per
year during 1996 and 1997.
 
(11) COMMITMENTS
 
     In January 1995, the Company entered into an exclusive supply agreement
with a vendor to purchase a principal raw material component required for its
product that is currently under development. This supply agreement expires in
January 2000 with automatic two-year renewal periods. There are no minimum
purchase commitments applicable to such agreement.
 
                                      F-14
<PAGE>   67
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(12) 401(K) SALARY REDUCTION PLAN
 
     In January 1995, the Company adopted a 401(k) Salary Reduction Plan (the
"401(k) Plan") available to all employees meeting certain eligibility
requirements. The 401(k) Plan permits participants to contribute up to 15% of
their salary not to exceed the limits established by the Internal Revenue Code.
All contributions made by participants vest immediately in the participant's
account. The Company did not make any "matching contributions" in 1995 in
accordance with the terms of the 401(k) Plan.
 
(13) CONTRACT RESEARCH AGREEMENTS
 
     From November 1992 through 1994, the Company entered into a contract
research agreement with a company to provide certain clinical monitoring, data
management, statistical analysis and regulatory services on behalf of the
Company. The Company was billed by the research company as such contract
research services were performed. Costs incurred under this agreement aggregated
approximately $1,509,000, $46,000, none and $1,958,000 for the years ended
December 31, 1993, 1994 and 1995 and the period from January 10, 1992
(inception) to December 31, 1995, respectively.
 
     In September 1994, the Company entered into a contract research agreement
with another research company to provide certain clinical monitoring, data
management, statistical analysis and regulatory services on behalf of the
Company. The Company is billed by the research company as research services are
performed. Costs incurred under this agreement aggregated approximately
$629,000, $1,679,000 and $2,308,000 for the years ended December 31, 1994, 1995
and the period from January 10, 1992 (inception) to December 31, 1995,
respectively.
 
(14) SUBSEQUENT EVENTS
 
     Reverse Stock Split
 
     On April 10, 1996, the Company effected a one-for-two reverse stock split
of all outstanding shares of common stock including shares issuable under any
share option plan. All common share, per share and pro forma per share amounts
in the accompanying financial statements have been retroactively restated to
reflect this reverse stock split.
 
     Amendment of 1992 Stock Option Plan and Adoption of 1996 Stock Option Plan
 
     In March 1996, the Board of Directors authorized an amendment to the 1992
Plan reducing the number of shares underlying such plan to 291,000 shares,
stating that no further options may be granted under the 1992 Plan and,
ultimately, that the 1992 Plan will terminate upon the expiration or exercise of
all options currently issued but unexercised (note 8). Further, it approved the
1996 Stock Option Plan (the "1996 Plan") allowing the granting of incentive
stock options and nonstatutory stock options aggregating 750,000 options to
employees and consultants. The incentive stock options are to be granted at an
exercise price no less than the fair market value at the date of grant, except
for employees who own more than 10% of the voting power of all classes of stock
at the time of grant. The exercise price for options granted to these employees
must be at least 110% of the fair market value at the date of grant. The
nonstatutory options are to be granted at an exercise price of at least 110% of
the fair market value at the date of grant for all individuals who own more than
10% of the voting power of all classes of stock at the time of grant. Any other
nonstatutory options granted must have exercise prices of no less than 85% of
the fair market value at the date of grant.
 
                                      F-15
<PAGE>   68
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
(14)  SUBSEQUENT EVENTS (CONTINUED)
     Adoption of 1996 Non-employee Director Stock Option Plan
 
     In March 1996, the Board of Directors approved a nonqualified plan for the
issuance of stock options to non-employee directors under the Non-Employee
Director Stock Option Plan (the "Non-Employee Directors' Plan"). Directors who
are employees of the Company are not eligible to receive stock options under the
Non-Employee Directors' Plan. Under the Non-Employee Directors' Plan, 109,000
shares of common stock are reserved for issuance at an exercise price equal to
fair market value on the date of grant. Such options vest 20% per year
commencing one year from the date of grant.
 
     Initial Public Offering
 
     In March 1996, the Board of Directors authorized the filing of a
registration statement for the Offering with the Securities and Exchange
Commission for the sale of 2,150,000 shares of common stock. If the Offering is
consummated under terms presently anticipated, all shares of Series A, Series B
and Series C mandatorily redeemable convertible preferred stock outstanding as
of the closing date of the offering will be automatically converted into shares
of common stock on a one-for-two basis, and no dividends will be payable with
respect to such preferred stock.
 
   
     On June 19, 1996, the Board of Directors authorized a reduction in the
number of shares of common stock to be sold in the offering from 2,150,000
shares to 2,000,000 shares.
    
 
     Pro Forma Balance Sheet
 
     The unaudited pro forma balance sheet as of December 31, 1995 reflects the
conversion of the existing 10,398,248 shares of mandatorily redeemable
convertible preferred stock into 5,199,124 shares of common stock (effected for
the one-for-two reverse common stock split), which conversion is contingent upon
the closing of the Offering.
 
     Preferred Stock and Common Stock
 
     In March 1996, the Board of Directors authorized and, in April 1996 the
stockholders approved, an amendment to the Restated Certificate of
Incorporation. Upon consummation of the Offering, the Company will be authorized
to issue up to 25,000,000 shares of common stock, $0.01 par value, and 5,000,000
shares of preferred stock, $0.01 par value.
 
     Commitment
 
     In April 1996, the Company entered into a manufacturing agreement for the
manufacture of Periostat. Under the terms of this agreement, the Company is
obligated to annual minimum purchase commitments with such vendor for three
years following the date of initial product launch, as defined.
 
   
     Mandatorily Redeemable Convertible Preferred Stock
    
 
   
     On June 19, 1996, more than 60% of the holders of Series A, Series B and
Series C mandatorily redeemable convertible preferred stock approved an
amendment to the respective Series A, B and C agreements to reduce the price per
share upon which the mandatory conversion of the preferred stock shall occur
upon the closing of an initial public offering for the sale of the Company's
common stock from not less than $12.00 to not less than $8.00 per share.
    
 
                                      F-16
<PAGE>   69
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                            CONDENSED BALANCE SHEETS
                                 MARCH 31, 1996
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                 PRO FORMA
                                                                MARCH 31,        MARCH 31,
                                                                   1996             1996
                                                               ------------     ------------
<S>                                                            <C>              <C>
ASSETS
Current assets:
  Cash and cash equivalents..................................  $  4,967,629     $  4,967,629
  Prepaid expenses...........................................            --               --
  Deferred offering costs....................................        56,662           56,662
                                                               ------------     ------------
          Total current assets...............................     5,024,291        5,024,291
Equipment, net...............................................        35,911           35,911
Other assets.................................................        17,238           17,238
                                                               ------------     ------------
          Total assets.......................................  $  5,077,440     $  5,077,440
                                                               =============    =============
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable...........................................  $    382,437     $    382,437
  Accrued expenses...........................................       620,000          620,000
                                                               ------------     ------------
          Total current liabilities..........................     1,002,437        1,002,437
                                                               ------------     ------------
Mandatorily redeemable convertible preferred stock (at
  redemption value which includes accreted dividends of
  $2,260,343 in 1996); (converts into 5,199,124 pro forma
  common shares upon consummation of the offering
  contemplated herein):
  Series A convertible preferred stock, $0.01 par value;
     3,500,000 shares authorized, 3,133,000 shares issued and
     outstanding.............................................     4,240,306               --
  Series B convertible preferred stock, $0.01 par value;
     2,000,000 shares authorized, 1,946,268 shares issued and
     outstanding.............................................     3,989,252               --
  Series C convertible preferred stock, $0.01 par value;
     5,350,000 shares authorized, 5,318,980 shares issued and
     outstanding.............................................    11,061,745               --
                                                               ------------     ------------
                                                                 19,291,303               --
Common stockholders' equity (deficit):
  Common stock, $0.01 par value; 6,725,000 shares authorized,
     315,159 shares issued and outstanding in 1996 (5,514,283
     pro forma shares upon conversion).......................         3,152           55,143
  Additional paid-in capital (deficit).......................    (1,765,827)      17,473,485
  Deferred compensation......................................      (300,020)        (300,020)
  Deficit accumulated during the development stage...........   (13,153,605)     (13,153,605)
                                                               ------------     ------------
          Common stockholders' equity (deficit)..............   (15,216,300)       4,075,003
                                                               ------------     ------------
Commitments
          Total liabilities and stockholders' equity
            (deficit)........................................  $  5,077,440     $  5,077,440
                                                               =============    =============
</TABLE>
 
      See accompanying notes to unaudited condensed financial statements.
 
                                      F-17
<PAGE>   70
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                       CONDENSED STATEMENTS OF OPERATIONS
               FOR THE THREE MONTHS ENDED MARCH 31, 1995 AND 1996
              AND FOR THE PERIOD FROM JANUARY 10, 1992 (INCEPTION)
                               TO MARCH 31, 1996
                                  (UNAUDITED)
 
   
<TABLE>
<CAPTION>
                                                                                 FOR THE PERIOD
                                                                                      FROM
                                                                                  JANUARY 10,
                                                     THREE MONTHS ENDED               1992
                                                          MARCH 31,              (INCEPTION) TO
                                                 ---------------------------       MARCH 31,
                                                    1995            1996              1996
                                                 -----------     -----------     --------------
<S>                                              <C>             <C>             <C>
Revenues.......................................  $        --     $        --      $          --
                                                    --------        --------           --------
Operating expenses incurred in the development
  stage:
  Research and development.....................    1,089,674         975,742          9,583,437
  General and administrative...................      242,104         418,233          3,704,906
                                                    --------        --------           --------
          Total operating expenses.............    1,331,778       1,393,975         13,288,343
Other income (expense):
  Interest income..............................        9,155          60,857            278,846
  Interest expense.............................      (20,274)             --           (144,108)
                                                    --------        --------           --------
                                                     (11,119)         60,857            134,738
                                                    --------        --------           --------
Net loss.......................................  $(1,342,897)    $(1,333,118)     $ (13,153,605)
                                                    ========        ========           ========
  Accretion of undeclared dividends
     attributable to mandatorily redeemable
     convertible preferred stock...............  $   143,843     $   383,197      $   2,260,343
                                                    ========        ========           ========
Net loss allocable to common stockholders......  $(1,486,740)    $(1,716,315)     $ (15,413,948)
                                                    ========        ========           ========
Pro forma net loss per share...................                  $     (0.24)
                                                                    ========
Shares used in computing pro forma net loss per
  share........................................                    5,545,896
                                                                    ========
</TABLE>
    
 
      See accompanying notes to unaudited condensed financial statements.
 
