KOS PHARMACEUTICALS INC
424B4, 1997-03-07
PHARMACEUTICAL PREPARATIONS
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                               4,150,000 Shares 

                          KOS PHARMACEUTICALS, INC. 

                                 Common Stock 
- -----------------------------------------------------------------------------

   All of the shares of Common Stock, par value $.01 per share (the "Common 
Stock"), offered are being sold by Kos Pharmaceuticals, Inc. ("Kos" or the 
"Company"). 

   Prior to this offering, there has been no public market for the Common Stock
of the Company. See "Underwriting" for a discussion of the factors that were
considered in determining the initial public offering price. The Common Stock
has been approved for quotation on the Nasdaq National Market under the symbol
"KOSP".

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

          THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF 
       RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 6 OF THIS PROSPECTUS. 
- -----------------------------------------------------------------------------
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>
<S>              <C>            <C>                   <C>
                                      Underwriting 
                     Price to         Discounts and      Proceeds to 
                     Public           Commissions(1)     Company(2)
- ----------------------------------------------------------------------------- 
Per Share            $     15.00        $      1.05        $     13.95
Total(3)             $62,250,000        $ 4,357,500        $57,892,500
</TABLE>

(1) The Company has agreed to indemnify the Underwriters against certain 
    liabilities, including liabilities under the Securities Act of 1933, as 
    amended. See "Underwriting." 

(2) Before deducting expenses payable by the Company, estimated to be 
    $600,000. 

(3) The Company has granted the Underwriters an option, exercisable within 30 
    days of the date hereof, to purchase an aggregate of up to 622,500
    additional shares at the Price to Public, less Underwriting Discounts and 
    Commissions to cover over-allotments, if any. If all such additional 
    shares are purchased, the total Price to Public, Underwriting Discounts 
    and Commissions, and Proceeds to Company will be $71,587,500, $5,011,125, 
    and $66,576,375 respectively. See "Underwriting." 
    -------------------------------------------------------------------------

   The Common Stock is offered by the several Underwriters named herein when, 
as and if received and accepted by them, and subject to their right to reject 
orders in whole or in part and subject to certain other conditions. It is 
expected that delivery of certificates for the shares will be made at the 
offices of Cowen & Company, New York, New York on or about March 12, 1997. 
- -----------------------------------------------------------------------------

COWEN & COMPANY 
                           DILLON, READ & CO. INC. 
                                                          SALOMON BROTHERS INC 

March 7, 1997 
<PAGE>

                            AVAILABLE INFORMATION 

   The Company has filed with the Securities and Exchange Commission (the 
"Commission") a Registration Statement on Form S-1 (the "Registration 
Statement") under the Securities Act, with respect to the securities offered 
hereby. This Prospectus, which constitutes part of the Registration 
Statement, does not contain all the information set forth in the Registration 
Statement, certain portions of which have been omitted in accordance with the 
rules and regulations of the Commission. For further information with respect 
to the Company and the securities offered hereby, reference is made to the 
Registration Statement and to the exhibits and schedules thereto. Statements 
made in this Prospectus as to the contents of any contract, agreement or 
other document referred to are not necessarily complete. With respect to each 
such contract, agreement or other document filed as an exhibit to the 
Registration Statement, reference is made to the exhibit for a more complete 
description of the matter involved, and each such statement is qualified in 
its entirety by such reference. The Registration Statement, including the 
exhibits and schedules thereto, may be inspected without charge at the public 
reference facilities maintained by the Commission at Judiciary Plaza, Room 
1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the regional 
offices of the Commission located at 7 World Trade Center, Suite 1300, New 
York, New York 10048 and the Citicorp Center, 500 West Madison Street, Suite 
1400, Chicago, Illinois 60661. Copies of such material may also be obtained 
from the Public Reference Section of the Commission located at Judiciary 
Plaza, Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, upon 
payment of prescribed fees. The Commission maintains a Web site that contains 
reports, proxy and information statements and other information regarding 
registrants that file electronically with the Commission with a Web site 
address of http://www.sec.gov. 

   The Company intends to furnish its shareholders with annual reports 
containing financial statements audited by the Company's independent 
accountants and to make available to its shareholders quarterly reports for 
the first three quarters of each fiscal year containing unaudited interim 
financial information. 
- -----------------------------------------------------------------------------

   NIASPAN/registered trademark/ is a registered trademark of the Company. 
- -----------------------------------------------------------------------------


   CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK.
SPECIFICALLY, THE UNDERWRITERS MAY OVERALLOT IN CONNECTION WITH THE OFFERING,
AND MAY BID FOR, AND PURCHASE, SHARES OF THE COMMON STOCK IN THE OPEN MARKET.
FOR A DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."


                                2           
<PAGE>
                              PROSPECTUS SUMMARY 

   THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY THE MORE DETAILED 
INFORMATION AND CONSOLIDATED FINANCIAL STATEMENTS APPEARING ELSEWHERE IN THIS 
PROSPECTUS, INCLUDING "RISK FACTORS" HEREIN. EXCEPT AS OTHERWISE NOTED, ALL 
INFORMATION IN THIS PROSPECTUS ASSUMES NO EXERCISE OF THE UNDERWRITERS' 
OVER-ALLOTMENT OPTION. 

                                 THE COMPANY 

   Kos Pharmaceuticals, Inc. ("Kos", pronounced Kos, or the "Company") is 
engaged primarily in the development of proprietary prescription 
pharmaceutical products for the treatment of certain chronic cardiovascular 
and respiratory diseases. The Company intends to manufacture its products and 
to market such products directly through its own specialty sales force. The 
Company's cardiovascular products under development consist of 
controlled-release, once-a-day, oral dosage formulations. The Company's 
respiratory products under development consist of aerosolized inhalation 
formulations to be used primarily with the Company's proprietary inhalation 
devices. 

   The Company was founded in 1988 by the former Chief Executive Officer, 
Chief Operating Officer, and Director of Product Development of Key 
Pharmaceuticals, Inc., which was acquired by Schering-Plough Corporation in 
June 1986. The Company believes that substantial market opportunities exist 
for developing drugs that are reformulations of existing approved 
prescription pharmaceutical products but which offer certain safety 
advantages, such as reduced harmful side effects, or patient compliance 
advantages, such as once-a-day rather than multiple daily dosing regimens, 
over such currently existing products. Kos believes that developing 
proprietary products based on currently approved drugs, rather than new 
chemical entities, may reduce regulatory and development risks and, in 
addition, facilitate the marketing of such products because physicians are 
generally familiar with the safety and efficacy of such products. Seven of 
the Company's nine products under development require new drug application 
("NDA") filings with the United States Food and Drug Administration ("FDA"). 
Although more expensive and time consuming, developing products that require 
NDA approval offers several advantages compared with generic products, 
including potential for higher gross margins, limited competition resulting 
from significant clinical and formulation development challenges, and a 
three-year statutory barrier to generic competition. 

   The Company's objective is to become a fully-integrated specialty 
pharmaceutical company that develops, manufactures, and markets its 
proprietary products. The Company's management has significant experience in 
implementing the principal elements of the Company's business strategy. These 
elements consist of the following: (i) select products with unrealized 
commercial potential where safety or patient compliance may be improved; (ii) 
focus initially on the large, rapidly growing cardiovascular and respiratory 
markets, which include many chronic diseases requiring long-term therapy; 
(iii) develop proprietary formulations of currently approved pharmaceutical 
compounds, which can reduce regulatory and development risks typically 
associated with the development of new chemical entities; (iv) manage 
internally the clinical development of its products; (v) manufacture its 
products internally; (vi) market its products directly through the Company's 
specialty sales force; and (vii) leverage its core competencies through 
additional corporate and academic alliances. 

   On May 6, 1996, Kos submitted a NDA to the FDA for NIASPAN, its lead 
product under development. NIASPAN is a once-a-day, oral, controlled-release 
formulation of niacin for the treatment of multiple lipid disorders, which 
are primary risk factors for coronary heart disease. Niacin is a water 
soluble vitamin long recognized by the National Institutes of Health and the 
American Heart Association as an effective pharmacological agent for the 
treatment of multiple lipid disorders, including elevated low-density 
lipoprotein ("LDL") cholesterol, total cholesterol, and triglycerides and low 
high-density lipoprotein ("HDL") cholesterol. The Company submitted its NDA 
based on six clinical trials, including three double-blinded, 
placebo-controlled pivotal clinical trials, involving an aggregate of 633 
NIASPAN-treated subjects at 17 sites throughout the United States. The 
results of these 

                                3           
<PAGE>
trials produced statistically significant changes in all major lipid 
components without serious treatment-related adverse events. Treatment with 
NIASPAN demonstrated a 14% to 19% reduction in LDL cholesterol, a 25% to 35% 
reduction in triglycerides, an increase of 22% to 29% in HDL cholesterol, and 
a reduction of 24% to 29% in Lp(a). Moreover, NIASPAN'S controlled-release 
formulation and dosing regimen reduced the liver toxicity and intolerable 
side effects generally associated with currently available formulations of 
niacin. There can be no assurance that the FDA will approve the Company's NDA 
for NIASPAN on a timely basis, or at all. 

   The Company expects to launch NIASPAN in 1997, and Kos is establishing a 
specialty sales force to market NIASPAN to the approximately 16,000 
physicians who account for approximately 40% of the total prescriptions for 
lipid-altering medications in the United States. The Company's marketing of 
NIASPAN will focus on niacin's long-recognized position as first-line drug 
therapy for the treatment of hyperlipidemia and on informing specialist 
physicians as to the manner in which NIASPAN achieves its safety and efficacy 
profile. In 1995, the market for cholesterol reducing drugs exceeded $2.0 
billion in the United States and was one of the fastest growing sectors of 
the cardiovascular market. 

   In addition to NIASPAN, Kos has three other once-a-day, controlled-release 
cardiovascular products under development: (i) a combination of two currently 
approved drugs for the treatment of multiple lipid disorders; (ii) a 
formulation of captopril, an angiotensin converting enzyme ("ACE") inhibitor 
for hypertension; and (iii) a branded generic form of 
isosorbide-5-mononitrate, a nitrate for angina. In 1995, the disease segments 
of the cardiovascular market for which the Company is developing its products 
achieved aggregate sales in the United States of approximately $10.2 billion. 

   Kos is also developing five aerosolized inhalation pharmaceutical 
products, dispensed in metered-dose inhalation ("MDI") devices for the 
treatment of asthma. The Company is developing a generic version of 
albuterol, a beta-agonist for asthma, dispensed in a generic MDI with a 
chloroflourocarbon ("CFC") propellant. Kos anticipates that it will submit an 
abbreviated new drug application ("ANDA") for its CFC albuterol in 1997. Kos 
is also developing three non-CFC formulations using its proprietary breath 
coordinated inhaler: two different inhaled steroids for asthma, triamcinolone 
and flunisolide, and albuterol. In addition, the Company is developing a 
proprietary breath actuated inhaler for pediatric and geriatric use with one 
of its non-CFC formulations. The market for asthma products in 1995 was $2.4 
billion in the United States. 

   In 1996, the Company entered into certain agreements with Fuisz 
Technologies, Ltd., for the development of up to six products using Fuisz' 
proprietary microsphere formulation technology. Fuisz has commenced the 
development of three of these products, including the Company's combination 
product for treatment of multiple lipid disorders, captopril and 
isosorbide-5-mononitrate; up to three other products will commence 
development during 1997. The Company is also presently sponsoring basic 
research at Tufts University and Boston University and intends to enter into 
corporate alliances to develop products identified through these research 
programs. 

   Since its inception, the Company's operations have been funded entirely by 
Michael Jaharis, one of the Company's founders and its Chairman who was 
previously the Chief Executive Officer of Key Pharmaceuticals, Inc. The 
Company employs approximately 105 people, of whom 68 are in product 
development and 19 in manufacturing. 

   The Company was incorporated in Florida on June 25, 1996, as the successor 
to Kos Holdings, Inc. (formerly named Kos Pharmaceuticals, Inc.), which was 
incorporated in Florida on July 1, 1988. References in this Prospectus to the 
Company include the operations of its predecessor until June 30, 1996 and its 
wholly-owned subsidiary, Aeropharm Technology, Inc. 

                                4           
<PAGE>
<TABLE>
<CAPTION>
                                 THE OFFERING 
<S>                                      <C>

Common Stock offered hereby  ........... 4,150,000 shares 
Common Stock to be outstanding 
  after this offering .................. 14,150,000 shares(1) 
Use of proceeds ........................ For research and development, establishment
                                         of a sales and marketing organization for
                                         the anticipated commercial launch of NIASPAN,
                                         repayment of all or a portion of a loan from
                                         Kos Investments, Inc., working capital, and
                                         other general corporate purposes. 
Nasdaq National Market symbol .......... KOSP 
</TABLE>

<TABLE>
<CAPTION>
                     SUMMARY CONSOLIDATED FINANCIAL DATA 
                      (IN THOUSANDS, EXCEPT SHARE DATA) 

                                                                                                          SIX MONTHS ENDED 
                                                                       YEAR ENDED JUNE 30,                  DECEMBER 31, 
                                                           -------------------------------------------   --------------------- 
                                                                1994           1995           1996        1995        1996 
                                                           ------------- -------------  -------------    --------------------- 
                                                                                                            (UNAUDITED) 
<S>                                                        <C>           <C>           <C>              <C>         <C>
STATEMENT OF OPERATIONS: 
Revenues ................................................  $         22  $        14   $       --       $       --  $       --
Operating expenses: 
 Research and development ...............................         6,663        8,387       13,816            6,426       6,057 
 General and administrative .............................         1,619        1,614        1,772              789       1,936 
 Expense recognized on modification of stock
  option grants(2).......................................            --           --        5,436               --          --
                                                           ------------- -----------   ----------       ----------  ----------
Total operating expenses ................................         8,282       10,001       21,024            7,215       7,993 
Other income ............................................            (2)          --           - -              --          --
Interest (income) expense, net ..........................         1,108        1,052          (14)              (8)        131 
Minority interest (3) ...................................          (164)           1           16                1          --
                                                           ------------- ------------  ----------       ----------  ----------
Net loss ................................................   $    (9,530) $   (11,038)  $  (20,994)      $   (7,206) $   (8,124) 
                                                           ============= ============= ==========       ==========  ========== 
Net loss per share (4) ..................................   $     (0.84) $     (0.97)  $    (1.85)      $    (0.64) $    (0.72) 
                                                           ============= ============  ==========       ==========  ==========
Weighted average common shares in computing net loss
 per share(4) ...........................................    11,340,000   11,340,000   11,340,000       11,340,000  11,340,000 
</TABLE>


<TABLE>
<CAPTION>
                                                             DECEMBER 31, 1996 
                                                          ACTUAL     AS ADJUSTED(6) 
                                                       ----------- ---------------
                                                                (UNAUDITED) 
<S>                                                    <C>          <C>
BALANCE SHEET(5): 
Cash and cash equivalents ...........................    $    358       $ 49,296 
Working capital (deficit) ...........................      (8,816)        48,477
Total assets ........................................       3,197         52,135 
Total debt ..........................................       8,355             --
Deficit accumulated during the development stage(7)       (64,782)       (64,782) 
Shareholders' equity (deficit) ......................      (6,210)        51,083
</TABLE>

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

(1) Excludes 3,675,000 shares of Common Stock reserved for issuance under the 
    Company's 1996 Stock Option Plan and 325,000 shares of Common Stock 
    reserved for issuance upon exercise of other outstanding options. Options 
    to acquire an aggregate of 2,330,500 shares of Common Stock at a weighted 
    average exercise price of $4.44 per share were issued and outstanding as 
    of February 7, 1997. Excludes 893,000 shares of Common Stock issuable to Kos
    Investments, at March 7, 1997, upon the conversion, if any, of a note 
    representing a loan made to the Company by Kos Investments (the 
    "Convertible Note"). See "Management--Stock Option Plan" and "Certain 
    Transactions." 

(2) Reflects a non-cash charge associated with an extension of the exercise 
    period for stock options granted during 1988 to 1990 to the Company's 
    Chief Executive Officer and two independent consultants; no other 
    material economic terms of these options were changed. 

(3) Represents the minority shareholder's interest in Aeropharm Technology, 
    Inc., the Company's aerosol subsidiary, which interest was acquired by 
    the Company in June 1996. 

(4) See Note 2 of Notes to Consolidated Financial Statements for information 
    concerning the computation of net loss per share. Assuming the issuance 
    only of sufficient shares to repay indebtedness outstanding as of 
    December 31, 1996, supplementary pro forma net loss per share of common 
    stock would be $(0.67) for the six month period ended December 31, 1996. 

(5) The Company has funded its operations since July 1, 1996 using the 
    proceeds of a loan from Kos Investments, Inc., a company that is 
    wholly-owned by, and serves as an investment vehicle for Michael Jaharis, 
    the Company's Chairman and one of its founders. As of March 7, 1997, 
    the Company had outstanding borrowings of $13,395,000 under such loan. 
    See "Use of Proceeds." 

(6) Adjusted to reflect the sale of 4,150,000 shares of Common Stock offered 
    hereby and receipt by the Company of the estimated net proceeds therefrom. 
    See "Use of Proceeds" and "Capitalization." 

(7) In connection with the transfer on June 30, 1996 of assets and 
    liabilities from Kos Holdings, Inc. to the Company, net operating loss 
    carry forwards amounting to approximately $51.0 million and related tax 
    benefits, were not transferred to the Company. See "The Company" and 
    "Management's Discussion and Analysis of Financial Condition and Results 
    of Operations." 

                                5           
<PAGE>
                                 RISK FACTORS 

   IN ADDITION TO THE OTHER INFORMATION IN THIS PROSPECTUS, PROSPECTIVE 
INVESTORS SHOULD CONSIDER THE FOLLOWING FACTORS IN EVALUATING THE COMPANY AND 
ITS BUSINESS BEFORE PURCHASING ANY OF THE COMMON STOCK OFFERED HEREBY. 
PROSPECTIVE INVESTORS ARE CAUTIONED THAT THE STATEMENTS IN THIS PROSPECTUS 
THAT ARE NOT DESCRIPTIONS OF HISTORICAL FACTS MAY BE FORWARD-LOOKING 
STATEMENTS THAT ARE SUBJECT TO RISKS AND UNCERTAINTIES. ACTUAL RESULTS COULD 
DIFFER MATERIALLY FROM THOSE CURRENTLY ANTICIPATED DUE TO A NUMBER OF 
FACTORS, INCLUDING THOSE IDENTIFIED UNDER "RISK FACTORS," "MANAGEMENT'S 
DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS," 
"BUSINESS" AND ELSEWHERE IN THIS PROSPECTUS. 

   The Company's success depends to a significant extent on whether its lead 
product, NIASPAN, is successfully commercialized. There can be no assurance 
as to the successful commercialization of NIASPAN. The successful 
commercialization of NIASPAN may be affected by various factors, certain of 
which are set forth below. 

EARLY STAGE OF DEVELOPMENT; HISTORY OF OPERATING LOSSES; UNCERTAINTY OF 
FUTURE PROFITABILITY 

   The Company is a development stage company. It has generated no revenues 
from product sales and it does not expect to generate significant revenue 
from product sales for at least the next nine months. As of December 31, 
1996, the Company's accumulated deficit was $64.8 million. In connection with 
the transfer of operations from Kos Holdings, Inc. to the Company on June 30, 
1996, net operating loss carry forwards amounting to approximately $51.0 
million and related tax benefits remained with Kos Holdings, Inc. and were 
not transferred to the Company. Consequently, the Company had no tax assets 
or liabilities as of June 30, 1996. See "The Company." To date the Company 
has dedicated most of its financial resources to the development of NIASPAN, 
the development of other products and general and administrative expenses. 
The Company expects to incur significant operating losses for at least the 
next 12 months, primarily due to the expansion of its research and 
development programs and the establishment of a sales and marketing 
organization. The Company's ability to achieve profitability will depend, 
among other things, on its successfully completing development of its 
products, obtaining regulatory approvals, establishing manufacturing, sales 
and marketing capabilities, achieving market acceptance for its products and 
maintaining sufficient funds to finance its activities. There can be no 
assurance that the Company will be able to achieve profitability or that 
profitability, if achieved, can be sustained. See "Selected Consolidated 
Financial Data," "Management's Discussion and Analysis of Financial Condition 
and Results of Operations," and "Business." 

UNCERTAINTIES RELATED TO FDA APPROVAL OF NIASPAN 

   On May 6, 1996, the Company submitted a NDA to the FDA for NIASPAN. The 
NDA requests authorization for the Company to market NIASPAN for the 
treatment of multiple lipid disorders. The FDA generally requires that the 
safety and efficacy of a drug be supported by results from adequate and 
well-controlled clinical trials before approval for commercial sale. If the 
FDA believes that the results of the pivotal clinical trials for NIASPAN do 
not establish the safety and efficacy of NIASPAN in the treatment of any or 
all of the referenced indications, or if the FDA fails to accept that the 
long-term patient benefits from the treatment of such indications has been 
established, the Company will not receive the approvals necessary to market 
NIASPAN. Failure to obtain FDA approval to market NIASPAN would have a 
material adverse effect on the Company. Securing approval for less than all 
of the indications set forth in the NIASPAN NDA could have a material adverse 
effect on the Company. The Company may be required to conduct additional 
clinical trials in order to demonstrate the safety and efficacy of NIASPAN, 
which trials also may not be acceptable to the FDA. Even if acceptable to the 
FDA, such additional trials may delay the FDA approval process, which could 
have a material adverse effect on the Company. There can be no assurance that 
the results of any of the Company's pivotal clinical trials will be 
satisfactory or that NIASPAN will obtain regulatory approval for 
commercialization on a timely basis, or at all, with respect to all or any of 
the indications for which the Company intends to market NIASPAN. 

                                6           
<PAGE>
UNCERTAINTIES RELATED TO PRODUCT DEVELOPMENT 

   The Company has not yet completed the development of any products and, 
accordingly, has not begun to market or generate revenues from the 
commercialization of products. Although the Company recently submitted a NDA 
to the FDA for NIASPAN, each of its other products under development is at an 
earlier stage of development. There can be no assurance that the Company will 
be able to successfully formulate any of its products as planned, or that the 
Company will be successful in demonstrating the safety and efficacy of such 
products in human clinical trials. These trials may be costly and 
time-consuming. The administration of any product the Company develops may 
produce undesirable side effects that could result in the interruption, delay 
or suspension of clinical trials, or the failure to obtain FDA or other 
regulatory approval for any or all targeted indications. Even if regulatory 
approval is secured, the Company's products under development may later 
produce adverse effects that limit or prevent their widespread use or that 
necessitate their withdrawal from the market. 

UNCERTAINTIES RELATED TO MARKET ACCEPTANCE 

   If the Company receives the required regulatory approvals to market 
NIASPAN, the Company's ability to successfully commercialize NIASPAN will 
depend in part on the acceptance of NIASPAN by physicians and their patients. 
The Company believes that intolerable flushing is one of the principal 
reasons why physicians generally have been reluctant to prescribe or 
recommend currently available formulations of niacin. Flushing episodes are 
often characterized by facial redness, tingling or rash. Although most 
patients taking NIASPAN will sometimes flush, the formulation and dosing 
regimen for NIASPAN have been designed to maximize patient acceptance and 
minimize the occurrence of flushing. There can be no assurance, however, that 
patients using NIASPAN will not suffer episodes of flushing that they 
consider intolerable. The failure of physicians to prescribe NIASPAN or the 
failure of patients to continue taking NIASPAN due to intolerable flushing or 
other side effects would have a material adverse effect on the Company. The 
Company believes that physicians have also been reluctant to prescribe or 
recommend certain currently available formulations of niacin because of 
potential liver toxicity associated with these formulations. Although 
clinical trials conducted using NIASPAN demonstrated that fewer than 1% of 
patients experienced clinically significant elevations in liver enzyme 
levels, there can be no assurance that patients using NIASPAN will not 
experience any clinically significant elevations of liver enzymes or other 
side effects. 

   Unanticipated side effects or unfavorable publicity concerning any of the 
Company's products under development or any other product incorporating 
technology similar to that used in the Company's products under development 
could have an adverse effect on the Company's ability to obtain regulatory 
approvals; to achieve acceptance by prescribing physicians, managed care 
providers or patients; and to commercialize its products, any of which could 
have a material adverse effect on the Company. 

PATENTS AND TRADEMARKS; INTERFERENCE 

   The Company's ability to commercialize any of its products under 
development will depend, in part, on its or its licensors' ability to obtain 
patents, enforce those patents, preserve trade secrets, and operate without 
infringing on the proprietary rights of third parties. In addition, the 
patents for which the Company has applied relating to NIASPAN and certain 
other of the Company's products under development are based on, among other 
things, the timed administration of NIASPAN. If the indications treated by 
NIASPAN and such other products under development could be treated using 
drugs without such timed administration, the Company's patents, if issued, 
would not prevent the use of such drugs for the treatment of such 
indications, which would have a material adverse effect on the Company. There 
can be no assurance that the patent applications licensed to or owned by the 
Company will result in issued patents, that patent protection will be secured 
for any particular technology, that any patents that have been or may be 
issued to the Company or its licensors will be valid or enforceable or that 
any patents will provide meaningful protection to the Company. 

   In general, the U.S. patents and patent applications owned by or licensed 
to the Company are method-of-use patents that cover the timed use of certain 
compounds to treat specified conditions. 

                                7           
<PAGE>
Composition-of-matter protection is not available for the active ingredient 
in NIASPAN. The active ingredient in NIASPAN, niacin, is currently sold in 
the United States and other markets for LDL cholesterol lowering and for 
other uses. Even in jurisdictions where the use of the active ingredient in 
NIASPAN for lowering LDL cholesterol and other indications may be covered by 
the claims of a use patent licensed to the Company, off-label sales might 
occur, especially if another company markets the active ingredient at a price 
that is less than the price of NIASPAN, thereby potentially reducing the 
sales of NIASPAN. See "Business--Competition" and "Business--Government 
Regulation." 

   The Company has a patent application pending in the U.S. Patent and 
Trademark Office ("PTO") with claims covering NIASPAN's method of use 
consistent with its recommended once-a-day dosing regimen. Certain of these 
claims have recently been held allowable by the PTO, but have not yet been 
issued as a patent. The patent examiner has, however, suspended prosecution 
of the Kos application and referred such application to the PTO's Board of 
Appeals to determine whether an interference should be declared between such 
Kos application and a method-of-use patent issued to a generic manufacturer 
allegedly claiming the same dosing regimen invention. It may take up to a 
year or more for the PTO's Board of Appeals to determine whether to declare 
such an interference. On February 7, 1997, the Company and such generic 
manufacturer entered into a cross licensing agreement (the "License 
Agreement") pursuant to which the parties agreed to resolve, as between 
themselves, the effects of such potential interference by granting licenses 
under their respective patent application and patent. 

   The patent positions of pharmaceutical and biotechnology companies are 
highly uncertain and involve complex legal and factual questions. There can 
be no assurance that the patents owned and licensed by the Company, or any 
future patents, will prevent other companies from developing similar or 
therapeutically equivalent products or that others will not be issued patents 
that may prevent the sale of Company products or require licensing and the 
payment of significant fees or royalties by the Company. Furthermore, there 
can be no assurance that any of the Company's future products or methods will 
be patentable, that such products or methods will not infringe upon the 
patents of third parties, or that the Company's patents or future patents 
will give the Company an exclusive position in the subject matter claimed by 
those patents. The Company may be unable to avoid infringement of third party 
patents and may have to obtain a license, defend an infringement action, or 
challenge the validity of the patents in court. There can be no assurance 
that a license will be available to the Company, if at all, on terms and 
conditions acceptable to the Company, or that the Company will prevail in any 
patent litigation. Patent litigation is costly and time consuming, and there 
can be no assurance that the Company will have or will devote sufficient 
resources to pursue such litigation. If the Company does not obtain a license 
under such patents, is found liable for infringement or is not able to have 
such patents declared invalid, the Company may be liable for significant 
money damages, may encounter significant delays in bringing products to 
market, or may be precluded from participating in the manufacture, use, or 
sale of products or methods of treatment requiring such licenses. 

