ENDOREX CORP
10-Q, 1998-11-13
PHARMACEUTICAL PREPARATIONS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                  FORM 10-QSB


(X)  QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934.

For the Quarterly Period Ended September 30, 1998


( )  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934.

For the transition period from ____________  to  ____________


Commission File No.      1-14778


                                 ENDOREX CORP.
            (Exact name of registrant as specified in its charter)


       DELAWARE                                            41-1505029
(State or other jurisdiction of               (I.R.S. Employer Identification
incorporation or organization)                Number)


28101 BALLARD DRIVE, SUITE F, LAKE FOREST, IL                 60045
  (Address of principal executive offices)                  (Zip Code)


Issuer's telephone number, including area code     (847) 573-8990


                 900 NORTH SHORE DRIVE, LAKE BLUFF, IL  60044
(Former name, former address and former fiscal year, if changed since last
report)

Check whether the issuer: (1) filed all reports required to be filed by Section
13 or 15 (d) of the Securities Exchange Act during the past 12 months (or for
such shorter period that the registrant was required to file such reports),
and (2) has been subject to such filing requirements for the past 90 days.

                             Yes  [X]    No   [ ]


At November 13, 1998 9,936,000 shares of the registrant's common stock
(par value, $.001 per share) were outstanding.

Transitional Small Business Disclosure Format (check one):

                             Yes  [ ]    No   [X]
<PAGE>
 
                        PART I. - FINANCIAL INFORMATION

ITEM 1 - Financial Statements

                                 ENDOREX CORP.
                       (A DEVELOPMENT STAGE ENTERPRISE)
                          CONSOLIDATED BALANCE SHEET
                                  (UNAUDITED)

<TABLE> 
<CAPTION> 
                                                             Sept 30,       
                                                               1998         
ASSETS                                                                      
<S>                                                        <C>              
Current assets:                                                             
 Cash and cash equivalents                                 $14,103,207      
 Prepaid expenses                                              104,147      
 Deferred costs                                              1,580,000      
                                                           ------------     
   Total current assets                                     15,787,354     
Leasehold improvements and equipment,                                       
 net of accumulated amortization of                                         
 $916,110                                                      429,294      
Deferred costs                                                  71,509      
Patent issuance costs, net of accumulated                                   
 amortization of $44,701                                       368,585      
                                                           ------------     
TOTAL ASSETS                                               $16,656,742     
                                                           ============     
                                                                            
LIABILITIES AND STOCKHOLDERS' EQUITY                                        
Current liabilities:                                                        
 Accounts payable and accrued expenses                     $   687,984       
                                                                            
Stockholders' equity:                                                       
Preferred stock, $.05 par value,                                            
 300,000 shares authorized, none                                            
 issued and outstanding                                                     
Series B convertible preferred stock,                                       
 $.05 par value, 200,000 shares authorized,                                 
 80,100 issued and outstanding at redemption                                
 and liquidation value                                       8,448,905        
Common stock, $.001 par value,
 50,000,000 shares authorized, 10,054,642    
 issued, 9,936,000 outstanding                                  10,055  
Additional paid-in capital                                  33,683,075 
Deficit accumulated during the
 development stage                                         (25,729,527)  
                                                           ------------   
                                                            16,412,508       
Less:                                                                        
 Treasury stock, at cost, 118,642 shares                      (443,750)        
                                                           ------------      
   Total stockholders' equity                               15,968,758      
                                                           ------------     
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                 $16,656,742     
                                                           ============     
</TABLE> 

           See accompanying condensed notes to financial statements.
<PAGE>
 
                                 ENDOREX CORP.
                       (A DEVELOPMENT STAGE ENTERPRISE)
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)

<TABLE> 
<CAPTION> 
                                                           Cumulative from    
                                        Nine Months        February 15, 1985  
                                      Ended Sept. 30,     (date of inception) 
                                    1998          1997     to Sept. 30, 1998  
<S>                                 <C>           <C>     <C>                 
SBIR contract revenue         $         --   $       --    $    100,000        
                                                                               
Expenses:                                                                     
SBIR contract                                                                 
 research and                                                                 
 development                            --           --          86,168       
Proprietary research
 and development                 2,283,829     1,103,003     12,153,153 
General and
 administrative                  2,588,170       738,889      7,011,081 
                              -------------  ------------  -------------
Total operating expenses         4,871,999     1,841,892     19,250,402 
                              -------------  ------------  -------------
  Loss from operations          (4,871,999)   (1,841,892)   (19,150,402) 
 
Equity in loss from
 joint venture                  (8,010,000)                  (8,010,000) 
Other income                            --            --          1,512  
Interest income                    629,962        19,597      1,636,559  
Interest expense                   (13,483)       (4,929)      (207,196) 
                              -------------  ------------  ------------- 
  Net loss                    $(12,265,520)  $(1,827,224)  $(25,729,527) 
                              =============  ============  =============  
Basic and diluted
 net loss per share
 available to common
 stockholders                 $      (1.28)  $     (1.36)  $     (27.91) 
Basic and diluted
 weighted average common
 shares outstanding              9,943,532     1,329,322        937,651
</TABLE>

           See accompanying condensed notes to financial statements.
<PAGE>
 
                                 ENDOREX CORP.
                       (A DEVELOPMENT STAGE ENTERPRISE)
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)

<TABLE> 
<CAPTION> 
                                  Three Months
                                  Ended Sept. 30,
                              1998            1997
<S>                         <C>           <C>      
Expenses:
Proprietary research
 and development            $   854,367   $  369,006
General and
 administrative                 845,098      226,211
                            -----------   ----------
Total operating expenses      1,699,465      595,217
                            -----------   ----------
  Loss from operations       (1,699,465)    (595,217)
 
Interest income                 182,964       11,648
Interest expense                 (3,074)      (4,929)
                            -----------   ----------
  Net loss                  $(1,519,575)  $ (588,498)
                            ===========   ==========
Basic and diluted net
 loss per share
 available to common
 stockholders               $     (0.17)  $    (0.33)
Basic and diluted
 weighted average common
 shares outstanding           9,936,000    1,810,230
 
</TABLE>

See accompanying condensed notes to financial statements.
<PAGE>
 
                                 ENDOREX CORP.
                       (A DEVELOPMENT STAGE ENTERPRISE)
                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                                     Cumulative from
                                       Nine Months                 February 15, 1985
                                     Ended Sept. 30,              (date of inception)
                                    1998          1997              to Sept. 30, 1998
Net cash used in operating                        
 activities                     $(2,930,126)      $(1,733,686)        $(13,654,961)
                                -----------       -----------         ------------
<S>                             <C>               <C>                 <C>    
INVESTING ACTIVITIES:
 Patent issuance cost               (89,396)          (64,945)            (516,446)
 Investment in joint venture     (8,010,000)                            (8,010,000)
 Organizational costs
  incurred                               --                --                 (135)
 Deposit on leasehold
  improvements                           --                --               (5,000)
 Purchase of leasehold
  improvements                     (237,375)               --             (414,671)
 Purchases of office
  and lab equipment                (149,865)          (52,977)            (936,885)
 Proceeds from assets
  sold                                                     --                1,000
                                -----------      ------------         ------------
Net cash used in
 investing activities            (8,486,636)         (117,922)          (9,882,137)
                                -----------      ------------         ------------
FINANCING ACTIVITIES:
 Net proceeds from
  issuance of common
  stock and warrant               1,871,845         1,746,408           30,024,722
 Proceeds from issuance of
  Series B Preferred              8,010,000                              8,010,000
 Proceeds from exercise
  of options                         61,750                --              200,986
 Proceeds from borrowings
  from President                         --                --               41,433
 Repayment of borrowings
  from President                         --                --              (41,433)
 Proceeds from borrowings
  under line of credit                   --           287,490              662,490
 Repayment of borrowings
  under line of credit                   --          (287,490)            (662,490)
Proceeds from note
  payable to bank                        --                --              150,000
 Payments on note
  payable to bank                        --                --             (150,000)
 Proceeds from borrowings
  from stockholders                      --                --               15,867
 Repayment of borrowings
  from stockholders                      --                --              (15,867)
 Advances from parent
  company                                --                --              135,000
 Payments to parent
  company                                --                --             (135,000)
 Repayment of long-
  term note receivable                   --                --               50,315
 Repayment of note
  payable issued in
  exchange for legal
  service                                --                --              (71,968)
 Purchase of treasury
  stock                            (130,000)               --             (573,750)
                                -----------        ----------          -----------
Net cash provided by
 financing activities             9,813,595         1,746,408           37,640,305
                                -----------        ----------          -----------
Net increase (decrease)
 in cash and cash
 equivalents                     (1,603,167)         (105,200)          14,103,207
 
Cash and cash equivalents at
 beginning of periods            15,706,374           905,907                   --
                                -----------        ----------          -----------
Cash and cash equivalents at
 end of periods                 $14,103,207        $  800,707          $14,103,207
                                ===========        ==========          ===========
</TABLE>

See accompanying condensed notes to financial statements.
<PAGE>
 
                                 ENDOREX CORP.
                       (A DEVELOPMENT STAGE ENTERPRISE)
                         NOTES TO FINANCIAL STATEMENTS


The unaudited interim consolidated financial statements included herein
are prepared under the rules and regulations for reporting on Form 10-QSB.
Accordingly, certain information and footnote disclosures normally accompanying
the annual financial statements have been omitted.  The interim financial
statements and notes should be read in conjunction with the consolidated
financial statements and notes thereto included in the Company's latest annual
report on Form 10-KSB. In the opinion of management, the consolidated financial
statements include all adjustments necessary for a fair statement of the results
of operations, financial position and cash flows for the interim periods.  All
adjustments were of a normal recurring nature. The results of operations for
interim periods are not necessarily indicative of the results for the full
fiscal year.