                                      F-18
<PAGE>   71
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
             CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
     FOR THE PERIOD FROM JANUARY 10, 1992 (INCEPTION) TO DECEMBER 31, 1992,
             FOR THE YEARS ENDED DECEMBER 31, 1993, 1994, AND 1995,
                 AND FOR THE THREE MONTHS ENDED MARCH 31, 1996
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                           COMMON STOCK
                                        ------------------   ADDITIONAL                   DEFICIT ACCUMULATED         COMMON
                                        NUMBER OF    PAR       PAID-IN       DEFERRED          DURING THE         STOCKHOLDERS'
                                         SHARES     VALUE      CAPITAL     COMPENSATION    DEVELOPMENT STAGE     EQUITY (DEFICIT)
                                        ---------   ------   -----------   ------------   --------------------   ----------------
<S>                                     <C>         <C>      <C>           <C>            <C>                    <C>
  Issuance of common stock in exchange
    for technology license in January
    1992, at inception................   $54,552    $  546   $    10,364    $  --             $  --                $     10,910
  Issuance of common stock in exchange
    for consulting services...........     7,500        75        14,925       --                --                      15,000
  Issuance of common stock in exchange
    for technology license in November
    1992..............................    24,396       244         4,635       --                --                       4,879
  Accretion of undeclared dividends on
    mandatorily redeemable convertible
    preferred stock...................     --         --        (190,903)      --                --                    (190,903)
  Net loss............................     --         --         --            --               (1,415,703)          (1,415,703)
                                          ------    --------   ---------   ------------       ------------         ------------  
Balance, December 31, 1992............    86,448       865      (160,979)      --               (1,415,703)          (1,575,817)
  Accretion of undeclared dividends on
    mandatorily redeemable convertible
    preferred stock...................     --         --        (351,072)      --                --                    (351,072)
  Net loss............................        --      --         --            --               (2,482,757)          (2,482,757)
                                          ------    --------   ---------   ------------       ------------         ------------
Balance, December 31, 1993............    86,448       865      (512,051)      --               (3,898,460)          (4,409,646)
  Exercise of common stock options in
    September through November 1994
    ($0.20-$0.335 per share)..........    75,969       760        14,771       --                --                      15,531
  Issuance of common shares to an
    executive officer at $0.335 per
    share in November 1994............   125,000     1,250        40,625       --                --                      41,875
  Accretion of undeclared dividends on
    mandatorily redeemable convertible
    preferred stock...................     --         --        (575,370)      --                --                    (575,370)
  Net loss............................        --      --         --            --               (2,653,465)          (2,653,465)
                                          ------    --------   ---------   ------------       ------------         ------------
Balance, December 31, 1994............   287,417     2,875    (1,032,025)      --               (6,551,925)          (7,581,075)
  Exercise of common stock options in
    February through April 1995 ($0.20
    per share)........................    20,242       202         3,846       --                --                       4,048
  Deferred compensation resulting
    from:
    Grant of options..................        --      --          43,250       (43,250)          --                    --
    Amortization of deferred
      compensation....................     --         --         --             23,067           --                      23,067
  Exercise of common stock options in
    November 1995 ($0.335 per
    share)............................     5,000        50         1,625       --                --                       1,675
  Accretion of undeclared dividends on
    mandatorily redeemable convertible
    preferred stock...................     --         --        (759,801)      --                --                    (759,801)
  Net loss............................        --      --         --            --               (5,268,562)          (5,268,562)
                                          ------    --------   ---------   ------------       ------------         ------------
Balance, December 31, 1995............   312,659     3,127    (1,743,105)      (20,183)        (11,820,487)         (13,580,648)
  Deferred compensation resulting
    from:
    Grant of options (unaudited)......     --         --         360,000      (360,000)          --                    --
    Amortization of deferred
      compensation (unaudited)........     --         --         --             80,163           --                      80,163
  Exercise of common stock options in
    March 1996 ($0.20 per share)
    (unaudited).......................     2,500        25           475       --                --                         500
  Accretion of undeclared dividends on
    mandatorily redeemable convertible
    preferred stock (unaudited).......     --         --        (383,197)      --                --                    (383,197)
  Net loss (unaudited)................     --         --         --            --               (1,333,118)          (1,333,118)
                                          ------    --------   ---------   ------------       ------------         ------------
Balance, March 31, 1996 (unaudited)...   315,159    $3,152   $(1,765,827)   $ (300,020)       $(13,153,605)        $(15,216,300)
                                          ======    ========   =========   ============       ============         ============
</TABLE>
 
      See accompanying notes to unaudited condensed financial statements.
 
                                      F-19
<PAGE>   72
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                       CONDENSED STATEMENTS OF CASH FLOWS
               FOR THE THREE MONTHS ENDED MARCH 31, 1995 AND 1996
              AND FOR THE PERIOD FROM JANUARY 10, 1992 (INCEPTION)
                               TO MARCH 31, 1996
                                  (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                                           FOR THE
                                                                                         PERIOD FROM
                                                               THREE MONTHS ENDED        JANUARY 10,
                                                                   MARCH 31,                 1992
                                                           --------------------------    (INCEPTION)
                                                                                         TO MARCH 31,
                                                              1995           1996            1996
                                                           -----------    -----------    ------------
<S>                                                        <C>            <C>            <C>
Cash flows from operating activities:
  Net loss allocable to common stockholders.............   $(1,486,740)   $(1,716,315)   $(15,413,948)
  Adjustments to reconcile net loss to net cash
    used in operating activities:
    Accretion of undeclared dividends attributable to
       mandatorily redeemable convertible preferred
       stock............................................       143,843        383,197       2,260,343
    Non-cash research and development expense...........            --             --         513,789
    Compensation expense................................            --         80,163         103,230
    Non-cash consulting expense.........................            --             --          15,000
    Accrued interest converted to preferred stock.......            --             --         121,187
    Depreciation and amortization expense...............           166            983           7,696
    Change in assets and liabilities:
       (Increase) decrease in prepaid expenses..........       (22,215)         7,282              --
       Increase in deferred offering costs..............       --             (56,662)        (56,662)
       Increase in other assets.........................            --         (6,047)        (16,436)
       Increase (decrease) in accounts payable..........      (144,219)       364,765         382,437
       Increase in accrued expenses.....................        64,011        125,145         620,000
                                                              --------     ----------     -----------
    Net cash used in operating activities...............    (1,445,154)      (817,489)    (11,463,364)
                                                              --------     ----------     -----------
Cash flows from investing activities:
  Organizational costs..................................            --             --          (5,000)
  Capital expenditures..................................        (3,196)       (21,817)        (39,409)
                                                              --------     ----------     -----------
    Net cash used in investing activities...............        (3,196)       (21,817)        (44,409)
                                                              --------     ----------     -----------
Cash flows from financing activities:
  Proceeds from issuance of preferred stock.............            --             --      13,508,273
  Proceeds from issuance of common stock................           500            500          63,629
  Proceeds from issuance of promissory notes............     2,000,000             --       3,028,500
  Repayment of promissory note..........................            --             --        (125,000)
                                                              --------     ----------     -----------
    Net cash provided by financing activities...........     2,000,500            500      16,475,402
                                                              --------     ----------     -----------
Net increase (decrease) in cash and cash equivalents....       552,150       (838,806)      4,967,629
Cash and cash equivalents at beginning of period........       617,384      5,806,435              --
                                                              --------     ----------     -----------
Cash and cash equivalents at end of period..............   $ 1,169,534    $ 4,967,629    $  4,967,629
                                                              ========     ==========     ===========
Supplemental disclosure of cash flows information --
  cash paid for interest................................            --             --    $     22,921
                                                              ========     ==========     ===========
Supplemental schedule of non-cash financing activities:
  Conversion of promissory notes plus accrued
    interest to preferred stock.........................   $   --         $   --         $  2,903,500
                                                              ========     ==========     ===========
  Deferred compensation.................................   $   --         $   360,000    $    403,250
                                                              ========     ==========     ===========
</TABLE>
 
      See accompanying notes to unaudited condensed financial statements.
 
                                      F-20
<PAGE>   73
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                    NOTES TO CONDENSED FINANCIAL STATEMENTS
                            MARCH 31, 1995 AND 1996
                                  (UNAUDITED)
 
(1) BASIS OF PRESENTATION
 
     The unaudited condensed financial statements included herein have been
prepared by the Company, without audit, pursuant to the rules and regulations of
the Securities and Exchange Commission and in accordance with generally accepted
accounting principles. Certain information and footnote disclosures normally
included in financial statements prepared in accordance with generally accepted
accounting principles have been condensed or omitted pursuant to such rules and
regulations. These unaudited financial statements should be read in conjunction
with the 1995 financial statements and notes thereto.
 
     In the opinion of the Company's management, the accompanying unaudited
condensed financial statements have been prepared on a basis substantially
consistent with the audited financial statements and contain adjustments, all of
which are of a normal recurring nature, necessary to present fairly its
financial position as of March 31, 1996 and its results of operations and cash
flows for the three months ended March 31, 1995 and 1996 and for the period
January 10, 1992 (inception) to March 31, 1996. Interim reports are not
necessarily indicative of results for the full fiscal year.
 
(2) DEFERRED OFFERING COSTS
 
     The deferred offering costs associated with the Offering will be recorded
as a reduction of stockholders' equity (deficit) if the Offering is consummated.
If the Offering is not consummated, the deferred offering costs will be charged
to operations.
 
(3) APPROVAL OF INITIAL PUBLIC OFFERING/CONVERSION OF PREFERRED STOCK
 
     In March 1996, the Board of Directors authorized the Company to file a
registration statement with the Securities and Exchange Commission permitting
the Company to sell approximately 2,150,000 shares (2,472,500 shares if the
underwriters' over-allotment option is exercised in full) of its common stock at
a price per share to be negotiated. If the Offering is consummated under the
terms presently anticipated, all of the Series A, Series B and Series C
mandatorily redeemable convertible preferred stock outstanding at March 31, 1996
will automatically convert on a one-for-two basis into 5,199,124 shares of
common stock. The pro forma (unaudited) balance sheet as of March 31, 1996
reflects the conversion of the Series A, Series B and Series C mandatorily
redeemable convertible preferred stock into shares of common stock, which
conversion is contingent upon the closing of the Offering.
 
   
     On June 19, 1996, the Board of Directors authorized a reduction in the
number of shares of common stock to be sold in the Offering from 2,150,000
shares to 2,000,000 shares (2,300,000 shares if the Underwriters' over-allotment
option is exercised in full).
    
 
(4) AMENDMENT TO RESTATED CERTIFICATE OF INCORPORATION
 
     In March 1996, the Board of Directors authorized and, in April 1996 the
stockholders approved, an amendment to the Restated Certificate of
Incorporation. Upon consummation of the Offering, the Company will be authorized
to issue up to 25,000,000 shares of common stock $0.01 par value, and 5,000,000
shares of preferred stock $0.01 par value.
 
                                      F-21
<PAGE>   74
 
                        COLLAGENEX PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
             NOTES TO CONDENSED FINANCIAL STATEMENTS -- (CONTINUED)
 
(5) COMMON STOCK OPTIONS
 
     A newly hired executive officer of the Company was granted an option to
acquire 60,000 shares of common stock at $2.00 per share in March 1996. Such
option vested 20% upon date of grant with the remainder vesting ratably on an
annual basis over the ensuing four years. The difference between the estimated
fair value of $8.00 per share (as determined by the Board of Directors) and the
exercise price at the grant date has been recorded as deferred compensation
($360,000) in the first quarter of 1996 and is being amortized over the
aforementioned vesting period.
 
(6) COMMITMENT
 
     In April 1996, the Company entered into a manufacturing agreement for the
manufacture of Periostat. Under the terms of this agreement, the Company is
obligated to annual minimum purchase commitments with such vendor for three
years following the date of initial product launch, as defined.
 
   
(7) MANDATORILY REDEEMABLE CONVERTIBLE PREFERRED STOCK
    
 
   
     On June 19, 1996, more than 60% of the holders of Series A, Series B and
Series C mandatorily redeemable convertible preferred stock approved an
amendment to the respective Series A, B and C agreements to reduce the price per
share upon which the mandatory conversion of the preferred stock shall occur
upon the closing of an initial public offering for the sale of the Company's
common stock from not less than $12.00 to not less than $8.00 per share.
    
 
                                      F-22
<PAGE>   75
 
- ------------------------------------------------------
- ------------------------------------------------------
 
     NO PERSON HAS BEEN AUTHORIZED IN CONNECTION WITH THE OFFERING MADE HEREBY
TO GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE
RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR ANY UNDERWRITER. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF ANY OFFER
TO BUY ANY OF THE SECURITIES OFFERED HEREBY TO ANY PERSON OR BY ANYONE IN ANY
JURISDICTION IN WHICH IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION. NEITHER
THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION CONTAINED HEREIN IS
CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Prospectus Summary....................    3
Risk Factors..........................    5
Use of Proceeds.......................   14
Dividend Policy.......................   14
Capitalization........................   15
Dilution..............................   16
Selected Financial Data...............   17
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................   18
Business..............................   21
Management............................   34
Certain Transactions..................   41
Principal Stockholders................   42
Description of Capital Stock..........   44
Shares Eligible for Future Sale.......   47
Underwriting..........................   48
Legal Matters.........................   49
Experts...............................   49
Additional Information................   49
Index to Financial Statements.........  F-1
</TABLE>
    
 
                               ------------------
 
     UNTIL                , 1996 (25 DAYS AFTER THE DATE OF THIS PROSPECTUS),
ALL DEALERS EFFECTING TRANSACTIONS IN THE COMMON STOCK OFFERED HEREBY, WHETHER
OR NOT PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A
PROSPECTUS. THIS IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER A
PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD
ALLOTMENTS OR SUBSCRIPTIONS.
 