   The Company also relies on trade secrets and other unpatented proprietary 
information in its product development activities. To the extent that the 
Company relies on trade secrets and unpatented know-how to maintain its 
competitive technological position, there can be no assurance that others may 
not independently develop the same or similar technologies. The Company seeks 
to protect trade secrets and proprietary knowledge in part through 
confidentiality agreements with its employees, consultants, advisors and 
collaborators. Nevertheless, these agreements may not effectively prevent 
disclosure of the Company's confidential information and may not provide the 
Company with an adequate remedy in the event of unauthorized disclosure of 
such information. If the Company's employees, scientific consultants or 
collaborators develop inventions or processes independently that may be 
applicable to the Company's products under development, disputes may arise 
about ownership of proprietary rights to those inventions and processes. Such 
inventions and processes will not necessarily become the Company's property, 
but may remain the property of those persons or their employers. Protracted 
and costly litigation could be necessary to enforce and determine the scope 
of the Company's proprietary rights. Failure to obtain or maintain patent and 
trade secret protection, for any reason, would have a material adverse effect 
on the Company. See "Business--Patents and Proprietary Rights." 

                                8           
<PAGE>
   The Company engages in collaborations, sponsored research agreements, and 
other arrangements with academic researchers and institutions that have 
received and may receive funding from U.S. government agencies. As a result 
of these arrangements, the U.S. government or certain third parties may have 
rights in certain inventions developed during the course of the performance 
of such collaborations and agreements as required by law or such agreements. 
Several legislative bills affecting patent rights have been introduced in the 
United States Congress. These bills address various aspects of patent law, 
including publication, patent term, re-examination subject matter and 
enforceability. It is not certain whether any of these bills will be enacted 
into law or what form such new laws may take. Accordingly, the effect of such 
potential legislative changes on the Company's intellectual property estate 
is uncertain. 

LIMITED SALES AND MARKETING EXPERIENCE 

   The Company has not yet established a sales and marketing organization nor 
has it yet marketed, distributed or sold any product. The Company intends to 
market NIASPAN and the majority of its other products under development 
through its own specialty sales force. Substantial resources will be required 
for the Company to establish its own sales force and promote the sale of 
NIASPAN and its other products under development. There can be no assurance 
that the Company will be able to establish a sales and marketing organization 
prior to the Company's planned launch of NIASPAN in 1997 or at all, or that 
the Company will devote resources to NIASPAN or its other products under 
development sufficient to achieve market acceptance. The Company's failure or 
delay in establishing a marketing and sales force prior to the planned launch 
of NIASPAN in 1997 or its failure to expend the resources to adequately 
promote NIASPAN would have a material adverse effect on the Company. The 
Company's failure to establish a marketing and sales force or its failure to 
expend the resources to adequately promote any of its other products under 
development could have a material adverse effect on the Company. 

COMPETITION AND TECHNOLOGICAL CHANGE 

   The active ingredient in NIASPAN, niacin, is available in several other 
formulations, most of which do not require a prescription. Although the 
Company believes that there are no currently available niacin formulations 
that have been approved by the FDA specifically for once-a-day dosing, there 
can be no assurance that physicians will not prescribe or recommend some of 
these unapproved niacin formulations, using the NIASPAN dosing regimen, to 
try to achieve the same results as NIASPAN. Substitution of other niacin 
formulations for NIASPAN could have a material adverse effect on the Company. 
Moreover, manufacturers of other niacin formulations could promote their 
products using the NIASPAN dosing regimen and could promote the sale of their 
products to treat the indications for which the Company has sought approval 
to market NIASPAN. Although such promotion would be a violation of FDA 
regulations, the occurrence of such practices would have a material adverse 
effect on the Company. See "Business--Government Regulation" and 
"Business--Competition." Moreover, many products are commercially available 
for the treatment of elevated LDL cholesterol, and the manufacturers of such 
products have significantly greater financial resources and sales and 
manufacturing capabilities than the Company. There can be no assurance that 
any products developed by the Company will be able to compete successfully 
with any of those products. 

   Many established pharmaceutical and biotechnology companies, universities, 
and other research institutions with resources significantly greater than the 
Company's may develop products that directly compete with the Company's 
products. Even if the Company's products under development prove to be more 
effective than those developed by other entities, such other entities may be 
more successful in marketing their products than the Company because of 
greater financial resources, stronger sales and marketing efforts, and other 
factors. These entities may succeed in developing products that are safer, 
more effective or less costly than the products developed by the Company. 
There can be no assurance that any products developed by the Company will be 
able to compete successfully with any of those products. 

                                9           
<PAGE>
GOVERNMENT REGULATION; NO ASSURANCES OF REGULATORY APPROVAL 

   The Company's research and development activities, preclinical studies, 
clinical trials, and the manufacturing and marketing of its products are 
currently subject to extensive regulation by the FDA and may in the future be 
subject to foreign regulations. The drug approval process takes many years 
and requires the expenditure of substantial resources. Data obtained from 
preclinical and clinical activities are susceptible to varying 
interpretations that could delay, limit, or prevent regulatory approval. 
Although the Company may consult the FDA for guidance in developing protocols 
for clinical trials, that consultation provides no assurance that the FDA 
will accept the clinical trials as adequate or well-controlled or accept the 
results of those trials. In addition, delays or rejections of applications 
for regulatory approval may result from changes in or additions to FDA 
regulations concerning the drug approval process. Similar delays may also be 
encountered in foreign countries. There can be no assurance that any 
regulatory review will be conducted in a timely manner or that regulatory 
approvals will be obtained for any products developed by the Company, 
including NIASPAN. Even if regulatory approval of a product is obtained, the 
approval may be limited as to the indicated uses for which it may be promoted 
or marketed. In addition, a marketed drug, its bulk chemical supplier, its 
manufacturer and its manufacturing facilities are subject to continual 
regulatory review and periodic inspections, and later discovery of previously 
unknown problems with a product, supplier, manufacturer or facility may 
result in restrictions on such products or manufacturers, which may require a 
withdrawal of the product from the market. Failure to comply with the 
applicable regulatory requirements can, among other things, result in fines, 
suspensions of regulatory approvals, product recalls, operating restrictions 
and criminal prosecution, any of which could have a material adverse effect 
on the Company. 

   The Company's business is also subject to regulation under state, federal 
and local laws, rules, regulations and policies relating to the protection of 
the environment and health and safety, including those governing the use, 
generation, manufacture, storage, air emission, effluent discharge, handling 
and disposal of certain materials. The Company believes that it is in 
compliance in all material respects with all such laws, rules, regulations 
and policies applicable to the Company. There can be no assurance that the 
Company will not be required to incur significant costs to comply with such 
environmental and health and safety laws and regulations in the future. The 
Company's research and development involves the controlled use of hazardous 
materials. Although the Company believes that its safety procedures for 
handling and disposing of such materials comply with the standards prescribed 
by applicable state, federal and local regulations, the risk of contamination 
or injury from these materials cannot be completely eliminated. In the event 
of such contamination or injury, the Company could be held liable for any 
damages that result and any such liability could exceed the resources of the 
Company and materially adversely affect the Company's business, financial 
condition and results of operations. One of the Company's products under 
development involves the use of CFC propellants. The use of CFC propellants 
is subject to significant U.S. and foreign regulations. Moreover, it is 
possible that future international treaties or U.S. or foreign government 
regulations will prohibit the use of CFC propellants. See 
"Business--Government Regulation" and "Business--Respiratory Products." 

DEPENDENCE ON FUISZ TECHNOLOGIES LTD. AND OTHER COLLABORATORS 

   The Company may rely on third parties for certain aspects of the 
development of certain of its products under development. The Company has 
entered into agreements with Fuisz Technologies Ltd. ("Fuisz") pursuant to 
which the Company and Fuisz have agreed to collaborate in the development of 
captopril, isosorbide-5-mononitrate ("IS-5-MN"), and the lipid-altering 
combination product, as well as certain other products in the future. Under 
the terms of these agreements, Kos is responsible for conducting 
pharmacokinetic studies and clinical trials and Fuisz is responsible for the 
formulation of such products. The Company is not aware of any approved 
products that use Fuisz' microsphere technology, which will be used in the 
future in certain of the Company's products under development. The Company's 
ability to commercialize these products may depend to a significant extent 
on the efforts of Fuisz, over which the Company has no control. There can be 
no assurance that Fuisz will be successful in developing any of the Company's 
products under development. The failure of Fuisz to develop any of the 
Company's products may have a material adverse effect on the Company. The 


                               10           
<PAGE>
Company may also rely on other third parties for certain aspects of the 
development of the Company's presently planned or future products. There can 
be no assurance that the Company will be able to enter into future 
collaborative arrangements on favorable terms, or at all. Even if the Company 
is successful in entering into such collaborative agreements, there can be no 
assurance that any such arrangement will be successful. The success of any 
such arrangement is dependent on, among other things, the skills, experience 
and efforts of the third party's employees responsible for the project, the 
third party's commitment to the arrangement, and the financial condition of 
the third party, all of which are beyond the control of the Company. 

LIMITED MANUFACTURING EXPERIENCE; RISK OF SCALE-UP 

   Although the Company has manufactured sufficient quantities of certain of 
its products to facilitate the conduct of human clinical trials and extensive 
testing and research, the Company has no experience manufacturing products 
for commercial purposes. At present, the Company manufactures clinical 
materials in two manufacturing plants, both of which the Company believes 
operate in substantial compliance with current Good Manufacturing Practices 
("cGMP") regulations for the manufacture of pharmaceutical products. The 
Company may need to further scale-up certain of its current manufacturing 
processes to achieve production levels consistent with the commercial sale of 
its products. Further, modifications to the facilities, systems and 
procedures may be necessary to maintain compliance with cGMP regulations and 
other regulations prescribed by various regulatory agencies including the 
Occupational Safety and Health Administration and the Environmental 
Protection Agency, in connection with manufacture for commercial sale. 
Failure by the Company to successfully further scale-up or modify its 
manufacturing process or to comply with cGMP regulations and other 
regulations could delay the approval of the Company's products under 
development or limit the Company's ability to meet the demand for its 
products, either of which would have a material adverse effect on the 
Company. Such occurrences may require the Company to acquire alternative 
means of manufacturing its products, which may not be available to the 
Company on a timely basis, on commercially practicable terms, or at all. 

FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING 

   The Company has experienced negative cash flows from operations since its
inception and has funded its activities to date by capital contributions and,
since July 1, 1996, a loan from Kos Investments, Inc. represented by a
promissory note convertible at the option of the holder into Common Stock at the
initial public offering price (the "Convertible Note"). Assuming successful
commercial launch of NIASPAN, the Company anticipates positive cash flows from
operations in 1998. The Company anticipates that it will use a portion of the
net proceeds of the offering to repay all or a portion of the Convertible Note.
See "Certain Transactions." The Company has expended and will continue to be
required to expend substantial funds to continue research and development,
including clinical trials of its products under development, and to commence
sales and marketing efforts if regulatory approvals are obtained. Although the
Company believes that the net proceeds of this offering (after repayment, if
any, of the Convertible Note) will be sufficient to fund the operations of the
Company for at least the next twelve months, the Company may need or elect to
raise additional capital. The Company's capital requirements will depend on many
factors, including the problems, delays, expenses and complications frequently
encountered by development stage companies; the progress of the Company's
research, development and clinical trial programs; the costs and timing of
seeking regulatory approvals of the Company's products under development; the
Company's ability to obtain such regulatory approvals; the success of the
Company's sales and marketing programs; costs in filing, prosecuting, defending
and enforcing any patent claims and other intellectual property rights; the
extent and terms of any collaborative research, manufacturing, marketing or
other arrangements; and changes in economic, regulatory or competitive
conditions or the Company's planned business. Estimates about the adequacy of
funding for the Company's activities are based on certain assumptions, including
the assumption that testing and regulatory procedures relating to the Company's
products


                               11           
<PAGE>
under development can be conducted at projected costs and within projected 
time frames and that the Company's NIASPAN product receives regulatory 
approval on a timely basis and is successfully marketed. 

   To satisfy its capital requirements, the Company may seek to raise funds 
in the public or private capital markets. The Company's ability to raise 
additional funds in the public or private markets will be adversely affected 
if the results of the Company's ongoing or future clinical trials are not 
favorable or if regulatory approval for any of the Company's products under 
development is not obtained. The Company may seek additional funding through 
corporate collaborations and other financing vehicles. There can be no 
assurance that any such funding will be available to the Company, or if 
available, that it will be available on acceptable terms. If adequate funds 
are not available, the Company may be required to curtail significantly one 
or more of its research or development programs or it may be required to 
obtain funds through arrangements with future collaborative partners or 
others that may require the Company to relinquish rights to some or all of 
its technologies or products under development. If the Company is successful 
in obtaining additional financing, the terms of the financing may have the 
effect of diluting or adversely affecting the holdings or the rights of the 
holders of Common Stock. See "Management's Discussion and Analysis of 
Financial Condition and Results of Operations--Liquidity and Capital 
Resources." 

DEPENDENCE ON SINGLE SOURCES OF SUPPLY 

   Some materials used in the Company's products, including the active 
ingredient in NIASPAN, are currently sourced from a single qualified 
supplier. The Company does not have a contractual arrangement with the sole 
supplier of the active ingredient in NIASPAN pursuant to which the Company 
obtains such ingredient. Although the Company has not experienced difficulty 
in acquiring materials for product development to date, no assurance can be 
given that supply interruptions will not occur in the future or that the 
Company will not have to obtain substitute materials, which would require 
additional product validations and regulatory submissions. Any such 
interruption of supply could have a material adverse effect on the Company's 
ability to manufacture its products or to obtain or maintain regulatory 
approval of such products. 

NO ASSURANCE OF ADEQUATE THIRD-PARTY REIMBURSEMENT 

   The Company's ability to commercialize successfully its products under 
development is dependent in part on the extent to which appropriate levels of 
reimbursement for the Company's products and related treatments are obtained 
from government authorities, private health insurers and other organizations, 
such as health maintenance organizations ("HMOs"). Third-party payors are 
increasingly challenging the pricing of pharmaceutical products. The trend 
toward managed healthcare in the U.S., the growth of organizations such as 
HMOs and legislative proposals to reform healthcare and government insurance 
programs could significantly influence the purchase of pharmaceutical 
products, resulting in lower prices and reduced demand for the Company's 
products under development. Such cost containment measures and healthcare 
reform could affect the Company's ability to sell its products under 
development and may have a material adverse effect on the Company. 
Significant uncertainty exists about the reimbursement status of newly 
approved pharmaceutical products. There can be no assurance that 
reimbursement in the United States or foreign countries will be available for 
any of the Company's products under development, that any reimbursement 
granted will be maintained or that limits on reimbursement available from 
third-party payors will not reduce the demand for, or negatively affect the 
price of, the Company's products under development. The unavailability or 
inadequacy of third-party reimbursement for the Company's products under 
development would have a material adverse effect on the Company. 

RISK OF PRODUCT LIABILITY CLAIMS; NO ASSURANCE OF ADEQUATE INSURANCE 

   Testing, manufacturing, marketing, and selling the Company's products 
under development entails a risk of product liability. Although the Company 
carries clinical trial product liability insurance in the aggregate amount of 
$3,000,000, there can be no assurance that the existing coverage is adequate. 
Furthermore, this existing coverage may not be adequate as the Company 
further develops products. If 

                               12           
<PAGE>
the Company receives the required regulatory approvals and begins to sell 
NIASPAN or any of its other products under development, there can be no 
assurance that additional liability insurance coverage for a commercialized 
product will be available in the future on acceptable terms, if at all. The 
Company's business could be adversely affected by the assertion of a product 
liability claim, and the Company could be rendered insolvent if it does not 
have sufficient financial resources to satisfy any liability resulting from 
such a claim or to fund the legal defense of such a claim. 

DEPENDENCE ON KEY PERSONNEL 

   The success of the Company is dependent on its ability to attract and 
retain highly qualified scientific and management personnel. The Company 
faces intense competition for personnel from other companies, academic 
institutions, government entities and other organizations. There can be no 
assurance that the Company will be successful in attracting and retaining key 
personnel. The loss of key personnel, or the inability to attract and retain 
the additional, highly-skilled employees required for the expansion of the 
Company's activities, could adversely affect the Company's results of 
operations and its business. See "Management." 

SHARES ELIGIBLE FOR FUTURE SALE; REGISTRATION RIGHTS 

   The Company's sole shareholder, each current holder of options to acquire 
Common Stock and Kos Investments, Inc., which holds the Convertible Note, 
have agreed not to sell shares of Common Stock for a period of 180 days from 
the date of this Prospectus. The Company has granted certain registration 
rights to the Company's sole shareholder and to Kos Investments, Inc., the 
holder of the Convertible Note, which entitle such entities to cause the 
Company to effect three registrations under the Securities Act of sales of 
shares of the Company's Common Stock owned by such entities. By exercising 
these registration rights, these entities could cause a large number of 
shares to be registered and become freely tradeable without restrictions 
under the Securities Act (except for those purchased in the offering by 
affiliates of the Company) immediately upon the effectiveness of such 
registration. In addition, the Company intends to file, after the expiration 
of such 180 day period, registration statements under the Securities Act to 
register an aggregate of 4,000,000 shares of Common Stock issued or reserved 
for issuance under the Company's employee benefit plans. Such sales may have 
an adverse effect on the market price of the Common Stock and could impair 
the Company's ability to raise additional capital. See "Shares Eligible for 
Future Sale" and "Underwriting." 

NO PRIOR PUBLIC MARKET; POSSIBLE STOCK PRICE VOLATILITY 

   Prior to this offering, there has been no public market for shares of the 
Common Stock. Although the Company has submitted an application to have the 
Common Stock approved for quotation on the Nasdaq National Market system, 
there can be no assurance that a regular trading market will develop or be 
sustained after the offering. The initial public offering price for the 
Common Stock will be determined by negotiations between the Company and the 
representatives of the Underwriters. See "Underwriting." The stock market, 
including the Nasdaq National Market, on which the Company's shares are 
expected to be quoted, has from time to time experienced significant price 
and volume fluctuations that may be unrelated to the operating performance of 
particular companies. In addition, the market price of the Common Stock, like 
the stock prices of many publicly traded pharmaceutical and biotechnology 
companies, may prove to be highly volatile. Announcements of technological 
innovations or new commercial products by the Company or its competitors, 
developments or disputes concerning patent or proprietary rights, publicity 
regarding actual or potential medical results relating to products under 
development by the Company or its competitors, regulatory developments in 
either the United States or foreign countries, public concern as to the 
safety of pharmaceutical and biotechnology products and economic and other 
external factors, as well as period-to-period fluctuations in financial 
results, among other factors, may have a significant impact on the market 
price of the Common Stock. 

                               13           
<PAGE>
CONTROL BY EXISTING SHAREHOLDER 

   Upon completion of this offering, Michael Jaharis, the Chairman of the 
Board of Directors of the Company and one of its founders, will beneficially 
own approximately 71% of the outstanding Common Stock (approximately 68% if 
the Underwriters exercise their over-allotment option in full), excluding 
893,000 shares of Common Stock issuable to Kos Investments upon conversion, 
if any, of the Convertible Note. Accordingly, this shareholder will be able 
to control the outcome of shareholder votes, including votes concerning the 
election of directors, the adoption or amendment of provisions in the 
Company's Articles of Incorporation, and the approval of mergers and other 
significant corporate transactions. This level of concentrated ownership by 
one person, along with the factors described in "Risk Factors--Anti-Takeover 
Provisions," may have the effect of delaying or preventing a change in the 
management or voting control of the Company. See "Principal Shareholders." 

ANTI-TAKEOVER PROVISIONS 

   Certain provisions of the Company's Articles of Incorporation and Bylaws, 
as well as the Florida Business Corporation Act, could discourage a third 
party from attempting to acquire, or make it more difficult for a third party 
to acquire, control of the Company without approval of the Company's Board of 
Directors. Such provisions could also limit the price that certain investors 
might be willing to pay in the future for shares of the Common Stock. Certain 
of such provisions allow the Board of Directors to authorize the issuance of 
preferred stock with rights superior to those of the Common Stock. Moreover, 
certain provisions of the Company's Articles of Incorporation or Bylaws 
generally permit removal of directors only for cause by a 60% vote of the 
shareholders of the Company, require a 60% vote of the shareholders to amend 
the Company's Articles of Incorporation or Bylaws, require a demand of at 
least 50% of the Company's shareholders to call a special meeting of 
shareholders, and prohibit shareholder actions by written consent. See 
"Description of Capital Stock." 

DILUTION; ABSENCE OF DIVIDENDS 

   Purchasers of the Common Stock in the offering will experience an immediate
dilution in net tangible book value of $11.39 per share. These investors will
also experience additional dilution upon the exercise of outstanding options.
See "Dilution." The Company intends to retain earnings, if any, for use in its
business and does not anticipate paying any cash dividends in the foreseeable
future. See "Dividend Policy."

                               14           
<PAGE>
                                 THE COMPANY 

   The Company's predecessor, Kos Holdings, Inc. ("Holdings"), which was 
previously named Kos Pharmaceuticals, Inc., was incorporated in Florida on 
July 1, 1988, to develop prescription pharmaceutical products principally for 
the cardiovascular and respiratory markets. On June 25, 1996, Kos (named 
after the Greek Island where Hippocrates founded the science of medicine) was 
incorporated in Florida as the successor to the business of Holdings. On June 
30, 1996, all of the assets and all of the liabilities of Holdings were 
transferred to the Company in exchange for shares of common stock of the 
Company (the "Reorganization"). The Reorganization was accomplished in order 
to transfer the assets and operations of Holdings to the Company while 
preserving Holdings' net operating loss carryforwards and related tax 
benefits for Holdings. As a result, the Company had no tax assets or 
liabilities as of June 30, 1996. Kos Investments, Inc. ("Kos Investments") is 
the sole shareholder of Holdings. Kos Investments is wholly-owned by, and 
serves as an investment vehicle for Michael Jaharis, one of the Company's 
founders and its Chairman, who has solely financed the Company's operations 
from inception. All references in this Prospectus to the Company include its 
wholly-owned subsidiary, Aeropharm Technology, Inc. ("Aeropharm"), and the 
business and operations of Holdings, its predecessor company, until June 30, 
1996. 

   The Company's principal executive offices are located at 1001 Brickell Bay 
Drive, Suite 2502, Miami, Florida 33131, and its telephone number is (305) 
577-3464. 

                               USE OF PROCEEDS 

   The net proceeds to the Company from the sale of Common Stock offered hereby
are approximately $57.3 million ($66.0 million if the Underwriters'
over-allotment option is exercised in full), after deducting underwriting
discounts and commissions and estimated offering expenses payable by the
Company. The Company intends to use approximately $13 million to fund the
Company's research and development programs, approximately $6 million to
establish a sales and marketing organization and to fund marketing expenses
related to the commercial launch of NIASPAN, and the remaining amount for
general corporate purposes and working capital. The Company may, in the
discretion of its Board of Directors, use a portion of the proceeds to repay all
or a portion of the Convertible Note and currently anticipates that it will use
at least $8 million for such purpose. Kos Investments has the option to convert
such note into shares of Common Stock at the initial public offering price. No
assurance can be given as to whether Kos Investments will exercise such option.
The Convertible Note bears interest at First Union National Bank of Florida's
prime rate commencing July 1, 1996, escalating to a rate of 1% over such prime
rate during calendar year 1997, 2% over such prime rate during calendar year
1998, and 3% over such prime rate during calendar year 1999, until the maturity
date of June 30, 1999. As of March 7, 1997, the amount outstanding on the
Convertible Note was $13,395,000. These borrowings were incurred to fund the
Company's operations since July 1, 1996. See "Certain Transactions." The Company
may also use a portion of the net proceeds to acquire businesses, technologies
or products complementary to the Company's business, although the Company does
not currently have any commitment or agreement for any such acquisitions. No
material transactions of this nature are currently planned or being negotiated.
Pending application of the proceeds as described above, the Company intends to
invest the net proceeds of this offering in short-term, investment grade,
interest-bearing securities.

                               DIVIDEND POLICY 

   The Company intends to retain earnings, if any, for use in its business 
and, therefore, does not anticipate paying any cash dividends in the 
foreseeable future. Any future determination as to the payment of cash 
dividends will be made at the discretion of the Board of Directors and will 
depend upon the financial condition, capital requirements and earnings of the 
Company, as well as upon other factors that the Board of Directors may deem 
relevant. The Company has not paid any cash dividends since inception. 

                               15           
<PAGE>
                                CAPITALIZATION 

   The following table sets forth the capitalization of the Company (i) as of 
December 31, 1996, and (ii) on an adjusted basis to reflect receipt and 
application of the estimated net proceeds, after deducting underwriting 
discounts and commissions and estimated expenses payable by the Company, from 
the sale of 4,150,000 shares of Common Stock pursuant to this offering. As of 
December 31, 1996, the Company's outstanding principal balance under the 
Convertible Note was $8,355,000. See "Use of Proceeds" and "Certain 
Transactions." 

<TABLE>
<CAPTION>
                                                                         DECEMBER 31, 1996 
                                                                    ---------------------------
                                                                       ACTUAL      AS ADJUSTED 
                                                                    ----------- --------------
                                                                           (IN THOUSANDS) 
<S>                                                                 <C>          <C>
Short-term debt ..................................................    $  8,355      $     --
                                                                                --------------
Shareholders' equity (deficit): 
 Common stock; $.01 par value; 50,000,000 shares authorized; 
   10,000,000 shares issued and outstanding, and 14,150,000 issued 
   and outstanding, as adjusted (1) ..............................    $    100           142 
 Additional paid-in capital ......................................      58,472       115,717
Deficit accumulated during the development stage .................     (64,782)      (64,782) 
                                                                    ----------- --------------
Total shareholders' equity (deficit) .............................      (6,210)       51,077 
                                                                    ----------- --------------
Total capitalization .............................................    $  2,145      $ 51,077 
                                                                    =========== ============== 
</TABLE>

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

(1) Excludes 3,675,000 shares of Common Stock reserved for issuance under the 
    Company's 1996 Stock Option Plan and 325,000 shares of Common Stock 
    reserved for issuance upon exercise of other outstanding options. Options 
    to acquire an aggregate of 2,330,500 shares of Common Stock at a weighted 
    average exercise price of $4.44 per share were issued and outstanding as 
    of December 31, 1996. Excludes 557,000 shares of Common Stock issuable at 
    December 31, 1996, to Kos Investments upon the conversion, if any, of the 
    Convertible Note. 

                               16           
<PAGE>
                                   DILUTION 

   The net tangible book value of the Company as of December 31, 1996 was 
approximately $(6,210,000), or $(0.62) per share. Net tangible book value per 
share represents the amount of the Company's shareholder's equity, less 
intangible assets, divided by 10,000,000, the number of shares of Common 
Stock outstanding as of December 31, 1996. 

   Net tangible book value dilution per share represents the difference between
the amount per share paid by purchasers of shares of Common Stock in this
offering and the net tangible book value per share of Common Stock immediately
after completion of this offering. After giving effect to the sale of 4,150,000
shares of Common Stock in this offering at the initial public offering price of
$15.00 per share and after deducting underwriting discounts and commissions and
estimated offering expenses payable by the Company, the net tangible book value
of the Company as of December 31, 1996 would have been $51,083 or $3.61 per
share. This represents an immediate increase in net tangible book value of $4.23
per share to the existing shareholder and an immediate dilution in net tangible
book value of $11.39 per share to purchasers of Common Stock in this offering,
as illustrated in the following table:

<TABLE>
<CAPTION>
<S>                                                              <C>         <C>
 Initial public offering price per share ...............                       $15.00 
 Net tangible book value per share as of December 31, 1996  ...    $(0.62) 
 Increase per share attributable to new investors  ............      4.23 
                                                                   ------- 
Pro forma net tangible book value per share after this 
 offering .....................................................                $ 3.61
                                                                               ------
Dilution per share to new investors ...........................                $11.39 
                                                                               ====== 
</TABLE>

   Utilizing the foregoing assumptions, the following table summarizes the 
total consideration paid to the Company and the average price per share paid 
by the existing shareholder and by new investors purchasing shares of the 
Common Stock in this offering. 