The Company adopted Statement of Financial Accounting Standards ("SFAS") No.
130, "Reporting Comprehensive Income" as of January 1, 1998. Since the Company
has no components of comprehensive income for the periods presented, there is no
effect of the adoption reflected in the financial statements.

JOINT VENTURE WITH ELAN CORPORATION

On December 31, 1997, the Company executed a binding letter of intent with
Elan Corporation, plc ("Elan"), to establish a joint venture for the exclusive
research, development and commercialization of oral and mucosal vaccines. The
closing of the transactions contemplated by the letter of intent occurred as of
January 21, 1998.

At the time of closing, the Company issued to Elan International Services, Ltd.
("EIS") for an aggregate purchase price of $2,000,000:  (i) 307,692 shares of
the Company's common stock ("Common Stock"), par value $.001 per share, at $6.50
per share and (ii) a nine-year warrant to purchase an additional 230,770 shares
of Common Stock at an exercise price of $10.00 per share.  The fair value
allocated to the warrants at the grant date was $846,000, which has been
recorded as a reclassification of additional paid-in capital.  In addition, EIS
purchased $8.01 million of Series B convertible preferred stock ("Series B
Preferred") of the Company, which is convertible into Common Stock at a price of
$7.50 per share. The Series B Preferred is voting and pays an 8% annual
cumulative in-kind dividend.  The joint venture is being conducted through
Innovax Corporation ("Innovax"), which is initially owned 80.1% by the Company
and 19.9% by EIS. Innovax has licensed certain technology from Elan and certain
other technology from Orasomal Technologies, Inc. ("Orasomal"). The Company has
invested $8.01 million in Innovax and Elan has invested $1.99 million.

In consideration for oral vaccine rights to certain of Elan's proprietary
technology, including patents and know how, Innovax paid Elan an initial $10
million license payment.  Elan may receive future milestones and royalties based
on Innovax's performance. Since the technology does not yet represent a
commercial product, Innovax recorded an expense in the first quarter of 1998 for
the initial license fee paid to Elan. The Company recorded its $8.01 million
share of that expense and simultaneously recorded Elan's purchase of $8.01
million of the Series B Preferred.

Orasomal sub-licensed to Innovax oral vaccine rights to its proprietary
<PAGE>
 
Orasome(TM) polymerized liposome technology exclusively licensed from
Massachusetts Institute of Technology ("MIT"). In consideration of the license,
Orasomal may receive milestone payments and royalties.

The Joint Development and Operating Agreement between the Company and Elan
provides for equal control of Innovax, including representation on the Board of
Directors and agreement of both parties for budgets and material transactions.
Therefore, the Company records Innovax's activities using the equity method of
accounting.

Elan and the Company will each fund R&D activities equally in the first year.
Accordingly, the Company includes R&D expenses incurred in conducting such
activities in the consolidated statement of operations. After the first year,
the Company and Elan will fund future joint venture expenditures in proportion
to their respective ownership levels.

NET LOSS PER SHARE

On October 1, 1997, the Company adopted Statement of Financial Accounting
Standards ("SFAS") No. 128, "Earnings per Share." Earnings per share ("EPS")
have been presented on the Consolidated Statement of Operations in accordance
with SFAS No. 128 for the current and prior periods. As operations resulted in a
net loss for all periods presented, diluted earnings per share are the same as
basic earnings per share due to the anti-dilutive effect of potential dilutive
common shares. The net loss per share is computed by dividing the net loss by
the weighted average number of shares outstanding during the period as follows:

<TABLE>
<CAPTION>
                                                  NINE MONTHS ENDED
                                                    SEPT. 30, 1998
                                                  ------------------
                                   INCOME           SHARES            PER-SHARE
                                   (NUMERATOR)      (DENOMINATOR)     AMOUNT
                                   ------------   -----------------   ---------
<S>                                <C>            <C>                 <C>      
Net loss                           $(12,265,520)
Less: Preferred stock dividends        (438,905)
                                   ------------
BASIC AND DILUTED EPS
Income available to
 common stockholders               $(12,704,425)          9,943,532      $(1.28)
                                   ============   =================   =========
 
                                                  NINE MONTHS ENDED
                                                  SEPT. 30, 1997
                                                  -----------------
                                   INCOME         SHARES              PER-SHARE
                                   (NUMERATOR)    (DENOMINATOR)       -AMOUNT
                                   ------------   -----------------   ---------
Net loss                           $ (1,827,224)
Less: Preferred stock dividends              --
                                   ------------
BASIC AND DILUTED EPS
Income available to
 common stockholders               $ (1,827,224)          1,329,322      $(1.36)
                                   ============   =================   =========
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>
                                               THREE MONTHS ENDED
                                                 SEPT. 30, 1998
                                   ----------------------------------------
<S>                                <C>           <C>              <C>
                                   INCOME        SHARES           PER-SHARE
                                   (NUMERATOR)   (DENOMINATOR)    AMOUNT
                                   -----------   --------------   ---------
 
Net loss                           $(1,519,575)
Less: Preferred stock dividends       (159,761)
                                   -----------
BASIC AND DILUTED EPS
Income available to
 common stockholders               $(1,679,336)       9,936,000      $(0.17)
                                   ===========   ==============   =========
 
                                              THREE MONTHS ENDED
                                                 SEPT. 30, 1997
                                   ----------------------------------------
                                   INCOME        SHARES           PER-SHARE
                                   (NUMERATOR)   (DENOMINATOR)    AMOUNT
                                   -----------   --------------   ---------
 
Net loss                           $  (588,498)
Less: Preferred stock dividends             --
                                   -----------
BASIC AND DILUTED EPS
Income available to
 common stockholders               $  (588,498)       1,810,230      $(0.33)
                                   ===========   ==============   =========
</TABLE>

Options to purchase 1,483,172 shares of Common Stock at a weighted average
exercise price of $3.199 and warrants to purchase 2,459,600 shares of Common
Stock at a weighted average exercise price of $3.243, were outstanding but not
included in the computation of diluted EPS because the effect of the securities
was anti-dilutive.  The Series B Preferred in-kind dividends were included in
the computation of basic and diluted EPS.

SUBSEQUENT EVENT

On September 30, 1998, the Company executed a binding letter of intent with Elan
to establish a second joint venture for the exclusive research, development and
commercialization of products using Elan's Medipad/TM/ delivery system for two
drugs in undisclosed fields. The closing of the transactions contemplated by the
letter of intent occurred as of October 21, 1998.

The second joint venture is initially owned 80.1% by the Company and 19.9% by 
EIS. The new Company has obtained an exclusive worldwide license to the Medipad 
/TM/ drug delivery system from Elan within the undisclosed fields. Medipad/TM/
is a lightweight, disposable drug delivery system, which combines the simplicity
of a patch with the extensive delivery capabilities of an infusion pump.

At the time of closing, the Company and EIS purchased $8,410,500 and $2,089,500
of the second joint venture's common stock, respectively.  In addition, Elan
purchased $8,410,500 of Series C exchangeable convertible preferred stock
("Series C Preferred") of the Company. The Series C Preferred pays a 7% annual
in-kind dividend.  The Series C Preferred plus accrued dividends is exchangeable
at Elan's option for an additional 30.1% ownership interest of the 
<PAGE>
 
second joint venture's common stock, or it may be converted into the Company's
Common Stock at a price of $9.00 per share.

At the time of closing, Elan received an initial $10 million license payment
from the joint venture, and may receive future milestones and royalties based on
the joint venture's performance.  Since the technology does not yet represent a
commercial product, the joint venture will record an expense in the fourth
quarter of 1998 for the initial license fee paid to Elan.  The Company will
record its $8.01 million share of that expense and will simultaneously record
EIS's $8.4 million purchase of Series C Preferred.