- ------------------------------------------------------
- ------------------------------------------------------
 
- ------------------------------------------------------
- ------------------------------------------------------
 
   
                                2,000,000 SHARES
    
 
                                     [LOGO]
 
                                  COMMON STOCK
 
                              -------------------
                                   PROSPECTUS
                              -------------------
 
                               ALEX. BROWN & SONS
                INCORPORATED
 
                             VOLPE, WELTY & COMPANY
 
                                         , 1996
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   76
 
                                    PART II
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The following table sets forth an itemized estimate of fees and expenses
payable by the registrant in connection with the offering described in this
registration statement, other than underwriting discounts and commissions:
 
<TABLE>
    <S>                                                                     <C>
    SEC registration fee..................................................  $ 12,788.79
    NASD filing fee.......................................................     4,209.00
    Nasdaq/NNM listing fee................................................    36,660.71
    Counsel fees and expenses.............................................   160,000.00
    Accounting fees and expenses..........................................   130,000.00
    Blue sky fees and expenses............................................    15,000.00
    Printing expenses.....................................................   125,000.00
    Transfer agent and registrar fees.....................................     3,500.00
    Miscellaneous.........................................................    12,841.50
                                                                            -----------
      Total...............................................................  $500,000.00
                                                                            ===========
</TABLE>
 


ITEM 14.  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 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 in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
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 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 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 in connection with the defense or settlement of such action or
suit if he acted in good faith and in a manner he 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 shall be indemnified against expenses (including attorneys'
fees) actually and reasonably incurred by him in connection therewith; that
 
                                      II-1
<PAGE>   77
 
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 incurred by him in any such capacity or
arising out of his status as such whether or not the corporation would have the
power to indemnify him against such liabilities under Section 145.
 
     Article IX of the registrant's By-laws specifies that the registrant 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 the registrant 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 the Company
is required to adopt, amend or repeal such provision of the By-laws.
 
     The registrant has executed indemnification agreements with each of its
officers and directors pursuant to which the registrant 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 the Company.
 
     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 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. The
registrant'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 the Company is required to amend such provisions.
 
     The registrant intends to obtain liability insurance for the benefit of its
directors and officers which will provide coverage for losses of directors and
officers for liabilities arising out of claims against such persons acting as
directors or officers of the registrant (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.
 
     At present, there is no pending litigation or proceeding involving a
director or officer of the registrant as to which indemnification is being
sought nor is the registrant aware of any threatened litigation that may result
in claims for indemnification by any director or officer.
 
     Reference is made to Section 8 of the Underwriting Agreement, the proposed
form of which is filed as Exhibit One, in which the underwriters agree to
indemnify the directors and officers of the registrant and certain other
persons, against certain civil liabilities, including certain liabilities under
the Securities Act of 1933, as amended (the "Act").
 
                                      II-2
<PAGE>   78
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES.
 
     The following information relates to all securities of the registrant sold
by the registrant within the past three years which were not registered under
the Act:
 
          1. On each of September 24, 1993 and November 22, 1993 the registrant
             issued 1,498,507 and 447,761 shares of Series B Preferred Stock,
             respectively, to six venture capital and investment funds for an
             aggregate purchase price of $2,510,000 and $750,000, respectively.
 
          2. On November 23, 1994, the registrant issued to an executive officer
             of the Company 125,000 shares of Common Stock (on a post-reverse
             stock split recapitalization basis) for an aggregate purchase price
             of $41,875.
 
          3. On each of September 29, 1995 and November 13, 1995, the registrant
             issued 3,068,980 and 2,250,000 shares of Series C Preferred Stock,
             respectively, to "accredited investors" (as that term is defined in
             Rule 501 adopted under the Act) for an aggregate purchase price of
             $6,137,960 and $4,500,000, respectively.
 
          4. The registrant from time to time has granted stock options to
             employees, directors and consultants. The following table sets
             forth certain information (on a post-reverse stock split
             recapitalization basis) regarding such grants:
 
<TABLE>
<CAPTION>
                                                                   NO. OF SHARES     RANGE OF EXERCISE PRICES
                                                                   -------------     ------------------------
        <S>  <C>                                                   <C>               <C>
             1993................................................      36,836                 $0.20
             1994................................................      56,750              0.20 - 0.335
             1995................................................     178,000              0.335 - 1.20
             1996 (through March 31).............................      60,000                  2.00
</TABLE>
 
          5. The registrant from time to time has issued stock to employees,
             directors and consultants pursuant to the exercise of stock
             options. The following table sets forth certain information (on a
             post-reverse stock split recapitalization basis) regarding such
             issuances:
 
<TABLE>
<CAPTION>
                                                                  NO. OF SHARES     RANGE OF EXERCISE PRICES
                                                                  -------------     ------------------------
        <S>  <C>                                                  <C>               <C>
             1993...............................................           0                  N/A
             1994...............................................      75,969                 $0.20
             1995...............................................      25,242                  0.20
             1996 (through March 31)............................       2,500                  0.20
</TABLE>
 
     No underwriter was employed by the registrant in connection with the
issuance and sale of the securities described above. The registrant claims that
the issuance and sale of all of the foregoing securities were exempt from
registration under either (i) Section 4(2) of the Act as transactions not
involving any public offering, or (ii) Rule 701 under the Act as transactions
made pursuant to a written compensatory benefit plan or pursuant to a written
contract relating to compensation, and with respect to the securities described
in paragraph 3 above, Rule 506 adopted under the Act, no public offering having
been involved and securities having been acquired for investment and not with a
view to distribution. Appropriate legends were affixed to the stock certificates
issued in such transactions. All recipients had adequate access to information
about the registrant.
 
                                      II-3
<PAGE>   79
 
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENTS.
 
     (a) Exhibits
 
   
<TABLE>
<CAPTION>
EXHIBIT NO.                               DESCRIPTION OF EXHIBIT
- -----------   -------------------------------------------------------------------------------
<S>           <C>
 +1           Form of Underwriting Agreement.
 +3.1         Amended and Restated Certificate of Incorporation.
 +3.2         Amended and Restated Bylaws.
 +4.1         Registration Rights Agreement dated September 29, 1995 by and among the Company
              and certain investors, as supplemented.
 +4.2         Letter dated December 16, 1993 re: certain rights of the Company with respect
              to certain securities of the Company owned by Brian M. Gallagher, Ph.D.
  4.3         Fourth Investment Agreement as of September 29, 1995 by and among the Company
              and certain Investors.
 +5           Opinion of Buchanan Ingersoll as to validity of Common Stock.
+10.1(**)     Assignment of, Amendment to and Restatement of Agreement, with all exhibits, as
              amended, and schedules, dated January 13, 1992 by and among the Company,
              Johnson & Johnson Consumer Products, Inc. and Research Foundation of State
              University of New York.
+10.2(**)     Supply Agreement dated January 23, 1995 between the Company and Hovione
              International Limited.
+10.3(**)     Manufacturing Agreement as of April 12, 1996 by and between the Company and
              Applied Analytical Industries, Inc.
+10.4         Form of Non-Disclosure Agreement executed by all Employees as employed from
              time to time.
+10.5         Form of Non-Competition Agreement executed by each of Brian M. Gallagher,
              Ph.D., Nancy C. Broadbent and Robert A. Ashley.
+10.6         Form of Mutual Non-Disclosure Agreement executed by certain consultants and
              research collaborators as retained from time to time.
+10.7         Form of Indemnification Agreement executed by each of the Company's directors
              and officers.
+10.8         Forms of Consulting Agreement executed by each of Lorne M. Golub and Thomas F.
              McNamara.
+10.9         Form of Material Transfer Agreement between the Company and Researchers.
+10.10        Lease Agreement dated September 5, 1995 between the Company and Stocking Works
              Associates.
+10.11        Master Consulting Agreement dated September 19, 1994 between the Company and
              Quintiles, Inc.
+10.12        1992 Stock Option Plan of the Company, as amended to date.
+10.13        1996 Stock Plan of the Company.
+10.14        1996 Non-Employee Director Stock Option Plan of the Company.
 11           Statement re computation of per share earnings.
+16           Letter re: Change in Certifying Accountants.
 23.1         Consent of KPMG Peat Marwick LLP.
+23.2         Consent of Buchanan Ingersoll (contained in the opinion filed as Exhibit 5 to
              the Registration Statement).
 23.3         Consent of Hoffmann & Baron.
+24           Powers of Attorney of certain officers and directors of the Company (contained
              on the signature page of this Registration Statement).
 27.1         Financial Data Schedule (Year).
 27.2         Financial Data Schedule (3 Months).
</TABLE>
    
 
- ---------------
** Confidential treatment has been requested for a portion of this Exhibit.
 
 + Previously filed.
 
                                      II-4
<PAGE>   80
 
     (b) Financial Statement Schedules
 
         None
 
     All financial statement schedules are omitted because the information is
not required, or is otherwise included in the consolidated financial statements
or the notes thereto.
 
ITEM 17.  UNDERTAKINGS.
 
     The undersigned registrant hereby undertakes that:
 
          (1) Insofar as indemnification for liabilities arising under the Act
              may be permitted to directors, officers, and controlling persons
              of the registrant pursuant to the provisions described in Item 14,
              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 Act and is, therefore,
              unenforceable. In the event that a claim for indemnification
              against such liabilities (other than the payment by the registrant
              of expenses incurred or paid by a director, officer or controlling
              person of the registrant in the successful defense of any action,
              suit or proceeding) is asserted by such director, officer or
              controlling person in connection with the securities being
              registered, the registrant will, unless in the opinion of its
              counsel the matter has been settled by controlling precedent,
              submit to a court of appropriate jurisdiction the question whether
              such indemnification by it is against public policy as expressed
              in the Act and will be governed by the final adjudication of such
              issue.
 
          (2) For purposes of determining any liability under the Act, the
              information omitted from the form of prospectus filed as part of
              this registration statement in reliance upon Rule 430A and
              contained in a form of prospectus filed by the registrant pursuant
              to Rule 424(b)(1) or (4) or 497(h) under the Act shall be deemed
              to be part of this registration statement as of the time it was
              declared effective.
 
          (3) For the purpose of determining any liability under the Act each
              post-effective amendment that contains a form of prospectus 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.
 
          (4) To provide to the Underwriters at the closing specified in the
              Underwriting Agreement, certificates in such denominations and
              registered in such names as required by the Underwriters to permit
              prompt delivery to each purchaser.
 
                                      II-5
<PAGE>   81
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the Township of
Newtown, Commonwealth of Pennsylvania, on June 19, 1996.
    
 
                                          CollaGenex Pharmaceuticals, Inc.
 
                                          By: /s/  BRIAN M. GALLAGHER
 
                                            ------------------------------------
                                            Brian M. Gallagher, Ph.D., President
                                              and
                                            Chief Executive Officer
 
     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.
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                 TITLE                     DATE
- ---------------------------------------------  --------------------------------  --------------
<C>                                            <S>                               <C>
                       *                       Chairman                          June 19, 1996
- ---------------------------------------------
        Helmer P.K. Agersborg, Ph.D.
       /s/  BRIAN M. GALLAGHER, PH.D.          President and Chief Executive     June 19, 1996
- ---------------------------------------------  Officer and Director (Principal
          Brian M. Gallagher, Ph.D.            Executive Officer)
           /s/  NANCY C. BROADBENT             Chief Financial Officer and       June 19, 1996
- ---------------------------------------------  Treasurer (Principal Financial
             Nancy C. Broadbent                and Accounting Officer)
                       *                       Director                          June 19, 1996
- ---------------------------------------------
              Robert J. Easton
                       *                       Director                          June 19, 1996
- ---------------------------------------------
              James E. Daverman
                       *                       Director                          June 19, 1996
- ---------------------------------------------
        Stephen W. Ritterbush, Ph.D.
                       *                       Director                          June 19, 1996
- ---------------------------------------------
             Pieter J. Schiller
                       *                       Director                          June 19, 1996
- ---------------------------------------------
          Terence E. Winters, Ph.D.
</TABLE>
    
 
- ---------------
* By her 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 persons
  indicated.
 