<TABLE>
<CAPTION>
                                SHARES PURCHASED               TOTAL CONSIDERATION 
                        -------------------------------  ------------------------------
                                                                                            AVERAGE PRICE 
                             NUMBER         PERCENTAGE        AMOUNT        PERCENTAGE        PER SHARE 
                        ---------------- -------------  --------------- ------------- -------------------
<S>                     <C>               <C>             <C>              <C>            <C>
Existing Shareholder       10,000,000(1)        71%        $ 52,989,000          46%           $ 5.30 
New Investors ........      4,150,000           29           62,250,000          54             15.00 
                        ---------------- -------------  --------------- ------------- ----------------
  Total ..............     14,150,000          100%        $115,239,000         100% 
                        ================  =============   ============= =============    
</TABLE>

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

(1) If the Convertible Note is converted to shares of Common Stock, the 
    Shares Purchased by Existing Shareholders in the table will be 10,893,000 
    as of March 7, 1997, for Total Consideration of $66,384,000, and for 
    Average Price Per Share of $6.09. 

   The foregoing table excludes 3,675,000 shares of Common Stock reserved for 
issuance under the Company's 1996 Stock Option Plan and 325,000 shares of 
Common Stock reserved for issuance upon exercise of other outstanding 
options. Options to acquire an aggregate of 2,330,500 shares of Common Stock 
at a weighted average exercise price of $4.44 per share were issued and 
outstanding as of December 31, 1996. See "Management--Stock Option Plan" and 
Note 6 of Notes to Consolidated Financial Statements. To the extent 
outstanding options are exercised, there will be future dilution to investors 
in this offering. See "Management--Employee Benefit Plans--Stock Option 
Plan.". 

                               17           
<PAGE>
                     SELECTED CONSOLIDATED FINANCIAL DATA 

   The following selected consolidated financial data should be read in 
conjunction with "Management's Discussion and Analysis of Financial Condition 
and Results of Operations" and the Company's consolidated financial 
statements and related notes included elsewhere in this Prospectus. The 
statement of operations data for the five years ended June 30, 1996 and the 
balance sheet data at June 30, 1992, 1993, 1994, 1995 and 1996 are derived 
from the financial statements and the notes thereto of the Company audited by 
Arthur Andersen LLP. The selected financial data, as of and for the six 
months ended December 31, 1995 and 1996, have been derived from unaudited 
financial statements of the Company that, in the opinion of management, 
include all adjustments, consisting of normal recurring adjustments, 
necessary for a fair presentation as of and for such periods. The results of 
operations for the six months ended December 31, 1996 are not necessarily 
indicative of the results of operations to be expected for the entire fiscal 
year. 
<TABLE>
<CAPTION>
                                                         YEAR ENDED JUNE 30, 
                                    -----------------------------------------------------------
                                         1992            1993           1994           1995 
                                    -------------- -------------  ------------- ---------------
                                                  (IN THOUSANDS, EXCEPT SHARE DATA) 
<S>                                 <C>             <C>             <C>            <C>
STATEMENT OF OPERATIONS: 
  Revenues .......................    $        --   $         --    $         22    $        14 
Operating expenses: 
 Research and development ........          2,476          4,930           6,663          8,387 
 General and administrative  .....            975          1,232           1,619          1,614 
 Expense recognized on 
   modification of stock option 
   grants(1) .....................             --             --              --            --
                                    -------------   ------------    ------------  -------------
  Total operating expenses  ......          3,451          6,162           8,282         10,001 
Other income .....................             (1)            (1)             (2)            --
Interest (income) expense, net  ..            428            556           1,058          1,026 
Interest expense-related parties               15             29              50             26 
                                    -------------   ------------    ------------  -------------
Total other (income) expense  ....            442            584           1,106          1,052 
                                    -------------   ------------    ------------  -------------
Loss before minority interest  ...         (3,893)        (6,746)         (9,366)       (11,039) 
Minority interest(2) .............             --             --            (164)             1 
                                    -------------   ------------    ------------  -------------
Net loss .........................    $    (3,893)   $    (6,746)    $    (9,530)   $   (11,038) 
                                    =============   ============    ============  ============= 
Net loss per share (3) ...........    $     (0.34)   $     (0.59)    $     (0.84)   $     (0.97) 
                                    =============   ============    ============  ============= 
Weighted average common shares in 
  computing net loss per share(3)      11,340,000     11,340,000      11,340,000     11,340,000 
</TABLE>

                    (RESTUBBED TABLE CONTINUED FROM ABOVE) 

<TABLE>
<CAPTION>
                                                           SIX MONTHS             
                                                              ENDED               JULY 1, 1988
                                                           DECEMBER 31,          (INCEPTION) TO
                                    ------------- ----------------------------    DECEMBER 31, 
                                         1996           1995           1996           1996
                                    ------------- -------------  -------------  ----------------
                                                           (UNAUDITED)            (UNAUDITED) 
<S>                                 <C>            <C>             <C>            <C>
STATEMENT OF OPERATIONS: 
  Revenues .......................   $        --   $        --    $        --    $           37 
Operating expenses: 
 Research and development ........        13,816          6,426           6,057          44,762 
 General and administrative  .....         1,772            789           1,936          10,808 
 Expense recognized on 
   modification of stock option 
   grants(1) .....................         5,436             --              --           5,436 
                                    ------------   ------------    ------------  --------------
  Total operating expenses  ......        21,024          7,215           7,993          61,006 
Other income .....................            --             --              --             (10) 
Interest (income) expense, net  ..           (14)            (8)             (5)          3,409 
Interest expense-related parties              --             --             136             266 
                                    ------------   ------------    ------------  --------------
Total other (income) expense  ....           (14)            (8)            131           3,665 
                                    ------------   ------------    ------------  --------------
Loss before minority interest  ...       (21,010)        (7,207)         (8,124)        (64,634) 
Minority interest(2) .............            16              1              --            (148) 
                                    ------------   ------------    ------------  --------------
Net loss .........................   $   (20,994)   $    (7,206)    $    (8,124)    $   (64,782) 
                                    ============   ============    ============  ============== 
Net loss per share (3) ...........   $     (1.85)   $     (0.64)    $     (0.72)    $     (5.71) 
                                    ============   ============    ============  ============== 
Weighted average common shares in 
  computing net loss per share(3)     11,340,000     11,340,000      11,340,000      11,340,000 
</TABLE>


<TABLE>
<CAPTION>
                                                                                JUNE 30,                                           
                                                    --------------------------------------------------------------    DECEMBER 31,
                                                       1992         1993         1994         1995          1996         1996
                                                    ---------- -----------  ----------- ----------- -------------- ---------------
                                                                                               (IN THOUSANDS)         (UNAUDITED) 
<S>                                                 <C>         <C>           <C>          <C>          <C>             <C>
BALANCE SHEET(4): 
Cash and cash equivalents ........................    $    27     $     13     $     18     $     41      $    193      $    358 
Working capital (deficit)(5) .....................     (8,407)     (15,235)     (25,394)      (1,129)           (8)       (8,816) 
   
Total assets .....................................        586          686        1,574        2,355         2,281         3,197 
Total debt .......................................      8,232       14,742       24,790           --            --         8,355 
Deficit accumulated during the development stage       (8,350)     (15,096)     (24,626)     (35,664)      (56,658)      (64,782) 
   
Shareholder's equity (deficit)(5) ................     (7,860)     (14,606)     (24,136)         943         1,914        (6,210) 
   
</TABLE>

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

(1) Reflects a non-cash charge associated with an extension of the exercise 
    period for stock options granted during 1988 to 1990 to the Company's 
    Chief Executive Officer and two independent consultants; no other 
    material economic terms of these options were changed. 

(2) Represents the minority shareholder's interest in Aeropharm, which 
    interest was acquired by the Company in June 1996. 

(3) See Note 2 of Notes to Consolidated Financial Statements for information 
    concerning the computation of net loss per share. Assuming the issuance 
    only of sufficient shares to repay the indebtedness outstanding as of 
    December 31, 1996, supplementary pro forma net loss per share of common 
    stock would be $(0.67) for the six month period ended December 31, 1996. 

(4) The Company has funded its operations since July 1, 1996 using the 
    proceeds of the Convertible Note. As of March 7, 1997, the Company had 
    outstanding borrowings of $13,395,000 under the Convertible Note. See 
    "Use of Proceeds." 

(5) In March 1995, Investments assumed repayment of a note payable to a bank 
    in the principal amount of $30,372,000. This assumption was accounted for 
    as a transfer to Investments and as an increase in additional paid-in 
    capital. See Note 4 of Notes to Consolidated Financial Statements. 

                               18           
<PAGE>
                   MANAGEMENT'S DISCUSSIONS AND ANALYSIS OF 
                FINANCIAL CONDITION AND RESULTS OF OPERATIONS 

INTRODUCTION 

   A predecessor corporation to the Company was formed in July 1988 under the 
name of Kos Pharmaceuticals, Inc., principally to conduct research and 
development on new formulations of existing prescription pharmaceutical 
products. In June 1993, Aeropharm Technologies, Inc., a then majority-owned 
subsidiary of the Company, was formed to conduct research and development 
activities on aerosolized MDI products for the treatment of respiratory 
diseases. During June 1996, this predecessor corporation acquired the 
outstanding minority interest in Aeropharm; changed its name to Kos Holdings, 
Inc.; established the Company as a wholly-owned subsidiary under the name Kos 
Pharmaceuticals, Inc.; and, effective as of June 30, 1996, transferred all of 
its existing assets, liabilities and intellectual property, other than 
certain net operating loss carryforwards, to the Company. Accordingly, all 
references in this Prospectus to the Company's business include the business 
and operations of Holdings until June 30, 1996. 


   Since inception, the Company has been a development stage company engaged
primarily in the development of cardiovascular and respiratory pharmaceutical
products. The Company has not recorded any significant revenues since inception
and has funded its operations exclusively through equity contributions from its
sole shareholder. Through December 31, 1996, the Company had accumulated a
deficit from operations of $64.8 million. In connection with the transfer of
operations from Holdings to the Company on June 30, 1996, net operating loss
carryforwards amounting to approximately $51.0 million and related tax benefits
were retained by Holdings and not transferred to the Company. Consequently, the
Company had no deferred tax assets or liabilities as of June 30, 1996. The
Company expects to continue to incur significant operating losses for at least
the next 12 months. 


RESULTS OF OPERATIONS 

  SIX MONTHS ENDED DECEMBER 31, 1995 AND 1996 

   The Company's research and development expenses decreased from $6.4 
million for the six months ended December 31, 1995 to $6.1 million for the 
six months ended December 31, 1996. The decrease was attributable primarily 
to the absence in the December 1996 quarter of the clinical trials that were 
completed late in calendar 1995 in support of the filing of a NDA during May 
1996 for the Company's first product, NIASPAN. The decrease in clinical trial 
costs was partially offset by an increase in personnel costs, principally in 
connection with manufacturing scale-up and by an increase in development 
costs associated with various third party development agreements. The Company 
expects research and development activities to increase as personnel are 
added and development activities are expanded to support the development of 
additional products and conduct additional clinical trials. 

   General and administrative expenses increased from $789,000 for the six 
months ended December 31, 1995 to $1.9 million for the six months ended 
December 31, 1996. The increase was primarily attributable to the hiring of 
additional personnel to support the Company's marketing activities and 
administrative functions, and professional fees. The Company expects that its 
general and administrative expenses will continue to increase in support of 
its marketing efforts and research and development programs. 

   Since July 1, 1996, the Company has funded its operations from the 
proceeds of a loan from Kos Investments, the sole shareholder of Holdings. As 
of December 31, 1996, the Company had outstanding borrowings of approximately 
$8.4 million outstanding under the Convertible Note. As a result of this 
loan, the Company had $136,000 of interest expense for the six months ended 
December 31, 1996, 

                               19           
<PAGE>
compared with no such expense for the six months ended December 31, 1995. The 
Company expects to increase the amount of such borrowings from Kos 
Investments, Inc. to finance its operating activities through the completion 
of this offering. 

   The Company incurred a net loss of $7.2 million for the six months ended 
December 31, 1995 compared with a net loss of $8.1 million for the six months 
ended December 31, 1996. The Company expects to report substantial losses for 
at least the next 12 months. 

  FISCAL YEARS ENDED JUNE 30, 1995 AND 1996 

   The Company's research and development expenses increased from $8.4 
million for the fiscal year ended June 30, 1995 to $13.8 million for the year 
ended June 30, 1996. This increase was attributable primarily to licensing 
and development programs, hiring of additional personnel and increased 
clinical trials costs. Of the total increase in research and development 
expenses for the fiscal year ended June 30, 1996, $1.0 million is 
attributable to a payment by the Company in connection with the execution of 
an agreement with Fuisz to form a joint venture for the development of a 
future product. This product is in the very early stages of development and 
the Company cannot estimate when or if a commercially viable product will be 
developed. The parties have generally agreed to share the expenses of 
developing the product. Hiring of additional personnel principally related to 
manufacturing scale-up of certain of the Company's products under development 
and to support the filing of a NDA for NIASPAN. 

   General and administrative expenses increased from $1.6 million for the 
fiscal year ended June 30, 1995 to $1.8 million for the fiscal year ended 
June 30, 1996. This increase was attributable principally to the hiring of 
additional personnel to support the Company's administrative functions, and 
to the acquisition of market research data. 

   In June 1996, the Company recorded a non-cash charge of $5.4 million for 
compensation expense associated with an adjustment of the exercise period on 
certain stock options granted during 1988 to 1990 to an officer and to two 
independent consultants of the Company. 

   During December 1994, the Company transferred its existing line of credit 
facility with a local bank and its accumulated borrowings to Kos Investments, 
Inc., the sole shareholder of Holdings. The effect of this transfer was to 
increase the Company's paid-in capital in the amount of its accumulated 
borrowings, of $30.4 million, outstanding on the date of transfer. As a 
result of this transfer, the Company had $1.1 million of interest expense for 
the fiscal year ended June 30, 1995 compared with no such expense for the 
fiscal year ended June 30, 1996. 

   The Company incurred a net loss of $11.0 million for the fiscal year ended 
June 30, 1995 compared with $21.0 million for the fiscal year ended June 30, 
1996. 

  FISCAL YEARS ENDED JUNE 30, 1994 AND 1995 

   Research and development expenses increased from $6.7 million for the 
fiscal year ended June 30, 1994 to $8.4 million for the fiscal year ended 
June 30, 1995. This increase was attributable principally to hiring of 
additional personnel in support of the Company's clinical trial activities on 
NIASPAN. Research and development expenses also were higher in 1995 because 
it was the first full year of operation of the Company's aerosol research and 
development facility, which was launched during 1994. 

   General and administrative expenses, at $1.6 million, were essentially 
unchanged from 1994. 

   As more fully explained above, during December 1994 the Company 
transferred its existing credit facility with a local bank to Kos 
Investments, Inc. As a result of the timing of this transfer, interest 
expense decreased approximately $50,000 from the fiscal year ended June 30, 
1994 to the fiscal year ended June 30, 1995. 

                               20           
<PAGE>
   Minority interest expense decreased approximately $160,000 during the 
fiscal year ended June 30, 1995 principally as a result of timing differences 
in equity contributions made by the Company to its then majority-owned 
aerosol subsidiary. 

   During 1995, revenue was recognized from consulting activities conducted 
by the Company's Vice President of Aerosol Research and Development. These 
consulting activities were of a non-recurring nature. 

   As a result of the foregoing, the Company incurred a net loss of $9.5 
million for the fiscal year ended June 30, 1994 compared with $11.0 million 
for the fiscal year ended June 30, 1995. 

LIQUIDITY AND CAPITAL RESOURCES 

   The Company financed its operations since inception until June 30, 1996
through capital contributions from Kos Investments, which totaled an aggregate
of approximately $53.0 million as of June 30, 1996. Since July 1, 1996 the
Company has financed its operations from the proceeds of the Convertible Note,
which totaled approximately $8.4 million at December 31, 1996. Borrowings under
the Convertible Note will continue to be the Company's principal source of
financing until completion of this offering. All or a portion of the Convertible
Note may be repaid using a portion of the net proceeds from the sale of the
Common Stock offered hereby and the Company currently anticipates that it will
use at least $8.0 million for such purpose. At December 31, 1996, the Company's
working capital deficit totaled approximately $8.8 million and cash totaled
approximately $358,000. The Company expects to continue to incur significant
costs in connection with its ongoing research and development activities and
with the establishment of its marketing capabilities.

   The Company's primary uses of cash to date have been in operating 
activities to fund research and development, including clinical trials, and 
general and administrative expenses. As of December 31, 1996, the Company's 
net investment in equipment and leasehold improvements was $2.6 million. The
Company expects that additional equipment and facilities will be needed as it
increases its research and development activities. The Company has no material
commitments for capital expenditures as of December 31, 1996. In connection with
its agreement with a privately owned generic drug manufacturer, see
"Business--Patents and Proprietary Rights," the Company anticipates recognizing
an expense of $3.0 million during the three months ending March 31, 1997. The
Company's obligations under its agreement with such privately owned generic drug
manufacturer, see "Business--Patents and Proprietary Rights," are not expected
to materially affect the Company's liquidity or capital resources.

   Although the Company anticipates that the net proceeds from the sale of 
the Common Stock offered hereby, together with available cash, cash 
equivalents, short-term investments and expected interest income, will be 
sufficient to fund the Company's operations for the next 12 months, the 
Company's future cash requirements will be substantial and will depend on 
many factors, some of which are outside the control of the Company. Such 
factors include the problems, delays, expenses and complications frequently 
encountered by development stage companies; the progress of the Company's 
research, development and clinical trial programs; the costs and timing of 
seeking regulatory approvals of the Company's products under development; the 
Company's ability to obtain such regulatory approvals; the success of the 
Company's sales and marketing programs; costs in filing, prosecuting, 
defending and enforcing any patent claims and other intellectual property 
rights; the extent and terms of any collaborative research, manufacturing, 
marketing, joint venture or other arrangements; and changes in economic, 
regulatory or competitive conditions or the Company's planned business. As a 
result, the Company may need to raise substantial additional capital to fund 
its operations before achieving anticipated positive cash flows from 
operations in 1998, assuming the successful commercialization of NIASPAN. The 
Company expects that it would seek such additional funding through public or 
private equity or debt financings or through collaborations. To the extent 
the Company raises additional capital by issuing equity securities, ownership 
dilution to existing shareholders will result and future investors may be 
granted rights superior to those of existing shareholders. There can be no 
assurance, however, that additional funding will be available on acceptable 
terms, or at all. See "Risk Factors--Future Capital Needs; Uncertainty of 
Additional Funding." 

                               21           
<PAGE>
                                   BUSINESS 

OVERVIEW 

   Kos Pharmaceuticals, Inc. ("Kos", pronounced Kos, or the "Company") is 
engaged primarily in the development of proprietary prescription 
pharmaceutical products for the treatment of certain chronic cardiovascular 
and respiratory diseases. The Company intends to manufacture its products and 
to market such products directly through its own specialty sales force. The 
Company's cardiovascular products under development consist of 
controlled-release, once-a-day, oral dosage formulations. The Company's 
respiratory products under development consist of aerosolized inhalation 
formulations to be used primarily with the Company's proprietary inhalation 
devices. 

   The Company was founded in 1988 by the former Chief Executive Officer, 
Chief Operating Officer and Director of Product Development of Key 
Pharmaceuticals, Inc., which was acquired by Schering-Plough Corporation in 
June 1986. The Company believes that substantial market opportunities exist 
for developing drugs that are reformulations of existing approved 
prescription pharmaceutical products but which offer certain safety 
advantages, such as reduced harmful side effects, or patient compliance 
advantages, such as once-a-day rather than multiple daily dosing regimens, 
over such currently existing products. Kos believes that developing 
proprietary products based on currently approved drugs, rather than new 
chemical entities ("NCEs"), may reduce regulatory and development risks and, 
in addition, facilitate the marketing of such products because physicians are 
generally familiar with the safety and efficacy of such products. Seven of 
the Company's nine products under development require NDA filings with the 
FDA. Although more expensive and time consuming, developing products that 
require NDA approval offers several advantages compared with generic 
products, including potential for higher gross margins, limited competition 
resulting from significant clinical and formulation development challenges, 
and a three-year statutory barrier to generic competition. 

   On May 6, 1996, Kos submitted a NDA to the FDA for NIASPAN, its first 
product under development. NIASPAN is a controlled-release, once-a-day, oral 
formulation of niacin for the treatment of multiple lipid disorders, which 
are primary risk factors for coronary heart disease. 

STRATEGY 

   The Company's objective is to become a fully-integrated specialty 
pharmaceutical company that develops, manufactures, and markets proprietary 
products directly through its own specialty sales force. The Company's 
business strategy includes the following fundamental elements: 

   SELECT PRODUCTS WITH UNREALIZED COMMERCIAL POTENTIAL.--The Company 
   develops products that address unmet medical needs through formulation 
   improvements of existing drugs or distinctive marketing efforts. Kos 
   believes that the safety or patient compliance associated with certain 
   currently marketed drugs can be improved, thus providing substantial 
   market opportunities with the successful development of proprietary 
   formulations. In addition, Kos believes that substantial market 
   opportunities exist that can be addressed by marketing its products 
   through a direct sales force that can focus on specialist physicians and 
   provide those physicians with scientific information regarding the 
   therapeutic benefits of the Company's products. 

   FOCUS INITIALLY ON THE CARDIOVASCULAR AND RESPIRATORY MARKETS.--Kos has 
   initially concentrated its product development efforts on the 
   cardiovascular and respiratory markets because they are large and growing 
   rapidly and include many chronic diseases requiring long-term therapy. 
   Management believes that as a result of physician prescribing patterns in 
   these markets, a relatively small, direct sales force can effectively 
   market its products. The Company's management team has substantial 
   experience in identifying product opportunities and marketing products in 
   these two therapeutic categories. 

                               22           
<PAGE>
   DEVELOP PROPRIETARY FORMULATIONS OF CURRENTLY APPROVED PHARMACEUTICAL 
   COMPOUNDS.--Kos believes that by developing proprietary products based on 
   currently approved drugs, rather than NCEs, the Company can reduce 
   regulatory and development risks and shorten the product development 
   cycle. Further, developing products that require NDA approval offers 
   several advantages compared with generic products, including the potential 
   for higher gross margins, limited competition resulting from significant 
   clinical and formulation development challenges, and a three-year 
   statutory barrier to generic competition. The Company's management and 
   scientific personnel have significant experience in formulation technology 
   using controlled-release and aerosolized delivery methods. 

   MANAGE CLINICAL DEVELOPMENT.--The Company managed the extensive clinical 
   trials for NIASPAN, and Kos intends to continue to manage directly the 
   clinical development of future products. The Company believes that its 
   commitment to this process ensures the quality of clinical development, 
   allows the Company to better coordinate the regulatory objectives of 
   clinical trials and maximizes the marketing utility of such trials. 

   MANUFACTURE PRODUCTS INTERNALLY.--In order to maximize the quality of 
   developed products, assure compliance with regulatory requirements, and 
   minimize costs, the Company currently intends to manufacture internally 
   all of its solid-dose (i.e., tablet) and aerosol products. Moreover, the 
   Company believes that certain manufacturing challenges associated with 
   aerosol formulations present a barrier to entry in the aerosol 
   pharmaceutical market. The Company's management has substantial experience 
   in manufacturing solid dose and aerosol products. Kos estimates that it 
   has sufficient capacity, with limited additional capital expenditures, to 
   accommodate sales volume for such products through the year 2000. 

   MARKET DIRECTLY THROUGH A SPECIALTY SALES FORCE.--The Company intends to 
   market its products through a direct sales force focused on providing 
   education-oriented product information to selected specialist physicians. 
   Kos intends to market all but one of its planned products in North America 
   through its direct sales force. In areas outside of North America, Kos 
   intends initially to market certain of its products through licensing 
   arrangements with third parties, although it may establish direct sales 
   and marketing capabilities in selected areas. 

   LEVERAGE CORE COMPETENCIES THROUGH ALLIANCES WITH CORPORATE AND RESEARCH 
   PARTNERS.--The Company intends to expand its product portfolio by 
   in-licensing existing products or technologies or entering into other 
   development collaborations with third parties. Kos is currently developing 
   three once-a-day cardiovascular products with Fuisz, using its proprietary 
   microsphere formulation technology. Additionally, the Company is 
   sponsoring basic research at Boston University and Tufts University and 
   intends to enter into corporate alliances to develop products identified 
   through these research programs. The Company intends to enter into 
   additional research alliances in the future. To date, the Company has not 
   identified any additional licensing or development partners or any 
   additional research partners. 

                               23           
<PAGE>
PRODUCTS UNDER DEVELOPMENT 

   Seven of the Company's nine products under development require NDA 
filings. Although NDA approvals are generally associated with products 
consisting of NCEs, which require extensive preclinical studies and clinical 
trials, the Company's products under development consist of new formulations 
of existing drugs. For products currently under development, the Company 
typically will be required to perform Phase I clinical pharmacology and Phase 
III safety and efficacy pivotal trials; limited preclinical toxicology 
studies will also be required on some products. Compared with the development 
of NCEs, the Company believes that its product development strategy generally 
reduces regulatory risks and development costs and shortens overall 
development time. In order to take advantage of certain market opportunities, 
the Company is developing two products that require ANDA filings. The Company 
has retained worldwide marketing rights for all of the products set forth in 
the table below. 

                          PRODUCTS UNDER DEVELOPMENT 
<TABLE>
<CAPTION>

                    PRODUCT DESCRIPTION AND             REGULATORY             DEVELOPMENT 
  PRODUCT           THERAPEUTIC APPLICATION               FILING                  STATUS 
  -------           -----------------------             ----------             -----------
<S>                 <C>                                 <C>         <C>
  CARDIOVASCULAR 
   Niaspan/             Niacin for lipid altering           NDA           NDA submitted May 1996 
   registered 
   trademark/ 

   Combination         Combination of two currently         NDA           Formulation; clinical 
    Product((1))    approved drugs for lipid altering                    pharmacology expected to 
                                                                             commence in 1997 

   Isosorbide-5-           Nitrate for angina               ANDA        Clinical pharmacology commenced 
    Mononi-                                                                 in November 1996 
    trate((1)) 

   Captopril((1))     ACE inhibitor for hypertension        NDA           Formulation; clinical 
                                                                         pharmacology expected to 
                                                                             commence in 1997 
  RESPIRATORY (METERED-DOSE INHALERS) 

   Albuterol             Beta-agonist for asthma           ANDA         Clinical validation study 
     (CFC)                                                                 completed; clinical 
                                                                          pharmacology commenced 
                                                                             in January 1997 

   Triamcino-          Inhaled steroid for asthma          NDA           Formulation; clinical 
   lone((2))                                                             pharmacology expected to 
     (non-CFC)                                                               commence in 1997 

   Flunisolide((2))     Inhaled steroid for asthma          NDA           Formulation; clinical 
     (non-CFC)                                                           pharmacology expected to 
                                                                             commence in 1997 

   Albuterol((2))        Beta-agonist for asthma            NDA           Formulation; clinical 
     (non-CFC)                                                           pharmacology expected to 
                                                                             commence in 1998 

   Confidential        Unnamed compound with novel          NDA           Formulation; clinical 
    Product((3))      device for treating asthma for                      pharmacology expected 
      (non-CFC)        the pediatric and geriatric                         to commence in 1998 
                                 markets 
</TABLE>
   (1) Being developed in collaboration with Fuisz. See "--Collaboration with
       Fuisz Technologies Ltd." 
   (2) Utilizing the Company's proprietary breath coordinated inhaler,
       currently under development. 
   (3) Utilizing the Company's proprietary breath actuated inhaler, currently
       under development. 