Until December 31, 1999, EIS and the Company each will contribute equally
towards funding the second joint venture's research and development activities,
and each will fund subsequent years' expenditures in proportion to their
respective ownership levels.  In addition, during 2000 and 2001, the Company may
require Elan to lend up to $4,806,000, pursuant to a convertible note, to fund
the Company's portion of the second joint venture's research and development
expenses.  The note will bear interest at 7% per year, compounded semi-annually,
and will be convertible into Common Stock at $5.70 per share.


ITEM 2 -  MANAGEMENT'S DISCUSSION AND ANALYSIS OR PLAN OF OPERATION

The following discussion provides information which management believes is
relevant to an assessment and understanding of the Company's results of
operations and financial condition. The discussion should be read in conjunction
with the Company's unaudited consolidated interim financial statements and notes
thereto and the Company's Annual Report on Form 10-KSB. This report contains
certain statements of a forward-looking nature relating to future events or the
future financial performance of the Company. Investors are cautioned that such
statements are only predictions and that actual events or results may differ
materially. In evaluating such statements, investors should carefully consider
the various factors identified in this report, which could cause actual results
to differ materially from those indicated from such forward-looking statements,
including those set forth in Exhibit 99 "Certain Factors that May Affect Future
Results, Financial Condition and the Market Price of Securities" of this
Quarterly Report on Form 10-QSB.

Material Changes in Results of Operations

Net loss for the nine months ended Sept. 30, 1998 increased approximately $10.3
million as compared to the nine months ended Sept. 30, 1997, primarily due to
equity loss from Innovax, which included the Company's 80.1% share of the $10
million license fee paid by Innovax to Elan. Net loss for the three months ended
Sept. 30, 1998 increased $783,532, or 106%, as compared to the three months
ended Sept. 30, 1997. The Company is a development stage enterprise and expects
no significant revenue from the sale of products in the near future.

Research and development expenditures for the nine and three months ended
Sept. 30, 1998 increased $1,180,826, or 107%, and $485,361, or 132%,
respectively, as compared to the corresponding periods ended Sept. 30, 1997.
During the three months ended Sept. 30, 1998, the Company completed its new R&D
center in Lake Forest, Illinois, dedicated to developing the Company's oral
delivery technology for drugs and vaccines.  The transfer of the research and
development activities and personnel from Fargo, North Dakota resulted in non-
recurring charges of approximately $120,000 during the first nine months.
Additionally, during the first three quarters, the Company recruited new
scientific personnel, adding 3 scientists to its staff to support Innovax's and
<PAGE>
 
the Company's other increased research activities. The resulting R&D salary
expenses for the nine and three months ended Sept. 30, 1998 increased
approximately $387,000, or 99%, and $150,000, or 106%, respectively, as compared
to the corresponding periods ended Sept. 30, 1997. Due to the start of a new
randomized Phase II clinical trial for the treatment of pediatric bone cancer
with the Company's proprietary cancer drug, ImmTher(R), the evaluation in
animals of the Orasome(TM) technology with selected hormones at Johns Hopkins
Endocrinology Department and the initial startup of Innovax activities,
consulting expenses, clinical supplies, and sponsored R&D expenses increased
approximately $469,000, or 108% and $249,000, or 189%, respectively, for the
nine and three months ended Sept. 30, 1998 as compared to the same periods ended
Sept. 30, 1997. Additionally, the Company signed a research agreement with the
University of Wisconsin-Madison to develop and evaluate other monoterpene
analogs as cancer drug candidates. In August, the Company was issued a Japanese
patent on ImmTher(R). The Company expects to incur increased research and
development expenses associated with the second joint venture.

General and administrative expenses for the nine and three months ended Sept.
30, 1998 increased $1,849,281, or 250%, and $618,887, or 274%, respectively, as
compared to the nine and three months ended Sept. 30, 1997, mainly due to
amortization of $1,180,000 and $398,000 respectively, in fair value of warrants
issued in connection with the financial advisory agreement with Paramount
Capital, Inc., and additional business development personnel and expenses
related to expanded public and investor relations activities. Legal, accounting
and public relations expenses also increased related to the initiation of the
Company's listing on the American Stock Exchange. The Company began trading on
the American Stock Exchange under its new symbol, DOR, on August 6, 1998.

Interest income for the nine and three months ended Sept. 30, 1998 increased
approximately $610,000 and $171,000, respectively, as compared to the nine and
three months ended Sept. 30, 1997 as a result of investing cash proceeds from
the Company's private placement in October 1997 and the sale of common stock to
Elan in January 1998.

Plan of Operation

During the next twelve months, the Company will continue to conduct Phase II
clinical trials for Perillyl alcohol ("POH") and ImmTher(R).  During the three
months ended Sept. 30, 1998, the Company expanded the clinical trial for
ImmTher(R) in Ewings sarcoma to Memorial Sloan-Kettering, a major cancer center.
The Company is also evaluating initiation of additional clinical trials with POH
and/or ImmTher(R) in other types of cancer, and continues to conduct a sponsored
research agreement with the University of Wisconsin-Madison to develop and
evaluate other monoterpene analogs as cancer drug candidates.

The Company continues pre-clinical development of its Orasome(TM) technology for
the oral delivery of vaccines and drugs.  This development includes ongoing work
with Elan for vaccines and Johns Hopkins Endrocrinology Department for
hormones.  The first patent for this technology issued in June 1998. A new R&D
center was completed in July for this development.  The amortization and
maintenance of leasehold improvements and related new equipment are not expected
to have a material effect on results of operations or financial condition.
During the three months ended Sept. 30, 1998, the Company received notice of
issuance of a patent for its proprietary cancer drug ImmTher(R) for Japan.  In
addition, the FDA designated ImmTher(R) as an Orphan drug for two types of
cancer, Ewings sarcoma and osteosarcoma.  This will allow marketing exclusivity
when the drug is approved for market, as well as tax credits. Additionally, the
Company recruited new scientific personnel for Innovax, 
<PAGE>
 
bringing total employees as of November 13, 1998 to sixteen, of which eight hold
a Ph.D. and one holds an M.D. The Company does not plan to significantly
increase employees in the next twelve months.

On Sept. 30, 1998 and December 31, 1997, the Company had cash and cash
equivalents of $14,103,207 and $15,706,374, respectively, and working capital of
$13,519,370 and $15,212,680, respectively, exclusive of deferred costs.  The
Company's current level of activities requires the expenditure of approximately
$400,000 per month, exclusive of costs associated with the second joint venture
that have not yet been determined.  Management of the Company believes that its
current cash resources will be sufficient to support its currently planned
operations for the next two to three years. However, the Company intends, from
time to time in the future, to seek to expand its research and development
activities into other technologies and/or products that it either may license
from other persons or develop.  Any such activities may require the expenditure
of funds not presently available to the Company.  The Company may seek to obtain
these funds from possible future public or private sales of its securities or
other sources.

In October 1997, the Company completed a $20 million private placement.
Net proceeds were $17.2 million after commissions and expenses.  The Company
used approximately $370,000 to repay a loan from two of its major stockholders.
The remaining proceeds are being used to fund research and development
activities, clinical trials, operations and the acquisition of new technologies.
From October 1997 through Sept. 30, 1998, the Company has used approximately
$3.5 million to fund research and development, including capital improvements
and equipment, clinical trials and operations.

In connection with the formation of Innovax in January 1998, the Company issued
to EIS 307,692 shares of Common Stock and a warrant to purchase 230,770 shares
of Common Stock for an aggregate purchase price of $2 million.  In addition, the
Company issued to EIS 80,100 shares of Series B Preferred for a purchase price
of $8.01 million.  The Company and Elan have invested $8.01 million and $1.99
million, respectively, in Innovax. Pursuant to a license agreement with Elan,
Innovax paid Elan an initial payment of $10 million.

In connection with the formation of the second joint venture with Elan in
October 1998, the Company issued to EIS 84,105 shares of Series C Preferred for
a purchase price of $8.4 million. The Company and Elan have invested $8.4
million and $2.1 million, respectively, in the second joint venture. Pursuant to
a license agreement with Elan, the second joint venture paid Elan an initial
payment of $10 million.

Year 2000

The Company is aware of the issues associated with computer programming code and
certain embedded computer chips used in computer systems as the Year 2000
approaches.  Some systems may not be able to distinguish between the year 2000
and the year 1900.  The Company utilizes personal computers, software packages
developed by third party vendors, and a service bureau for payroll to manage its
business.  It has no internally developed software and does not sell any
products that are derived from internally developed software.

The Company is currently in the process of determining and coordinating the
actions necessary to provide uninterrupted, normal operation of business-
critical systems.  There are four stages to the Year 2000 project:  1)awareness
2)vendor assessment 3)selection of new software, and 4) implementation.  The
Company has completed the first stage of the project plan.  It has inventoried
critical business systems and vendors and estimated the potential impact of
<PAGE>
 
problems should any of the systems be non-compliant. Management believes, that
if necessary, the majority of the Company's systems can be replaced by another
vendor or performed manually with minimal cost.