<TABLE>
<C>                                            <S>                               <C>
      By:      /s/  NANCY C. BROADBENT
- ---------------------------------------------
    Nancy C. Broadbent (Attorney-in-fact)
</TABLE>
 
                                      II-6
<PAGE>   82
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT                                                                         SEQUENTIAL
  NUMBER                                DESCRIPTION                              PAGE NUMBER
- ----------   ------------------------------------------------------------------  -----------
<S>          <C>                                                                 <C>
 +1          Form of Underwriting Agreement....................................
 +3.1        Amended and Restated Certificate of Incorporation.................
 +3.2        Amended and Restated Bylaws.......................................
 +4.1        Registration Rights Agreement dated September 29, 1995 by and
             among the Company and certain investors, as supplemented..........
 +4.2        Letter dated December 16, 1993 re: certain rights of the Company
             with respect to certain securities of the Company owned by Brian
             M. Gallagher, Ph.D................................................
  4.3        Fourth Investment Agreement as of September 29, 1995 by and among
             the Company and certain Investors.................................
 +5          Opinion of Buchanan Ingersoll as to validity of Common Stock......
+10.1(**)    Assignment of, Amendment to and Restatement of Agreement, with all
             exhibits, as amended, and schedules, dated January 13, 1992 by and
             among the Company, Johnson & Johnson Consumer Products, Inc. and
             Research Foundation of State University of New York...............
+10.2(**)    Supply Agreement dated January 23, 1995 between the Company and
             Hovione International Limited.....................................
+10.3(**)    Manufacturing Agreement as of April 12, 1996 by and between the
             Company and Applied Analytical Industries, Inc....................
+10.4        Form of Non-Disclosure Agreement executed by all Employees as
             employed from time to time........................................
+10.5        Form of Non-Competition Agreement executed by each of Brian M.
             Gallagher, Ph.D., Nancy C. Broadbent and Robert A. Ashley.........
+10.6        Form of Mutual Non-Disclosure Agreement executed by certain
             consultants and research collaborators as retained from time to
             time..............................................................
+10.7        Form of Indemnification Agreement executed by each of the
             Company's directors and officers..................................
+10.8        Forms of Consulting Agreement executed by each of Lorne M. Golub
             and Thomas F. McNamara............................................
+10.9        Form of Material Transfer Agreement between the Company and
             Researchers.......................................................
+10.10       Lease Agreement dated September 5, 1995 between the Company and
             Stocking Works Associates.........................................
+10.11       Master Consulting Agreement dated September 19, 1994 between the
             Company and Quintiles, Inc........................................
+10.12       1992 Stock Option Plan of the Company, as amended to date.........
+10.13       1996 Stock Plan of the Company....................................
+10.14       1996 Non-Employee Director Stock Option Plan of the Company.......
 11          Statement re computation of per share earnings....................
+16          Letter re: Change in Certifying Accountants.......................
 23.1        Consent of KPMG Peat Marwick LLP..................................
+23.2        Consent of Buchanan Ingersoll (contained in the opinion filed as
             Exhibit 5 to the Registration Statement)..........................
 23.3        Consent of Hoffmann & Baron.......................................
+24          Powers of Attorney of certain officers and directors of the
             Company (contained on the signature page of this Registration
             Statement)........................................................
 27.1        Financial Data Schedule (Year)....................................
 27.2        Financial Data Schedule (3 Months)................................
</TABLE>
    
 
- ---------------
** Confidential treatment has been requested for a portion of this Exhibit.
 
 + Previously filed.

<PAGE>   1
                          FOURTH INVESTMENT AGREEMENT

        This FOURTH INVESTMENT AGREEMENT (the "Agreement") is entered into as
of September 29, 1995, by and among COLLAGENEX, INC., a Delaware corporation
(the "Corporation"), MARQUETTE VENTURE PARTNERS II, L.P., a Delaware limited
partnership ("Marquette"), COLUMBINE VENTURE FUND, II, L.P., a Delaware limited
partnership and THE VENTURE FUND OF WASHINGTON, L.P., a Delaware limited
partnership ("The Venture Fund"), UNCO VENTURES, LTD., a Texas limited
partnership ("UNCO"), MVP II AFFILIATES FUND, L.P., a Delaware limited
partnership ("MVP"), JOHNSON & JOHNSON DEVELOPMENT CORPORATION, a New Jersey
corporation ("J&J Development"), ADVANCED TECHNOLOGY VENTURES III, L.P., a
Delaware limited partnership ("ATV"), NEW YORK LIFE INSURANCE COMPANY, a New
York corporation ("New York Life"), CRAIG DRILL CAPITAL, a New York partnership
("Craig Drill"), LONGBOW PARTNERS, a New York partnership ("Longbow"), STUART
SCHUBE ("Schube") and JOAN SCHWARTZ EASTON ("Easton"). Marquette, Columbine,
UNCO, MVP, J&J Development, ATV, New York Life, Craig Drill, Longbow, Schube
and Easton are hereinafter sometimes individually referred to as an "Investor"
and collectively referred to as the "Investors."

                                   RECITALS:

        The Investors desire to purchase, for cash, shares of the Corporation's
Series C Convertible Preferred Stock (herein referred to as "Series C Stock")
and the Corporation desires to sell such shares on the terms and conditions set
forth below.


<PAGE>   2
        NOW, THEREFORE, the parties hereby agree as follows:

                                   SECTION 1

                 AGREEMENT TO PURCHASE AND SELL SERIES C STOCK

        1.1     Purchase and Sale of Series C Stock.  Subject to the terms and
conditions of this Agreement, the Corporation hereby agrees to sell to
Marquette, Columbine, UNCO, MVP, J&J Development, ATV, New York Life, Craig
Drill, Longbow, Schube and Easton the number of shares of Series C Stock set
forth opposite their names on Exhibit 1.1 hereto, and each such Investor hereby
agrees to purchase from the Corporation such shares of Series C Stock, at a
price of two dollars ($2.00) per share.

        1.2     Closing.  The closing and purchase of the shares of Series C
Stock referenced in Section 1.1 above (hereinafter sometimes referred to as the
"Shares") shall occur at a closing (the "Closing") to be held at the offices of
Berenbaum, Weinshienk & Eason, P.C., 26th Floor, Republic Plaza, 370
Seventeenth Street, Denver, Colorado 80202-5626, 10 a.m. on September 29, 1995,
or at such other place, date and time as may be mutually agreed upon by all
parties hereto. (The date and time of Closing is hereinafter referred to as the
"Closing Date.") Payment for the Series C Stock to be purchased by the
Investors shall be made at the Closing by wire transfer or good bank check
and/or exchange of the principal amount of, and interest accrued through
September 13, 1995 under, Convertible Promissory Notes of the Corporation dated
February 22, 1995, in the aggregate amount of $2,020,000, as set forth in
Exhibit 1.1 and Convertible Promissory Notes of the Corporation dated July 14,
1995, except one Note dated August 4, 1995, in the aggregate amount of
$1,008,500, as set forth in Exhibit 1.1 (collectively called "Notes"). Those
amounts and the Notes shall be deposited with Berenbaum, Weinshienk & Eason,
P.C., 


                                      -2-

<PAGE>   3
counsel for the Investors (herein referred to as "Special Counsel").  At the
Closing, Investors holding stock purchase warrants as set forth opposite their
name in Exhibit 1.1 shall surrender such stock purchase warrants to the
Corporation for cancellation.  The Corporation and such Investors agree that
such warrants shall terminate without any exercise immediately prior to the
Closing.  By its execution of this Agreement, Genesis Fund, Ltd. agrees to
surrender its stock purchase warrant listed in Exhibit 1.1 and agrees with the
Corporation that such warrant shall terminate without exercise immediately prior
to the closing.  Unless advised that the conditions to Closing set forth in
Section 2 hereof have not been satisfied and have not been waived by all of the
Investors, at the Closing Special Counsel shall release the funds and the Notes
to the Corporation, and Special Counsel shall release the fully executed
certificates for the Shares to the Investors purchasing Shares hereunder.  If
the Closing Date is later than September 13, 1995, the Corporation shall
promptly pay the Investors who exchange Notes the interest which has accrued on
such Notes from September 13, 1995 through the Closing Date.  The Corporation
shall promptly cancel the Notes surrendered for exchange. The Corporation shall
promptly pay the principal of, and interest accrued to the date of payment
under, the Corporation's Convertible Promissory Note issued to Genesis Fund,
Ltd. in the principal amount of $125,000.

        1.3     Waiver of Participation Rights.  Execution of this Agreement by
Marquette, Columbine, The Venture Fund, UNCO, CPI and J&J Development shall be
deemed a waiver by each such party of its rights, if any, pursuant to Section 6
of the Investment Agreement dated January 13, 1992 by and among the
Corporation, the Venture Fund, Columbine, UNCO, CPI and J&J Development
(herein referred to as the "First


                                      -3-
<PAGE>   4
Investment Agreement"), pursuant to Section 6 of the Investment Agreement dated
November 19, 1992, between the Corporation and the other parties thereto
(herein referred to as the "Second Investment Agreement") and pursuant to
Section 6 of the Investment Agreement dated September 24, 1993, between the
Corporation and the other parties thereto (herein referred to as the "Third
Investment Agreement") to participate in the financing to be consummated under
this Agreement.  (The First, Second and Third Investment Agreements are herein
collectively referred to as the "Investment Agreements.")  The execution by
such parties and by the Venture Fund of Washington, L.P., who are sufficient to
amend and waive the Investment Agreements shall constitute an amendment and
waiver of Section 6 of each of the Investment Agreements to permit the sale of
the shares without compliance with the procedures therein specified.

        1.4     Additional Sales of Series C Stock.  The Corporation shall have
the right, in its sole discretion, to sell and issue up to an additional 681,020
shares of Series C Stock (the "Additional Shares") to any persons or entities
including one or more of the Investors at a price of not less than $2.00;
provided that the closing of the sale of the Additional Shares is consummated
within 30 days after the Closing.  Each purchaser of Additional Shares shall
execute this Agreement and the Collateral Agreements (as hereafter defined) and
shall be deemed an "Investor" hereunder in all respects and the Additional
Shares issued to such purchaser shall be deemed to be "Shares" hereunder in all
respects.  Exhibit 1.1 shall be amended to reflect the identity of each party
purchasing Additional Shares and the number of Additional Shares purchased by
that entity and Exhibit 3.2(d) shall be amended to reflect the capitalization of
the Corporation following the sale of the


                                      -4-
<PAGE>   5
Additional Shares. Payment for the Additional Shares shall be made by wire
transfer or good bank check.

                                   SECTION 2

                             CONDITIONS TO CLOSING

        The parties' obligations to consummate the transactions contemplated by
this Agreement are subject to the fulfillment of all of the following
conditions, any of which may be waived by the party or parties for whose
benefit such condition is imposed.

        2.1     Truth of Representations and Warranties.  The representations
and warranties made in Sections 3 and 4 hereof, respectively, shall be true and
correct in all respects as of the Closing Date.

        2.2     Performance of Covenants and Obligations.  Each of the parties
shall have performed and complied with all of the obligations and covenants
imposed upon it under this Agreement which are to be performed or complied with
by it prior to the Closing.

        2.3     Stockholders Agreement.  The Amended and Restated Stockholders
Agreement attached hereto as Exhibit 2.3 (herein referred to as the
"Stockholders Agreement") shall have been executed by all of the parties 
thereto.

        2.4     Registration Rights Agreement.  The Registration Rights
Agreement attached hereto as Exhibit 2.4 (herein referred to as the
"Registration Rights Agreement") shall have been executed by all of the parties 
thereto.

        2.5     Non-Competition Agreement.  The Non-Competition Agreement
attached hereto as Exhibit 2.5 (herein referred to as the "Non-Competition
Agreement") shall have been executed by Brian Gallagher and Rob Ashley.



                                      -5-
<PAGE>   6
        2.6     Non-Disclosure and Development Agreement.  The Non-Disclosure
and Development Agreement attached hereto as Exhibit 2.6 (herein referred to as
the "Non-Disclosure and Development Agreement" shall have been executed by
Brian Gallagher and Rob Ashley.

        2.7     No Adverse Proceedings or Events.  No suit, action or other
proceeding against any of the parties hereto, or their respective officers,
directors, partners or affiliates, shall be pending before any court,
governmental agency or arbitration tribunal in which it will be, or it is,
sought to restrain or prohibit any of the transactions contemplated by this
Agreement or by the Stockholders Agreement, Registration Rights Agreement,
Non-Competition Agreements or Non-Disclosure and Development Agreements, as
applicable, or to obtain damages or other relief in connection with this
Agreement or the Stockholders Agreement, the Registration Rights Agreement, the
Non-Competition Agreements or the Non-Disclosure and Development Agreements, or
such documents or the transactions therein contemplated. (For purposes of this
Agreement, the Stockholders Agreement, the Registration Rights Agreement, the
Non-Competition Agreements and the Non-Disclosure and Development Agreements
are referred to as the "Collateral Agreements.")

        2.8     Consents and Actions.  All requisite consents of any third
parties and other actions which are required to consummate the transactions
referenced in this Agreement and the Collateral Agreements shall have been
obtained and completed.