                               24           
<PAGE>
CARDIOVASCULAR PRODUCTS 

   The Company is developing once-a-day, controlled-release prescription 
products for the treatment of lipid disorders, ischemic heart disease 
(including angina), and hypertension. In 1995, such disease segments of the 
cardiovascular market achieved aggregate sales in the United States of 
approximately $10.2 billion. 

NIASPAN 

   SUMMARY. NIASPAN is a once-a-day, oral, solid-dose, controlled-release 
formulation of niacin for the treatment of multiple lipid disorders, a 
condition typically associated with elevated cholesterol involving multiple 
lipids that are primary risk factors for coronary heart disease ("CHD"). On 
May 6, 1996, the Company submitted a NDA to the FDA for NIASPAN. If NIASPAN 
is approved, the Company believes it will be the only once-a-day, 
controlled-release niacin product approved by the FDA for the treatment of 
multiple lipid disorders. The Company has conducted three double-blinded, 
placebo-controlled clinical trials in which NIASPAN produced statistically 
and clinically significant changes in several lipid components without 
generating treatment-related serious adverse events. Moreover, in a two-year 
safety study, less than 1% of patients discontinued use of NIASPAN because of 
clinically significant elevations in liver enzyme levels. 

   LIPID-ALTERING MARKET.--Clinical research since the mid-1980's has 
determined that an elevated level of LDL cholesterol, a condition referred to 
as hyperlipidemia, is a critical atherogenic risk factor for CHD. 
Hyperlipidemia is a lipid metabolism disorder that results in excess lipids 
in the blood, which can block arteries and create adverse coronary events, 
such as CHD and myocardial infarction. In addition to elevated LDL 
cholesterol ("bad" cholesterol), low levels of HDL cholesterol ("good" 
cholesterol) and high levels of triglycerides are risk factors for CHD 
according to the National Institutes of Health ("NIH") and the American Heart 
Association ("AHA"). HDL cholesterol is considered to be protective against 
CHD because it removes harmful cholesterol from blood vessels and peripheral 
tissues. Moreover, recent research has indicated that an elevated level of 
lipoprotein (a) ("Lp(a)"), an LDL-like cholesterol component, may be as 
important an independent risk factor for CHD as elevated total cholesterol. 
As a result of the increased awareness and the prevalence of multiple lipid 
disorders, lipid-altering drugs have emerged as one of the largest and 
fastest growing pharmaceutical product segments. In 1995, the market for 
cholesterol-reducing drugs exceeded $2 billion in the United States and $5 
billion worldwide. 

   While the risks of multiple lipid disorders are becoming well recognized, the
condition remains significantly untreated worldwide. To address this large unmet
medical need, the NIH convened a panel of cholesterol research experts, the
National Cholesterol Education Program ("NCEP"), to establish recommended
cholesterol levels, principally total and LDL cholesterol, and to establish
other risk factors for CHD. Based on extensive research conducted during the
last 20 years, the NCEP established guidelines consisting of recommended lipid
goals and intervention criteria, such as diet and drug therapies, for reducing
the risk of heart disease and heart attack. According to the guidelines, an
estimated 52 million people in the United States have levels of LDL cholesterol
that exceed the levels recommended by the NCEP and, approximately 13 million of
these persons would require both diet and drug therapies to achieve adequate
reduction in cholesterol levels. The Company estimates that approximately half
of these 13 million people have one or more other lipid components that are
outside the levels recommended by the NIH and the AHA. Additionally, it is
estimated that as many as 30% of the 11 million patients in the United States
with confirmed CHD do not have elevated LDL cholesterol but do have clinically
deficient HDL cholesterol levels. Further, an elevated level of Lp(a) is
estimated to be present in 20% of the U.S. adult population. The Company
believes that the market for lipid-altering drugs should grow as awareness and
diagnosis of lipids, particularly those other than LDL cholesterol, continue to
increase.


   When diet and exercise fail to adequately control cholesterol levels, 
physicians typically prescribe lipid-altering medications. Physicians can 
choose from the following four classes of medications when 

                               25           
<PAGE>
attempting to alter lipid levels: HMG CoA reductase inhibitors, or "statins" 
(e.g., lovastatin); fibric acid derivatives (e.g., gemfibrozil); bile-acid 
sequestrants (e.g., cholestyramine); and niacin. The statins are the most 
widely prescribed lipid-altering medication, accounting for nearly $2 billion 
in U.S sales in 1995 and 72% of the 35 million prescriptions for 
lipid-altering medication in the United States in 1995. Generally, the 
statins are highly effective in lowering total and LDL cholesterol but have 
limited impact in raising HDL cholesterol or in substantially reducing 
triglycerides. Gemfibrozil, the major fibric acid derivative in the U.S., 
accounted for approximately 20% of total lipid-altering prescriptions in 
1995. Gemfibrozil is most commonly prescribed to reduce triglycerides and has 
limited efficacy on total, LDL and HDL cholesterol. The remaining product 
categories, including bile-acid sequestrants and existing preparations of 
niacin, represented approximately 8% of U.S. lipid-altering prescriptions in 
1995. 

   OVERVIEW OF NIACIN. Niacin is a water-soluble vitamin that has long been 
recognized as an effective pharmacologic agent for the treatment of multiple 
lipid disorders, including elevated LDL and low HDL cholesterol. In numerous 
independent studies performed during the past 30 years, niacin has proven 
effective in reducing total cholesterol, LDL cholesterol and triglycerides, 
as well as in increasing HDL cholesterol. Additional clinical studies have 
indicated that long-term treatment with niacin reduces morbidity and 
mortality in patients with CHD. The NIH recommends niacin as first-line drug 
therapy because of its low cost and its efficacy in altering multiple lipid 
components. 

   Although niacin has demonstrated favorable efficacy on most major lipid 
components, adverse side effects associated with currently available 
preparations of niacin have prevented it from becoming widely used to treat 
hyperlipidemia. Immediate-release ("IR") preparations of niacin generally are 
administered three times daily and can cause multiple flushing episodes, 
characterized primarily by facial redness and tingling, often accompanied by 
rash. Because at least two IR niacin doses are usually taken during the 
daytime, frequent flushing episodes are often embarrassing as well as 
uncomfortable. Consequently, in many patients, these flushing episodes, 
particularly in the daytime, result in non-compliance with the recommended 
dosing regimen for the product or complete discontinuation of its use. In 
order to remedy the side effects associated with IR niacin, several 
manufacturers have developed sustained-release ("SR") preparations of niacin, 
typically administered twice a day. Such SR preparations have not been 
approved by the FDA for treatment of lipid disorders, and their 
administration frequently has been associated with a high incidence of liver 
toxicity. Consequently, despite its broad favorable effect on multiple lipids 
and its position as the NIH's recommended first-line drug therapy for 
treatment of hyperlipidemia, U.S. drug store sales of niacin were 
approximately $14 million in 1995. The Company believes that a significant 
opportunity exists to expand the market for niacin with an improved 
formulation that maintains the compound's favorable efficacy profile while 
reducing adverse events. 

   NIASPAN PRODUCT DEVELOPMENT.--Kos has developed a controlled-release 
hydrogel matrix formulation of niacin that reduces the intolerable side 
effects and frequent safety problems characteristic of currently available 
niacin formulations. Kos believes that it is the unique controlled-release 
nature of its NIASPAN formulation in conjunction with NIASPAN's specific 
dosing regimen that minimizes adverse events while maintaining niacin's 
positive effect on lipids. Kos also believes the recommended dosing regimen 
for NIASPAN contributes to the positive effects on lipid levels because of 
the chronobiology of lipid metabolism. 

                               26           
<PAGE>
   Although niacin's efficacy on multiple lipid components has been well 
documented for many years, relatively little has been published about 
niacin's mechanism of action, its complete metabolic profile, or other 
elements of its pharmacology. As a result, the Company's clinical development 
of NIASPAN has included extensive pharmacokinetics research, including 14 
studies involving 350 healthy volunteers, as well as two pilot studies, three 
pivotal trials, and a long-term open label safety study. The Company's 
clinical development program, which has studied the effects of NIASPAN in 
1,212 persons, is summarized in the table below. 

                     NIASPAN CLINICAL DEVELOPMENT PROGRAM 

<TABLE>
<CAPTION>
                                                 NIASPAN        DOSING         STATUS 
                                                SUBJECTS        PERIOD 
                                                --------     ------------    ---------
<S>                                                 <C>      <C>             <C>
  14 PHARMACOKINETIC STUDIES                        350      Up to 3 wks.    Completed 

  2 PILOT STUDIES                                    39         2 mos.       Completed 

  DOUBLE-BLINDED PLACEBO 
   CONTROLLED PIVOTAL TRIALS: 

    NIASPAN 1,500 mg                                 76         4 mos.       Completed 

    NIASPAN 1,000 mg and 2,000 mg                    82         4 mos.       Completed 

    NIASPAN dose escalation to 3,000 mg              87         6 mos.       Completed 

  LONG-TERM OPEN LABEL SAFETY STUDY                 728        22 mos.       Ongoing 

  Memo: 

   SUBJECTS INCLUDED IN NDA                         633 

   TOTAL NIASPAN SUBJECTS                         1,212 
</TABLE>

   In a total of six clinical trials conducted at 17 lipid research centers 
in the United States, NIASPAN has been evaluated in 633 patients with 
confirmed diagnoses of hyperlipidemia. Three of these clinical trials were 
double-blinded, placebo-controlled pivotal trials. In each of these studies 
involving males and females ages 21 to 75, subjects were evaluated for the 
percentage change from baseline in LDL cholesterol, HDL cholesterol, total 
cholesterol, triglycerides, apolipoprotein B, Lp(a) and apolipoprotein A-1. 
Safety endpoints included objective measurements such as liver enzyme levels 
and levels of fasting glucose and uric acid as well as subjective endpoints, 
such as flushing and symptoms of gastrointestinal distress. Additionally, the 
Company is conducting a 22-month, open label safety study, in approximately 
728 patients, of which 133 patients had completed the study before May 1996. 
The results from these 133 patients were included in the Company's NDA 
submission for NIASPAN. This trial included a subset of patients dosed 
concomitantly with NIASPAN and a statin or bile-acid sequestrant. 

   No clinically significant serious adverse safety trends arose during the 
clinical trials of NIASPAN. Of all patients treated with NIASPAN in the 
pivotal and long-term safety trials, only four patients with normal liver 
function tests at baseline showed clinically significant elevations in liver 
function tests (defined as elevations greater than three times the upper 
limit of normal) during treatment with NIASPAN and only two patients treated 
with NIASPAN discontinued the drug because of elevations in liver function 
tests. Treatment with NIASPAN revealed no significant differences compared 
with placebo in the incidence of subjective adverse events with the exception 
of flushing and rash. The Company believes that such flushing episodes will 
be acceptable to most patients when they do occur due to the combination of 
NIASPAN's formulation, its dosing regimen, and proper dose titration. See "--
Cardiovascular Products--NIASPAN--Marketing Strategy for NIASPAN." 

                               27           
<PAGE>
   The following table sets forth results with respect to principal efficacy 
endpoints of the Company's three double-blinded, placebo-controlled pivotal 
trials and the one open label long-term safety study of NIASPAN. In these 
studies, NIASPAN consistently showed clinically and statistically significant 
changes (p/less than/0.001 compared with baseline) in all of the major lipids 
measured, including those considered to be most important in the development 
of CHD. 

                     NIASPAN LIPID-ALTERING PROFILE((1)) 

                                                     PERCENTAGE CHANGE 
                                                       FROM BASELINE(2) 
                                                    --------------------
     Total Cholesterol                              Decreased 11% to 12% 
     LDL Cholesterol                                Decreased 14% to 19% 
     HDL Cholesterol                                Increased 22% to 29% 
     Triglycerides                                  Decreased 25% to 35% 
     Lp(a)                                          Decreased 24% to 29% 
- -------------------
    (1) Intent-to-Treat Population at 2,000 mg Once-a-Day. 
    (2) Statistically significant for all indicated lipids at
        p/less than/0.001. 

   Based on the results of the three double-blinded, placebo-controlled 
clinical trials and the long-term safety study, Kos has filed a NDA seeking 
approval for NIASPAN for the treatment of elevated total and LDL cholesterol 
and elevated serum triglycerides, consistent with the FDA's standard labeling 
for niacin when used as a lipid-altering agent (rather than as a nutritional 
supplement). Kos believes that its clinical trial data will support the 
approval of such standard labeling for NIASPAN. The Company also is seeking 
approval as concomitant therapy with statins and bile-acid sequestrants to 
decrease total and LDL cholesterol. 

   In the clinical trials performed by the Company, NIASPAN was shown to 
decrease total and LDL cholesterol levels less than reported by statin 
manufacturers in the 1996 Physician's Desk Reference (the "PDR"). These data 
also indicate, however, that the statins are less effective than NIASPAN in 
raising HDL cholesterol and lowering triglycerides. Numerous independent 
clinical studies evaluating the effects of statins on Lp(a) indicate that the 
statins have little or no effect on reducing Lp(a), whereas NIASPAN 
significantly reduces Lp(a). 

   MARKETING STRATEGY FOR NIASPAN. The Company intends to market NIASPAN 
directly to the specialist physicians within the cardiovascular market who 
are among the leading prescribers of lipid-altering medications. 
Specifically, the Company believes there are approximately 16,000 specialist 
physicians, consisting primarily of cardiologists and internists, who account 
for approximately 40% of the total prescriptions for lipid-altering 
medications in the United States in 1995. The Company's initial sales force 
is expected to consist of approximately 70 field representatives and managed 
care specialists to be trained in explaining the features and benefits of 
NIASPAN ("detailing") prior to its expected launch in 1997. Kos estimates 
that it will be able to detail each of these physicians up to six times a 
year with such a sales force. Kos believes that the significant prior 
experience of members of its management team in recruiting and managing 
specialty sales forces in this market, aided by favorable hiring conditions 
in the pharmaceutical industry, will allow the Company to have its sales 
force in place within the projected time frame. Within a year following 
NIASPAN's launch, Kos expects to expand its direct sales force and possibly 
to supplement it with a contract sales force that will detail selected 
additional specialist physicians not addressed by the Company's specialty 
sales force. Although the Company does not expect to hire its field sales 
force before it receives an indication of the approvability of NIASPAN from 
the FDA, it is possible that formal approval of NIASPAN could be delayed, 
thus requiring the Company to pay the salaries of such personnel during any 
such delay. Following the launch of NIASPAN in the United States, the Company 
plans to license marketing rights to an established marketing partner in 
major international markets. 

                               28           
<PAGE>
   If approved by the FDA, the marketing of NIASPAN will focus on the NIH and 
AHA recommendation that niacin be used as first-line drug therapy for the 
treatment of hyperlipidemia. Additionally, the Company intends to inform the 
specialist physicians as to the manner in which NIASPAN achieves its safety 
and efficacy profile. This marketing program will be implemented through 
direct visits with selected physicians, medical journal reprints, seminars, 
and clinical discussion groups. The Company also intends to educate patients 
on the benefits and proper use of NIASPAN through brochures and product 
sample "starter packs" to encourage proper dose titration. Information 
delivered by the Company to physicians and patients will include a discussion 
about the flushing side effects of NIASPAN, including the importance of 
proper dose titration and adherence to the prescribed dosing regimen to 
reduce this side effect. Although most patients taking NIASPAN will flush 
occasionally, the Company believes that the combination of NIASPAN's 
formulation, its dosing regimen, and proper dose titration should result in 
an incidence of flushing episodes that are tolerable for most patients. 
NIASPAN's dosing regimen provides for the drug to be taken once-a-day at 
night; therefore, any flushing episodes will normally occur while the patient 
is sleeping. The Company believes that flushing during the night will not 
cause the discomfort or embarrassment that often accompanies the multiple 
daytime flushing episodes that occur with IR niacin. 

   The Company expects that NIASPAN will be priced below the statins and 
competitively with gemfibrozil, while retaining the gross margins typically 
associated with NDA products. The Company believes that NIASPAN's relatively 
low anticipated selling price combined with its favorable effects on multiple 
lipid components also should make it attractive to the managed care market. 
The Company plans to include a number of managed care sales specialists 
within its sales force to address this market segment. 

LIPID-ALTERING COMBINATION PRODUCT 

   In addition to NIASPAN, Kos is developing a product that consists of a 
combination of two currently approved drugs for the treatment of multiple 
lipid disorders. The combination product will require a NDA. The Company 
believes that a once-a-day tablet combining the complementary properties of 
its combination product represents an effective modality for treating 
patients with multiple lipid disorders. The Company also believes that this 
once-a-day product should offer significant improvements in patient 
compliance compared with taking each product independently under their 
recommended dosing regimens. The potential market for the combination product 
consists of patients with multiple lipid disorders, including high total and 
LDL cholesterol, high triglycerides or low HDL cholesterol. 

   The product is currently in the formulation development stage, and the 
Company expects that clinical pharmacology trials will commence in 1997. By 
or near the time of completion of the development of the combination product, 
the patent for the one currently patented component compound will have 
expired, which will enable the Company to market its combination product 
following FDA approval. Although it is expected that generic versions of the 
individual components will be marketed following patent expiration, the 
Company believes that the positive effects of the combination product on 
multiple lipid components and the convenience associated with taking one 
tablet, once-a-day should support a price premium compared with any generic 
versions of the individual drugs. 

   The combination product will be marketed by the same Kos specialty sales 
force that will market NIASPAN and to essentially the same group of 
physicians. 

ISOSORBIDE-5-MONONITRATE 

   Kos is developing a once-a-day, controlled-release, oral, generic version 
of IS-5-MN for the prophylactic treatment of angina pectoris. This product, 
which will be a branded generic requiring an ANDA filing, is being developed 
in order to provide Kos with a near-term product for the angina market and to 
expand its cardiovascular product line. A formulation of IS-5-MN has been 
developed 

                               29           
<PAGE>
and the Company began a clinical pharmacology study during November 1996. The 
Company intends to leverage its specialty sales force by having its sales 
representatives market IS-5-MN during physician office visits while detailing 
NIASPAN. 

   Angina pectoris is a cardiovascular related disorder that is characterized 
by thoracic pain and a feeling of suffocation, most often due to anoxia (lack 
of oxygen supply) to the myocardium precipitated by physical exertion or 
excitement. The treatment of angina pectoris includes several classes of 
therapeutic compounds including nitrates, beta-blockers, and calcium channel 
blockers. The beta-blockers and calcium channel blockers, as well as certain 
forms of nitrates, are long-acting preparations most commonly prescribed for 
prophylaxis of chronic angina pectoris. In 1995, U.S. sales of nitrate 
products approximated $580 million. The only currently marketed once-a-day 
mononitrate is the fastest growing product within the nitrate segment; U.S. 
sales of this product grew by 260% in 1995 from 1994. Kos is aware of two 
other companies that are developing a once-a-day formulation of IS-5-MN. 

CAPTOPRIL 

   The Company is also developing a once-a-day, controlled-release captopril, 
an ACE inhibitor for the treatment of hypertension for which a NDA is 
required. At present, captopril is dosed as an IR tablet to be taken two or 
three times daily. The U.S. patent on the branded product expired in the 
first quarter of 1996 and there currently exist many generic forms of this 
immediate-release product. The Company believes that its controlled-release, 
once-a-day formulation of captopril will provide a competitive advantage 
compared with the generic versions of IR captopril and this advantage will 
support a modest price premium compared with generics. Captopril is currently 
in the formulation development stage and the Company expects that clinical 
pharmacology trials will commence in 1997. 

   Hypertension is a major health care problem in the United States that 
accounted for almost half of all cardiovascular related physician visits in 
1995. In 1995, U.S. sales of products addressing the antihypertensive disease 
segment were estimated to be in excess of $5.6 billion. ACE inhibitors 
constituted the second largest class of products of the antihypertensive 
market, after calcium channel blockers, generating approximately $2.7 billion 
in sales in the United States in 1995. In its existing two-to-three times a 
day dosage forms, sales of captopril in the United States were approximately 
$520 million in 1995, although 1996 sales have been trending lower because of 
generic competition. Captopril accounted for approximately 13% of the 65 
million prescriptions for ACE inhibitors in the United States in 1995. Kos is 
aware of one other company that is developing a once-a-day formulation of 
captopril. 

RESPIRATORY PRODUCTS 

   The Company is developing five aerosolized inhalation pharmaceutical 
products, dispensed in MDI devices, for the treatment of asthma. The 
Company's management has substantial experience in formulating, 
manufacturing, and marketing aerosolized products. 

MARKET OVERVIEW 

   The respiratory market consists of the asthma and allergy segments. In 
1995, the market for respiratory prescription drugs was $3.2 billion in the 
United States, of which the market for asthma products was $2.4 billion. 
Asthma is a complex respiratory disorder that results in troubled breathing 
due to inflammation and constriction of the bronchial airways, caused by 
factors including allergens, such as dust and pollen, or vigorous exercise. 
Asthma is principally treated by two classes of therapeutic compounds, 
bronchodilators and anti-inflammatory agents. Bronchodilators, which are used 
to open constricted airways during asthma, include beta-agonists (e.g., 
albuterol), xanthines (e.g., theophylline) and anti-cholinergics (e.g., 
ipratropium). Anti-inflammatories, which include cromolyns (e.g., cromolyn 
sodium) and corticosteroids (e.g., triamcinolone, beclomethasone, and 
flunisolide) are used to diminish inflammation causing the asthma. Each of 
these therapeutic compounds, except xanthines, is delivered primarily through 
MDI devices. Drug delivery through such MDI devices is believed to be the 
fastest 

                               30           
<PAGE>
growing form of drug delivery in the asthma market. Kos has focused on this 
mode of delivery for the asthma market because of its efficacy and because of 
management's experience with formulating and marketing aerosolized inhalation 
products. 

   Currently, most MDI products use CFC propellants. Although, due to 
environmental concerns, the use of CFC propellants has been banned or 
severely restricted for most worldwide commercial uses, CFC's are still 
permitted in limited amounts for MDI pharmaceutical products under an 
"essential use" exemption available under the Montreal Protocol on Substances 
that Deplete the Ozone Layer. It is expected, however, that such "essential 
use" exemptions will grow more limited and will eventually expire. In 
anticipation of these future restrictions, all of the Company's proposed MDI 
products, with the exception of albuterol (CFC), are being developed with 
environmentally safe non-CFC propellants. See "Government Regulations." 

ALBUTEROL (CFC) 

   The Company is developing a generic version of albuterol (CFC) to be 
dispensed in a generic MDI. The Company has commenced scale-up and completed 
manufacture of clinical supplies of albuterol (CFC). It has recently 
completed a human clinical validation study and a pivotal clinical 
pharmacology trial commenced in January, 1997. The Company expects that it 
will submit an ANDA for its albuterol (CFC) in 1997. Kos intends to 
distribute albuterol (CFC) through a generic distributor. Although the 
Company's long-term strategy is to market its own branded proprietary aerosol 
products using non-CFC propellants, albuterol (CFC) will provide the Company 
with limited near-term revenue opportunities. Moreover, albuterol (CFC) will 
enable the Company to demonstrate its aerosol formulation and manufacturing 
capabilities earlier than would be possible with a non-CFC product. The 
Company believes that such demonstrated aerosol capabilities might provide it 
with opportunities to cross-license products or collaborate with other 
pharmaceutical companies, especially outside the United States, that lack MDI 
capabilities but that might desire such products. The Company has not had 
discussions with any third parties regarding any possible licensing 
arrangements. 

   Albuterol is the most widely used MDI product approved for the treatment 
of asthma, accounting for nearly $680 million in sales and 26 million 
prescriptions in the United States in 1995, although 1996 sales have been 
trending lower because of generic competition. Kos anticipates a relatively 
limited number of generic competitors for generic albuterol because of the 
manufacturing challenges and the high capital costs of entering the aerosol 
pharmaceutical business. 

TRIAMCINOLONE (NON-CFC) WITH BREATH COORDINATED INHALER ("BCI") 

   Kos is developing a proprietary non-CFC formulation of triamcinolone to be 
used with the Company's proprietary breath coordinated inhaler ("BCI"). This 
product will require the submission of a NDA. The Company believes that its 
BCI may improve the coordination of inhalation with actuation of medication, 
thereby offering possible benefits in patient compliance and uniform dose 
administration. Triamcinolone is a corticosteroid that is used to treat the 
underlying inflammation of asthma. Triamcinolone is currently in the 
formulation development stage and the Company expects clinical pharmacology 
trials to commence in 1997. 

   Inhaled steroids are being widely prescribed because their efficacy for 
prophylactic treatment is greater than that of other asthma products that can 
be delivered through MDIs. Triamcinolone, marketed by only one U.S. producer, 
is the largest selling of the metered-dose inhaled steroids. U.S. sales of 
inhaled steroids were approximately $450 million in 1995, of which 
triamcinolone accounted for $199 million. 

FLUNISOLIDE (NON-CFC) WITH BCI 

   Kos is developing a non-CFC proprietary formulation of flunisolide to be 
used with its BCI. Flunisolide is a long-acting inhaled steroid for the 
treatment of asthma. The Kos formulation of 

                               31           
<PAGE>
flunisolide, for which a NDA is required, is currently in development, and 
the Company expects clinical pharmacology trials to commence in 1997. 
Flunisolide, also marketed by only one U.S. producer, is the fastest growing 
inhaled steroid, with U.S. sales of approximately $120 million in 1995, 
representing an increase of 40% from 1994. 

OTHER MDI AND DEVICE PRODUCTS 

   Kos is developing a non-CFC albuterol to address environmental regulations 
ultimately that will require manufacturers to phase out the CFC-based MDIs, 
including the Company's generic albuterol (CFC) product. Kos is also 
developing a second proprietary MDI device, a breath actuated inhaler 
("BAI"). The Company's BAI operates automatically and is being developed 
principally to address the difficulties in taking inhaled medication often 
faced by children and the elderly. The Company intends to develop the BAI 
with one of its non-CFC formulations. Clinical pharmacology trials with the 
BAI are expected to commence in 1998. The Company also is developing a 
proprietary inhalation dose counter designed to indicate when sufficient 
doses no longer remain in the aerosol canister, thereby alerting the patient 
to obtain a "refill" prescription. At present, the Company intends to use the 
inhalation dose counter on all of its inhalation products with the exception 
of albuterol (CFC). 

COLLABORATION WITH FUISZ TECHNOLOGIES LTD. 

   The Company has entered into certain agreements with Fuisz, a company 
engaged in the development and commercialization of drug delivery and food 
applications. Pursuant to these agreements, the Company will collaborate with 
Fuisz in the development of up to six products principally using Fuisz' 
proprietary microsphere formulation technology. Captopril, the combination 
product and IS-5-MN are currently being developed pursuant to this 
collaboration with Fuisz. Fuisz also committed to collaborate on the 
development of up to three other products; one of these products may be 
subject to a joint venture arrangement. Kos believes that Fuisz' proprietary 
microsphere technology is uniquely well-suited to overcome the particular 
formulation challenges associated with the Company's combination product and 
with captopril. 

   Under the terms of such agreements, Fuisz is responsible for formulating 
each product and Kos is responsible for the remainder of the development 
program. The first milestone of Fuisz' formulation work will permit Kos to 
file Investigational New Drug ("IND") applications with the FDA for 
subsequent pharmacokinetics and clinical studies on the products. Except for 
the possible joint venture project, Kos has exclusive rights to manufacture 
the formulated products and Kos retains exclusive worldwide marketing rights 
upon exercising its existing option rights. On those products, Kos will pay 
the development costs and pay license and development fees based on milestone 
achievement. In addition, the Company will pay royalties to Fuisz based on 
product sales by Kos. 