The Company has cash equivalents which may be exposed to credit risk to the
extent that investment companies are materially adversely affected by the Year
2000 issue.  It is anticipated that any such impact would be short lived and
would not impact the liquidity of the Company or its operating results.

The Company will obtain written confirmation from its vendors regarding Year
2000 compliance.  It is anticipated that the assessment will be completed by
December 31, 1998, allowing adequate time to arrange alternative software and
services, if necessary.  Based on the initial review of its systems to date,
management believes that the Year 2000 problem will not pose significant
operational problems and that the total costs associated with the Year 2000
issues will not have a material effect on the consolidated results of the
Company.

These estimates and conclusions contain forward-looking statements and are based
on management's best estimates of future events.  Risks to completing the Year
2000 plan include the availability of alternative software, the Company's
ability to discover and correct potential Year 2000 problems which might have a
serious impact on operations, and liquidity issues surrounding securities
investments.

Impact of New Accounting Standards

In February 1998 and June 1998, FASB issued SFAS No. 132 "Employers' Disclosure
about Pensions and Other Post-retirement Benefits" and SFAS No. 133 "Accounting
for Derivative Instruments and Hedging Activities," respectively.  The Company
does not expect the effect of the adoption of these pronouncements to have a
material effect on results of operations or financial condition.


                         PART II. - OTHER INFORMATION

ITEM 5 - OTHER INFORMATION

As disclosed in the Company's latest proxy statement, the deadline for
Submitting proposals to be considered for inclusion in the Company's Proxy
Statement for the 1999 Annual Meeting is January 1, 1999.

Pursuant to recent amendments to Rule 14a-4(c)(1) under the Securities Exchange
Act of 1934, the Company will have discretionary voting authority if a proponent
does not notify the Company by March 2, 1999 of their intent to present a
proposal from the floor at the 1999 Annual Meeting of Stockholders or of their
intent to commence a proxy solicitation for the 1999 Annual Meeting of
Stockholders.
<PAGE>
 
ITEM 6 - EXHIBITS AND REPORTS ON FORM 8-K

a)   Exhibits:
          10.21  Securities Purchase Agreement, dated as of October 21, 1998,
                 between the Company and Elan International Services, Ltd.
          10.22  Registration Rights Agreement, dated as of October 21, 1998,
                 between the Company and Elan International Services, Ltd.
          10.23* License Agreement, dated as of October 21, 1998, between the
                 Company, Elan Corporation, plc, Endorex Newco, Ltd. and Elan
                 Medical Technologies Ltd.
          10.24* Joint Development and Operating Agreement, dated as of October
                 21, 1998, between the Company, Elan Corporation, plc, Elan
                 International Services, Ltd. and Endorex Newco, Ltd.
             27  Financial Data Schedule
             99  Certain Factors that May Affect Future Results, Financial
                 Condition, and the Market Price of Securities
     ____________________
     *  The Company has applied for confidential treatment of portions of this
     exhibit pursuant to Rule 24b-2 under the Securities Exchange Act of 1934,
     as amended.

b)   Reports on Form 8-K:

     None.


SIGNATURES


In accordance with the requirements of the Exchange Act, the Registrant caused
this report to be signed on its behalf by the undersigned, thereunto duly
authorized.

                           ENDOREX CORP.
                           
                           /s/ Michael S. Rosen
                           Michael S. Rosen
                           President and Chief Executive Officer
                           (principal executive officer)

                           /s/ David G. Franckowiak
                           David G. Franckowiak
                           Vice President, Finance and Administration
                           (principal financial and accounting officer)


November 13, 1998

<PAGE>
 
                                                                   EXHIBIT 10.21

                         SECURITIES PURCHASE AGREEMENT

          SECURITIES PURCHASE AGREEMENT dated as of October 21, 1998 between
ENDOREX CORP., a Delaware corporation (the "Company"), and ELAN INTERNATIONAL
SERVICES, LTD., a Bermuda corporation ("EIS").

                               R E C I T A L S:

          A.   The Company desires to issue and sell to EIS, and EIS desires to
purchase from the Company, on the date hereof, as provided herein, 84,105 shares
of Series C Convertible Preferred Stock (the "Series C Preferred Stock"), which
shall be issued to EIS pursuant to the Certificate of Designations in the form
attached hereto as Exhibit A (the "Certificate of Designations"), for aggregate
                   ---------                                                   
consideration of $8,410,500.

          B.   The Company may hereafter issue a new series of convertible
indebtedness, to be evidenced by a promissory note with a maximum permitted
borrowing amount of $4,806,000 and otherwise in the form attached hereto as
Exhibit B (the "Convertible Note"; together with the Series C Preferred Stock,
- ---------                                                                     
the "Securities"), which EIS agrees to purchase in accordance with and subject
to the terms and conditions contained herein, as requested by the Company.

          C.   The Company and EIS have caused to be formed Endorex Newco, Ltd.,
a Bermuda corporation ("Newco"), for the purpose of researching, developing and
commercializing certain technologies relating to certain intellectual property
to be licensed to Newco as of the date hereof by an affiliate of EIS.  The
initial stockholders in Newco shall be the Company and EIS.  The parties intend,
as provided herein, that the proceeds of the issuance of the Series C Preferred
Stock shall be applied by the Company solely to fund the Company's initial
investment in Newco.

          D.   The Company and EIS are executing and delivering on the date
hereof a Registration Rights Agreement in the form attached hereto as Exhibit C
                                                                      ---------
(the "Registration Rights Agreement"; together with this Agreement, the
Securities, and each other document or instrument executed and delivered in
connection with the transactions contemplated hereby, including in connection
with the initial formation and capitalization of Newco, the "Transaction
Documents") in respect of the common stock of the Company, par value $.001 per
share (the "Common Stock"), underlying the Series C Preferred Stock and in
respect of the shares of Common Stock into which the Convertible Note may be
converted.

                              A G R E E M E N T:

          The parties agree as follows:

          SECTION 1.  Closings.
                      -------- 

          (a)  Time and Place. The closing of the transactions contemplated
               --------------
hereby (the "Closing") shall occur on the date hereof (the "Closing Date"), at
such place as the parties may agree.
<PAGE>
 
          (b)  Issuance of Securities. At the Closing, the Company shall issue
               ----------------------
and sell to EIS, and EIS shall purchase from the Company the Series C Preferred
Stock for an aggregate purchase price of $8,410,500.

          (c)  Execution of Convertible Note. At the Closing, the Company and
               ----------------------------- 
EIS shall enter into and execute the Convertible Note.

          (d)  Delivery. At the Closing, EIS shall pay the purchase price for
               --------  
the Series C Preferred Stock by wire transfer of immediately available funds to
an account or accounts designated by the Company and the parties hereto shall
execute and deliver to each other, as applicable: (i) a certificate or
certificates for the shares of the Series C Preferred Stock; (ii) the
Convertible Note; (iii) certificates as to the incumbency of the officers
executing this Agreement and each of the other documents or instruments executed
in connection herewith; and (iv) each of the other documents or instruments
executed in connection herewith. In addition, at the Closing, the Company shall
cause to be delivered to EIS an opinion of counsel in form attached hereto as
Exhibit D.
- --------- 

          (e)  Exemption from Registration. The Securities will be issued under
               ---------------------------    
an exemption or exemptions from registration under the Securities Act of 1933,
as amended; accordingly, the certificates evidencing the Securities shall, upon
issuance, contain the following legend:

          THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
          UNDER THE SECURITIES ACT OF 1933 AND MAY NOT UNDER ANY
          CIRCUMSTANCES BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF
          WITHOUT AN EFFECTIVE REGISTRATION STATEMENT FOR SUCH
          SECURITIES UNDER THE SECURITIES ACT OF 1933 AND ANY
          APPLICABLE STATE SECURITIES LAWS OR AN OPINION OF COUNSEL
          SATISFACTORY TO THE CORPORATION THAT REGISTRATION IS NOT
          REQUIRED UNDER SUCH ACT OR ANY APPLICABLE STATE SECURITIES
          LAWS.

          (f)  Registration Rights Agreement. On the date hereof, the Company
               -----------------------------     
and EIS are each executing and delivering the Registration Rights Agreement,
covering the shares of any Common Stock issuable upon conversion, exercise or
exchange of any of the Securities.

          SECTION 2.  Representations and Warranties of the Company.  The
                      ---------------------------------------------      
Company hereby represents and warrants to EIS as follows:

          (a)  Organization and Qualification. The Company is duly organized,
               ------------------------------   
validly existing and in good standing under the laws of the State of Delaware
and has all requisite corporate power and authority to own and lease its
properties, to carry on its business as presently conducted and as proposed to
be conducted and to consummate the transactions contemplated hereby. The Company
is qualified and in good standing to do business in jurisdictions set forth on
Schedule 2(a), which constitute all of the jurisdictions in which the
- ------------- 

                                       2
<PAGE>
 
nature of the business conducted or the property owned by it requires such
qualification, except where the failure to so qualify would not have a Material
Adverse Effect (as defined below) on the business, prospects, properties or
condition (financial or otherwise) of the Company.