        2.9     Qualifications.  All authorizations, approvals, or permits, if
any, of any governmental authority or regulatory body of the United States or
of any state that are required in connection with the lawful sale and issuance
of the Shares hereunder shall have been obtained.





                                      -6-
<PAGE>   7
        2.10    Amendment to Certificate of Incorporation.  The Certificate of
Amendment to the Corporation's Certificate of Incorporation, a copy of which is
attached hereto as Exhibit 2.10, shall have been filed with the Delaware
Secretary of State.

        2.11    Number of Directors.  The authorized number of Directors of the
Corporation shall have been increased to nine.

        2.12    Legal Opinion.  The Investors shall have received an opinion
from the Corporation's attorneys substantially in the form of the opinion
attached hereto as Exhibit 2.12.

                                   SECTION 3

               REPRESENTATIONS AND WARRANTIES OF THE CORPORATION

        As an inducement to the Investors to purchase the Shares hereunder, the
Corporation hereby represents and warrants to each Investor that the following
statements are true and correct as of the date hereof:

        3.1     Organization, Good Standing and Qualification.  The Corporation
is a corporation duly organized, validly existing and in good standing under the
laws of the State of Delaware and has all requisite corporate power and
authority to carry on the business it now conducts or intends to conduct.  The
Certificate of Incorporation, as amended, and Bylaws of the Corporation attached
hereto as Exhibits 3.1(a) and (b) respectively are true, correct and complete.

        3.2     Capitalization and Voting Rights.  Immediately prior to the
sale of the Shares hereunder, the authorized capital stock of the Corporation
shall consist of:

                (a)  Preferred Stock.  (i) A total of three million five
hundred thousand (3,500,000) shares, par value one cent ($.01), designated as
Series A Convertible




                                      -7-
<PAGE>   8
Preferred Stock, of which three million one hundred and thirty three thousand
(3,133,000) shares are issued and outstanding, (ii) a total of two million
(2,000,000) shares, par value one cent ($.01), designated as Series B
Convertible Preferred Stock (the "Series B Stock"), of which one million four
hundred ninety-eight thousand five hundred seven (1,498,507) shares are issued
and outstanding, and (iii) a total of three million seven hundred fifty
thousand (3,750,000) shares, par value one cent ($.01), designated as Series C
Convertible Preferred Stock (the "Series C Stock"), none of which are issued
and outstanding.  The rights, privileges and preferences of the Series A Stock,
the Series B Stock and the Series C Stock are as stated in the Corporation's
Certificate of Incorporation, as amended, attached hereto as Exhibit 3.1(a)
(herein referred to as the "Certificate of Incorporation").

                (b)  Class A and Class B Common Stock.  A total of ten million
(10,000,000) shares of Class A Common Stock, par value one cent ($.01) (the
"Class A Common Stock"), none of which are issued and outstanding, and a total
of two million (2,000,000) shares of Class B Common Stock, par value one cent
($.01) (the "Class B Common Stock"), of which six hundred fifteen thousand
three hundred thirteen (615,313) shares are issued and outstanding.  The
rights, privileges and preferences of the Class A and Class B Common Stock are
as stated in the Certificate of Incorporation.

                (c)  Options, Warrants and Conversion Rights.  Except for the
issued and outstanding shares of Series A Stock and Series B Stock, the shares
of Series C Stock to be issued hereunder and except as specifically set forth
in this Agreement, the Collateral Agreements, the Investment Agreements, and
the Amended and Restated Agreement by and between the Corporation and The
Research Foundation of the State University of New York dated January 13, 1992
(the "License Agreement") and Exhibit 3.2(c) hereof, there are




                                      -8-
<PAGE>   9
no outstanding convertible or exchangeable securities, options, warrants,
preemptive rights, voting rights agreements, or agreements for the purchase or
acquisition from the Corporation of any shares of its capital stock.

        (d)     Capitalization.  The capitalization of the Corporation
immediately after the sale of all of the Shares at the Closing (assuming this
Agreement is consummated in full as to all Investors, simultaneously) is shown
on Exhibit 3.2(d) attached hereto.

        3.3     Subsidiaries.  The Corporation does not presently own or
control, directly or indirectly, any interest in any other corporation,
association, or other business entity.

        3.4     Authorization.  All corporate action on the part of the
Corporation, its officers, directors and stockholders, necessary for the
authorization, execution and delivery of this Agreement and the Collateral
Agreements, the performance of all obligations of the Corporation hereunder and
thereunder, and the authorization, issuance (or reservation for issuance) and
delivery of the Shares hereunder and the Class A Common Stock issuable upon
conversion of the Shares, has been taken and this Agreement and the Collateral
Agreements constitute valid and legally binding obligations of the Corporation,
enforceable in accordance with their respective terms, except as such
enforcement is limited by bankruptcy, insolvency and similar laws affecting the
enforcement of creditors rights generally and equitable remedies.

        3.5     Valid Issuance of Series C Stock and Class A Common Stock.  The
Shares purchased by the Investors hereunder will be duly and validly issued,
fully paid and nonassessable, free of any preemptive rights or rights of first
refusal (except as set forth in




                                      -9-
<PAGE>   10
the Stockholders Agreement) and, based in part upon the representations and
warranties of the Investors in this Agreement, will be issued in compliance with
all applicable federal securities laws.  The shares of Class A Common Stock
issuable upon conversion of the Shares purchased under this Agreement have been
duly and validly reserved for issuance and, upon issuance in accordance with the
terms of the Certificate of Incorporation, will be duly and validly issued,
fully paid and nonassessable, and issued in compliance with all applicable
securities laws, as presently in effect, of the United States (assuming, for
purposes of the representation as to securities law compliance, (i) no change in
applicable law, (ii) that such Class A Common Stock is issued only to Investors
hereunder and (iii) that the residence of each Investor is as shown on the
signature pages hereto does not change).

        3.6     Governmental Consents.  Assuming the accuracy of the
representations and warranties of the Investors set forth in Section 4 hereof,
respectively, no consent, approval, order or authorization of, or registration,
qualification, designation, declaration or filing with, any federal, state,
local or provincial governmental authority on the part of the Corporation is
required in connection with the issuance and sale of the Shares contemplated by
this Agreement.

        3.7     Litigation.  There is no action, suit, proceeding or
investigation pending or threatened against the Corporation nor is the
Corporation aware that there is any basis for the foregoing.  The Corporation is
not a party or subject to the provisions of any order, writ, injunction,
judgment or decree of any court or government agency or instrumentality.  There
is no action, suit, proceeding or investigation by the Corporation currently
pending or which the Corporation intends to initiate.
<PAGE>   11
        3.8     Compliance with Other Instruments.  The Corporation is not in
violation or default of any provisions of its Certificate of Incorporation or
Bylaws or, to its knowledge, of any provision of federal or state statute, rule
or regulation applicable to the Corporation. The execution, delivery and
performance of this Agreement and the Collateral Agreements by the Corporation
and the consummation of the transactions contemplated hereby and thereby will
not result in any such violation or be in conflict with or constitute, with or
without the passage of time and giving of notice, either a default under any
such provisions in its Certificate of Incorporation, Bylaws or any statute,
rule or regulation or an event which results in the creation of any lien, charge
or encumbrance upon any assets of the Corporation.

        3.9     Material Agreements.  Except for this Agreement and the
agreements set forth on Exhibit 3.9 attached hereto to which it is a party (the
"Listed Agreements"), the Corporation is not a party to or bound by any
agreement or contract that is material, individually, to the future conduct by
the Corporation of its business or the ownership by it of any assets. All of
the Listed Agreements are valid, binding and enforceable in accordance with
their respective terms. The Company has performed all obligations required to
be performed by it under the Listed Agreements and is not in default under or
in breach of nor in receipt of any claim of default or breach under any of the
Listed Agreements; no event has occurred which with the passage of time or the
giving of notice or both would result in a default, breach or event of
noncompliance under any of the Listed Agreements; the Company has no knowledge
of any breach or anticipated breach of the Listed Agreements by the other
parties to the Listed Agreements.


                                      -11-
<PAGE>   12
        3.10    Registration Rights.  Except for the registration rights
granted to the Investors under the Registration Rights Agreement, the
Corporation has not granted or agreed to grant any registration rights,
including piggyback rights, to any person or entity that will survive the
execution of this Agreement and the Registration Rights Agreement.

        3.11    No Property and Assets.  Except for the license rights created
under the agreements set forth on Exhibit 3.9 hereto and any other assets
identified on Exhibit 3.9, the Corporation does not own or lease any material
property or assets, whether real, personal or intangible.

        3.12    Board of Directors.  Immediately following the Closing, the
Board of Directors will consist of Stephen W. Ritterbush, Terence E. Winters,
Gil Smith, H.P.K. Agersborg, Brian Gallagher, Robert Easton, Susan Lambert,
James Daverman and Pieter Schiller.

        3.13    Financial Statements.  Attached hereto as Exhibit 3.13 are the
following financial statements:

                (i)     the unaudited balance sheet of the Corporation as of
December 31, 1994, and the related statements of income and cash flows (or the
equivalent) for the twelve-month period then ended; and

                (ii)    the unaudited balance sheet of the Corporation as of
June 30, 1995 (the "Latest Balance Sheet"), and the related statements of
income and cash flows (or the equivalent) for the four-month period then ended.

Each of the foregoing financial statements (including in all cases the notes
thereto, if any) is accurate and complete in all material respects, is
consistent with the books and records 


                                      -12-

<PAGE>   13
of the Corporation (which, in turn, are accurate and complete in all material
respects) and has been prepared in accordance with generally accepted
accounting principles, consistently applied, subject in the case of the
unaudited financial statements to the lack of footnote disclosure and changes
resulting from normal year-end adjustments (none of which would, alone or in
the aggregate, be materially adverse to the financial condition, operating
results, assets, operations or business prospects of the Corporation).

        3.14    Absence of Undisclosed Liabilities.  Except as set forth on
Exhibit 3.14 hereto, the Corporation does not have any material obligation or
liability (whether accrued, absolute, contingent, unliquidated or otherwise,
whether or not known to the Corporation, whether due or to become due and
regardless of when asserted) arising out of transactions entered into at or
prior to the Closing, or any action or inaction at or prior to the Closing
other than: (i) liabilities set on the Latest Balance Sheet, (ii) liabilities
and obligations which have arisen after the date of the Latest Balance Sheet in
the ordinary course of business (none of which is a liability resulting from
breach of contract, breach of warranty, tort, infringement, claim or lawsuit)
and (iii) other liabilities and obligations expressly disclosed in the other
Exhibits to Section 3 of this Agreement.

        3.15    No Material Adverse Change.  Since the date of the Latest
Balance Sheet, there has been no material adverse change in the financial
condition, operating results, assets, operations, or business prospects of the
Corporation.

        3.16    Absence of Certain Developments.

                (i)     Except as expressly contemplated by this Agreement or
as set forth on Exhibit 3.16 hereto, since the date of the Latest Balance
Sheet, the Corporation has not:




                                      -13-
<PAGE>   14
                        (a)     issued any notes, bonds or other debt
securities or any equity securities or any securities convertible, exchangeable
or exercisable into any equity securities;

                        (b)     borrowed any amount or incurred or become
subject to any material liabilities, except current liabilities incurred in the
ordinary course of business and liabilities under contracts entered into in the
ordinary course of business;

                        (c)     discharged or satisfied any material lien or
encumbrance or paid any material obligation or liability, other than current
liabilities paid in the ordinary course of business;

                        (d)     declared or made any payment or distribution of
cash or other property to its stockholders with respect to its stock or
purchased or redeemed any shares of its stock or any warrants, options or other
rights to acquire its stock;

                        (e)     mortgaged or pledged any of its properties or
assets or subjected them to any lien, security interest, charge or other
encumbrance, except liens for current property taxes not yet due and payable;

                        (f)     sold, assigned or transferred any of its
tangible assets, except in the ordinary course of business, or cancelled any
material debts or claims;

                        (g)     sold, assigned or transferred any patents or
patent applications, trademarks, service marks, trade names, corporate names,
copyrights or copyright registrations, trade secrets or other intangible assets;

                        (h)     suffered any extraordinary losses or waived any
rights of material value, whether or not in the ordinary course of business or
consistent with past practice;





                                      -14-
<PAGE>   15
                        (i)     entered into any other material transaction
other than in the ordinary course of business or entered into any other
material transaction, whether or not in the ordinary course of business; or

                        (j)     suffered any damage, destruction or casualty
loss exceeding in the aggregate $10,000, whether or not covered by insurance.