SPONSORED RESEARCH 

BOSTON UNIVERSITY 

   Kos is sponsoring basic research at Boston University focused on the role 
of apolipoproteins in cardiovascular and Alzheimer's diseases. The objective 
of the research program is to identify molecular agents involved so that 
pharmaceutical products can be developed for the cardiovascular and 
Alzheimer's indications. Two patents have been filed related to this 
research, one of which is owned by Boston University and licensed to the 
Company and one of which is jointly owned by Boston University and Kos. 
Although no products have yet been identified for development as a result of 
this research, the Company would pay royalties upon the sale of such 
products. The research is being led by Vassilis Zannis, Ph.D., Professor and 
Director of the Section of Molecular Genetics of the Cardiovascular Institute 
at Boston University Medical Center. Dr. Zannis is recognized as a leading 
expert in the research of apolipoproteins. 

                               32           
<PAGE>
TUFTS UNIVERSITY 

   Since 1988, Kos has also been sponsoring research at Tufts University aimed
at identifying and characterizing the pathophysiological significance of mast
cell degranulation and mast cell-derived mediators in such diseases as migraine,
irritable bowel syndrome, interstitial cystitis, multiple sclerosis, and
urticaria. This research has generated one issued U.S. patent, licensed to Kos,
covering the use of inhibitors of mast cell degranulation for the treatment of
migraines, as well as five other patent applications claiming other therapeutic
areas. Although no products have yet been identified for development as a result
of this research, the Company would pay royalties upon the sale of such
products. This research is being led by T.C. Theoharides, PhD., M.D., Professor
of Pharmacology and Medicine at Tufts University School of Medicine and is being
conducted at Tufts and the New England Medical Center.

   The Company's sponsorship of both research programs currently aggregates 
approximately $500,000 annually. Kos intends to seek additional industry 
development partners as research and development efforts increase. Kos has 
exclusive worldwide rights to all compounds related to the research conducted 
at both universities. 

LICENSING AND OTHER ACTIVITIES 

   The Company intends to pursue collaborative opportunities, including 
licensing the use of selected products and technologies from third parties 
("in-licensing"); acquisition of complementary technologies, products or 
companies; product co-marketing arrangements; joint ventures; and strategic 
alliances. The Company believes that attractive collaborative opportunities 
exist in which Kos may be able to leverage its competencies through such 
potential alliances in order to increase revenue potential for the Company. 
See "Use of Proceeds." 

   Many existing pharmaceutical products, or products currently under 
development, may be suitable candidates for specialty promotional or 
co-marketing campaigns. Kos intends to actively attempt to identify 
licensing, co-marketing and product acquisition opportunities that can 
complement the Company's future product portfolio. In addition, in situations 
where third-party drug delivery technologies are complementary to the 
Company's drug development formulation capabilities, the Company may pursue 
licensing rights for such technology. The Company may also consider licensing 
certain of its products and technologies to third parties ("out-licensing"). 

   Kos intends to explore strategic development and marketing alliances with 
one or more large pharmaceutical companies to pursue new chemical entities 
that may emerge from the Company's sponsored research programs. 

PATENTS AND PROPRIETARY RIGHTS 

   The Company actively seeks, when appropriate and available, protection for 
its products and proprietary information by means of United States and 
foreign patents, trademarks, trade secrets and contractual arrangements. 
Patent protection in the pharmaceutical field, however, can involve complex 
legal and factual issues. Moreover, broad patent protection for new 
formulations or new methods of use of existing chemical entities is sometimes 
difficult to obtain and often of limited usefulness, primarily because the 
active ingredient and many of the formulation techniques have been known for 
some time. Consequently, some patents claiming new formulations or new 
methods of use for old drugs may not provide meaningful protection against 
competition. Nevertheless, the Company intends to seek patent protection when 
appropriate and available and otherwise to rely on regulatory-related 
exclusivity and trade secrets to protect certain of its products, 
technologies and other scientific information. There can be no assurance, 
however, that any steps taken to protect such proprietary information will be 
effective. 

   The Company has a patent application pending in the PTO with claims 
covering NIASPAN'S method of use consistent with its recommended once-a-day 
dosing regimen. Certain of these claims have recently been held allowable but 
have not yet been issued as a patent by the PTO. The patent examiner 

                               33           
<PAGE>
has, however, suspended prosection of the Kos application and referred such 
application to the PTO's Board of Interference to determine whether an 
interference should be declared between such Kos application and a 
method-of-use patent issued to a privately owned generic manufacturer 
allegedly claiming the same dosing regimen invention. 

   On February 7, 1997, the Company and such generic manufacturer entered 
into an agreement pursuant to which the parties agreed to resolve, as between 
themselves, the effects of such potential interference by granting each other 
licenses under their respective patent application and patent, regardless of 
whether such licenses would be required. Accordingly, under the agreement, 
the generic manufacturer granted the Company a license to sell products under 
the generic manufacturer's above referenced patent, under a formulation 
patent owned by such generic manufacturer, and under corresponding foreign 
patents owned by such generic manufacturer, and the Company granted the 
generic manufacturer the right to sell such generic manufacturer's products 
that are covered by the claims in the Company's patent application and 
corresponding foreign applications owned by the Company. As consideration for 
entering into the agreement, the Company agreed to pay the generic 
manufacturer certain license fees and royalties on the net sales of NIASPAN 
subject to a cap on such royalty payments in the United States and a separate 
cap on such payments outside the United States. Neither the license fees nor 
the royalty payments are material to the financial condition of the Company. 
The Company may sublicense its rights under the agreement to third parties to 
make, use, or sell products developed by or for the Company. The generic 
manufacturer may not sublicense or transfer the license granted to it by Kos, 
although the generic manufacture may sublicense to third parties the right to 
supply to the generic manufacturer or market with or on behalf of the generic 
manufacturer, products that are covered by the generic manufacturer's patents 
but which are not covered by the Company's patent application. The Company 
may terminate the agreement after February 7, 2001. 

   Various inhalation devices, technologies, and methods of use licensed 
from, or assigned to Kos by, researchers and engineers engaged in development 
projects or sponsored research on behalf of Kos are the subject of four 
issued and one allowed U.S. patent, as well as various corresponding foreign 
patents. Similar patents applied for in other foreign countries are pending 
and being pursued by the Company. Six patent applications on certain of the 
Company's products under development and pertaining to certain of the 
sponsored research activities are pending at the PTO. The Company believes 
that most of the once-daily oral products in development under Kos' 
agreements with Fuisz are protected by various technology patents in the name 
of Fuisz. 

   There can be no assurance, however, that the patents owned and licensed by 
the Company, or any future patents, will prevent other companies from 
developing similar or therapeutically equivalent products or that others will 
not be issued patents that may prevent the sale of Company products or 
require licensing and the payment of significant fees or royalties by the 
Company. Furthermore, there can be no assurance that any of the Company's 
future products or methods will be patentable, that such products or methods 
will not infringe upon the patents of third parties, or that the Company's 
patents or future patents will give the Company an exclusive position in the 
subject matter claimed by those patents. 

   NIASPAN and Kos are the Company's principal registered trademarks, 
although eight other marks have been allowed and published by the PTO and 
will become registered trademarks upon their use by the Company. As the 
Company is not yet marketing any product, none of its planned trademarks are 
considered critical to the business of the Company. 

MARKETING 

   Kos intends to market its branded proprietary products through its own 
specialty sales force. A fundamental element of the Company's product 
selection strategy is to focus on products where a relatively concentrated 
group of specialist physicians account for a significant portion of the 
prescriptions for the therapeutic indication addressed by the Company's 
products. The Company believes that such specialist physicians will be the 
most receptive to the patient compliance, safety, or 

                               34           
<PAGE>
other therapeutic advantages that the Company's products will seek to offer. 
Accordingly, the Company believes that significant market gains can be 
achieved with such products through the use of a relatively small, well 
trained sales force concentrating its detailing efforts on informing such 
specialist physicians about the scientific basis for the therapeutic 
advantages of the Company's products. 

   The Company has not yet established a sales and marketing organization nor 
has it yet marketed, distributed or sold any product. Members of the 
Company's management, however, have substantial prior experience in 
establishing a sales force to market products to specialist physicians. The 
Company anticipates having an initial sales force of approximately 70 field 
sales representatives and managed care specialists in place prior to the 
expected launch of NIASPAN in 1997. Following the launch of NIASPAN and the 
approval of additional products for marketing, the Company plans to expand 
substantially its direct sales force to enable it to adequately detail such 
products to the specialists in both the cardiovascular and respiratory 
markets as appropriate. In particular, the Company intends to leverage its 
initial NIASPAN sales force by marketing future cardiovascular products, as 
they are approved, simultaneously with NIASPAN. 

   Following the introduction of NIASPAN, the Company expects to increase its 
detailing efforts to a larger group of cardiovascular specialists and other 
frequent prescribers of lipid-altering medications through the use of a 
contract detail force. The Company will also consider developing its own 
specialized flex-time (or part-time) sales representatives either to 
supplement or replace the contract detail force. It is expected that the use 
of contract and flex-time field forces will be used, in combination or alone, 
by the Company in the future as other products are added to assist with new 
product launches and to supplement the ongoing detail efforts of the 
specialized sales force. Although the Company has had no discussions with any 
such contract detail organization nor has it commenced the development of its 
own flex-time sales force, the Company's management has had substantial 
experience with the use of such field sales organizations to supplement 
internal sales forces. See "--Cardiovascular Products--Controlled-Release 
NIASPAN--Marketing Strategy for NIASPAN." 

   Following the launch of NIASPAN in the United States, the Company plans to 
license marketing rights to an established marketing partner in major 
international markets. Ultimately, the Company will consider establishing its 
own sales organization in selected foreign markets. To date, the Company has 
had no material discussions concerning such possible arrangements with other 
companies. 

MANUFACTURING 

   In order to maximize the quality of developed products, assure compliance 
with regulatory requirements, and minimize costs, the Company intends to 
manufacture all of its products internally. The Company currently has 
solid-dose production capability in both its Hollywood, Florida and Edison, 
New Jersey facilities.The Company's Edison facility is currently configured, 
and largely equipped, to manufacture aerosol inhalation products using both 
CFC and non-CFC propellants. Although the Company believes that both of these 
facilities currently operate using current good manufacturing practices as 
required by the FDA for the manufacture of product to be used in clinical 
trials, both facilities will require inspection and approval by the FDA 
before production for commercial sale can commence. The Company estimates 
that it has sufficient capacity, with limited additional capital outlays, to 
accommodate sales volume for both solid-dose and aerosol products through the 
year 2000. 

   The Company intends initially to contract the packaging of its solid-dose 
and aerosol products to third parties. The Company intends to begin in-house 
packaging operations once product sales volumes justify the capital 
expenditures required to establish such capabilities. Certain of the 
Company's raw materials, including the active ingredient in NIASPAN, are 
currently obtained from single sources of supply. The Company does not have a 
contractual arrangement with the sole supplier of the active ingredient in 
NIASPAN pursuant to which the Company obtains such incredient. The Company 
intends, to the extent possible, to identify multiple sources for all of its 
key raw materials, including the active ingredient in NIASPAN, although an 
alternate source for at least one such material will not be available because 
of the supplier's patent rights. 

                               35           
<PAGE>
COMPETITION 

   The Company's products will be competing with currently existing or future 
prescription pharmaceuticals and vitamins in the United States, Europe and 
elsewhere. Competition among these products will be based on, among other 
things, efficacy, safety, reliability, availability, price and patent 
position. In addition, academic institutions, government agencies and other 
public and private organizations conducting research may seek patent 
protection, discover new drugs or establish collaborative arrangements for 
drug research. Many of the Company's existing or potential competitors have 
substantially greater financial, technical and human resources than the 
Company and may be better equipped to develop, manufacture and market 
products. 

   The Company's cardiovascular and respiratory products, when developed and 
marketed, will compete in most cases with well established products 
containing the same active ingredient already being marketed by medium-sized 
and large pharmaceutical companies in the United States. For example, the 
Company's captopril formulation will compete with several other ACE 
inhibitors that are currently available, all of which have approval for 
treatment of certain indications using once-a-day administration. Kos is 
aware of one other company that is developing a once-a-day formulation of 
captropril. Further, the Company's triamcinolone and flunisolide formulations 
each will compete with another triamcinolone and flunisolide product, 
respectively, already being marketed in the United States. Although such 
competing products are sold only in a CFC version, the Company believes that 
the originators are developing non-CFC versions. 

   Moreover, there are numerous manufacturers of niacin preparations 
indicated for use as vitamin supplements or, in IR form, for treatment of 
hyperlipidemia. The Company is not aware that any such manufacturer is 
actively pursuing an NDA for the once-a-day use of niacin as a lipid-altering 
agent. The Company believes, however, that a generic manufacturer has 
performed an early-stage clinical study using niacin as a once-a-day 
treatment for lipid-altering. Further, the Company's NIASPAN product will 
compete with many existing lipid-altering medications, which currently 
account for more than 90% of the lipid-altering market. 


GOVERNMENT REGULATION 

   The development, manufacture and potential sales of prescription 
pharmaceutical products is subject to extensive regulation by U.S. and 
foreign governmental authorities. In particular, pharmaceutical products are 
subject to rigorous preclinical and clinical testing and to other approval 
requirements by the FDA in the United States under the Federal Food, Drug and 
Cosmetic Act ("FFDCA") and the Public Health Service Act and by comparable 
agencies in most foreign countries. 

   Before testing of any agents with potential therapeutic value in healthy 
human test subjects or patients may begin, stringent government requirements 
for preclinical data must be satisfied. The data, obtained from studies in 
several animal species, as well as from laboratory studies, are submitted in 
an IND application, or its equivalent in countries outside the United States, 
where clinical studies are to be conducted. The preclinical data must provide 
an adequate basis for evaluating both the safety and the scientific rationale 
for the initiation of clinical trials. 

   Clinical trials are typically conducted in three sequential phases, 
although the phases may overlap. In Phase I, which frequently begins with the 
initial introduction of the compound into healthy human subjects prior to 
introduction into patients, the product is tested for safety, adverse 
affects, dosage, tolerance, absorption, metabolism, excretion and other 
elements of clinical pharmacology. Phase II typically involves studies in a 
small sample of the intended patient population to assess the efficacy of the 
compound for a specific indication, to determine dose tolerance and the 
optimal dose range as well as to gather additional information relating to 
safety and potential adverse effects. Phase III trials are undertaken to 
further evaluate clinical safety and efficacy in an expanded patient 
population at geographically dispersed study sites, in order to determine the 
overall risk-benefit ratio of the compound and to provide an adequate basis 
for product labeling. Each trial is conducted in accordance 

                               36           
<PAGE>
with certain standards under protocols that detail the objectives of the 
study, the parameters to be used to monitor safety and the efficacy criteria 
to be evaluated. Each protocol must be submitted to the FDA as part of the 
IND. 

   Data from preclinical and clinical trials are submitted to the FDA as a 
NDA for marketing approval and to other health authorities as a marketing 
authorization application. The process of completing clinical trials for a 
new drug is likely to take a number of years and require the expenditure of 
substantial resources. Preparing a NDA or marketing authorization application 
involves considerable data collection, verification, analysis and expense, 
and there can be no assurance that approval from the FDA or any other health 
authority will be granted on a timely basis, if at all. The approval process 
is affected by a number of factors, primarily the risks and benefits 
demonstrated in clinical trials as well as the severity of the disease and 
the availability of alternative treatments. The FDA or other health 
authorities may deny a NDA or marketing authorization application if the 
regulatory criteria are not satisfied, or such authorities may require 
additional testing or information. 

   Even after initial FDA or other health authority approval has been 
obtained, further studies, including Phase IV post-marketing studies, may be 
required to provide additional data on safety and will be required to gain 
approval for the use of a product as a treatment for clinical indications 
other than those for which the product was initially tested. Also, the FDA or 
other regulatory authorities require post-marketing reporting to monitor the 
adverse effects of the drug. Results of post-marketing programs may limit or 
expand the further marketing of the products. Further, if there are any 
modifications to the drug, including changes in indication, manufacturing 
process or labeling or a change in manufacturing facility, an application 
seeking approval of such changes must be submitted to the FDA or other 
regulatory authority. 

   The FFDCA also provides for NDA submissions that may rely in whole or in 
part on preclinical and clinical safety and efficacy data that are publicly 
available or are allowed to be referenced from another NDA. The Company may 
be able to utilize existing publicly available safety and efficacy data in 
filing NDAs for controlled-release products when such data exist for an 
approved immediate-release version of the same chemical entity. The Company 
intends to utilize all relevant available data for its products under 
development, where appropriate, in order to reduce preclinical and clinical 
testing and overall development time. There can be no assurance, however, 
that the FDA will accept such data in the Company's applications, or that 
such existing data will be available or useful. 

   Certain amendments to the FFDCA established abbreviated application 
procedures for obtaining FDA approval for generic versions of brand name 
prescription drugs that are off patent or whose marketing exclusivity has 
expired. Approval to manufacture and market generic drugs is obtained by 
filing ANDAs. As a substitute for clinical studies, the FDA requires, among 
other items, data demonstrating that the ANDA drug formulation is 
bioequivalent to the previously approved brand name formulation. The 
advantage of the ANDA approval is that an ANDA applicant is not required to 
conduct preclinical and clinical studies to demonstrate that the product is 
safe and effective for its intended use. 

   Whether or not FDA approval has been obtained, approval of a product by 
regulatory authorities in foreign countries must be obtained prior to the 
commencement of commercial sales of the product in such countries. The 
requirements governing the conduct of clinical trials and product approvals 
vary widely from country to country, and the time required for approval may 
be longer or shorter than that required for FDA approval. Although there are 
some procedures for unified filings for certain European countries, in 
general, each country at this time has its own procedures and requirements. 
Further, the FDA regulates the export of products produced in the United 
States and may prohibit the export even if such products are approved for 
sale in other countries. 

   The Company's research and development involves the controlled use of 
hazardous materials, chemicals, and various radioactive compounds. Although 
the Company believes that its procedures for handling and disposing of those 
materials comply with state and federal regulations, the risk of 
contamination or injury from these materials cannot be eliminated. In the 
event of such contamination 

                               37           
<PAGE>
or injury, the Company could be held liable for resulting damages, which 
could be material to the Company's business, financial condition and results 
of operations. The Company is also subject to numerous environmental, health 
and workplace safety laws and regulations, including those governing 
laboratory procedures, exposure to blood-borne pathogens, and the handling of 
biohazardous materials. Additional federal, state and local laws and 
regulations affecting the Company may be adopted in the future. Any violation 
of, and the cost of compliance with, these laws and regulations could 
materially and adversely affect the Company. 

   Completing the multitude of steps necessary prior to the commencement of 
marketing requires the expenditure of considerable resources and a lengthy 
period of time. Delay or failure in obtaining the required approvals, 
clearances, permits or inclusions by the Company or its future corporate 
partners or licensees, if any, would have a material adverse effect on the 
ability of the Company to generate sales or royalty revenue. Further, the 
passage and implementation of new or changed laws or regulations or the 
potential impact on the Company of such actions cannot be anticipated. 

   One of the Company's products under development, albuterol (CFC), uses CFC 
propellants. CFC propellants are ozone-depleting substances, the use of which 
is restricted under the Federal Clean Air Act and the Montreal Protocol on 
Substances that Deplete the Ozone Layer. The United Nations Technology and 
Economic Assessment Panel (TEAP) reviews requests for specific essential use 
allocations of CFCs under the Montreal Protocol and makes recommendations to 
the parties, who determine the yearly bulk allocations for each country. 
Recently, the Company's Essential Use Application for the use of CFCs during 
1997 and 1998 was approved by TEAP and the parties to the Montreal Protocol. 
Although the Company has received its requested allocation for 1997 and 1998 
there can be no assurance that it will receive all or any part of its 
allocation for 1999, or allocations for future years. 

EMPLOYEES 

   The Company has approximately 105 permanent employees, of which 68 are 
engaged in research and development and 19 in manufacturing. No employee is 
represented by a union. The Company regularly employs the services of outside 
consultants with respect to regulatory, scientific, and certain 
administrative and commercial matters. The Company expects to continue to 
require the services of such outside consultants. The Company believes its 
employee relations are good. 

FACILITIES 

   The Company leases approximately 3,400 square feet for its executive 
offices pursuant to a lease that expires in 1997. The Company leases 
approximately 14,500 square feet in adjacent buildings in Hollywood, Florida, 
which are used for the research and development and solid-dose manufacturing 
operations. These leases expire in November 2000, assuming the Company elects 
to exercise certain renewal options. An additional 5,200 square feet of 
office space at the same Hollywood site is leased through July 1997. The 
Company also occupies approximately 21,500 square feet of space in Edison, 
New Jersey under a lease that expires in October 2003, assuming the Company 
elects to exercise a five-year renewal option. The Edison, New Jersey 
facility is used for research and development, solid-dose manufacturing, and 
aerosol manufacturing. 

LEGAL PROCEEDINGS 

   There are no legal proceedings pending against the Company or its 
properties or to which the Company is a party. 

                               38           
<PAGE>
                                  MANAGEMENT 

   The following table provides information regarding directors, director 
nominees, executive officers and key personnel of the Company: 

DIRECTORS AND EXECUTIVE OFFICERS 

<TABLE>
<CAPTION>
           NAME             AGE                        POSITION 
- ----------------------------------------------------------------------------------
<S>                       <C>    <C>
Michael Jaharis ......... 68     Chairman of the Board of Directors 
Daniel M. Bell .......... 54     President, Chief Executive Officer and Director 
Robert E. Baldini ....... 66     Vice Chairman of the Board of Directors 
David J. Bova ........... 51     Senior Vice President, Product Development 
John Brademas, Ph.D.  ... 69     Director Nominee(1) 
Steven Jaharis, M.D.  ... 37     Director(1)(2) 
Louis C. Lasagna, M.D.  . 74     Director Nominee(1) 
Mark Novitch, M.D. ...... 64     Director Nominee(2) 
Frederick B. Whittemore   66     Director Nominee(2) 
</TABLE>

OTHER KEY EMPLOYEES 

<TABLE>
<CAPTION>
              NAME              AGE                         POSITION 
              ----              ---                         --------
<S>                             <C>    <C>
Marvin F. Blanford, Pharm. D.   49     Vice President, Compliance 
Eugenio A. Cefali, Ph.D.  ..... 38     Vice President, Clinical Pharmacology 
Anthony J. Cutie, Ph.D.  ...... 53     Vice President, Aerosol Research & Development 
David L. Heatherman ........... 50     Vice President, Sales & Marketing 
Frederick A. Sexton ........... 37     Vice President, Technical Operations 
Arthur W. Brinkmann ........... 62     Director of Human Resources 
Christopher P. Kiritsy ........ 32     Director of Financial Analysis and Business Planning 
Mukesh P. Patel ............... 39     Director of Licensing 
Juan F. Rodriguez ............. 29     Controller 
</TABLE>

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

(1) Proposed member of the Audit Committee 

(2) Proposed member of the Compensation and Stock Option Committee 

   MICHAEL JAHARIS, a founder of the Company, has, since its inception, 
funded the operations of the Company and served as Chairman of the Board. In 
this position, Mr. Jaharis has been actively involved in the development of 
the Company's business strategy and in critical implementation decisions. 
From 1972 until its acquisition by Schering-Plough Corporation 
("Schering-Plough") in 1986, Mr. Jaharis served as the President and Chief 
Executive Officer of Key Pharmaceuticals, Inc. ("Key Pharmaceuticals"). Mr. 
Jaharis also serves as Chairman of Kos Investments and Kos Holdings, as 
Trustee of Tufts University, and as Chairman of the Board of Overseers of 
Tufts University School of Medicine. 

   DANIEL M. BELL, a founder of the Company, has served as a Director and as 
the President and Chief Executive Officer of the Company since its inception. 
Mr. Bell also serves as a director of Kos Investments and Kos Holdings and as 
a director of two private companies in which Kos Investments or Michael 
Jaharis is the largest shareholder. From 1983 to 1986, Mr. Bell was employed 
by Key Pharmaceuticals and was serving as its Executive Vice President and 
Chief Operating Officer at the time of its acquisition by Schering-Plough in 
June 1986. 

   ROBERT E. BALDINI has served as Vice Chairman of the Board since July 1996 
and as a senior marketing consultant to the Company since April 1996. In 
these positions, Mr. Baldini serves as an executive officer of the Company. 
In addition to performing services for the Company, Mr. Baldini serves as a 
consultant to, and director of, several private pharmaceutical and medical 
device companies. Mr. Baldini served Key Pharmaceuticals from 1982 to 1986 as 
Senior Vice President of Sales and Marketing. Following its acquisition by 
Schering-Plough, he continued with the Key Pharmaceuticals Division of 
Schering-Plough until 1995, last serving as its President. 

                               39           
<PAGE>
   DAVID J. BOVA, a founder of the Company, has directed the Company's 
product development efforts since inception and now serves as Senior Vice 
President, Product Development. Prior to the founding of Kos, Mr. Bova was at 
Key Pharmaceuticals from 1981 until its acquisition by Schering-Plough; he 
continued with Schering-Plough until the founding of Kos in 1988. At Key 
Pharmaceuticals, he last served as the Director of Product Development. Prior 
to 1981, Mr. Bova was employed by the USV pharmaceutical operation of Revlon 
Healthcare. 

   JOHN BRADEMAS, PH.D. has been nominated to become a Director of the 
Company immediately following the closing of this offering. Dr. Brademas has 
been President Emeritus of New York University since 1992. Prior to 1992, he 
was President of New York University for eleven years and was the U.S. 
Representative in Congress for Indiana's Third District for twenty-two years. 
Dr. Brademas serves as a director of Texaco, Inc., NYNEX Corporation, 
Scholastic, Inc., and Loews Corporation. He is a former Chairman of the 
Federal Reserve Bank of New York and a former director of the New York Stock 
Exchange. 

   STEVEN JAHARIS, M.D. has served as a Director of the Company since its 
inception. Dr. Jaharis has been a practicing physician since 1990 and 
currently serves as a family practitioner at Rush Prudential H.M.O. Dr. 
Jaharis is the son of Michael Jaharis. 

   LOUIS C. LASAGNA, M.D. has been nominated to become a Director of the 
Company immediately following the closing of this offering. Dr. Lasagna has 
served as the Dean of the Sackler School of Graduate Biomedical Sciences at 
Tufts University since 1984. Dr. Lasagna serves as a director of Astra U.S.A. 
Inc., a subsidiary of Astra AB. 

   MARK NOVITCH, M.D. has been nominated to become a Director of the Company 
immediately following the closing of this offering. Dr. Novitch has served as 
Professor of Health Care Sciences at George Washington University since 1994. 
Dr. Novitch was with The Upjohn Company from 1985 to 1993, last serving as 
its Vice Chairman. From 1971 to 1985, Dr. Novitch was with the FDA, serving 
as Deputy Commissioner from 1981 to 1985. Dr. Novitch serves as a director of 
Alteon, Inc., Guidant Corporation, Neurogen Corporation, and Calypte 
Biomedical, Inc. 

   FREDERICK B. WHITTEMORE has been nominated to become a Director of the 
Company immediately following the closing of this offering. Mr. Whittemore 
has been with Morgan Stanley Group since 1958 and presently serves as 
Advisory Director. Mr. Whittemore is a director of various mutual funds 
organized under Morgan Stanley Asset Management, Inc. Mr. Whittemore also 
serves as a director of Chesapeake Energy Corporation, PartnerRe Holdings, 
Ltd., and Integon, Inc. 

   MARVIN F. BLANFORD, PHARM. D. joined Kos in 1996 and serves as Vice 
President, Compliance. Dr. Blanford was the Director of Clinical Research for 
Noven Pharmaceuticals, Inc. from 1992 to 1995. Previously joining Noven, Dr. 
Blanford was vice president of a major independent clinical research 
organization. Dr. Blanford also worked for Key Pharmaceuticals as a research 
manager from 1981 through 1984. 