          (b)  Capitalization.
               -------------- 

               (i)    The authorized capital stock of the Company as of
September 30, 1998 consisted of 50,000,000 shares of Common Stock, of which
9,936,110 were issued and outstanding, and 500,000 shares of Preferred Stock, of
which (A) 100,000 are designated as Series A Junior Participating Preferred
Stock, none of which were issued or outstanding, and (B) 200,000 are designated
as Series B Convertible Preferred Stock, of which 80,100 shares were issued and
outstanding.

               (ii)   Except as listed in Schedule 2(b) and in the Company's
                                          -------------
filings with the Securities and Exchange Commission on or prior to the date
hereof (the "SEC Filings"), as of the Closing Date there are no options,
warrants or other rights outstanding to purchase, subscribe for or otherwise
acquire, or any securities convertible into, any of the Company's authorized
capital stock. Other than as set forth in this Agreement and as described in
Schedule 2(b), there are no agreements, arrangements or understandings
- -------------
concerning the voting, acquisition or disposition of any of the Company's
outstanding securities to which the Company is a party or of which it is
otherwise aware, and, other than as set forth in Schedule 2(b) or in the
                                                 ------------- 
Registration Rights Agreement, there are no agreements to register any of the
Company's outstanding securities under the U.S. Federal securities laws.

               (iii)  All of the outstanding shares of capital stock of the
Company have been issued in accordance with applicable state and federal laws
and regulations governing the sale and purchase of securities, all of such
shares of have duly and validly issued and are fully paid and non-assessable,
and none of such shares carries preemptive or similar rights.

          (c)  Authorization of Transaction Documents. The Company has full
               --------------------------------------
corporate power and authority to execute and deliver this Agreement and each of
the other Transaction Documents, and to perform its obligations hereunder and
thereunder. The execution, delivery and performance by the Company of the
Transaction Documents have been authorized by all requisite corporate actions by
the Company; and the Transaction Documents have been duly executed and delivered
by the Company, are the valid and binding obligations of the Company, and are
enforceable against the Company in accordance with their respective terms,
except as limited by applicable bankruptcy, insolvency, reorganization,
moratorium and other laws of general application affecting the enforcement of
creditors' rights generally, and except as enforcement of rights to indemnity
and contribution hereunder and thereunder may be limited by U.S. Federal or
state securities laws or principles of public policy.

          (d)  No Conflicts. The execution, delivery and performance by the
               ------------
Company of the Transaction Documents, and compliance with the provisions thereof
by the Company, will not (i) violate any provision of applicable law, statute,
rule or regulation applicable to the Company or any ruling, writ, injunction,
order, judgment or decree of any court, arbitrator, administrative agency or
other governmental body applicable to the Company or any of their respective
properties or assets or (ii) conflict with or result in a breach of any of the
terms, 

                                       3
<PAGE>
 
conditions or provisions of, or constitute (with notice or lapse of time or
both) a default (or give rise to any right of termination, cancellation or
acceleration) under, or result in the creation of, any Encumbrance (as defined
below) upon any of the properties or assets of the Company under its Certificate
of Incorporation, as amended, its Certificate of Designations (in the form to be
filed as provided herein) or By-laws, or any material contract to which the
Company is a party, except where such violation, conflict or breach would not,
individually or in the aggregate, have a material adverse effect on the
business, prospects, properties or condition (financial or otherwise) of the
Company (a "Material Adverse Effect"). As used herein, "Encumbrance" shall mean
any liens, charges, encumbrances, equities, claims, options, proxies, pledges,
security interests, or other similar rights of any nature, except for such
conflicts, breaches or defaults which would not, individually or in the
aggregate, have a Material Adverse Effect.

          (e)  Approvals. Except as set forth on Schedule 2(e), no material
               ---------                         ------------- 
permit, authorization, consent or approval of or by, or any notification of or
filing with, any person or entity (governmental or otherwise) is required in
connection with the execution, delivery or performance of the Transaction
Documents by the Company. There is no approval of the Company's stockholders
required under applicable laws in connection with the execution and delivery the
Transaction Documents or the consummation of the transactions contemplated
thereby, including the filing of the Certificate of Designations and the
issuance of the Securities.

          (f)  Filings, Taxes and Financial Statements.
               --------------------------------------- 

               (i)    The Company has filed its annual report on Form 10-KSB for
the fiscal year ended December 31, 1997 (the "Annual Report"), its related proxy
materials and the quarterly report on Form 10-QSB for the quarter ended June 30,
1998 (the "Quarterly Report,") with the Securities and Exchange Commission and
any other required person or entity (governmental or otherwise) in a timely
manner and as otherwise required by applicable laws and regulations, including
the federal securities acts. The audited financial statements of the Company for
the fiscal year ended December 31, 1997 included in the Annual Report (the
"Audited Financial Statements"), and the Company's unaudited balance sheet for
the period ending June 30, 1998, together with the accompanying statements of
operations and cash flows including the notes thereto (the "June Financial
Statements"; collectively, with the Audited Financial Statements, the "Financial
Statements") are accurate and complete in all material respects and fairly
present the financial condition of the Company as at the dates thereof and have
been prepared in accordance with generally accepted accounting principles
applied on a consistent basis throughout the periods indicated (except as may be
otherwise indicated in such financial statements or the notes thereto), subject,
in the case of the June Financial Statements, to normal year-end audit
adjustments (which shall not be material in the aggregate) and the absence of
footnote disclosures.

               (ii)   The Company has filed in a timely manner all material
federal, state, local and foreign tax returns, reports and filings
(collectively, "Returns"), including income, franchise, property and other
taxes, and has paid or accrued the appropriate amounts reflected on such
Returns. None of the Returns have been audited or challenged, nor has the
Company received any notice of challenge nor have any of the amounts or other
data included in the Returns been challenged or reviewed by any governmental
authority.

                                       4
<PAGE>
 
               (iii)  Except as listed in Schedule 2(f), which sets forth a true
                                          -------------                         
and accurate list and description of any such plans maintained or sponsored by
the Company or to which the Company is required to make contributions, the
Company does not maintain, sponsor, is not required to make contributions to or
otherwise have any liability with respect to any pension, profit sharing, thrift
or other retirement plan, employee stock ownership plan, deferred compensation,
stock ownership, stock purchase, performance share, bonus or other incentive
plan, severance plan, health or group insurance plan, welfare plan, or other
similar plan, agreement, policy or understanding (whether written or oral),
whether or not such plan is intended to be qualified under Section 401(a) of the
Code, within the meaning of Section 3(3) of the Employee Retirement Income
Security Act of 1974, as amended, which plan covers any employee or former
employee of the Company.

          (g)  Absence of Changes. Except as set forth on Schedule 2(g), since
               ------------------                         -------------
June 30, 1998, there has not been (a) any material adverse change in the
business, properties, condition (financial or otherwise), operations or
prospects of the Company; (b) any damage, destruction or loss, whether or not
covered by insurance, materially and adversely affecting the business,
properties, condition (financial or otherwise), operations or prospects of the
Company; (c) any declaration, setting aside or payment of any dividend or other
distribution or payment (whether in cash, stock or property) in respect of the
capital stock of the Company, or any redemption or other acquisition of such
stock by the Company; (d) any disposal or lapse of any trade secret, invention,
patent, trademark, trademark registration, service mark, service mark
registration, copyright, copyright registration, or any application therefor or
filing in respect thereof; (e) loss of the services of any of the key officers
or key employees of the Company; (f) any incurrence of or entry into any
liability, mortgage, lien, commitment or transaction, including without
limitation, any borrowing (or assumption or guarantee thereof) or guarantee of a
third party's obligations, or capital expenditure (or lease in the nature of a
conditional purchase of capital equipment) in excess of $50,000; or (g) any
material change by the Company in accounting methods or principles or (h) any
change in the assets, liabilities, condition (financial or otherwise), results
or operations or prospects of the Company from those reflected on the Quarterly
Report, except changes in the ordinary course of business that have not,
individually or in the aggregate, had a Material Adverse Effect.

          (h)  No Liabilities. Except as set forth in the SEC Filings or
               --------------
Schedule 2(h), the Company has not incurred or suffered any liability or
- -------------
obligation, matured or unmatured, contingent or otherwise, except in the
ordinary course of business, that has had, individually or in the aggregate, a
Material Adverse Effect.