                (ii)    The Corporation has not at any time made any payments
for political contributions or made any bribes, kickback payments or other
illegal payments.

        3.17    Tax Matters.  The Corporation has filed all tax returns which
it is required to file under applicable laws and regulations; all such returns
are complete and correct in all material respects; the Corporation in all
material respects has paid all taxes due and owing by it and withheld and paid
over all taxes which it is obligated to withhold from amounts paid or owing to
any employee, stockholder, creditor or other third party.

        3.18    Employees.  The Corporation is not aware that any executive or
key employee has any plans to terminate employment with the Corporation. The
Corporation has complied in all material respects with all laws relating to the
employment of labor, including provisions thereof relating to wages, hours,
equal opportunity, collective bargaining and the payment of social security and
other taxes. Neither the Corporation nor, to the best of the Corporation's
knowledge, any of its employees is subject to any non-compete, nondisclosure,
confidentiality, employment, consulting or similar agreements relating to,
affecting or in conflict with the present or proposed business activities of
the Corporation except for agreements between the Corporation and its present
and former employees.

        3.19    Compliance with Laws.  The Corporation has not violated any law
or any governmental regulation or requirement which violation would reasonably
be expected





                                      -15-
<PAGE>   16
to have a material adverse effect upon the financial condition, operating
results, assets, operations or business prospects of the Corporation, and the
Corporation has not received notice of any such violation. The Corporation is
not subject to any clean up liability, and has no reason to believe it may
become subject to any clean up liability, under any federal, state or local
environmental law, rule or regulation. The Corporation, at this time, is not
aware of any facts that would indicate that the United States Food and Drug
Administration ("FDA") has or will prohibit the marketing, sales, license or
use in the United States of any product proposed to be developed, produced or
marketed by the Corporation ("Product"), and the Corporation knows of no
product or process which the FDA has prohibited from being marketed or used in
the United States which in function and composition is substantially similar to
any Product.

        3.20    Proprietary Rights.  Exhibit 3.20 contains a complete and
accurate list of (i) all patented and registered proprietary rights owned by
the Corporation, (ii) all pending patent applications and applications for
registrations of other proprietary rights filed by the Corporation, (iii) all
unregistered trade names and corporate names owned or used by the Corporation
and (iv) all unregistered trademarks, service marks and copyrights which are
material to the financial condition, operating results, assets, operations or
business prospects of the Corporation taken as a whole. Exhibit 3.20 also
contains a complete and accurate list of all licenses and other rights granted
by the Corporation to any third party with respect to any proprietary rights
and all licenses and other rights granted by any third party to the Corporation
with respect to any proprietary rights. The Corporation owns or has the right
to use pursuant to a valid license all proprietary rights necessary for the
operation of the businesses of the Corporation as presently conducted and as
presently 


                                      -16-


<PAGE>   17
proposed to be conducted. No loss or expiration of any proprietary right or
related group of proprietary rights, to the best of the Corporation's
knowledge, is threatened, pending or reasonably foreseeable. The Corporation
has taken all necessary actions to maintain and protect the proprietary rights
which it owns and use. To the best of the Corporation's knowledge, the owners
of any proprietary rights licensed to the Corporation have taken all necessary
actions to maintain and protect the proprietary rights which are subject to
such licenses. Except as indicated on the Exhibit 3.20, (i) the Corporation
owns or has the right to use pursuant to a valid license all right, title, and
interest in all of the proprietary rights listed on such exhibit and all other
proprietary rights material to the operation of the businesses of the
Corporation, (ii) there have been no claims made against the Corporation
asserting the invalidity, misuse or unenforceability of any such of rights,
and, to the best of the Corporation's knowledge, there are no grounds for the
same, (iii) the Corporation has not received a notice of conflict with the
asserted rights of others within the last five years, and (iv) the conduct of
the Corporation's business has not infringed or misappropriated and does not
infringe or misappropriate any proprietary rights of others, nor would any
future conduct as presently contemplated infringe any proprietary rights of
others and, to the best of the Corporation's knowledge, the proprietary rights
owned by the Corporation have not been infringed or misappropriated by others.



                                      -17-
<PAGE>   18
                                   SECTION 4

                REPRESENTATIONS AND WARRANTIES OF THE INVESTORS

        As an inducement to the Corporation to sell the Shares hereunder, each
Investor, for itself only, hereby represents and warrants to the Corporation and
the other Investors that the following statements are true and correct as of the
date hereof:

        4.1     Authorization.  This Agreement and the Collateral Agreements
constitute the valid and legally binding obligations of the Investor,
enforceable in accordance with their terms, except as such enforcement is
limited by bankruptcy, insolvency and similar laws affecting the enforcement of
creditors rights generally and equitable remedies.  The Investor has all the
requisite power and authority to execute, deliver and perform this Agreement
and the Collateral Agreements.

        4.2     Investment.  The Investor is acquiring the Shares for its own
account for the purpose of investment and not with a view to or for sale in
connection with any distribution thereof.  The Investor further represents that
it understands that (i) neither the Shares nor the shares of Class A Common
Stock issuable upon conversion thereof (hereinafter referred to as the
"Conversion Shares") have been registered under the Securities Act of 1933 (the
"Act") or the securities laws of any state by reason of their issuance in a
transaction exempt from the registration requirements of the Act pursuant to
Section 4(2) thereof, (ii) the Shares and Conversion Shares cannot be sold
unless a subsequent disposition thereof is registered under the Act and any
applicable state securities law or is exempt from such registration, (iii) the
certificates representing the Shares, and the Conversion Shares will bear a
legend to such effect and will also refer to



                                      -18-
<PAGE>   19
the restrictions set forth in the Stockholders Agreement, and (iv) the
Corporation will make a notation on its transfer books to such effect.

        4.3     Disclosure of Information.  The Investor has received all the
information the Investor considers necessary or appropriate for deciding
whether to purchase the Shares.  The Investor further represents that the
Investor has had an opportunity to ask questions and receive answers from the
other Investors and the Corporation regarding the terms and conditions of the
offering of the Shares and has done all due diligence reviews desired by the
Investor.  The foregoing does not, however, limit or modify the representations
and warranties of the Corporation and the other Investors in this Agreement or
the right of the Investor to rely thereon.

        4.4     Investment Experience: Accredited Investor Status.  The Investor
acknowledges that it can bear the economic risk of the Investor's investment and
has such knowledge and experience in financial or business matters that the
Investor is capable of evaluating the merits and risks of the investment in the
Shares.  The Investor also represents it has not been organized for the purpose
of acquiring the Shares.  The Investor represents that it is an "accredited
investor" within the meaning of Regulation D promulgated under the Act.

        4.5     Notice of Proposed Transfers.  The Investor hereby covenants
and agrees that prior to any proposed sale, assignment, transfer or pledge
(each of which is deemed "Transfer") of any of the Shares or Conversion Shares
(collectively the "Securities"), unless there is in effect a registration
statement under the Securities Act of 1933 covering the proposed Transfer of
such Securities, the holder will give written notice to the Corporation of such
holder's intentions to effect such Transfer.  Each


                                      -19-
<PAGE>   20
such notice shall describe the manner and circumstances of the proposed Transfer
in sufficient detail, and, if requested by the Corporation, shall be accompanied
by an unqualified written opinion of legal counsel addressed to the Corporation
prepared at such holder's expense, reasonably satisfactory to the Corporation,
to the effect that the proposed Transfer of the Securities may be effected
without registration under the Securities Act of 1933.  It is agreed that,
notwithstanding such requirement, the Corporation shall not require opinions of
counsel for transactions made pursuant to Rule 144, except as the Corporation
may reasonably and in good faith request.  Notwithstanding the foregoing, no
such registration statement or opinion of counsel will be necessary for a
transfer by any Investor to its partners or affiliates, if in any such case the
transferee agrees in writing to be subject to the terms hereof to the same
extent as if that partner were the Investor hereunder and, in particular, agrees
to be bound by this Section 4.  Notwithstanding the foregoing, each proposed
Transfer shall be subject to the terms and conditions of the Stockholders
Agreement.

                                   SECTION 5

                          COVENANTS OF THE CORPORATION

        Subject to the last paragraph of Section 5.2 regarding earlier
termination as to an Investor or assignee of an Investor, until there is a
public offering which satisfies the criteria set forth in Section 6.4, the
Corporation hereby covenants and agrees that, during such time as any of the
Shares purchased hereunder, any of the shares of Series A Stock or Series B
Stock purchased under any of the Investment Agreements, or any shares of Class
A Common Stock issuable upon conversion of any of the foregoing are
outstanding, the




                                      -20-
<PAGE>   21
Corporation will comply with all the provisions of this Section 5, unless
compliance is waived by the "Majority of Investors" as defined below.

        5.1     Definitions.  Solely for purposes of this Section 5, Section 6,
and Section 7.8, the following definitions shall apply:

                (a)  "Investor" shall refer to each of the parties to this
Agreement, except the Corporation, and "Investors" shall refer collectively to
all of the parties to this Agreement, except the Corporation.  The parties
hereto agree that the covenants of the Corporation set forth in Section 5 and
Section 6 of the First Investment Agreement, the Second Investment Agreement
and the Third Investment Agreement shall be merged into this Agreement and only
the provisions of Section 5 and Section 6 of this Agreement shall survive.

                (b)  "Majority of Investors" shall mean the holders of at least
sixty percent (60%) of the total shares of Class A Common Stock which have been
issued and are issuable upon conversion of the Series A Stock and Series B
Stock purchased pursuant to the prior Investment Agreements and upon conversion
of the Series C Stock purchased pursuant to this Agreement.

        5.2     Financial Statements.  The Corporation shall prepare and
deliver to each Investor:

                (a)  Within ninety (90) days after the end of each fiscal year
of the Corporation, a consolidated balance sheet of the Corporation and its
subsidiaries, if any, as of the end of such fiscal year and the related
consolidated statements of income, stockholders' equity and changes in cash
flow for the fiscal year then ended, all prepared in accordance with generally
accepted accounting principles applied on a consistent basis,




                                      -21-
<PAGE>   22
as audited by the Corporation's independent certified public accountants which
shall be a Big Six accounting firm selected by the Board of Directors of the
Corporation.

                (b)  Within twenty (20) days after the end of each month in each
fiscal year, a consolidated balance sheet of the Corporation and its
subsidiaries, if any, and the related consolidated statements of income,
unaudited but prepared in accordance with generally accepted accounting
principles and certified by the President and the chief financial officer of the
Corporation, such consolidated balance sheet to be as of the end of such month
and such consolidated statements of income to be for such month and for the
period from the beginning of the fiscal year to the end of such month, in each
case with (i) comparative statements for the corresponding period or periods in
the prior fiscal year, (ii) a comparison of the actual results with the budget
and management's discussion of any material variances, and (iii) management's
discussion of significant business matters which occurred during such month.

                (c)  Within thirty (30) days after the end of each quarter of
the fiscal year, a report certified by the President of the Corporation
discussing in detail the status of the Corporation's product development and
sales efforts during the preceding quarter and a current review of the
performance of the Corporation's personnel and a recommendation for any
appropriate changes in the Corporation's personnel and a recommendation for any
appropriate changes in the Corporation's staffing.

                (d)  At least thirty (30) days prior to the commencement of each
fiscal year of the Corporation, the Corporation shall submit to the Board of
Directors and each Investor an operating plan and budget for such year which
shall include operating, market and competitive information as well as complete
financial statements (income
<PAGE>   23
statement, balance sheet, cash flow and cost and expense detail).  Any
modifications in such operating plan and budget shall be delivered to the
Investors as promptly as practicable after such changes have been approved by
the Board.

                (e)  Such other information relating to the financial condition,
business prospects or corporate affairs of the Corporation as any Investor may,
from time to time, reasonably request.

Prior to the termination of the covenants contained in Section 5 as a result of
a public offering which satisfies the criteria set forth in Section 6.4, the
covenants set forth in this Section 5.2 shall terminate as to any Investor or
any assignee of an Investor if such Investor, assignee or group of affiliated
assignees of an Investor fails to hold at least (20) percent of the shares of
Class A Common Stock held by such Investor and issuable upon conversion of
Preferred Stock held by such Investor following consummation of the Closing or,
if such Investor purchases Additional Shares, the purchase of Additional Shares
(as adjusted for stock splits, stock dividends and combinations of shares). For
purposes of the foregoing, no transferee of shares sold by an Investor in a
public offering (pursuant to Rule 144 or otherwise) shall be deemed to be an
assignee.