   EUGENIO A. CEFALI, PH.D. joined the Company in January 1994 and serves as 
Vice President, Clinical Pharmacology. Dr. Cefali was responsible for 
clinical pharmacology and Phase IV clinical research at Whitby 
Pharmaceuticals from 1991 to 1994. Prior to 1991, Dr. Cefali was at Key 
Pharmaceuticals and Schering-Plough where he was responsible for in-vivo 
evaluation of certain oral sustained release and transdermal dosage forms. 

   ANTHONY J. CUTIE, PH.D. serves as Vice President, Aerosol Research and 
Development; he has been the Chief Scientific Officer of the Company's 
aerosol subsidiary since its founding in 1993. For more than 25 years, Dr. 
Cutie has been an industry consultant in pharmaceutical aerosols and he has 
worked with over 50 pharmaceutical companies ranging from large 
multinationals to small generic companies. He has served as a consultant for 
the FDA, and he has been an active member of various United States 
Pharmacopia committees and two aerosol committees of the American Association 
of Pharmaceutical Scientists. Dr. Cutie also serves as Professor of 
Industrial Pharmacy at Long Island University. 

                               40           
<PAGE>
   DAVID L. HEATHERMAN has served as Vice President, Sales and Marketing 
since July 1996. Mr. Heatherman worked for Schering-Plough from 1972 to 1996 
in several capacities including Senior Product Promotion Director, Regional 
Sales Director, last serving as Managed Care Director. 

   FREDERICK A. SEXTON joined the Company in January 1996 and serves as Vice 
President, Technical Operations. Prior to joining the Company, Mr. Sexton was 
employed by Boehringer Ingelheim Pharmaceuticals from 1984 through 1995 in 
various production and quality assurance positions involving solid-dose and 
aerosol products. Prior to 1984, Mr. Sexton was employed by Ayerst 
Laboratories in research and production positions. 

   ARTHUR W. BRINKMANN has served as Director, Human Resources since 
September, 1991. Mr. Brinkmann was Director of Human Resources at Key 
Pharmaceuticals and Schering-Plough from 1984 to 1989. Prior to Key 
Pharmaceuticals, Mr. Brinkmann worked in human resources at Johnson & Johnson 
for twenty-one years. 

   CHRISTOPHER P. KIRITSY joined the Company in June 1995 and serves as 
Director, Financial Analysis and Business Planning. Prior to joining the 
Company, Mr. Kiritsy was with Institute of Molecular Biology, Inc., a 
development stage biotechnology concern, from 1988 to 1995, where he last 
served as Associate Director of Product Development. 

   MUKESH P. PATEL has served as Director, Licensing since July 1991. Mr. 
Patel was employed by Glaxo in London, England for eleven years prior to 
joining the Company, last serving as an International Licensing Executive for 
Glaxo Holdings. 

   JUAN F. RODRIGUEZ, a certified public accountant, joined the Company in 
November 1995 and serves as Controller. Prior to joining Kos, Mr. Rodriguez 
was employed by the accounting firms of Rosen and Co. from 1994 to 1995 and 
Arthur Andersen LLP from 1991 to 1994. 

ELECTION, COMMITTEES AND COMPENSATION OF DIRECTORS 

   Prior to the consummation of this offering, the Company intends to 
establish a Compensation and Stock Option Committee and an Audit Committee. 

   The Compensation and Stock Option Committee will administer the Company's 
1996 Stock Option Plan (the "Option Plan") including, among other things, 
determining the amount, exercise price and vesting schedule of stock options 
awarded under the Option Plan. The Compensation and Stock Option Committee 
will administer the Company's other compensation programs and perform such 
other duties as may from time to time be determined by the Board of 
Directors. The Compensation and Stock Option Committee is expected to be 
comprised of Dr. Jaharis, Dr. Novitch, and Mr. Whittemore. 

   The Audit Committee will review the scope and results of the annual audit 
of the Company's consolidated financial statements conducted by the Company's 
independent accountants, the scope of other services provided by the 
Company's independent accountants, proposed changes in the Company's 
financial and accounting standards and principles, and the Company's policies 
and procedures with respect to its internal accounting, auditing and 
financing controls. The Audit Committee will also examine and consider other 
matters relating to the financial affairs and accounting methods of the 
Company, including selection and retention of the Company's independent 
accountants. The Audit Committee is currently expected to be comprised of Dr. 
Brademas, Dr. Jaharis, and Dr. Lasagna. 

   Each non-employee and non-consultant director of the Company, is entitled 
to receive a fee of $1,000 for attendance at each meeting of the Board of 
Directors. In addition, each non-employee and non-consultant director is 
entitled to receive $500 for attendance at each meeting of a committee of the 
Board of Directors. All directors are reimbursed for travel expenses incurred 
in connection with the performance of their duties as directors. 

                               41           
<PAGE>
   Each non-employee and non-consultant director is entitled to receive an 
option to purchase 5,000 shares of Common Stock upon their appointment to the 
Board of Directors and is entitled to receive an option to purchase 3,000 
shares of Common Stock annually thereafter, so long as they continue to serve 
on the Board of Directors. See "Management--Stock Option Plan." 

   Michael Jaharis has elected not to receive fees or stock options in 
connection with his serving as Chairman of the Board. Although Mr. Jaharis 
has been actively involved in the development of the Company's business 
strategy and in critical implementation decisions, he has never been paid 
compensation by the Company for acting in such capacity. Since July 1, 1996, 
however, the Company has leased an automobile for Mr. Jaharis' use. 

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION 

   During the fiscal year ended June 30, 1996, Michael Jaharis, the Company's 
Chairman of the Board, and Daniel M. Bell, the Company's President and Chief 
Executive Officer, participated in deliberations of the Company's Board of 
Directors concerning executive officer compensation. Prior to this offering, 
the Company did not have a stock option or compensation committee. 

EXECUTIVE COMPENSATION 

   The following table summarizes the compensation during the fiscal years 
ended June 30, 1996, 1995 and 1994, paid to or earned by the Company's Chief 
Executive Officer and to the other executive officers of the Company whose 
annual salary and bonuses exceeded $100,000 during the fiscal year ended June 
30, 1996 (collectively, the "Named Executive Officers"). 

                          SUMMARY COMPENSATION TABLE 

<TABLE>
<CAPTION>
                                                                                        LONG-TERM COMPENSATION 
                                                                              ------------------------------------------
                                               ANNUAL COMPENSATION                        AWARDS                PAYOUTS 
                                     --------------------------------------  ------------------------------  ----------
                                                                                RESTRICTED      SECURITIES 
                                                              OTHER ANNUAL        STOCK         UNDERLYING       LTIP   ALL OTHER 
NAME AND                               SALARY       BONUS     COMPENSATION       AWARD(S)      OPTIONS/SARS    PAYOUTS COMPENSATION 
PRINCIPAL POSITION            YEAR       ($)         ($)           ($)             ($)             (#)            ($)     ($)(1) 
- ------------------            ----     ------     - -----     ------------      ----------     ------------     ------- ------------
<S>                           <C>      <C>         <C>        <C>               <C>            <C>              <C>     <C>
Daniel M. Bell                1996     246,000         --          --              --          750,000(2)        --       4,928 
 President and                1995     246,000     10,000          --              --               --           --       1,814 
  Chief Executive Officer     1994     246,000         --          --              --               --           --         890 

David J. Bova                 1996     185,000     25,000          --              --               --           --       1,091 
 Senior Vice President,       1995     185,000         --          --              --               --           --         726 
  Product Development         1994     164,167         --          --              --               --           --         605 
</TABLE>
- -----------------------------------------------------------------------------
(1) Consists of life insurance premiums paid by the Company. 

(2) The options originally were granted to Mr. Bell in August 1988. The 
    option terms were amended on June 20, 1996, to extend the expiration date 
    of the options from December 1996 to June 20, 2006. Other material terms 
    of the options, including the exercise price, were not changed. The 
    options are currently exercisable. 

                               42           
<PAGE>
   The following table contains information about stock option grants to 
Named Executive Officers during the fiscal year ended June 30, 1996. 

                      OPTION GRANTS IN LAST FISCAL YEAR 
<TABLE>
<CAPTION>
                                                                                                       POTENTIAL REALIZABLE 
                                          INDIVIDUAL GRANTS                                              VALUE AT ASSUMED 
                ----------------------------------------------------------------------------              ANNUAL RATE OF 
                   NUMBER OF SECURITIES    % OF TOTAL OPTIONS  EXERCISE OR                          STOCK PRICE APPRECIATION 
                    UNDERLYING OPTIONS    GRANTED TO EMPLOYEES  BASE PRICE  EXPIRATION               FOR OPTION TERM(1) 
NAME                   GRANTED (#)           IN FISCAL YEAR     ($/SHARE)      DATE       0%($)          5%($)       10%($) 
- ---------------- --------------------- ---------------------   ----------   ----------  -------------   ----------  -------
<S>               <C>                    <C>                    <C>         <C>         <C>            <C>         <C>
DANIEL M. BELL           750,000(2)              41%            $0.60       6/20/06     $4,800,000     $7,818,694  $12,449,964 
DAVID J. BOVA  .              --                 --                --            --             --             --           --
</TABLE>
- -----------------------------------------------------------------------------
(1) Amounts reflect hypothetical gains that could be achieved for the options 
    if they are exercised at the end of the option term. Those gains are 
    based on assumed rates of stock appreciation of 0%, 5% and 10% compounded 
    annually from the date the option was modified through the expiration 
    date. The Board of Directors estimated the fair market value of Common 
    Stock to be $7.00 per share on the date of such modification. 

(2) The options originally were granted to Mr. Bell in August 1988. The 
    option terms were amended on June 20, 1996, to extend the expiration date 
    of the options from December 1996 to June 20, 2006. Other material terms 
    of the options, including the exercise price, were not changed. The 
    options are currently exercisable. 

   The following table provides information about the number and value of 
options held by the Named Executive Officers at June 30, 1996: 

                        FISCAL YEAR-END OPTION VALUES 
<TABLE>
<CAPTION>
                        NUMBER OF SECURITIES               VALUE OF UNEXERCISED 
                   UNDERLYING UNEXERCISED OPTIONS          IN-THE-MONEY OPTIONS 
                            AT FY-END(#)                     AT FY-END($)(1) 
                  --------------------------------  --------------------------------
NAME                EXERCISABLE     UNEXERCISABLE     EXERCISABLE     UNEXERCISABLE 
- ---------------- -------------- ----------------  -------------- ----------------
<S>               <C>             <C>                <C>             <C>
Daniel M. Bell        750,000            --           $4,800,000           --
David J. Bova  .      275,000            --           $1,718,750           --
</TABLE>
- -----------------------------------------------------------------------------

(1) For purposes of determining the values of the options held by Named 
    Executive Officers, the Company has assumed that Common Stock had a value 
    of $7.00 per share on June 30, 1996, which is the estimated fair market 
    value the Board of Directors had attributed to the Common Stock on June 
    20, 1996, in connection with certain grants of options under the 
    Company's stock option plan. The option value is based on the difference 
    between the fair market value of the shares on June 30, 1996 and the 
    option exercise price per share, multiplied by the number of shares of 
    Common Stock subject to the option. 

CONFIDENTIALITY AND INTELLECTUAL PROPERTY AGREEMENTS 

   Each employee of the Company has entered into a Confidentiality Agreement 
that (i) prohibits the employee from disclosing confidential information 
relating to the Company and (ii) provides that intellectual property 
conceived by the employee during the term of employment and relating to the 
business of the Company remains the exclusive property of the Company. 

EMPLOYMENT AGREEMENTS 

   The Company entered into an employment agreement with Daniel M. Bell dated 
as of July 1, 1996. Under the agreement, Mr. Bell serves as President and 
Chief Executive Officer of the Company for a term expiring on June 30, 2002, 
unless earlier terminated for cause, upon the death or disability of Mr. 
Bell, or, at the election of Mr. Bell, upon a change in control of the 
Company. In the event that Mr. Bell is terminated without cause or upon a 
change in control of the Company, Mr. Bell is entitled to receive as 
severance compensation his base salary, bonus compensation and annual stock 
options until the later to occur of the date thirty-six months after such 
termination and June 30, 2002. The agreement provides that Mr. Bell receive 
base annual compensation of $250,000 for each year during the term of the 
agreement, subject to an annual increase in an amount to be determined by the 
Board of Directors. Under the agreement, Mr. Bell also receives an annual 
bonus and an annual stock option grant in amounts to be determined by the 
Board of Directors based upon Mr. Bell's and the Company's 

                               43           
<PAGE>
performance. Mr. Bell was paid a bonus of $150,000 in December 1996. The 
agreement also provides that the Company will provide Mr. Bell with the use 
of an automobile. Mr. Bell is prohibited from competing with the Company 
during the term of the agreement and for two years after termination thereof. 

   The Company entered into an employment agreement with David Bova dated as 
of June 15, 1996, pursuant to which Mr. Bova serves as Senior Vice President 
of the Company. This agreement constitutes an amendment and restatement of a 
previous employment agreement with Mr. Bova, dated December 18, 1992. Under 
the agreement, the term of Mr. Bova's employment terminates on December 31, 
1997 unless earlier terminated for cause, upon the death or disability of Mr. 
Bova, or, at the election of Mr. Bova, upon a change in control of the 
Company. Notwithstanding the foregoing, the Company may exercise an option to 
extend the term of the agreement for up to twenty-four additional months. The 
agreement provides that Mr. Bova receive a base salary of $195,000 per year, 
which amount may be increased by the Company. In December 1996, the Company's 
Board of Directors determined to award a $25,000 bonus to Mr. Bova, payable 
to Mr. Bova in 1997. In the event that Mr. Bova is terminated without cause 
or upon a change in control of the Company, Mr. Bova is entitled to receive 
as severance compensation his base salary until December 31, 1997. In 
addition, the agreement provides that Mr. Bova receive royalties in an amount 
equal to one percent of the net sales of the Company's NIASPAN product and 
its combination product through December 31, 2003, up to a cap of $4,000,000. 
The agreement provides that, under certain enumerated circumstances, the 
royalty amount may be reduced to 0.5% of net sales. The agreement also 
provides that under certain specific circumstances, the Company's obligation 
to pay royalties may cease upon Mr. Bova's termination with the Company. The 
agreement prohibits Mr. Bova from competing with the Company during the term 
of the agreement and for a period of two years after the termination thereof. 

   The Company entered into a consulting agreement with Robert Baldini 
effective as of April 1, 1996, pursuant to which Mr. Baldini serves as Vice 
Chairman of the Board and as senior marketing consultant to the Company, 
advising the Company with respect to its establishment of a sales force and 
its marketing efforts. Mr. Baldini will receive $75,000 per year under the 
agreement and is obligated to devote fifty days per year to Company matters. 
The term of the agreement continues for five years. The agreement is 
automatically renewable for successive two year periods unless either party 
provides thirty days prior written notice of its desire not to renew. The 
agreement is terminable by either party upon 120 days prior written notice. 
The agreement prohibits Mr. Baldini from competing with the Company during 
the term of the Agreement. 

EMPLOYEE BENEFIT PLANS 

STOCK OPTION PLAN 

   The Option Plan provides for the grant of both nonstatutory stock options 
and stock options intended to be treated as incentive stock options within 
the meaning of Section 422 of the Internal Revenue Code. The Option Plan is 
intended to provide incentives to, and rewards for, certain eligible 
employees, consultants and outside directors of the Company who have 
contributed and will continue to contribute to the success of the Company. 
The Option Plan was adopted by the Board of Directors and the shareholder of 
the Company in June 1996. An aggregate of 3,675,000 shares of Common Stock 
have been reserved for issuance under the Option Plan. The Company has 
granted options to purchase an aggregate of 2,005,500 shares of Common Stock 
under the Option Plan to employees and consultants at exercise prices ranging 
from $0.60 to the initial public offering price per share, including stock 
options covering an aggregate of 750,000 shares of Common Stock granted to 
one of the Company's Named Executive Officers. The Company has also granted 
options to purchase an aggregate of 325,000 shares of Common Stock outside of 
the Option Plan to an employee and a consultant, including stock options 
covering an aggregate of 275,000 shares of Common Stock granted to one of the 
Company's Named Executive Officers. 

   Under the Option Plan, the Compensation and Stock Option Committee of the 
Board of Directors of the Company (the "Stock Option Committee") is 
authorized to administer the Option Plan, 

                               44           
<PAGE>
including the selection of employees and consultants of the Company to whom 
options may be granted. The Stock Option Committee also determines the number 
of shares, the exercise price, the term, any conditions on exercise and other 
terms of each option granted to an employee or consultant. Options granted to 
employees or consultants under the Option Plan become vested over a period of 
four years or such shorter or longer period as may be determined by the Stock 
Option Committee at the time of grant. The duration of an option granted to 
an employee or consultant under the Option Plan is ten years from the date of 
grant, or such shorter or longer period as may be determined by the Stock 
Option Committee at the time of grant or as may result from the death, 
disability, or termination of the employment of the employee or consultant to 
whom the option is granted. 

   The Option Plan prescribes a formula for determining the amount, price and 
timing of awards of stock options to the eligible outside directors. Upon his 
or her election to the Board of Directors of the Company, an eligible outside 
director will receive an option to purchase 5,000 shares of the Company's 
common stock. On each anniversary of his or her appointment to the Board of 
Directors of the Company, an eligible outside director will receive an option 
to purchase 3,000 shares of the Company's common stock. The exercise price of 
each share subject to an option granted to an outside director will be the 
fair market value of the Company's common stock on the later of (a) the 
earlier of the date of an initial public offering of the Company's common 
stock or December 31, 1996, or (b) the date the option is granted. Each 
option granted to an outside director under the Option Plan becomes vested on 
the first anniversary of its date of grant. The duration of an option granted 
to an outside director under the Option Plan is the lesser of ten years from 
the date of grant or one year from the date of the outside director's death. 

   The options are non-transferable other than by will or by the laws of 
descent and distribution. The Option Plan may be amended at any time by the 
Board of Directors, although certain amendments require shareholder approval. 
The Option Plan terminates in June 2006. 

401(K) PLAN 

   The Company's Internal Revenue Code Section 401(k) Plan, known as the Kos 
Savings Plan, became effective on January 1, 1994. Each employee who has 
completed at least one year of service with the Company and has attained age 
21 is eligible to make pre-tax elective deferral contributions each year not 
exceeding the greater of a specified statutory amount or 15 percent of the 
employee's compensation for the year. An employee is always 100 percent 
vested in the employee's elective deferral contributions. The Company makes 
no contributions under this plan. 

                               45           
<PAGE>
                             CERTAIN TRANSACTIONS 

   During 1995 the Company acquired certain property including used 
computers, laboratory equipment and supplies and certain other office 
equipment and furnishings from the Institute of Molecular Biology, Inc. 
("IMB"), a company controlled by Kos Investments. In the aggregate, such 
purchases totaled approximately $83,500. Until June 1996, Daniel M. Bell, the 
Company's President and Chief Executive Officer, also served as the Chairman 
of the Board of Directors and Chief Executive Officer of IMB. 

   Michael Jaharis, the sole shareholder of Kos Investments, has personally 
guaranteed the repayment of a loan to Kos Investments from certain financial 
institutions. Prior to March 21, 1995, the Company was the primary borrower 
under this loan, and therefore received the benefit of the personal guaranty 
extended by Mr. Jaharis. As consideration for Mr. Jaharis's personal 
guaranty, the Company agreed to pay Mr. Jaharis an annual fee of 0.25% of the 
average amount outstanding under the loan during the Company's fiscal year. 
The Company paid Mr. Jaharis $28,700 and $92,333 during the fiscal years 
ended June 30, 1994 and 1995, respectively. In March 1995, the Company was 
released as a borrower under the loan. 

   The Company executed the Convertible Note, dated as of July 1, 1996, the 
proceeds of which will be used to fund the Company's operations until the 
consummation of this offering, in connection with a loan to the Company from 
Kos Investments in the aggregate principal amount of up to $15.0 million. 
Under the terms of this note, interest accrues on the outstanding principal 
amount at First Union National Bank of Florida's prime rate commencing July 
1, 1996, escalating to a rate of 1% over such prime rate during calendar year 
1997, 2% over such prime rate during calendar year 1998, and 3% over such 
prime rate during calendar year 1999 until maturity. Principal and interest 
under this note are due on June 30, 1999. From time to time, at Kos 
Investments' option, principal and interest outstanding under this note may 
be converted, in whole or in part, into Common Stock at a conversion price 
per share equal to the initial public offering price per share. As of 
March 7, 1997, the Company had borrowed $13,395,000 under this note. 

                               46           
<PAGE>
                            PRINCIPAL SHAREHOLDERS 

   The following table sets forth, as of February 7, 1997 and as adjusted at 
that date to reflect the sale of Common Stock offered by the Company hereby, 
information with respect to the beneficial ownership of the Company's Common 
Stock by: (i) each person known by the Company to beneficially own more than 
five percent (5%) of the outstanding shares of the Company's Common Stock; 
(ii) each director and director nominee of the Company; (iii) the Company's 
Named Executive Officers; and (iv) all directors and executive officers as a 
group. Unless otherwise indicated, each of the shareholders named in this 
table: (a) has sole voting and investment power with respect to all shares of 
Common Stock beneficially owned; and (b) has the same address as the Company. 

<TABLE>
<CAPTION>
                                                                          PERCENTAGE 
                                                                     BENEFICIALLY OWNED(1) 
                                                          -----------------------------------------
                                 SHARES BENEFICIALLY 
BENEFICIAL OWNER                       OWNED(1)            BEFORE THE OFFERING   AFTER THE OFFERING 
- --------------------------- --------------------------- --------------------  -------------------
<S>                          <C>                          <C>                    <C>
Michael Jaharis(2) ........           10,000,000                  100.0%                70.7% 
Daniel M. Bell(3) .........              750,000                    7.0%                 5.0% 
David J. Bova(4) ..........              275,000                    2.7%                 1.9% 
Robert E. Baldini(5) ......               50,000                    *                   *
John Brademas, Ph.D.  .....                   --                    --                  --
Steven Jaharis, M.D.  .....                   --                    --                  --
Louis C. Lasagna, M.D.  ...                   --                    --                  --
Mark Novitch, M.D. ........                   --                    --                  --
Frederick B. Whittemore  ..                   --                    --                  --
All Officers and Directors 
  as a group (9 persons)(6)           11,075,000                  100.0%                72.7% 
</TABLE>

- -----------------------------------------------------------------------------
*   less than 1 percent

(1) Shares beneficially owned and percentage of ownership are based on 
    10,000,000 shares of Common Stock outstanding before this offering and 
    14,150,000 shares of Common Stock outstanding after the closing. 
    Beneficial ownership is determined in accordance with the rules of the 
    SEC and generally includes voting and disposition power with respect to 
    securities. 

(2) All shares are held by Kos Holdings, Inc., which is wholly owned by Kos 
    Investments, Inc., of which Mr. Jaharis is the sole shareholder, and with 
    respect to such shares Mr. Jaharis has sole voting and investment power. 
    Excludes, at March 7, 1997, 893,000 shares of Common Stock issuable to Kos
    Investments upon the conversion, if any, of the Convertible Note. 

(3) Consists of 750,000 shares of Common Stock that may be purchased by Mr. 
    Bell pursuant to an option, which is currently exercisable. 

(4) Consists of 275,000 shares of Common Stock that may be purchased by Mr. 
    Bova pursuant to an option, which is currently exercisable. 

(5) Consists of 50,000 shares of Common Stock that may be purchased by Mr.
    Baldini pursuant to an option, which is exercisable within 60 days.

(6) Includes an aggregate of 1,075,000 shares underlying options to purchase
    Common Stock that are currently exercisable or are exercisable within 60
    days. 


                               47           
<PAGE>
                         DESCRIPTION OF CAPITAL STOCK 

   The authorized capital stock of the Company consists of 50,000,000 shares 
of Common Stock having a par value of $.01 per share and 10,000,000 shares of 
Preferred Stock having a par value of $.01 per share ("Preferred Stock"). As 
of March 7, 1997, 10,000,000 shares of Common Stock and no shares of 
Preferred Stock were outstanding. An additional 2,330,500 shares of Common 
Stock may be issued upon the exercise of outstanding stock options and an 
additional 893,000 shares of Common Stock issuable upon conversion, if any, of 
the Convertible Note. 

COMMON STOCK 

   Each holder of Common Stock is entitled to one vote for each share held. 
Shareholders do not have the right to cumulate their votes in elections of 
directors. Accordingly, holders of a majority of the issued and outstanding 
Common Stock will have the right to elect all the Company's directors and 
otherwise control the affairs of the Company. 

   Holders of Common Stock are entitled to dividends on a pro rata basis upon 
declaration of dividends by the Board of Directors. Dividends are payable 
only out of funds legally available for the payment of dividends. The Board 
of Directors is not required to declare dividends, and it currently expects 
to retain earnings to finance the development of the Company's business. See 
"Dividend Policy." 

   Upon a liquidation of the Company, holders of the Common Stock will be 
entitled to a pro rata distribution of the assets of the Company, after 
payment of all amounts owed to the Company's creditors, and subject to any 
preferential amount payable to holders of Preferred Stock of the Company, if 
any. Holders of Common Stock have no preemptive, subscription, conversion, 
redemption or sinking fund rights. 

PREFERRED STOCK 

   The Articles permit the Company's Board of Directors to issue shares of 
Preferred Stock in one or more series and to fix the relative rights, 
preferences and limitations of each series. Among such rights, preferences 
and limitations are dividend rates, provisions of redemption, rights upon 
liquidation, conversion privileges and voting powers. Should the Board of 
Directors elect to exercise this authority, the rights and privileges of 
holders of Common Stock could be made subject to the rights and privileges of 
any such series of Preferred Stock. The Board of Directors of the Company 
currently has no plans to issue any shares of Preferred Stock. The issuance 
of Preferred Stock could have the effect of making it more difficult for a 
third party to acquire, or discouraging a third party from acquiring, a 
majority of the outstanding voting stock of the Company. 

CERTAIN ANTI-TAKEOVER PROVISIONS INCLUDED IN THE COMPANY'S ARTICLES OF 
INCORPORATION AND BYLAWS 

   The Articles permit removal of directors only for cause by the 
shareholders of the Company at a meeting by the affirmative vote of at least 
60% of the outstanding shares entitled to vote for the election of directors 
(the "Voting Stock"). The Articles provide that any vacancy on the Board of 
Directors may be filled only by the remaining directors then in office. 

   The Articles also contain provisions which require: (i) the affirmative 
vote of 60% of the Voting Stock to amend the Articles of Incorporation or 
Bylaws of the Company; and (ii) the demand of not less than 50% of all votes 
entitled to be cast on any issue to be considered at a proposed special 
meeting to call a special meeting of shareholders. In addition, the Articles 
require that all shareholder action, including the election of directors, be 
taken by means of a vote at a duly convened shareholders meeting and not by 
use of written consents. 

   The Company's Bylaws establish an advance notice procedure for the 
nomination of candidates for election as directors by shareholders as well as 
for shareholder proposals to be considered at shareholders' meetings. 

                               48           
<PAGE>
   The above-described provisions may have certain anti-takeover effects. 
Such provisions, in addition to the provisions described below, may make it 
more difficult for persons, without the approval of the Company's Board of 
Directors, to make a tender offer or acquire substantial amounts of the 
Common Stock or launch other takeover attempts that a shareholder might 
consider in such shareholder's best interests, including attempts that might 
result in the payment of a premium over the market price for the Common Stock 
held by such shareholder. 