          (i)  Properties and Assets; Etc.
               -------------------------- 

               (i)    The Company does not own any interest in real property,
and (ii) the Company owns or has the right to use pursuant to license, sub-
license, agreement or permission all Intellectual Property necessary for the
operation of its business as presently conducted, including patents, patent
applications, continuations, continuations-in-part, extensions, trademarks and
trademark applications, know-how and other intellectual property, as reflected
in the Financial Statements, subject in each case, to no Encumbrances required
to be disclosed in the Financial Statements except as set forth therein. Except
as set forth on Schedule 2(i), (A) all of the Company's patents, trademarks,
                -------------                                               
service marks, trade names, and copyrights 

                                       5
<PAGE>
 
which are owned by the Company are owned free and clear of all liens, claims and
encumbrances and are valid and duly issued or existing; none of the Company's
rights in or use of such patents, trademarks, service marks, trade names or
copyrights has been or is currently being threatened to be, challenged; to the
Company's knowledge, no current or currently planned product based upon the
Company's intellectual property would infringe any patent, trademark, service
mark, trade name or copyright of any other person or entity issued or pending on
the Closing Date if the Company were to distribute, sell or manufacture such
products; and the Company is not aware, after due inquiry, of any actual or
threatened claim by any person or entity alleging any infringement by the
Company of a patent, trademark, service mark, trade name or copyright possessed
by such Person; (B) all of such patents, trademark registrations, service mark
registrations, trade name registrations and copyrights and copyright
registrations, whether foreign or domestic, have been duly issued and have not
been canceled, abandoned, or otherwise terminated; and (C) all of the Company's
patent applications, trademark applications, service mark applications, trade
name applications and copyright applications have been duly filed.

               (ii)   Each of the contracts listed as an exhibit to the
Company's Annual Report (each, a "Contract") is a legal and valid agreement
binding upon each of the parties thereto and is in full force and effect and, to
the best knowledge of the Company, there is no breach or default by any party
thereunder. Such Contracts constitute all material agreements, arrangements or
understandings required to be included in such Annual Report under Securities
and Exchange Commission regulations promulgated in connection therewith.

               (iii)  The Company has and maintains adequate and sufficient
insurance, including liability, casualty and products liability insurance,
covering risks associated with its business, properties and assets, including
insurance that is customary for companies similarly situated.

               (iv)   The Company, its business and properties and assets are in
compliance, in all material respects, with all applicable laws and regulations,
including without limitation, those relating to (a) health, safety and employee
relations, (ii) environmental matters, including the discharge of any hazardous
or potentially hazardous materials into the environment, and (iii) the
development, commercialization and sale of pharmaceutical and biotechnology
products, including all applicable regulations of the U.S. Food and Drug
Administration and comparable foreign regulatory authorities.

          (j)  Legal Proceedings, etc. There is no legal, administrative,
               ----------------------
arbitration or other action or proceeding or governmental investigation pending
or threatened against the Company, or any director, officer or employee of the
Company, which is required to be described in the Company's SEC Filings and is
not so described. The Company is not in violation of or default under, any
material laws, judgments, injunctions, orders or decrees of any court,
governmental department, commission, agency, instrumentality or arbitrator
applicable to its business.

          (k)  Disclosure. The Company's SEC Filings and the representations and
               ----------
warranties set forth herein and in the other Transaction Documents, when viewed
collectively, do 

                                       6
<PAGE>
 
not contain any untrue statement of a material fact or omit to state any
material fact necessary to make the statements contained herein and therein not
misleading.

          (l)  Brokers or Finders. Other than as set forth on Schedule 2(l), the
               ------------------                              -------------  
Company has not retained any investment banker, broker or finder in connection
with the transactions contemplated by the Transaction Documents; and the Company
agrees to indemnify and hold EIS harmless against any liability, settlement or
expense arising out of, or in connection with, any claims related thereto.

          SECTION 3.  Representation and Warranties of EIS.  EIS hereby
                      ------------------------------------             
represents and warrants to the Company as follows:

          (a)  Organization. EIS is a corporation duly organized, validly
               ------------
existing and in good standing under the laws of Bermuda and has all requisite
corporate power and authority to own and lease its properties, to carry on its
business as presently conducted and as proposed to be conducted and to
consummate the transactions contemplated hereby. EIS is qualified and in good
standing to do business in each jurisdiction in which the nature of the business
conducted or the property owned by it requires such qualification, except where
the failure to so qualify would not reasonably be expected to have a material
adverse effect on the business or condition (financial or otherwise) of EIS.

          (b)  Authorization of Agreement.  EIS has full legal right, power and
               --------------------------                                      
authority to enter into this Agreement and each of the other Transaction
Documents, to purchase and accept the Series C Preferred Stock, to enter into
the Convertible Note, and to perform its obligations hereunder and thereunder,
which have been duly authorized by all requisite corporate action.  This
Agreement and each of the other Transaction Documents are the valid and binding
obligations of EIS, enforceable against them in accordance with their terms.

          (c)  No Conflicts. The execution, delivery and performance by EIS of
               ------------  
this Agreement and each of the other Transaction Documents, the purchase and
acceptance of the Series C Preferred Stock and compliance with provisions hereof
and thereof by EIS, will not (i) violate any provisions of applicable law,
statute, rule or regulation applicable to EIS or any ruling, written,
injunction, order, judgment or decree of any court, arbitration, administrative
agency of other governmental body applicable to EIS of any of its properties or
assets or (ii) conflict with or result in any breach of any of the terms,
conditions or provisions of, or constitute (with notice or lapse of time to
both) a default (or give rise to any right of termination, cancellation or
acceleration) under, or result in the creation of any Encumbrance upon any of
the properties or assets of EIS under the Articles of Association or By-laws of
EIS or any material contract to which EIS is party, except where such violation
conflict or breach would not, individually or in the aggregate, have a Material
Adverse Effect on EIS.

          (d)  Approvals. No permit, authorization, consents or approval of or
               ---------  
by, or any notification of or filing with, any person or entity (governmental or
otherwise) is required in connection with the execution, delivery or performance
of this Agreement or the Note (including the funding and acceptance thereof) by
EIS.

                                       7
<PAGE>
 
          (e)  Investment Representations.
               -------------------------- 

               (i)    EIS is sophisticated in transactions of this type and
capable of evaluating the merits and risks of the transactions described herein
and in the other Transaction Documents, and has the capacity to protect its own
interests. EIS has not been formed solely for the purpose of entering into the
transactions described herein and therein and is acquiring the Securities for
investment for its own account, not as a nominee or agent, and not with the view
to, or for sale in connection with, any distribution of any part thereof;
provided, that EIS shall be permitted to convert or exchange such Securities
and/or transfer them as permitted herein and under applicable law.

               (ii)   Nothing contained in this Section 3(e) shall limit any of
the Company's representations or warranties or limit EIS's recourse in respect
thereof.

               (iii)  Other than as set forth on Schedule 3(e)(iii), EIS has not
                                                 ------------------             
retained any investment banker, broker or finder in connection with the
transactions contemplated by the Transaction Documents; and EIS agrees to
indemnify and hold the Company harmless against any liability, settlement or
expense arising out of, or in connection with, any claims related thereto.

          (f)  Standstill. EIS shall not, for a period of two years from the
               ----------
Closing Date, without the prior written approval of the Company's board of
directors, (i) acquire any of the Company's Common Stock (or securities
exchangeable, convertible or exercisable therefor) other than as contemplated
herein, (ii) enter into any merger, consolidation or similar transaction with
the Company, (iii) otherwise attempt to influence such board of directors or the
Company's stockholders to effect a merger, consolidation, sale of all or
substantially all of the Company's assets or business or (iv) make any public
announcement relating to (i), (ii) or (iii) above; provided, that the foregoing
shall not be applicable in the event that any person or group not affiliated
with EIS (as defined in the regulations under the Securities Exchange Act of
1934) (A) acquires 5% or greater of the Company's Common Stock (or any such
exchangeable, convertible or exercisable securities) or (B) otherwise attempts
to influence the board of directors of Endorex with respect to a merger,
consolidation, asset sale or similar transaction or (C) indicates publicly its
intention to effect any transaction in (A) or (B).

          SECTION 4.  Covenants.
                      --------- 

          (a)  Fully-diluted Stock Ownership. Notwithstanding any other
               -----------------------------   
provision of this Agreement, in the event that EIS shall have determined that at
any time it (together with its Affiliates, if applicable) holds or has the right
to receive Common Stock (or securities or rights, options or warrants
exercisable, exchangeable or convertible for or into Common Stock) representing
in the aggregate in excess of 19.9% of the Company's outstanding Common Stock on
a fully-diluted basis (i.e. assuming the exercise, exchange or conversion of
those securities beneficially owned by EIS or its Affiliates, but not the
exercise, exchange or conversion of any other similar securities), EIS shall
have the right, in its sole discretion, rather than acquiring such securities
from the Company, to exchange such number of securities, as are necessary to
bring its holdings to below 19.9% of the voting securities of the Company, for
non-voting, liquidation preference equity securities of the Company (which shall
be reasonably satisfactory to each of  

                                       8
<PAGE>
 
the Company and EIS), which equity securities shall be entitled to all of the
other rights and benefits of the Common Stock. In the event that EIS shall
undertake to exercise such right, EIS shall retain the additional right to
exchange such new class of equity security for Common Stock, in its discretion.