        5.3     Inspection.  The Corporation shall permit the members of the
Board of Directors who are affiliated with any Investor and any other individual
designated by any Investor who has executed a confidentiality agreement
reasonably required by the Corporation, upon reasonable notice and during normal
business hours, to visit and inspect the Corporation's properties, to examine
the Corporation's books of accounts and records, and to discuss the
Corporation's affairs, finances and accounts with its officers.
<PAGE>   24
        5.4     Creation of Indebtedness.  Except with the consent of the Board
of Directors, the Corporation will not create, incur, assume or otherwise
become liable in respect of or have outstanding, any indebtedness (other than
the liabilities existing on the date hereof and liabilities for trade accounts
payable arising in the ordinary course of business), contingent or otherwise,
in excess of $10,000.

        5.5     Prompt Payment of Taxes.  The Corporation shall promptly pay
and discharge, or cause to be paid and discharged, prior to the earliest date
on which any penalty or interest is incurred or begins to accrue, all lawful
taxes, assessments and governmental charges or levies imposed upon any of its
income, profits, property or business; provided, however, that any such tax,
assessment, charge or levy need not be paid if the validity thereof shall
currently be contested in good faith by appropriate proceedings and if the
Corporation shall have set aside on its books adequate reserves with respect
thereto; and provided, further, that the Corporation will pay all such taxes,
assessments, charges or levies forthwith upon the commencement of proceedings
to foreclose any lien which may have attached as security therefore or with
respect thereto.

        5.6     Conduct of Business: Compliance with Laws.  The Corporation
will keep in full force and effect its corporate existence and all rights,
permits, licenses, patents, copyrights, trademarks, trade names and franchises
now held by the Corporation that are necessary for the conduct of its business,
and will acquire and keep in full force and effect any additional rights,
permits, licenses, patents, copyrights, trademarks, trade names and franchises
as from time to time may be necessary or appropriate in connection with the
conduct of its business. The Corporation will comply with all applicable laws
and





                                      -24-
<PAGE>   25
regulations where failure to comply would have a material adverse effect on the
Corporation's business, condition (financial or otherwise) or assets.

        5.7     Accounts and Reports.  The Corporation will keep true records
and books of account in which full and correct entries will be made of all
dealings or transactions in relation to its business and affairs in accordance
with generally accepted accounting principles consistently applied throughout
the period involved. The Corporation shall take no action which would cause the
opinion from its independent public accountants in connection with financial
statements, to be qualified in any material respect.

        5.8     Conflicts.  The Corporation will not enter into any business
transaction or dealings with any one or more of its directors, officers,
employees or stockholders, or any entity with which any director, officer,
employee or stockholder is affiliated, either as director, officer, employee,
trustee, stockholder, beneficiary, partner, venturer or otherwise, involving
the payment or receipt of property or services of a value unless such
transaction or dealing is conducted on an arm's length basis and on terms no
less favorable to the Corporation from a person unrelated to the Corporation or
to any person affiliated therewith. Any such transaction or dealing which
presents a potential conflict of interest must be reviewed and approved in
advance by a majority of the Corporation's disinterested directors.

        5.9     Conveyance of Assets.  Unless the consent of the Board of
Directors is obtained, the Corporation shall not (i) convey, sell, license, or
lease, in a single or a series of related transactions, any asset or assets
purchased by the Corporation for more than $50,000, or, except in the ordinary
course of the Corporation's business, the rights to any intellectual property
rights developed or owned by or licensed to the Corporation; (ii)




                                      -25-
<PAGE>   26
acquire all or substantially all of the assets or capital stock of a third
party; (iii) sell, lease, transfer, license or assign any operating rights,
licenses or franchises; or (iv) abandon its current line of business or enter
into a line of business different from such current line of business.

        5.10    Intellectual and Business Property; Agreements.  The
Corporation will use its best efforts to maintain the confidentiality of any
proprietary information and intellectual property rights owned by, licensed to
or otherwise pertaining to the Corporation and will seek to restrict the
ability of any employee having knowledge of such proprietary information or
intellectual property rights from disclosing such information or competing with
the Corporation by having each such employee execute confidentiality and/or
employment agreements containing such restrictive covenants. The Corporation
shall require each of its officers, key employees, consultants and advisers to
execute a Non-Disclosure and Development Agreement and shall require each of
its key employees to enter into a Non-Competition Agreement containing only
such changes as may be approved by the Board of Directors. The registration
with the United States Government Patent and Trademark Office or Library of
Congress of its proprietary information and intellectual property rights by the
Corporation shall not be considered a violation by the Corporation of its
obligation to maintain confidential or proprietary information or trade secrets
of the Corporation. The Corporation, at its own expense, will take all actions
necessary and appropriate to obtain available patent protections for its
proprietary information and intellectual property rights in the United States
and any other country deemed necessary by the Board of Directors.





                                      -26-
<PAGE>   27
        5.11    Agreement.  The Corporation shall fulfill all of its
contractual obligations under this Agreement and the Investment Agreements as
amended hereunder. The Corporation shall not exercise any option provided
under this Agreement or the Investment Agreements except with the approval of
the Board of Directors.

        5.12    Reservation of Conversion Shares.  The Corporation shall at all
times reserve and keep available such number of its duly authorized shares of
Class A Common Stock as shall be sufficient to effect the conversion of all of
the Shares issued pursuant to this Agreement and all of the shares of Series A
Stock and Series B Stock issued pursuant to the Investment Agreements as are
then outstanding. If at any time the number of authorized but unissued shares
of Class A Common Stock shall not be sufficient to effect the issuances
referenced in this Section 5.12, the Corporation shall forthwith take such
corporate action as may be necessary to increase its authorized but unissued
shares of Class A Common stock to such number of shares as shall be sufficient
for such purposes. The Corporation shall obtain any authorization, consent,
approval or other action by, or make any filing with, any court or
administrative body that may be required under applicable federal or state
securities laws in connection with the issuance of any shares of Class A Common
Stock upon conversion of any Shares issued hereunder or of any shares of Series
A Stock or Series B Stock purchased pursuant to the Investment Agreements.
  
        5.13    Dilutive Issuances of Common Stock.  The Corporation shall not
take any action which would result in an adjustment of the Conversion Prices of
the Series A Stock, Series B Stock or Series C Stock pursuant to Article IV B.4
of the Certificate of Incorporation, except with the approval of the Board of 
Directors.


                                      -27-



<PAGE>   28
        5.14    Expenses.  Whether or not the transactions contemplated hereby
shall be consummated, the Corporation will pay the reasonable fees and the
expenses and disbursements of Special Counsel, which are incurred in connection
with the negotiation, preparation, execution and consummation of the
transactions contemplated under this Agreement and the preparation of the
documents to evidence such transaction, together with all amendments thereto
and consents and waivers thereunder.

        5.15    Notification.  The Corporation will promptly advise the
Investors in writing of the following:

                (a)  The filing of any suit, action, or other proceeding
against the Corporation or any investigation which the Corporation learns is
pending or threatened against it, if the amount involved or at risk by nature
of such suit, action, other proceeding or investigation exceeds Ten Thousand
Dollars ($10,000);

                (b)  The filing, recording or assessment of a federal, state or
local tax lien against the Corporation or any of its assets;

                (c)  Any default or breach in any license agreement to which
the Corporation is a party;

                (d)  Any other event which represents a material adverse change
in the business or condition, financial or otherwise, of the Corporation; and

                (e)  The occurrence of an event that constitutes a material
breach of this Agreement, the Investment Agreements, or the Collateral 
Agreements.

        5.16    Use of Proceeds.  The Corporation shall use the proceeds from
the sale of the shares for the filing of a New Drug Application (NDA),
development of other drugs, working capital and other business purposes.


                                      -28-
<PAGE>   29
        5.17    Board of Directors: Visitation Rights.  The Corporation shall
hold regular meetings of its Board of Directors at least every three months. The
Bylaws of the Corporation shall provide that, in addition to any provisions
required by law for the calling of special meetings of the Board of Directors, a
special meeting may be called at the request of either (i) any two directors or
(ii) the holders of twenty-five (25) percent of the aggregate number of
outstanding shares of Class A Common Stock which have been issued or are
issuable upon conversion of the Series A Stock, the Series B Stock and the
Series C Stock.  The Corporation shall reimburse each Director who is not any
employee of the Corporation for the out-of-pocket expenses incurred by such
Director in attending meetings of the Board of Directors and other meetings or
events as a representative of the Corporation or at the request of the
Corporation.  Each Investor which has purchased shares of Series A Stock, Series
B Stock and/or Series C Stock from the Corporation for an aggregate purchase
price of at least $500,000 shall have the right, at its own expense, to send one
representative to attend each meeting of the Board of Directors if it does not
otherwise have a representative who serves on the Board of Directors.  The
Corporation shall give each such Investor advance notice of each such meeting at
the same time and in the same manner as it gives notice to the Directors of the
Corporation.  The provisions of this Section 5.17 shall terminate upon the
effective date of a registration statement filed with the Securities and
Exchange Commission in connection with the public offering of securities of the
Corporation which satisfies the criteria set forth in Section 6.4.

        5.18    Committees of the Board.  The Board of Directors shall have at
least the following committees: Audit Committee, comprised of two non-employee
Directors, Clinical


                                      -29-
<PAGE>   30
Audit Committee comprised of two non-employee directors; and Compensation
Committee, comprised of three non-employee Directors.

        5.19    Key Person Insurance.  The Corporation shall use its best
efforts to promptly obtain and maintain an insurance policy on the life of Dr.
Brian Gallagher in the face amount of $1,000,000 (or such other amount as may
be determined by the Board of Directors from time to time as a result of an
annual review) payable to the Corporation as beneficiary.

        5.20    Reserved Employee Shares.  The Corporation shall reserve 250,000
(subject to adjustment for stock splits, combinations or recapitalization) of
its Class B Common Stock for issuance to its employees, non-employee directors,
advisers and consultants upon exercise of options or otherwise under such
arrangements, contracts or plans as are recommended by management and approved
by the Board of Directors.  Such reservation shall be in addition to the 600,000
shares of Class B Stock currently reserved for such purposes, including 161,000
shares reserved for issuance upon exercise of currently outstanding options.  In
addition, the Corporation shall reserve 50,000 (subject to adjustment for stock
splits, combinations or recapitalization) of its Class A Common Stock and 50,000
of its Series B Preferred Stock for issuance upon exercise of an option granted
to Brian Gallagher.  Without the unanimous consent of the Directors who are
affiliated with an Investor, the vesting of shares (or options therefor) issued
to an employee, other than shares issuable upon exercise of currently
outstanding options, shall not be at a rate in excess of 25 percent per annum
from the date of issuance of the shares or the options, as the case may be.
Holders of shares issued pursuant to such vesting arrangements shall be required
to execute stock restriction agreements setting forth the vesting arrangements.


                                      -30-
<PAGE>   31
                                   SECTION 6

                    RIGHT TO PARTICIPATE IN FUTURE FINANCING

        6.1     Right to Participate.  Except in the case of the issuance of
(i) shares of Class A Common Stock upon conversion of the Series A Stock, the
Series B Stock and the Class C Stock, (ii) any shares of Class B Common Stock
issuable under any incentive plan for the Corporation's employees approved by
the Board of Directors, (iii) the shares of Series A Stock, Series B Stock and
Series C Stock issued under the Investment Agreements and this Agreement, (iv)
the shares the Corporation is obligated to issue to The Research Foundation of
State University of New York, (v) the Additional Shares sold in accordance with
Section 1.4 hereof, (vi) shares which the Corporation may issue in connection
with the acquisition of stock or other property of another person, (viii) any
debt obligation issued to a bank lender, and (ix) shares offered to the public
pursuant to an underwritten public offering, the Corporation shall not issue,
sell or exchange, agree to issue, sell or exchange, or reserve or set aside for
issuance, sale or exchange, any debt obligation or security ("Debt Security")
or any shares of Class A or Class B Common Stock (which for purposes of this
Section 6 shall include any security which can be exercised for or converted
into shares of Class A or Class B Common Stock) or any other equity security
(collectively the "Offered Securities"), unless in each case the Corporation
shall have first offered to sell to each of the Investors its respective pro
rata share of such Debt Security or each class of Common Stock or other equity
security comprising the Offered Securities, at a price and on such other terms
as shall have been specified by the Corporation in writing delivered to the
Investors and shall be identical to the price and terms for the Offered
Securities to be offered to third parties (the "Offer"), which Offer by its
terms shall remain open and




                                      -31-
<PAGE>   32
irrevocable for a period of thirty (30) days from the date it is delivered by
the Corporation to the Investors.  If one of more Investors fail to notify the
Corporation that they desire to purchase their full pro rata shares, the
Corporation shall promptly notify the Investors which notified the Corporation
of their desire to purchase their full pro rata shares and each such Investor
shall have the right to purchase such unsubscribed shares subject in the event
of oversubscription to allocation based on the proportionate ownership of the
Class A Common Stock issued and issuable upon conversion of the Series A Stock,
Series B Stock and Series C Stock held by each such subscribing Investor.  Each
Investor which desires to purchase any of the unsubscribed shares must give the
Corporation written notice of the number of such shares it will purchase within
ten (10) days of the Corporation's notice to it of the number of unsubscribed
shares available for purchase.  If any Investor fails to purchase at least its
pro rata share of any Offered Securities, its right to participate in the
purchase of Offered Securities pursuant to this Section 6 shall terminate with
respect to any future offering of securities.