CERTAIN PROVISIONS OF FLORIDA LAW 

   The Company is subject to several anti-takeover provisions under Florida 
law that apply to a public corporation organized under Florida law, unless 
the corporation has elected to opt out of those provisions in its articles of 
incorporation or bylaws. The Company has not elected to opt out of certain of 
those provisions. The Florida Business Corporation Act (the "FBCA") prohibits 
the voting of shares in a publicly-held Florida corporation that are acquired 
in a "control share acquisition" unless the holders of a majority of the 
corporation's voting shares (exclusive of shares held by officers of the 
corporation, inside directors or the acquiring party) approve the granting of 
voting rights as to the shares acquired in the control share acquisition or 
unless the acquisition is approved by the corporation's board of directors. A 
"control share acquisition" is defined as an acquisition that immediately 
thereafter entitles the acquiring party to vote in the election of directors 
within each of the following ranges of voting power: (i) one-fifth or more 
but less than one-third of such voting power (ii) one-third or more but less 
than a majority of such voting power; and (iii) more than a majority of such 
voting power. 

   The FBCA also contains an "affiliated transaction" provision that 
prohibits a publicly-held Florida corporation from engaging in a broad range 
of business combinations or other extraordinary corporate transactions with 
an "interested shareholder" unless (i) the transaction is approved by a 
majority of disinterested directors before the person becomes an interested 
shareholder, (ii) the interested shareholder has owned at least 80% of the 
corporation's outstanding voting shares for at least five years or (iii) the 
transaction is approved by the holders of two-thirds of the corporation's 
voting shares other than those owned by the interested shareholder. An 
interested shareholder is defined as a person who together with affiliates 
and associates beneficially owns more than 10% of the corporation's 
outstanding voting shares. The Company's Articles provide that the FBCA's 
affiliated transaction voting requirements will not apply to the Company. 

TRANSFER AGENT AND REGISTRAR 

   American Stock Transfer & Trust Company has been appointed the transfer 
agent and registrar for the Common Stock. Its address is 40 Wall Street, 46th 
Floor, New York, New York 10005. 

                               49           
<PAGE>
                       SHARES ELIGIBLE FOR FUTURE SALE 

   Upon completion of this offering, the Company will have 14,150,000 shares 
of Common Stock outstanding. Of these shares, the 4,150,000 shares offered 
hereby will be freely tradeable without restriction or further registration 
under the Securities Act, except for any shares purchased by an "affiliate" 
of the Company (in general, a person who has a control relationship with the 
Company), which shares will be subject to the resale limitations, described 
below, of Rule 144 promulgated under the Securities Act. The remaining 
10,000,000 shares are deemed to be "restricted securities," as that term is 
defined under Rule 144, in that such shares were issued and sold by the 
Company in private transactions not involving a public offering and, as such, 
may only be sold pursuant to an effective registration under the Securities 
Act, in compliance with the exemption provisions of Rule 144 or pursuant to 
another exemption under the Securities Act (the "Restricted Shares"). The 
Restricted Shares are eligible for sale under Rule 144 (subject to certain 
recurring three-month volume limitations prescribed therein). The Company has 
granted certain registration rights to its sole shareholder and to Kos 
Investments, the holder of the note representing the Investments Loan. These 
entities have "piggyback" registration rights to request that the Company 
register any of their shares in the event that the Company proposes to 
register any of its securities under the Securities Act. Additionally, these 
entities have "demand" registration rights to have the Company prepare and 
file, on three occassions, a registration statement so as to permit a public 
offering and sale of their shares of Common Stock. 

   The existing shareholder of the Company, which will beneficially hold an
aggregate of 10,000,000 shares of Common Stock upon consummation of this
offering, holders of options to purchase an aggregate of 2,330,500 shares of
Common Stock, and Kos Investments, Inc., the holder of the Convertible Note,
which may be converted into 893,000 shares of Common Stock have agreed with the
Underwriters not to sell or otherwise dispose of any of those shares of Common
Stock for a period of 180 days after the date of this Prospectus without the
written consent of Cowen & Company, a Representative of the Underwriters. Cowen
& Company may, in its sole discretion and at any time without notice, release
all or any portion of the securities subject to these lock-up restrictions.

   In general, under Rule 144 as currently in effect, subject to the 
satisfaction of certain other conditions, a person, including an affiliate of 
the Company (or persons whose shares are aggregated with an affiliate), who 
has owned restricted shares of Common Stock beneficially for at least two 
years is entitled to sell, within any three-month period, a number of shares 
that does not exceed the greater of 1% of the total number of outstanding 
shares of the same class or, if the common stock is quoted on Nasdaq National 
Market, the average weekly trading volume during the four calendar weeks 
preceding the sale. A person who has not been an affiliate of the Company for 
at least three months immediately preceding the sale and who has beneficially 
owned shares of Common Stock for at least three years is entitled to sell 
such shares under Rule 144 without regard to any of the limitations described 
above. The Securities and Exchange Commission is currently considering a 
proposal to reduce the Rule 144 holding period for restricted securities to 
one year. 

   The Company intends to file a registration statement under the Securities 
Act to register shares of Common Stock reserved for issuance under the Option 
Plan, thereby permitting the resale of such shares by non-affiliates in the 
public market without restriction under the Securities Act. As of December 
31, 1996, options to purchase 2,005,500 shares of Common Stock were 
outstanding under the Option Plan. 

   Prior to this offering, there has been no public market for the securities 
of the Company. No prediction can be made as to the effect, if any, that 
public sales of shares of Common Stock or the availability of such shares for 
sale will have on the market prices of the Common Stock prevailing from time 
to time. Nevertheless, sales of a substantial number of shares by the 
existing shareholder or by shareholders purchasing Common Stock in this 
offering could have a negative effect on the market price of Common Stock and 
could impair the Company's ability in the future to raise additional capital 
through the sale of its equity securities. 

                               50           
<PAGE>
                                 UNDERWRITING 

   Subject to the terms and conditions of the Underwriting Agreement, the 
Underwriters named below (the "Underwriters"), through their Representatives, 
Cowen & Company, Dillon, Read & Co. Inc. and Salomon Brothers Inc have 
severally agreed to purchase from the Company the following respective number 
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 SHARES 
UNDERWRITER                                            OF COMMON STOCK 
- -----------------------------                          ----------------   
<S>                                                       <C>
Cowen & Company .......................................   856,000
Dillon, Read & Co. Inc.................................   856,000
Salomon Brothers Inc ..................................   856,000
Bear, Stearns & Co. Inc................................    83,000
Alex. Brown & Sons Incorporated........................    83,000
Credit Suisse First Boston Corporation.................    83,000
Donaldson, Lufkin & Jenrette Securities Corporation....    83,000
Hambrecht & Quist LLC..................................    83,000
Lazard Freres & Co. LLC................................    83,000
Lehman Brothers Inc....................................    83,000
Morgan Stanley & Co., Incorporated.....................    83,000
Oppenheimer & Co., Inc.................................    83,000
Paine Webber Incorporated..............................    83,000
Prudential Securities Incorporated.....................    83,000
Schroder Wertheim & Co. Incorporated...................    83,000
UBS Securities LLC.....................................    83,000
Invemed Associates, Inc................................    83,000
Allen & Company Incorporated...........................    42,000
Brean Murray & Co., Inc................................    42,000
Furman Selz LLC........................................    42,000 
Genesis Merchant Group Securities......................    42,000
Gruntal & Co., Incorporated............................    42,000
Nesbitt Burns Securities Inc...........................    42,000
Raymond James & Associates, Inc........................    42,000
Scott & Stringfellow, Inc..............................    42,000
Vector Securities International, Inc...................    42,000
Volpe, Welty & Company LLC.............................    42,000
                                                        ---------    
  Total ............................................... 4,150,000
                                                        =========         
</TABLE>

   The Underwriting Agreement provides that the obligations of the 
Underwriters are subject to certain conditions precedent, including the 
absence of any material adverse change in the Company's business and the 
receipt of certain certificates, opinions and letters from the Company and 
its counsel and independent auditors. The nature of the Underwriter's 
obligation is such that they are committed to purchase all shares of Common 
Stock offered hereby if any of such shares are purchased. 

   The Underwriters propose to offer the shares of Common Stock directly 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 
is excess of $0.59 per share. The Underwriters may allow and such dealers may 
re-allow a concession not in excess of $0.10  per share to certain other 
dealers. The Underwriters have informed the Company that they do not intend 
to confirm sales to any accounts over which they exercise discretionary 
authority. After the initial public offering of the shares, the offering 
price and other selling terms may from time to time be varied by the 
Underwriters. 

   The Company has granted to the Underwriters an option, exercisable no 
later than 30 days after the date of this Prospectus, to purchase up to 
622,500 additional shares of Common Stock at the initial public offering 
price, less the underwriting discount, set forth on the cover page of this 
Prospectus, to cover over-allotments, if any. If the Underwriters exercise 
their over-allotment option, the Underwriters have severally agreed, subject 
to certain conditions, to purchase approximately the same percentage thereof 
that the number of shares of Common Stock to be purchased by each of them 
shown in the foregoing table bears to the total number of shares of Common 
Stock offered hereby. The Underwriters may exercise such option only to cover 
over-allotments made in connection with the sale of share of Common Stock 
offered hereby. 


   In connection with the offering, the Underwriters may engage in transactions
that stabilize, maintain or otherwise affect the price of the Common Stock.
Specifically, the Underwriters may overallot. In addition, the Underwriters may
bid for, and purchase, shares of Common Stock in the open market to cover
syndicate short positions created in connection with the offering or to
stabilize the price of the Common Stock. Finally, the underwriting syndicate may
reclaim selling concessions allowed for distributing the Common Stock in this
offering, if the syndicate repurchases previously distributed Common Stock in
syndicate covering transactions, in stabilization transactions or otherwise.
Any of these activities may stabilize or maintain the market price of the
Common Stock above independent market levels. The Underwriters are not required
to engage in these activities, and may end any of these activities at anytime.


   Each of the Company, its sole shareholder and the Company's directors, 
officers and key personnel who hold options to purchase shares of Common 
Stock, holding in the aggregate 12,330,500 shares or options to purchase 
shares of Common Stock, and the holder of the Convertible Note have agreed 
that they will not during the period commenced on the date hereof and ending 
180 days after the date of this Prospectus, without the prior written consent 
of Cowen & Company, (i) directly or indirectly, offer, sell, assign, 
transfer, encumber, pledge, contract to sell, grant an option to purchase or 
otherwise dispose of, other than by operation of law, any shares of Common 
Stock (other than the shares offered hereby and, in the case of the Company, 
in certain limited circumstances), options, rights or warrants to acquire 
shares of Common Stock, or securities convertible into or exercisable or 
exchangeable for shares of Common Stock (whether such shares or any such 
securities are now owned or hereafter acquired) or (ii) enter into any swap 
or other arrangement that transfers to another, any of the economic 
consequences of ownership of the Common Stock, whether any such transaction 
described in clause (i) 

                               51           
<PAGE>
or (ii) above is to be settled by delivery of Common Stock or such other 
securities, in cash or otherwise. The foregoing lockup would prohibit, 
without the prior written consent of Cowen & Company, the sale by Mr. Jaharis 
of any direct or indirect interest in Kos Investments, or by Kos Investments 
of any direct or indirect interest in Kos Holdings. 

   The Company has agreed to indemnify the Underwriters against certain 
liabilities, including liabilities under the Securities Act, and to 
contribute to payments the Underwriters may be required to make in respect 
thereof. 

   Prior to this offering, there has been no public market for the Common Stock.
The initial public offering price for the Common Stock was determined by
negotiation among the Company and the Representatives. The factors considered in
determining the initial public offering price were prevailing market and
economic conditions, the revenues and earnings of the Company, market valuations
of other companies engaged in activities similar to the Company, estimates of
the business potential and prospects of the Company, the present state of the
Company's business operations and the Company's management.

                                LEGAL MATTERS 


   The validity of the shares of Common Stock offered hereby is being passed
upon for the Company by Holland & Knight LLP, One East Broward Boulevard, Suite
1300, Fort Lauderdale, Florida 33301. Holland & Knight LLP has also provided
advice to the Company with respect to certain intellectual property matters.
Certain matters are being passed upon for the Underwriters by Davis Polk &
Wardwell, 450 Lexington Avenue, New York, New York 10017.


                                   EXPERTS 

   The consolidated financial statements included in this prospectus and this 
registration statement have been audited by Arthur Andersen LLP, independent 
certified public accountants, as indicated in their report with respect 
thereto, and are included herein in reliance upon the authority of said firm, 
as experts in giving said report. 


                               52           
<PAGE>
                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 

                  INDEX TO CONSOLIDATED FINANCIAL STATEMENTS 

<TABLE>
<CAPTION>
                                                                                                   PAGE 
                                                                                                ---------
<S>                                                                                             <C>
Report of Independent Certified Public Accountants ...........................................     F-2 

Financial Statements: 

Consolidated Balance Sheets at June 30, 1995 and 1996 and December 31, 1996 (unaudited)  .....     F-3 

Consolidated Statements of Operations for the year ended June 30, 1994, 1995 and 1996 and the 
  period July 1, 1988 (inception) to June 30, 1996 and for the six months ended December 31, 
  1995 and 1996 (unaudited) and for the period from July 1, 1988 (inception) to December 31, 
  1996 (unaudited) ...........................................................................     F-4 

Consolidated Statements of Shareholder's Equity (Deficit) for the period July 1, 1988 (incep-
  tion) to June 30, 1996 and for the six months ended December 31, 1996 (unaudited) ..........     F-5 

Consolidated Statements of Cash Flows for the year ended June 30, 1994, 1995 and 1996 and for 
  the period ended July 1, 1988 (inception) to June 30, 1996 and for the six months ended De-
  cember 31, 1995 and 1996 (unaudited) and for the period from July 1, 1988 (inception) to De-
  cember 31, 1996 (unaudited) ................................................................     F-6 

Notes to Consolidated Financial Statements ...................................................     F-7 
</TABLE>

                                       F-1
<PAGE>
              REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS 

To the Board of Directors of 
 Kos Pharmaceuticals, Inc.: 

   We have audited the accompanying consolidated balance sheets of Kos 
Pharmaceuticals, Inc. (a development stage corporation and wholly-owned 
subsidiary of Kos Holdings, Inc.) and subsidiary as of June 30, 1995 and 
1996, and the related consolidated statements of operations, shareholder's 
equity (deficit) and cash flows for each of the three years in the period 
ended June 30, 1996 and for the cumulative period from inception (July 1, 
1988) to June 30, 1996. These consolidated financial statements are the 
responsibility of the Company's management. Our responsibility is to express 
an opinion on these consolidated 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 consolidated financial statements referred to above 
present fairly, in all material respects, the consolidated financial position 
of Kos Pharmaceuticals, Inc. and subsidiary as of June 30, 1995 and 1996, and 
the results of their operations and their cash flows for each of the three 
years in the period ended June 30, 1996, and for the cumulative period from 
inception (July 1, 1988) to June 30, 1996, in conformity with generally 
accepted accounting principles. 

ARTHUR ANDERSEN LLP 

Miami, Florida, 
 July 15, 1996, (except with respect to the 
 matters discussed in Note 7, as to which 
 the date is February 7, 1997). 

                                       F-2
<PAGE>
<TABLE>
<CAPTION>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
(A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY OF KOS HOLDINGS, INC.) 
                         CONSOLIDATED BALANCE SHEETS 

                                                            JUNE 30,                DECEMBER 31, 
                                                --------------------------------  ---------------
                                                      1995             1996             1996 
                                                --------------- ---------------  ---------------
                                                                                     (UNAUDITED) 
<S>                                             <C>              <C>               <C>
ASSETS 
Current Assets: 
 Cash and cash equivalents ...................    $     40,973     $    193,484     $    357,520 
 Prepaid expenses and other current assets  ..          78,205          165,392          233,841 
                                                --------------- ---------------  ---------------
  Total current assets .......................         119,178          358,876          591,361 
Fixed Assets, net ............................       2,235,456        1,921,943        2,605,404 
                                                --------------- ---------------  ---------------
  Total assets ...............................    $  2,354,634     $  2,280,819     $  3,196,765 
                                                ===============  ===============   =============== 
LIABILITIES AND SHAREHOLDER'S EQUITY 
  (DEFICIT) 
  Current Liabilities: 
   Accounts payable ..........................    $    751,352     $    195,299     $    515,595 
 Accrued expenses ............................         496,790          171,371          536,409 
 Loan from Kos Investments, Inc. .............              --               --        8,355,000 
                                                --------------- ---------------  ---------------
  Total current liabilities ..................       1,248,142          366,670        9,407,004 
                                                --------------- ---------------  ---------------
Minority Interest ............................         163,869               --               --
                                                --------------- ---------------  ---------------
Commitments and Contingencies (Note 5) 
Shareholder's Equity (Deficit): 
 Common stock, $.01 par value, 50,000,000 
   shares authorized, 10,000,000 shares issued 
   and outstanding ...........................         100,000          100,000          100,000 
 Preferred stock, $.01 par value, 10,000,000 
   shares authorized, none issued and 
   outstanding ...............................              --               --               --
 Additional paid-in capital ..................      36,507,000       58,472,323       58,472,323 
 Deficit accumulated in the development stage      (35,664,377)     (56,658,174)     (64,782,562) 
                                                --------------- ---------------  ---------------
  Total shareholder's equity (deficit)  ......         942,623        1,914,149       (6,210,239) 
                                                --------------- ---------------  ---------------
  Total liabilities and shareholder's 
    equity (deficit) .........................    $  2,354,634     $   2,280,819    $  3,196,765 
                                                ===============  ===============   =============== 
</TABLE>

THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS. 

                                       F-3
<PAGE>
<TABLE>
<CAPTION>
                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
(A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY OF KOS HOLDINGS, INC.) 
                    CONSOLIDATED STATEMENTS OF OPERATIONS 

                                                  FOR THE YEAR ENDED JUNE 30, 
                                      ---------------------------------------------------
                                            1994             1995               1996 
                                      --------------- ----------------  ----------------

<S>                                   <C>              <C>                <C>
Revenues ...........................    $    22,461      $     14,300       $         --
                                      --------------- ----------------  ----------------
Expenses: 
 Research and development ..........      6,662,626         8,386,872         13,815,776 
 General and administrative  .......      1,619,038         1,613,832          1,772,060 
 Expense recognized on 
   modification of stock option 
   grants (Note 6) .................             --                --          5,436,000 
                                      --------------- ----------------  ----------------
                                          8,281,664        10,000,704         21,023,836 
                                      --------------- ----------------  ----------------
Other (Income) Expense: 
 Other income ......................         (1,687)               --                --
 Interest (income) expense, net  ...      1,058,029         1,025,559            (13,860) 
 Interest expense-related parties  .         50,010            26,898                 --
                                      --------------- ----------------  ----------------
  Total other (income) expense  ....      1,106,352         1,052,457            (13,860) 
                                      --------------- ----------------  ----------------
  Loss before minority interest  ...     (9,365,555)      (11,038,861)       (21,009,976) 
Minority Interest ..................       (164,401)              532             16,179 
                                      --------------- ----------------  ----------------
  Net loss .........................    $(9,529,956)     $(11,038,329)      $(20,993,797) 
                                      ===============  ================   ================ 
Net loss per Share .................    $     (0.84)     $      (0.97)      $      (1.85) 
                                      ===============  ================   ================ 
Weighted Average Shares of Common 
  Stock Outstanding ................     11,340,000        11,340,000         11,340,000  
                                      ===============  ================   ================ 
</TABLE>

                    (RESTUBBED TABLE CONTINUED FROM ABOVE) 

<TABLE>
<CAPTION>
                                         CUMULATIVE 
                                           PERIOD                  SIX MONTHS 
                                       FROM INCEPTION                ENDED                  JULY 1, 1988 
                                       (JULY 1, 1988)             DECEMBER 31,             (INCEPTION) TO 
                                        TO JUNE 30,   --------------------------------       DECEMBER 31, 
                                            1996            1995             1996              1996        
                                      --------------- -------------------------------- ----------------
                                                                  (UNAUDITED)               (UNAUDITED) 
<S>                                   <C>              <C>               <C>              <C>
Revenues ...........................    $     36,761     $        --      $         --     $      36,761 
                                      --------------- ---------------  --------------- ----------------
Expenses: 
 Research and development ..........      38,705,510       6,426,071         6,056,677        44,762,187 
 General and administrative  .......       8,871,358         788,842         1,936,611        10,807,969 
 Expense recognized on 
   modification of stock option 
   grants (Note 6) .................       5,436,000              --                --         5,436,000 
                                      --------------- ---------------  --------------- ----------------
                                          53,012,868       7,214,913         7,993,288        61,006,156 
                                      --------------- ---------------  --------------- ----------------
Other (Income) Expense: 
 Other income ......................         (10,103)             --                --           (10,103) 
 Interest (income) expense, net  ...       3,413,997          (7,718)           (5,182)        3,408,815 
 Interest expense-related parties  .         130,483              --           136,282           266,765 
                                      --------------- ---------------  --------------- ----------------
  Total other (income) expense  ....       3,534,377          (7,718)          131,100         3,665,477 
                                      --------------- ---------------  --------------- ----------------
  Loss before minority interest  ...     (56,510,484)     (7,207,195)       (8,124,388)      (64,634,872) 
Minority Interest ..................        (147,690)            837                --          (147,690) 
                                      --------------- ---------------  --------------- ----------------
  Net loss .........................    $ (56,658,174)   $(7,206,358)      $(8,124,388)     $(64,782,562) 
                                      ===============  ===============   ===============  ================ 
Net loss per Share .................    $      (5.00)    $     (0.64)      $     (0.72)     $      (5.71) 
                                      ===============  ===============   ===============  ================ 
Weighted Average Shares of Common 
  Stock Outstanding ................      11,340,000      11,340,000        11,340,000        11,340,000  
                                      ===============  ===============   ===============  ================ 
</TABLE>

THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS. 

                                       F-4
<PAGE>
<TABLE>
<CAPTION>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
(A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY OF KOS HOLDINGS, INC.) 
          CONSOLIDATED STATEMENTS OF SHAREHOLDER'S EQUITY (DEFICIT) 

                                                                           DEFICIT 
                                                                         ACCUMULATED 
                                                        ADDITIONAL          IN THE 
                                            COMMON        PAID-IN        DEVELOPMENT 
                                            STOCK         CAPITAL           STAGE             TOTAL 
                                         ----------- --------------  ---------------- ---------------
<S>                                      <C>          <C>              <C>               <C>
Issuance of common stock ..............    $100,000     $        --     $         --    $    100,000 
Capital contributions from Parent  ....          --        390,000                --         390,000 
Net loss ..............................          --             --         (621,814)        (621,814) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1989 ..............     100,000         390,000        (621,814)        (131,814) 
Net loss ..............................          --             --       (1,389,932)      (1,389,932) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1990 ..............     100,000         390,000      (2,011,746)      (1,521,746) 
Net loss ..............................          --             --       (2,445,506)      (2,445,506) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1991 ..............     100,000         390,000      (4,457,252)      (3,967,252) 
Net loss ..............................          --             --       (3,893,185)      (3,893,185) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1992 ..............     100,000         390,000      (8,350,437)      (7,860,437) 
Net loss ..............................          --             --       (6,745,655)      (6,745,655) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1993 ..............     100,000         390,000     (15,096,092)     (14,606,092) 
Net loss ..............................          --             --       (9,529,956)      (9,529,956) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1994 ..............     100,000         390,000     (24,626,048)     (24,136,048) 
Capital contributions from Parent  ....          --       5,745,000              --        5,745,000 
Assumption of note payable by Parent  .          --      30,372,000              --       30,372,000 
Net loss ..............................          --             --      (11,038,329)     (11,038,329) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1995 ..............     100,000      36,507,000     (35,664,377)         942,623 
Capital contributions from Parent  ....          --      16,381,633              --       16,381,633 
Modification of options (Note 6)  .....          --       5,436,000              --        5,436,000 
Contribution of minority interest  ....          --         147,690              --          147,690 
Net loss ..............................          --              --     (20,993,797)     (20,993,797) 
                                         ----------- --------------  ---------------- ---------------
Balance at June 30, 1996 ..............     100,000      58,472,323     (56,658,174)       1,914,149 
Net loss (unaudited) ..................          --             --       (8,124,388)      (8,124,388) 
                                         ----------- --------------  ---------------- ---------------
Balance at December 31, 1996 
(unaudited) ...........................    $100,000     $58,472,323    $(64,782,562)    $ (6,210,239) 
                                         ===========  ==============   ================  =============== 
</TABLE>

THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS. 

                                       F-5
<PAGE>
<TABLE>
<CAPTION>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
(A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY OF KOS HOLDINGS, INC.) 
                    CONSOLIDATED STATEMENTS OF CASH FLOWS 

                                                 FOR THE YEAR ENDED JUNE 30, 
                                        ---------------------------------------------
                                             1994           1995             1996 
                                        ------------- --------------  --------------

<S>                                     <C>            <C>              <C>
Cash Flows from 
  Operating Activities: 
   Net loss ..........................   $(9,529,956)   $(11,038,329)    $(20,993,797) 
 Adjustments to reconcile net loss to 
   net cash used in operating 
   activities--
     Depreciation and amortization ...       260,053         409,528          522,288 
  Minority interest ..................       164,401            (532)         (16,179) 
  Compensation recognized on 
    modification of stock option 
    grants ...........................            --              --        5,436,000 
  Changes in operating assets and 
    liabilities: 
   Prepaid expenses and other 
     current assets ..................       (92,203)         55,729          (87,187) 
   Accounts payable ..................      (310,472)        130,011         (556,053) 
   Accrued expenses ..................       514,469         362,359         (325,419) 
                                        ------------- --------------  --------------
    Net cash used in operating 
      activities .....................    (8,993,708)    (10,081,234)     (16,020,347) 
                                        ------------- --------------  --------------
Cash Flows from 
  Investing Activities: 
   Capital expenditures ..............    (1,051,152)     (1,223,221)        (208,775) 
                                        ------------- --------------  --------------
Cash Flows from 
  Financing Activities: 
   Proceeds from issuance of common 
    stock  ...........................            --              --               --
 Capital contributions received from 
   Parent ............................            --       5,745,000       16,381,633 
 Borrowings under note payable  ......    10,050,000       5,582,000               --
 Borrowings under loan from Kos 
   Investments, Inc. .................            --              --               --
                                        ------------- --------------  --------------
    Net cash provided by financing 
      activities .....................    10,050,000      11,327,000       16,381,633 
                                        ------------- --------------  --------------
    Net increase (decrease) in cash  .         5,140          22,545          152,511 
Cash and Cash Equivalents, beginning 
  of period ..........................        13,288          18,428           40,973 
                                        ------------- --------------  --------------
Cash and Cash Equivalents, 
  end of period ......................   $    18,428    $      40,973    $    193,484 
                                        =============  ==============   ============== 
Supplemental Disclosure of 
  Cash Flow Information: 
   Interest paid .....................   $   728,537    $  1,387,377     $         --
                                        =============  ==============   ============== 
Supplemental Disclosure of Noncash 
  Information: 
   Transfer of note payable to Parent    $        --   $  30,372,000    $          --
                                        =============  ==============   ============== 
 Contribution of minority interest 
   to paid-in capital ................   $        --   $          --    $     147,690 
                                        =============  ==============   ============== 
</TABLE>
<PAGE>
                    (RESTUBBED TABLE CONTINUED FROM ABOVE) 

<TABLE>
<CAPTION>
                                           CUMULATIVE 
                                             PERIOD                SIX MONTHS            JULY 1, 1988 
                                         FROM INCEPTION              ENDED               (INCEPTION) TO
                                         (JULY 1, 1988)           DECEMBER 31,            DECEMBER 31, 
                                          TO JUNE 30,    -----------------------------   ---------------
                                              1996            1995            1996            1996 
                                        --------------- -------------    -------------   ---------------
                                                                  (UNAUDITED)            (UNAUDITED) 
<S>                                     <C>              <C>             <C>            <C>
Cash Flows from 
  Operating Activities: 
   Net loss ..........................    $(56,658,174)   $(7,206,358)    $(8,124,388)   $(64,782,562) 
 Adjustments to reconcile net loss to 
   net cash used in operating 
   activities--
     Depreciation and amortization ...       1,589,747        261,907         279,280       1,869,027 
  Minority interest ..................         147,690           (838)             --         147,690 
  Compensation recognized on 
    modification of stock option 
    grants ...........................       5,436,000             --              --       5,436,000 
  Changes in operating assets and 
    liabilities: 
       Prepaid expenses and other 
        current assets  ..............        (165,392)       (75,201)        (68,449)       (233,841) 
   Accounts payable ..................         195,299       (385,996)        320,296         515,595 
   Accrued expenses ..................         171,371       (381,703)        365,038         536,409 
                                        --------------  -------------   -------------   -------------
    Net cash used in operating 
      activities .....................     (49,283,459)    (7,788,189)     (7,228,223)    (56,511,682) 
                                        --------------  -------------   -------------   -------------
Cash Flows from 
  Investing Activities: 
   Capital expenditures ..............      (3,511,690)       (23,353)       (962,741)     (4,474,431) 
                                        --------------    -----------    ------------   -------------
Cash Flows from 
  Financing Activities: 
   Proceeds from issuance of common 
    stock  ...........................         490,000             --              --         490,000 
 Capital contributions received from 
   Parent ............................      22,126,633      8,000,000              --      22,126,633 
 Borrowings under note payable  ......      30,372,000             --              --      30,372,000 
 Borrowings under loan from Kos 
   Investments, Inc. .................              --             --       8,355,000       8,355,000 
                                        --------------   ------------    ------------   -------------
    Net cash provided by financing 
      activities .....................      52,988,633      8,000,000       8,355,000      61,343,633 
                                        ---------------  ------------    ------------   -------------
    Net increase (decrease) in cash  .         193,484        188,458         164,036         357,520 
Cash and Cash Equivalents, beginning 
  of period ..........................              --         40,973         193,484              --
                                        --------------   ------------    ------------   -------------
Cash and Cash Equivalents, 
  end of period ......................    $    193,484    $   229,431     $   357,520    $    357,520 
                                        ==============   ============    ============   =============  
Supplemental Disclosure of 
  Cash Flow Information: 
   Interest paid .....................    $  3,476,267    $        --    $         --    $  3,476,267 
                                        ==============   ============    =============  =============  
Supplemental Disclosure of Noncash 
  Information: 
   Transfer of note payable to Parent     $ 30,372,000    $        --    $         --    $ 30,372,000 
                                        ==============   ============    ============   =============  
 Contribution of minority interest 
   to paid-in capital ................    $    147,690    $        --    $         --    $    147,690 
                                        ==============   ============    ============   =============  
</TABLE>

THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE FINANCIAL STATEMENTS. 