          (b)  Use of Proceeds. The Company shall use the proceeds of (i) the
               ---------------  
sale of the Series C Preferred Stock solely to meet its capitalization and
funding requirements to Newco, and (ii) the disbursements under the Convertible
Note (if any) solely to meet its development funding obligations to Newco.

          (c)  Further Assurances.  From and after the date hereof, each of the
               ------------------                                              
parties hereto agrees to do or cause to be done such further acts and things and
deliver or cause to be delivered to each other such additional assignments,
agreements, powers and instruments, as each may reasonably require or deem
advisable to carry into effect the purposes of the Transaction Documents or to
better to assure and confirm unto each other their respective rights, powers and
remedies hereunder and thereunder.

          SECTION 5.  Entire Agreement.  This Agreement and the other
                      ----------------                               
Transaction Documents contain the entire understanding of the parties with
respect to the subject matter hereof and supersede all prior agreements and
understandings among the parties with respect thereto; provided, that Section 6
of the letter agreement dated September 30, 1998 (the "Letter Agreement")
between Elan Corporation, plc, an Irish public limited company and EIS, on the
one hand, and the Company, on the other hand, shall survive the execution and
delivery hereof and be subject to the provisions of Section 6 hereof.

          SECTION 6.  Survival and Indemnification.
                      ---------------------------- 

          (a)  Survival Period. The representations and warranties of the
               ---------------    
Company contained herein shall survive for a period of three years after the
date hereof.

          (b)  Indemnification. In addition to all rights and remedies available
               ---------------  
to the parties hereunder at law or in equity, the Company shall indemnify EIS,
and its respective affiliates, and their respective stockholders, officers,
directors, employees, agents, representatives, successors and assigns
(collectively, the "Indemnified Person"), and save and hold each Indemnified
Person harmless from and against and pay on behalf of or reimburse each such
Indemnified Person, as and when incurred, for any and all loss, liability,
demand, claim, action, cause of action, cost, damage, deficiency, tax, penalty,
fine or expense, whether or not arising out of any claims by or on behalf of
such Indemnified Person or any third party, including interest, penalties,
reasonable attorneys' fees and expenses and all amounts paid in investigation,
defense or settlement of any of the foregoing (collectively, "Losses"), that any
such Indemnified Person may suffer, sustain incur or become subject to, as a
result of, in connection with, relating or incidental to or by virtue of:

               (i)  any misrepresentation or breach of warranty on the part of
     the Indemnifying Party under Section 2 of this Agreement or Section 4 of
     the Letter Agreement; or

                                       9
<PAGE>
 
               (ii)   any nonfulfillment, default or breach of any covenant or
     agreement on the part of the Indemnifying Party under Section 4 of this
     Agreement.

          (c)  Maximum Recovery. The maximum recovery of EIS under this Section
               ----------------
6 shall not exceed the sum of (x) $8,410,500 and (y) the amount outstanding (if
any) under the Convertible Note at the time of any claim for indemnity
hereunder.  No Indemnified Person shall assert any such claim unless Losses in
respect thereof incurred by any Indemnified Person, when aggregated with all
previous Losses hereunder, equal or exceed $50,000, and the obligation of the
Company to indemnify shall not apply to the first $50,000 of losses to the
Indemnified Person.

          (d)  Exception. Notwithstanding the foregoing, and subject to the
               ---------
following sentence, upon judicial determination that is final and no longer
appealable, that the act or omission giving rise to the indemnification set
forth above resulted primarily out of or was based primarily upon the
Indemnified Person's negligence (unless such Indemnified Person's negligence was
based upon the Indemnified Person's reliance in good faith upon any of the
representations, warranties, covenants or promises made by the Company herein),
the Company shall not be responsible for any Losses sought to be indemnified in
connection therewith, and the Company shall be entitled to recover from the
Indemnified Persons all amounts previously paid in full or partial satisfaction
of such indemnity, together with all costs and expenses (including reasonable
attorneys fees) of the Company reasonably incurred in connection with the
Indemnified Person's claim for indemnity, together with interest at the rate per
annum publicly announced by Morgan Guaranty Trust Company as its prime rate from
the time of payment of such amounts to the Indemnified Person until repayment to
the Company.

          (e)  Investigation. All indemnification rights hereunder shall survive
               -------------
the execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby to the extent provided in Section 6(b) above,
irrespective of any investigation, inquiry or examination made for or on behalf
of, or any knowledge of the Indemnified Persons or the acceptance of any
certificate or opinion.

          (f)  Contribution. If the indemnity provided for the this Section 6
               ------------     
shall be, in whole or in part, unavailable to any Indemnified Person, due to
Section 6(b) being declared unenforceable by a court of competent jurisdiction
based upon reasons of public policy, so that Section 6(b) shall be insufficient
to hold each such Indemnified Person harmless from Losses which would otherwise
be indemnified hereunder, then the Company and the Indemnified Person shall each
contribute to the amount paid or payable for such Loss in such proportion as is
appropriate to reflect not only the relative benefits received by the Company on
the one hand and the Indemnified Person on the other, but also the relative
fault of the Company and be in addition to any liability that the Company may
otherwise have. Subject to Section 6(h) hereunder, the indemnity, contribution
and expense reimbursement obligations that the Company has under this Section 6
shall survive the expiration of the Transaction Documents. The parties hereto
further agree that the indemnification and reimbursement commitments set forth
in this Agreement shall apply whether or not the Indemnified Person is a formal
part to any such lawsuit, claims or other proceedings.

                                       10
<PAGE>
 
          (g)  Limitation. No claim shall be brought by an Indemnified Person in
               ----------    
respect of any misrepresentation or breach of warranty under this Agreement
after three years from and after the date hereof unless written notice thereof
shall have been provided prior to such three  year period, in which case
surviving claims shall be limited to those in such notice; and any claim for
nonfulfillment, default or breach of any covenant shall be brought within one
year of the date of that such Indemnified Person became aware or should have
become aware of the nonfulfillment, default or breach, unless written notice
thereof shall have been provided prior to such one-year period, in which case
such surviving claims shall be limited to those in such notice.  Except as set
forth in the previous sentence and in Section 6(c) above, this Section 6 is not
intended to limit the rights or remedies otherwise available to any party hereto
with respect to this Agreement or the Transaction Documents.

          SECTION 7.  Notices.  All notices, demands and requests of any kind to
                      -------                                                   
be delivered to any party in connection with this Agreement shall be in writing
and shall be deemed to have been duly given if personally delivered or if sent
by nationally-recognized overnight courier or by registered or certified
airmail, return receipt requested and postage prepaid, addressed as follows:

               (i)    if to the Company, to:
                      
                      Endorex Corp.
                      900 Lake Shore Drive                   
                      Lake Bluff, Illinois 60044             
                      Attn: President                        
                                                             
                      with a copy to:                        
                      
                      Brobeck, Phleger & Harrison LLP        
                      1633 Broadway, 47/th/ Floor            
                      New York, New York 10019               
                      Attention: Nigel L. Howard, Esq.       
                                                             
               (ii)   if to EIS, to:                         
                                                             
                      Elan International Services, Ltd.      
                      102 St. James Court                    
                      Flatts, Smiths Parish                  
                      Bermuda FL04                           
                      Attention: Director                    
                                                             
                      with a copy to:                        
                                                             
                      Brock Silverstein McAuliffe LLC        
                      153 East 53rd Street, 56/th/ Floor     
                      New York, New York 10022               
                      Attention: David Robbins, Esq.          

                                       11
<PAGE>
 
or to such other address as the party to whom notice is to be given may have
furnished to the other party hereto in writing in accordance with provisions of
this Section 7.  Any such notice or communication shall be deemed to have been
received (i) in the case of personal delivery, on the date of such delivery,
(ii) in the case nationally-recognized overnight courier, on the second business
day after the date when sent and (iii) in the case of mailing, on the fifth
business day following that day on which the piece of mail containing such
communication is posted.  Notice hereunder may be given on behalf of the parties
by their respective attorneys.

          SECTION 8.   Amendments.  This Agreement may not be modified or
                       ----------                                        
amended, or any of the provisions hereof waived, except by written agreement of
the Company and EIS.

          SECTION 9.   Counterparts and Facsimile. The Transaction Documents may
                       --------------------------                            
be executed in any number of counterparts, and each such counterpart hereof
shall be deemed to be an original instrument, but all such counterparts together
shall constitute one agreement.  Each of the Transaction Documents may be signed
and delivered to the other party by facsimile transmission; such transmission
shall be deemed a valid signature.

          SECTION 10.  Headings.  The section and paragraph headings contained 
                       --------                                               
in this Agreement are for reference purposes only and shall not affect in any
way the meaning or interpretation of the Agreement.