        6.2     Pro Rata Share.  For purposes hereof, an Investor's "pro rata
share" shall be equal to the total amount of the obligation represented by such
Debt Security or the total number of shares of Class A and Class B Common Stock
or other equity security constituting the Offered Securities multiplied by a
fraction, (i) the numerator of which is the number of issued shares of Class A
Common Stock then held by the Investor (including for the purpose of such
calculation the number of shares of Class A Common Stock issuable to the
Investor upon conversion of Series A Stock, Series B Stock and Series C Stock,
and (ii) the denominator of which is the number of shares of Class A Common
Stock then held by all Investors (including for the purpose of such calculation
the number of shares of Class




                                      -32-
<PAGE>   33
A Common Stock issuable upon conversion of the Series a Stock, Series B Stock
and Series C Stock (excluding for purposes of calculation of both the numerator
and the denominator shares of Class A Common Stock which may have been sold in a
public offering pursuant to Rule 144 or otherwise).  Such pro rata share shall
be determined as of the date notice is sent to Investors under Section 6.1
hereof.

        6.3     Notice.  Notice of an Investor's intention to accept, in whole
or in part, an Offer shall be evidenced by a writing signed by the Investor and
deliver to the Corporation prior to the end of the 30-day period of such Offer,
setting forth such portion of the Offered Securities as such Investor elects to
purchase.  Failure of an Investor to timely deliver such notice shall constitute
a waiver of such Investor's rights under this Section 6 with respect to the
Offered Securities referenced in such Offer.

        6.4     Termination Upon Public Offering.  Notwithstanding the foregoing
provisions of this Section 6, the rights of the Investors and the obligations of
the Corporation under this Section 6 shall terminate upon the effective date of
any registration statement filed with the Securities and Exchange Commission in
connection with any public offering of the Corporation's securities in which (i)
the per share price in the offering is at least $6.00 and (ii) the aggregate
amount of the offering is at least $12,000,000 (other than in connection with an
offering to employees of the Corporation pursuant to an employee benefit, bonus
or similar plan).
<PAGE>   34
                                   SECTION 7

                                 MISCELLANEOUS
                                 
        7.1     Survival of Warranties.  The warranties, representations and
covenants of the Corporation and the Investors contained in this Agreement will
survive the execution and delivery of this Agreement.

        7.2     Successors and Assigns.  Except as otherwise provided herein,
the terms and conditions of this Agreement will inure to the benefit of and be
binding upon the respective successors and assigns of the parties (including
transferees of any shares of Series C Stock sold hereunder or any Class A Common
Stock issued upon conversion thereof).  Nothing in this Agreement, express or
implied, is intended to confer upon any party other than the parties hereto or
their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.

        7.3     Governing Law.  This Agreement will be governed by and construed
in accordance with the laws of the State of Delaware.

        7.4     Counterparts.  This Agreement may be executed in two or more
counterparts, each of which will be deemed an original, but all of which
together will constitute one and the same instrument.

        7.5     Titles and Subtitles.  The titles and subtitles used in this
Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement.

        7.6     Notices.  Unless otherwise provided, notice required or
permitted to be given to a party pursuant to the provisions of this Agreement
will be in writing and will
<PAGE>   35
be effective and deemed given under this Agreement on the earliest of (i) the
date of personal delivery, or (ii) the date of delivery by facsimile, or (iii)
the business day after deposit with a nationally recognized courier or
overnight service, including Express Mail, for United States deliveries or
three (3) business days after such deposit for deliveries outside of the United
States. All notices not delivered personally or by facsimile will be sent with
postage and other charges prepaid and properly addressed to the party to be
notified at the address set forth below such party's signature on this
Agreement or at such other address as such party may designate by ten (10)
days' advance written notice to the other parties hereto. All notices for
delivery outside the United States will be sent by facsimile, or by nationally
recognized courier or overnight service, including Express Mail. Any notice
given hereunder to more than one person will be deemed to have been given, for
purposes of counting time periods hereunder, on the date given to the last
party required to be given such notice. Notices to the Corporation will be
marked to the attention of the President.

        7.7     Finders' Fees.  Each party represents that it is not obligated
to pay any finders' fee or commission in connection with this transaction. Each
Investor agrees to indemnify and to hold the Corporation harmless, and the
Corporation agrees to indemnify and to hold the Investors harmless, from any
liability for any commission or compensation in the nature of a finders' fee
(and the costs and expenses of defending against such liability or asserted
liability) for which the Investor or the Corporation, as the case may be, or
any of its officers, partners, employees or representatives is responsible.

        7.8     Entire Agreement; Amendments and Waivers.  This Agreement,
together with all Exhibits and Schedules hereto, each of which is incorporated
herein by reference, constitutes the entire agreement among the parties hereto
with respect to the





                                      -35-
<PAGE>   36
specific subject matter hereof, superseding in their entirety all other or
prior agreements between or among them with respect to such specific subject
matter, except, where applicable, Sections 1, 2, 3, 4, and 8 of the Investment
Agreements. Except to the extent provided below or in Section 5 of this
Agreement, Investors who hold at least sixty six and two-third (66-2/3) of the
total shares of Class A Common Stock which have been issued and are issuable
upon the conversion of the Series A Stock and Series B Stock purchased pursuant
to the Investment Agreements and upon conversion of the Series C Stock
purchased pursuant to this Agreement shall be entitled by written instrument to
amend, waive, discharge or terminate any term or condition of this Agreement.
Notwithstanding the foregoing, any amendment, waiver, discharge or termination
of Section 6 or this Section 7.8 of this Agreement and any other amendment,
waiver, discharge or termination which does not apply to all parties to this
Agreement equally or which increases the obligation of any party under this
Agreement shall require the consent of all of the parties to this Agreement.

        7.9     Severability.  If any provision of this Agreement is held to be
unenforceable under applicable law, such provision will be excluded from this
Agreement to the extent unenforceable and the balance of such provision, and of
this Agreement, will be interpreted as if such provision or part and hereof
were so excluded and will be enforceable in accordance with its terms.


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                                      -36-
<PAGE>   37
        IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date and year first above written.


COLLAGENEX, INC.                         COLUMBINE VENTURE FUND II, L.P.

By:  /s/ BRIAN GALLAGHER                 By:  Columbine Venture Management, II,
   -------------------------------            Its General Partner
    Brian Gallagher, President
    301 South State Street                    By: /s/ TERENCE E. WINTERS
    Newtown, PA 18940                            ----------------------------
                                                  Terence E. Winters
                                                  Title: General Partner
JOHNSON & JOHNSON                                 9449 N. 90th Street, Suite 200
DEVELOPMENT CORPORATION                           Scottsdale, AZ 85258

By:  /SIG/
   -------------------------------       UNCO VENTURES, LTD.
Title:
      ----------------------------       By:   /SIG/
      One Johnson & Johnson Plaza           ----------------------------------
      New Brunswick, NJ 08937            Title:  General Partner
      Attn: Susan Lambert                        520 Post Oak Boulevard, 
                                                 Suite 130
                                                 Houston, TX 77027

THE VENTURE FUND OF
WASHINGTON, L.P.                         MARQUETTE VENTURE
                                         PARTNERS II, L.P.
By:  American Venture Partners, L.P.,
     Its General Partner                 By:  Marquette General II,
                                              Its General Partner

     By: /s/ STEPHEN W. RITTERBUSH            By:  JED, Limited Partnership
        ----------------------------               or LDR, Limited
         Stephen W. Ritterbush                     Partnership
         Managing General Partner                  or JP, Limited Partnership,
         601 Thirteenth Street, N.W.               Its Partners
         Suite 710 North
         Washington, DC 20005                 By: /SIG/
                                                 ----------------------------
                                                  a General Partner of one of
                                                  the above

                                              By: /SIG/
                                                 ----------------------------
                                                  520 Lake Cook Road
                                                  Suite 450
                                                  Deerfield, IL 60015






































                                            

<PAGE>   1
                                                                     EXHIBIT 11

                        CollaGenex Pharmaceuticals, Inc.

                        (A Development Stage Enterprise)

Computation of Pro forma Net Loss per Share


   

<TABLE>
<CAPTION>

                                                        December 31,             March 31,
                                                           1995                    1996
                                                        ------------           ------------
<S>                                                     <C>                     <C> 

Net loss                                                $(5,268,562)            $(1,333,118)
                                                        ===========             ===========
Weighted average number of shares of common 
  stock outstanding during the periods after
  giving effect to the one-for-two reverse
  stock split                                               302,430                 313,508

Add shares of common stock options using the
  treasury stock method                                     165,195                  33,264

Conversion of Series C mandatorily redeemable
  convertible preferred stock using the treasury
  stock method                                            1,288,310                      --


Conversion of Series A, B and C mandatorily
  convertible preferred stock using the if-
  converted method                                        3,051,941               5,199,124
                                                        -----------             -----------

Average number of shares                                  4,807,876               5,545,896
                                                        ===========             ===========

Pro forma net loss per share                            $     (1.10)            $     (0.24)
                                                        ===========             ===========

</TABLE>
    

<PAGE>   1
 
                         INDEPENDENT AUDITORS' CONSENT
 
The Board of Directors
  CollaGenex Pharmaceuticals, Inc.:
 
     We consent to the use of our report included herein and to the reference to
our firm under the heading "Experts" in the prospectus.
 
                                   KPMG PEAT MARWICK LLP
 
Princeton, New Jersey
   
June 19, 1996
    

<PAGE>   1
 
                               CONSENT OF COUNSEL
 
     Hoffmann & Baron hereby consents to the reference to our firm under the
caption "Experts" in the Registration Statement on Form S-1 and related
Prospectus for the registration of shares of Common Stock of CollaGenex
Pharmaceuticals, Inc.
 
HOFFMANN & BARON
 
Jericho, NY
May 24, 1996

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-START>                             JAN-01-1995
<PERIOD-END>                               DEC-31-1995
<CASH>                                       5,806,435
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                             5,813,717
<PP&E>                                          14,748
<DEPRECIATION>                                   2,844
<TOTAL-ASSETS>                               5,839,985
<CURRENT-LIABILITIES>                          512,527
<BONDS>                                              0
                       18,908,106
                                          0
<COMMON>                                         3,127
<OTHER-SE>                                (13,583,775)
<TOTAL-LIABILITY-AND-EQUITY>                 5,839,985
<SALES>                                              0
<TOTAL-REVENUES>                                     0
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                             5,183,371
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             144,108
<INCOME-PRETAX>                            (5,268,562)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (5,268,562)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (5,268,562)
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                   (1.10)
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               MAR-31-1996
<CASH>                                       4,967,629
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                             5,024,291
<PP&E>                                          35,911
<DEPRECIATION>                                     654
<TOTAL-ASSETS>                               5,077,440
<CURRENT-LIABILITIES>                        1,002,437
<BONDS>                                              0
                       19,291,303
                                          0
<COMMON>                                         3,152
<OTHER-SE>                                (15,219,452)
<TOTAL-LIABILITY-AND-EQUITY>                 5,077,440
<SALES>                                              0
<TOTAL-REVENUES>                                     0
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                             1,393,975
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                            (1,333,118)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (1,333,118)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (1,333,118)
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                   (0.24)
        

</TABLE>


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