                                       F-6
<PAGE>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

1. GENERAL 

   The predecessor to Kos Pharmaceutical's, Inc. (the "Company"), Kos 
Holdings, Inc. ("Holdings") was incorporated in Florida on July 1, 1988 to 
develop prescription pharmaceutical products principally for the 
cardiovascular and respiratory markets. On June 25, 1996, the Company was 
incorporated in Florida as the successor to the business of Holdings. On June 
30, 1996, all of the assets and all of the liabilities of Holdings, other 
than its net operating loss carryforwards, were transferred to the Company in 
exchange for shares of common stock of the Company (the "Reorganization"). 
The Reorganization was accomplished in order to transfer the assets and 
operations of Holdings to the Company while preserving Holdings' net 
operating losses and related federal tax benefits for Holdings and its sole 
shareholder and one of its founders. Kos Investments, Inc. ("Investments") is 
the sole shareholder of Holdings. As this transaction was between entities 
under common control, the transaction was accounted for on a historical cost 
basis, in a manner similar to a pooling of interests. 


   On June 22, 1993, Holdings and Aeropharm Technology, Inc. ("Aeropharm")
entered into a letter of intent for the purchase of a controlling interest in
Aeropharm. On February 14, 1995, the transaction was completed through a stock
purchase agreement that gave control (80% ownership) of Aeropharm to Holdings.
Holdings accounted for its investment in Aeropharm as a consolidated subsidiary
from June 22, 1993. On June 20, 1996, Holdings acquired the minority interest in
Aeropharm, held by an employee of Aeropharm, in exchange for options to purchase
50,000 shares of common stock, at $7.00 per share, the estimated fair value of
the underlying shares at the date of grant. The acquisition of the minority
interest in Aeropharm was accounted for under the purchase method and the fair
value of the options granted approximated the carrying value ($147,690) of the
minority interest.


   On May 6, 1996, the Company submitted a New Drug Application ("NDA") to 
the U.S. Food and Drug Administration ("FDA") for, NIASPAN, its first 
cardiovascular product. NIASPAN is a once-a-day, oral, solid dose 
controlled-release formulation of niacin for the treatment of hyperlipidemia, 
a multiple lipid disorder that is a primary risk factor for coronary heart 
disease. Niacin is a water soluble vitamin that has long been recognized as 
an effective pharmacological agent for the treatment of multiple lipid 
disorders including elevated LDL and low HDL. The Company has conducted 
extensive pharmacokinetic studies and three double-blinded, placebo 
controlled pivotal trials in support of the NDA filing. 

   The Company expects to incur substantial additional losses in the near 
term primarily due to research and development activities and the 
commencement of sales and marketing efforts associated with NIASPAN. To date, 
the Company has not marketed any products. Future revenues, if any, are 
expected to be generated from sales of products. No assurance can be given 
that the Company's product development efforts will be successfully 
completed, that required regulatory approvals will be obtained, that products 
under development can be manufactured at acceptable cost and with appropriate 
quality or that any products can be successfully marketed. The Company is 
subject to a number of other risks including, but not limited to, 
uncertainties related to FDA approval of NIASPAN, uncertainties related to 
market acceptance, uncertainties related to patents and trademarks, 
interference and risk of infringement, uncertainties related to limited sales 
and marketing experience, uncertainties related to competition and 
technological changes, government regulation and no assurances of regulatory 
approval, dependence on Fuisz Technologies Ltd. and other collaborations, 
limited manufacturing experience and risk of scale-up, future capital needs 
and uncertainty of additional funding, dependence on single sources of 
supply, and no assurances of adequate third party reimbursement. 

   Management is actively pursuing an initial public offering of its common 
stock to finance operations of the Company. In addition, the Company 
continuously evaluates licensing agreements, joint development agreements and 
other transactions that may result in fees or revenues to the 

                                F-7           
<PAGE>


                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)

1. GENERAL--(CONTINUED)

Company. The likelihood of the success of the Company must be considered in 
light of the uncertainty caused by problems, expenses, complications and 
delays frequently encountered in connection with the development of new 
business ventures. 

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 

 BASIS OF PRESENTATION: 

   The consolidated financial statements include the results of Holdings 
(prior to July 1, 1996), the Company and its subsidiary, Aeropharm. All 
significant intercompany accounts and transactions have been eliminated in 
consolidation. 

 CASH AND CASH EQUIVALENTS: 

   For the purpose of the consolidated statements of cash flows, the Company 
considers all highly liquid investments with an original maturity of three 
months or less at the time of purchase to be cash and cash equivalents. As of 
June 30, 1995 and 1996, and December 31, 1996, the Company had no cash 
equivalents. 

 MINORITY INTEREST: 

   Minority interest represents the minority shareholder's interest in the 
shareholders' equity and net loss of Aeropharm. As of June 30, 1996, the 
Company owned 100% of Aeropharm, therefore, no minority interest is 
reflected. 

 FAIR VALUE OF FINANCIAL INSTRUMENTS: 

   As of June 30, 1995 and 1996, and December 31, 1996, the carrying amount 
of cash and cash equivalents, prepaid expenses and other current assets, 
accounts payable and accrued expenses approximates fair value due to the 
short term nature of these accounts. 

 CONCENTRATION OF CREDIT RISK: 

   The Company has no significant off balance sheet concentrations of credit 
risk. 

 DEPRECIATION AND AMORTIZATION: 

   Fixed assets are stated at cost, less accumulated depreciation and 
amortization. Depreciation and amortization are provided using the 
straight-line method over the estimated useful lives of the assets or lease 
term, if shorter, as follows: 

                                                     YEARS 
                                              -------------------
Furniture and equipment ....................          3-7 
Computer software and hardware .............          3-5 
Laboratory and manufacturing equipment  ....          3-5 
Leasehold improvements .....................      Life of lease 

 RESEARCH AND DEVELOPMENT EXPENSES: 

   All research and development expenses are reflected in the Company's 
consolidated statements of operations as incurred. 

 LOSS PER SHARE: 

   Loss per share is determined by dividing the net loss attributable to 
holders of the Company's common stock by the weighted average number of 
shares of common stock and dilutive common stock 

                                       F-8
<PAGE>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)


2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES--(CONTINUED)

equivalents outstanding after applying the treasury stock method. Common 
stock equivalents include the impact of the issuance of options (see Note 6) 
issued within one year prior to the date of the Company's initial public 
offering (see Note 7) at exercise prices less than the assumed initial 
offering price, whether or not the effects are antidilutive. 

 INTERIM FINANCIAL DATA: 

   In the opinion of the management of the Company, the accompanying 
unaudited consolidated financial statements contain all adjustments 
(consisting of only normal recurring adjustments) necessary to present fairly 
the financial position of the Company as of December 31, 1996, and the 
results of operations for the six month periods ended December 31, 1995 and 
1996. The results of operations and cash flows for the six month period ended 
December 31, 1996 are not necessarily indicative of the results of operations 
or cash flows which may be reported for the remainder of fiscal 1997. 

 INCOME TAXES: 

   The Company follows the Statement of Financial Accounting Standards No. 
109, "Accounting for Income Taxes," which requires, among other things, 
recognition of future tax benefits measured at enacted rates attributable to 
deductible temporary differences between financial statement and income tax 
bases of assets and liabilities and to tax net operating loss carryforwards 
to the extent that realization of said benefits is more likely than not. As 
the net operating loss carryforwards, amounting to approximately $51,000,000, 
as of the Reorganization were not transferred to the Company, the Company has 
no deferred tax assets or liabilities as of June 30, 1996. Any operating 
losses generated by the Company after June 30, 1996 will be available to 
offset future net income, if any. 

 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 reported amounts of assets and liabilities and 
disclosure of contingent assets and liabilities at the date of the financial 
statements and the reported amounts of revenues and expenses during the 
reporting period. Actual results could differ from those estimates. 

 NEW ACCOUNTING PRONOUNCEMENTS: 

   In March 1995, the Financial Accounting Standards Board issued Statement 
of Financial Accounting Standards No. 121, "Accounting for the Impairment of 
Long-Lived Assets and for Long-Lived Assets to Be Disposed Of" ("SFAS No. 
121"). SFAS No. 121 will apply to the Company for the fiscal year ending June 
30, 1997. The Company does not believe that SFAS No. 121 would have had a 
material effect on its financial position or the results of its operations 
had it been applied in the fiscal year ended June 30, 1996. 

   In October 1995, the Financial Accounting Standards Board issued SFAS No. 
123, "Accounting for Stock-Based Compensation" ("SFAS No. 123"). SFAS No. 123 
applies to transactions with non-employees after December 15, 1995. The 
compensation expense recognized for stock option modifications for options 
held by consultants in fiscal 1996, as more fully described in Note 6, was 
reflected under the provisions of SFAS 123. SFAS No. 123 will apply to 
transactions with employees in fiscal 1997. As the Company intends to 
continue applying the provision of APB 25 for transactions with employees, as 
permitted by SFAS No. 123, the Company does not believe that SFAS No. 123 
will have a material effect on its financial position or the results of its 
operations. 

                                       F-9
<PAGE>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)

3. FIXED ASSETS 

   Fixed assets consist of the following: 

<TABLE>
<CAPTION>
                                                            JUNE 30,               DECEMBER 31, 
                                                 ------------------------------  --------------
                                                      1995            1996             1996 
                                                 -------------- --------------  --------------
                                                                                   (UNAUDITED) 
<S>                                              <C>             <C>              <C>
Furniture and equipment .......................    $   246,510    $    297,131    $    310,284 
Computer software and hardware ................        323,094         399,847         469,105 
Laboratory and manufacturing equipment  .......      1,979,922       2,055,423       2,376,250 
Leasehold improvements ........................        753,389         759,289       1,318,792 
                                                 -------------- --------------  --------------
                                                     3,302,915       3,511,690       4,474,431 
Less-Accumulated depreciation and amortization      (1,067,459)     (1,589,747)     (1,869,027) 
                                                 -------------- --------------  --------------
  Fixed assets, net ...........................    $ 2,235,456     $ 1,921,943     $ 2,605,404 
                                                 ==============  ==============   ============== 
</TABLE>

4. NOTE PAYABLE 

   Michael Jaharis, the sole shareholder of Investments, has personally 
guaranteed the repayment of a loan to Investments from certain financial 
institutions. Prior to March 21, 1995, the Company was the primary borrower 
under this loan, and therefore received the benefit of the personal guaranty 
extended by Mr. Jaharis. As consideration for Mr. Jaharis' personal guaranty, 
the Company agreed to pay Mr. Jaharis an annual fee of 0.25% of the average 
amount outstanding under the loan during the Company's fiscal year. The 
Company paid Mr. Jaharis $28,700 and $92,333 during the fiscal years ended 
June 30, 1994 and 1995, respectively. In March 1995, the Company was released 
as a borrower under the loan. The assumption of the note payable to bank has 
been accounted for as a transfer to Investments and is reflected as an 
increase in "Additional paid-in capital" in the accompanying 1995 
consolidated balance sheet. As more fully discussed in Note 7, Investments 
will continue to fund the operations of the Company through a promissory 
note. 

5. COMMITMENTS AND CONTINGENCIES 

 EMPLOYMENT AGREEMENTS 

   The Company has entered into three employment agreements that require 
future minimum payments as follows: 

 YEAR ENDING JUNE 30,      AMOUNT 
- --------------------- -------------
1997 ................    $  595,000 
1998 ................       430,000 
1999 ................       250,000 
2000 ................       250,000 
2001 ................       250,000 
Thereafter ..........       250,000 
                       -------------
                         $ 2,025,000 
                       ============= 

   Salary expense recorded under two of the agreements totaled approximately 
$244,000, $302,000 and $355,000 during the years ended June 30, 1994, 1995 
and 1996, respectively. In addition to the minimum salaries described above, 
certain of the employment agreements entitle certain officers to royalties on 
future sales, the aggregate amounts of which may not exceed $5,500,000. The 
third employment agreement, which is for the President and Chief Executive 
Officer, was not entered into 

                                      F-10
<PAGE>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)

5. COMMITMENTS AND CONTINGENCIES--(CONTINUED)

until July 1, 1996. Salary expense recorded under these agreements totaled 
approximately $297,500 (unaudited) for the six months ended December 31, 
1996. 

 LEASE COMMITMENTS 

   The Company has entered into various operating leases for the rental of 
office space and laboratory facilities which expire through fiscal 1999. 
Future minimum commitments under these agreements as of June 30, 1996 are as 
follows: 

 YEAR ENDING JUNE 30,     AMOUNT 
- --------------------- ------------
1997 ................    $322,304 
1998 ................     267,133 
1999 ................      71,557 
                       ------------
                         $660,994 
                       ============ 

   As of June 30, 1995 and 1996, standby letters of credit of $157,050 and 
$65,050, respectively, were issued by a bank on the Company's behalf in favor 
of the lessors as collateral for the leases which the lessors have agreed to 
provide to the Company. 

   Rent expense under operating leases during the years ended June 30, 1994, 
1995 and 1996 and for the six months ended December 31, 1996 was $388,687, 
$450,890, $578,122 and $272,127 (unaudited), respectively. 

 CONSULTING AGREEMENT 

   On April 1, 1996, the Company entered into a consulting agreement with the 
Vice Chairman of the Board of Directors for the formulation and evaluation of 
product development strategies, negotiations for product licenses and other 
responsibilities. The consulting agreement provides for an initial five-year 
term and will automatically renew for each successive two-year period unless 
notification by either party is given. The consultant receives $75,000 as 
annual compensation and is also eligible to receive stock options. 

 LICENSING AND JOINT VENTURE AGREEMENTS 

   The Company has entered into several license agreements (the "License 
Agreements") with third parties (the "Licensees") for the development of 
future products. Under the License Agreements, the Company is required to 
make payments to the Licensees upon completion of various milestones of each 
project in order to secure exclusive rights to develop, manufacture, sell 
and/or sublicense future products developed through the License Agreements. 
In connection with the License Agreements, the Company recorded licensing 
fees expense of approximately $470,000, $449,000, $700,000 and $75,000 
(unaudited) for the years ended June 30, 1994, 1995, 1996 and for the six 
months ended December 31, 1996, respectively, which are reflected in 
"Research and development" in the accompanying consolidated statements of 
operations. In order to maintain its rights under the License Agreements, 
the Company is required to pay certain future milestone payments and licensing
fees. In the event that no milestone event occurs, the Company generally would
not be required to make any milestone payment. The Company anticipates, based on
the development efforts that have been conducted to

                               F-11           
<PAGE>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)

5. COMMITMENTS AND CONTINGENCIES--(CONTINUED)


date, that it will be required to make future milestone payments and pay
licensing fees under the License Agreements as follows: 


                          MINIMUM          ADDITIONAL
 YEAR ENDING JUNE 30,     PAYMENT           PAYMENTS
- ---------------------  --------------     ------------
1997 ................     $150,000         $  859,000 
1998 ................           --            711,000 
1999 ................           --            125,000 
                       --------------     ------------
                          $150,000         $1,695,000 
                       ==============     ============ 

   Additionally, upon FDA approval of certain products, the Company is 
obligated to pay up to $4,500,000 to a licensee. Milestone payments are recorded
when the milestone event occurs.

   The Company has also entered into a letter of intent to form a joint 
venture agreement (the "Joint Venture") with a company related to the sale of 
a certain product using technology provided by that company. The Company paid 
$1,000,000 for the exclusive right to use the technology. Because of the 
uncertainties surrounding the use of the technology, as well as the lack of 
an existing technologically feasible product with commercial viability, such 
amount has been expensed and is included in "Research and development" in the 
accompanying 1996 consolidated statement of operations. Within 30 days 
following the filing of a NDA to the FDA for a certain product developed by 
the Joint Venture, or in the event management determines such NDA filing to 
be infeasible, any party to the Joint Venture investing in excess of the 
other party shall be entitled to consideration and a transfer to it from the 
Joint Venture of an amount not to exceed $1,250,000. 

 SPONSORED RESEARCH 

   The Company has research agreements with two universities and a research 
center. The Company is primarily responsible for funding the projects, and 
the university or research center is responsible for providing personnel, 
equipment and facilities to conduct the research activities. The aggregate 
commitment at June 30, 1996 for future payments under these agreements is 
approximately $200,000 for fiscal year 1997. Expenses recorded under these 
agreements totaled approximately $249,000, $379,000, $373,000 and $162,000 
(unaudited) during the years ended June 30, 1994, 1995 and 1996, and for the 
six months ended December 31, 1996, respectively, and are reflected in 
"Research and development" in the accompanying consolidated statements of 
operations. 

 DEVELOPMENT AGREEMENTS 

   The Company entered into development agreements with various third parties 
during 1996. As dictated by these development agreements, the Company is 
responsible for funding all required development activities. The aggregate 
commitment at June 30, 1996 for future payments under these agreements is 
approximately $724,000 and $200,000 for fiscal years 1997 and 1998, 
respectively. Expense recorded under these agreements totaled approximately 
$665,000 and $496,000 (unaudited) during the year ended June 30, 1996, and 
for the six months ended December 31, 1996, respectively, and are reflected 
in "Research and development" in the accompanying consolidated statements of 
operations. 

 401(K) PLAN 

   The Company's Internal Revenue Code Section 401(k) Plan, known as the Kos 
Savings Plan, became effective on January 1, 1994. Each employee who has 
completed at least one year of service

                               F-12           
<PAGE>


                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)

5. COMMITMENTS AND CONTINGENCIES--(CONTINUED)

with the Company and has attained age 21 is eligible to make pre-tax elective
deferral contributions each year not exceeding the greater of a specified
statutory amount or 15 percent of the employee's compensation for the year. An
employee is always 100 percent vested in the employee's elective deferral
contributions. The Company makes no contributions under this plan.

6. STOCK OPTION PLAN 

   During 1996, the Board of Directors of the Company adopted the Kos 
Pharmaceuticals, Inc. 1996 Stock Option Plan (the "Plan"). As of June 30, 
1996, a maximum aggregate total of 4,000,000 shares of Common Stock may be 
subject to stock options granted or to be granted under the Plan. All 
directors, officers, employees and certain related parties of the Company 
designated by the Board are eligible to receive options under the Plan. The 
Plan is administered by a Committee appointed by the Board of Directors of 
the Company. 


   Each outside director of the Company will be granted an option to purchase
5,000 shares of common stock and automatically will receive an option to
purchase an additional 3,000 shares effective on each director's anniversary
date. The exercise price of such options will be the fair market value on the
later of (a) the date of an initial public offering or December 31, 1996, or (b)
the date the option is granted. As of June 30, 1996, one director had been
granted an option to purchase 5,000 shares at an established exercise price of
$7.00 per share, which is the estimated fair market value the Board of Directors
had attributed to the common stock, as determined by an appraiser. The Company
considered the provisions of SFAS No. 123 using the Black Scholes method and an
expected volatility rate of 57.6%, a risk-free interest rate of 6.11%, expected
dividends of $0 and an expected term of 4 years to approximate the related
charge to expense.


   The maximum term of any option is ten years from the date of grant. All 
options expire within 30 days of termination of employment. 

   The Company has granted options to purchase an aggregate of 2,158,000 
shares to employees, consultants, management and directors, including options 
granted prior to the issuance of the Plan, as follows: 

 OPTIONS GRANTED    DATE OF GRANT     DATE OF EXPIRATION   EXERCISE PRICE 
- ---------------- ----------------- -------------------  ---------------
     750,000      August 1988(a)     June 2006                  $0.60 
     35,000       January 1989(a)    July 2001                   1.90 
     75,000       February 1990(a)   June 2006                   0.90 
     275,000      December 1992      December 2002               0.75 
     50,000       July 1994          July 2003                   3.33 
     973,000      June 1996          June 2006                   7.00 
- -----------------------------------------------------------------------------

(a) During June 1996, the Company modified the terms of the original options 
    granted to an officer and two outside consultants. Included in the 
    accompanying consolidated statements of operations is $5,436,000 recorded 
    as compensation recognized as a result of this modification to the 
    existing option grants. For purposes of determining the values of the 
    options, the Company believes that the Common Stock had a value of $7.00 
    per share on June 30, 1996, which is the estimated fair market value the 
    Board of Directors had attributed to the Common Stock on June 20, 1996, 
    as determined by an appraiser. Compensation expense for the 750,000 options
    issued to an officer was measured based on the excess of the estimated fair
    market value of the Common Stock over the exercise price of the options. For
    the 110,000 options issued to the two outside consultants, the Company
    considered the provisions of SFAS No. 123 using the Black Scholes method and
    an expected volatility rate of 57.6%, a risk-free interest rate of 6.11%,
    expected dividends of $0 and an expected term of 4 years to approximate the
    charge to expense for such non-employees, which amounted to approximately
    $636,000. 


   Exercise prices of options granted were at their estimated fair market 
value as of the date of grant. No options outstanding under the Plan had been 
exercised as of June 30, 1996. 

                                      F-13
<PAGE>

                   KOS PHARMACEUTICALS, INC. AND SUBSIDIARY 
          (A DEVELOPMENT STAGE CORPORATION AND WHOLLY-OWNED SUBSIDIARY
                             OF KOS HOLDINGS, INC.)
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)

7. SUBSEQUENT EVENTS 

   The Company has filed a Registration Statement with the Securities and 
Exchange Commission relating to an initial public offering of its common 
stock. The Company will utilize the net proceeds of the offering to primarily 
fund research and development programs, the initial recruitment of sales 
force for the anticipated commercial launch of NIASPAN, repayment of the 
short-term bridge loan, and other general corporate purposes. 

   On July 1, 1996, the Company executed a promissory note (the "Note") in 
favor of Investments in the aggregate principal amount of up to $15.0 million,
the proceeds of which will be used to fund the Company's operations until the
consummation of this offering. Under the terms of the Note, interest accrues on
the outstanding principal amount at First Union National Bank of Florida's prime
rate commencing July 1, 1996, escalating to a rate of 1% over such prime rate
during calendar year 1997, 2% over such prime rate during calendar year 1998,
and 3% over such prime rate during calendar year 1999 until maturity. As of
December 31, 1996, the Note accrued interest at a rate of 7.25% per year.
Principal and interest under the Note is due on June 30, 1999, however, the
Company may repay the Note in whole or in part prior to such date. From time to
time, at Investments' option, principal and interest outstanding under the Note
may be converted into Common Stock at a conversion price per share equal to the
initial public offering price per share. As of February 7, 1997, the Company had
borrowed $11,355,000 under this Note. Assuming the issuance only of sufficient
shares to repay the indebtedness outstanding as of December 31, 1996,
supplementary pro forma net loss per share of Common Stock would be $(0.67) for
the six month period ended December 31, 1996.

   On February 7, 1997, the Company entered into an agreement with an
unaffiliated generic drug manufacturer pursuant to which the parties agreed to
resolve the effects, as between themselves, of a potential interference
proceeding by the United States Patent and Trademark Office by granting cross
licenses under their respective patent applications and patents, regardless of
whether such licenses would be required. As consideration for entering into the
agreement, the Company agreed to pay the generic manufacturer certain license
fees and royalties on the net sales of NIASPAN subject to a cap on such royalty
payments in the United States and a separate cap on such payments outside the
United States.

8. RELATED PARTY TRANSACTION 

   During 1995 the Company acquired certain property including used 
computers, laboratory equipment, laboratory supplies and certain other office 
equipment and furnishings from the Institute of Molecular Biology, Inc. 
("IMB"), a company controlled by Investments. In the aggregate, such 
purchases totaled approximately $83,500. Until June 1996, Daniel M. Bell, the 
Company's President and Chief Executive Officer, also served as the Chairman 
of the Board of Directors and Chief Executive Officer of IMB. 

                               F-14           
<PAGE>
   No dealer, salesperson or other person has been authorized to give any 
information or to make any representation not contained in this Prospectus 
and, if give or made, such information or representations must not be relied 
upon as having been authorized by the Company or any of the Underwriters or 
by any other person. This Prospectus does not constitute an offer to sell or 
a solicitation of any offer to buy a security other than the shares of Common 
Stock offered hereby, nor does it constitute an offer to sell or a 
solicitation of an offer to buy any of the securities offered hereby to any 
person in any jurisdiction in which it is unlawful to make such offer or 
solicitation to such person. 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 ...............................       6 
The Company ................................      15 
Use of Proceeds ............................      15 
Dividend Policy ............................      15 
Capitalization .............................      16 
Dilution ...................................      17 
Selected Consolidated Financial Data  ......      18 
Management's Discussion and Analysis of 
  Financial Condition and Results of 
  Operations ...............................      19 
Business ...................................      22 
Management .................................      39 
Certain Transactions .......................      46 
Principal Shareholders .....................      47 
Description of Capital Stock ...............      48 
Shares Eligible for Future Sale ............      50 
Underwriting ...............................      51 
Legal Matters ..............................      52 
Experts ....................................      52 
Index to Financial Statements ..............     F-1 
</TABLE>

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

   Until April 1, 1997 (25 days after the date of this Prospectus), all dealers
effecting transactions in the shares of Common Stock, whether or not
participating in this distribution, may be required to deliver a Prospectus.
This is in addition to the obligations of dealers to deliver a Prospectus when
acting as Underwriters and with respect to their unsold allotments or
subscriptions.

                               4,150,000 Shares 

                          KOS PHARMACEUTICALS, INC. 

                                 Common Stock 
- -----------------------------------------------------------------------------

                                  PROSPECTUS 
- -----------------------------------------------------------------------------
                               COWEN & COMPANY 
                           DILLON, READ & CO. INC. 
                             SALOMON BROTHERS INC 

                                 March 7, 1997


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