          SECTION 11.  Governing Law.  This Agreement shall be governed by and
                       -------------                                          
construed in accordance with the laws of the State of New York, without giving
effect to the principles thereof relating to conflicts of laws.

          SECTION 12.  Expenses.  Each of the parties shall be responsible for
                       --------                                               
its own costs and expenses incurred in connection with the transactions
contemplated hereby and by the other Transaction Documents.

          SECTION 13.  Public Releases; Etc. Neither the Company nor EIS shall,
                       --------------------                                    
except as required by applicable law or judicial or administrative process or
pursuant to arrangements with financial, accounting or legal advisors, disclose
to any person or entity, publicly or privately, this Agreement or the substance
of the transactions contemplated hereby, without the prior written consent of
the other party.  Prior to issuing any press release or public disclosure in
respect of this Agreement or the transactions contemplated hereby, the party
proposing such issuance shall obtain the consent of the other party to the
contents thereof, which consent shall not be unreasonably withheld or delayed;
it being understood that if such second party shall not have responded to such
consent request within one business day, such consent shall be deemed given.

          SECTION 14.  Schedules, etc.  All statements contained in any exhibit
                       --------------                                          
or schedule delivered by or on behalf of the parties hereto, or in connection
with the transactions contemplated hereby, are an integral part of this
Agreement and shall be deemed representations and warranties hereunder.

          SECTION 15.  Assignments.  This Agreement and all of the provisions
                       -----------                                           
hereof shall be binding upon and inure to the benefit of the parties hereto and
their respective successors and permitted assigns.  This Agreement, the other
Transaction Documents, and the Securities 

                                       12
<PAGE>
 
may be transferred by EIS to affiliates and subsidiaries without restriction or
other entities in which any affiliates of EIS may have a contractual or equity
interest (so long as EIS acts as agent or nominee for determinations hereunder);
provided, however, that EIS shall remain liable for its obligations hereunder
after any such assignment. Other than as set forth above, no party shall
transfer or assign this Agreement or the other Transaction Documents or any
interest therein without the prior written consent of the other party.

                            [Signature page follows]

                                       13
<PAGE>
 
          IN WITNESS WHEREOF, each of the undersigned has duly executed this
Securities Purchase Agreement as of the date first written above.

                             Endorex Corp.                                   
                                                                             
                             By:/s/ David G. Franckowiak                     
                                ------------------------------------------------
                                   Name:  David G. Franckowiak               
                                   Title: Vice President, Finance and        
                                          Administration                     
                                                                             
                             Elan International Services, Ltd.               
                                                                             
                             By:/s/ Kevin Insley                             
                                ------------------------------------------------
                                   Name:  Kevin Insley                       
                                   Title: President and Chief Financial Officer

                                       14
<PAGE>
 
                                 Schedule 2(a)
                                 -------------
                     to the Securities Purchase Agreement

                        Organization and Qualification
                        ------------------------------

                                   Delaware
                                   Illinois






                                       i

<PAGE>
 
                                 Schedule 2(b)
                                 -------------
                     to the Securities Purchase Agreement

                                Capitalization
                                --------------

(a)  Warrants. As described in the Company's SEC filings, there are outstanding
     warrants (i) to purchase up to 66,668 shares of the Company's Common Stock
     at $2.3125 per share exercisable until April 16, 2002, (ii) to purchase
     2,162,162 shares of the Company's Common Stock at $2.54375 per share
     exercisable from April 16, 1998 until April 16, 2003 and (iii) to purchase
     230,770 shares of the Company's Common Stock at $10.00 per share
     exercisable until January 20, 2004.

(b)  Options. Pursuant to the Company's Amended and Restated 1995 Omnibus
     Incentive Plan, which authorizes the grant of options to purchase up to
     2,000,000 shares of the Company's Common Stock, there are outstanding
     options to purchase 1,483,172 shares of Common Stock.

(c)  Registration Rights. Pursuant to agreements dated as of March 1, 1996 and
     June 26, 1996, the holders of approximately 666,667 shares of the Company's
     Common Stock are entitled to certain demand, piggyback and S-3 registration
     rights. Pursuant to various Subscription Agreements dated as of July 16,
     1997, October 10, 1997 and October 17, 1997 and a Placement Agency
     Agreement dated July 1, 1997, the Company filed a registration statement on
     Form S-2 (the "Registration Statement") to register 10,655,202 shares of
     the Company's Common Stock. The Registration Statement was declared
     effective on August 5, 1998. Pursuant to a Registration Rights Agreement,
     dated as of January 21, 1998, between the Company and EIS, EIS is entitled
     to certain demand and piggyback registration rights with respect to (i)
     certain shares of Common Stock issued pursuant to a Stock Purchase
     Agreement dated as of January 21, 1998, (ii) Common Stock issued or
     issuable upon conversion of certain shares of Series B convertible
     preferred stock and (iii) Common Stock issued or issuable upon exercise of
     a warrant to purchase 230,770 shares of Common Stock.







                                      ii
<PAGE>
 
                                 Schedule 2(e)
                                 -------------
                     to the Securities Purchase Agreement

                                   Approvals
                                   ---------

                                     None.








                                      iii
<PAGE>
 
                                 Schedule 2(f)
                                 -------------
                     to the Securities Purchase Agreement

                    Filings, Taxes and Financial Statements
                    ---------------------------------------


Amended and Restated 1995 Omnibus Incentive Plan.







                                      iv
<PAGE>
 
                                 Schedule 2(g)
                                 -------------
                     to the Securities Purchase Agreement

                              Absence of Changes
                              ------------------


<TABLE>
<CAPTION>
<S>                                          <C>
     Capital Expenditures:
          Leasehold Improvements             $ 113,222
          Lab Equipment                      $  37,960
                                             ---------
          Total Capital Expenditures         $ 151,182
                                             =========

</TABLE> 







                                       v
<PAGE>
 
                                 Schedule 2(h)
                                 -------------
                     to the Securities Purchase Agreement

                                No Liabilities
                                --------------

                                     None.








                                      vi
<PAGE>
 
                                 Schedule 2(i)
                                 -------------
                     to the Securities Purchase Agreement

                             Intellectual Property
                             ---------------------

                                     None.









                                      vii
<PAGE>
 
                                 Schedule 2(j)
                                 -------------
                     to the Securities Purchase Agreement

                              Brokers or Finders
                              ------------------

(a)  The Company and Paramount Capital, Inc. ("Paramount") have entered into a
     financial advisory agreement (the "Financial Advisory Agreement"), dated
     October 16, 1997, whereby Paramount acts as the Company's non-exclusive
     financial advisor for a minimum period of 24 months.

                                     viii
<PAGE>

                                                                       EXHIBIT A
 
            CERTIFICATE OF DESIGNATIONS, PREFERENCES AND RIGHTS OF

                     SERIES C CONVERTIBLE PREFERRED STOCK

                                      OF

                                 ENDOREX CORP.

          The undersigned officers of Endorex Corp., a corporation organized and
existing under the General Corporation Law of the State of Delaware (the
"Corporation"), do hereby certify that, pursuant to authority conferred by the
Certificate of Incorporation of the Corporation, as amended (the "Certificate of
Incorporation"), and pursuant to the provisions of Section 151 of the General
Corporation Law of the State of Delaware, the Board of Directors of the
Corporation adopted a resolution adopting a Certificate of Designations,
Preferences and Rights of Series C Convertible Preferred Stock (this
"Certificate of Designations") providing for certain designations, powers,
number, preferences and relative, participating, optional or other special
rights, and the qualifications, limitations or restrictions thereof, of 200,000
shares of Series C Convertible Preferred Stock, par value $.05 per share, which
resolution is as follows:

          RESOLVED: That pursuant to Article Fourth of the Certificate
     of Incorporation, as amended, of this Corporation, the Board of
     Directors hereby establishes the following series of Preferred
     Stock, par value $.05 per share (the "Preferred Stock"), of the
     Corporation having the designations, powers, number, preferences
     and relative, participating, optional or other special rights,
     and the qualifications, limitations or restrictions thereof set
     forth below:

          1.   Designation.  200,000 shares of the Preferred Stock shall be
               -----------                                                 
designated and known as the "Series C Convertible Preferred Stock."  Such number
of shares may be increased or decreased by resolution of the Board of Directors
after obtaining the consent of a majority in interest of the then outstanding
shares of Series C Convertible Preferred Stock; provided, however, that no
decrease shall reduce the number of shares of Series C Convertible Preferred
Stock to a number less than the number of shares then outstanding plus the
number of shares issuable upon exercise of outstanding rights, options or
warrants or upon conversion of outstanding securities issued by the Corporation.

          2.   Dividend Provisions.
               ------------------- 

               (a)  Subject to the prior and superior rights of any series of
Preferred Stock which may from time to time come into existence, the holders of
shares of Series C Convertible Preferred Stock shall be entitled to receive
dividends, out of any assets legally available therefor, prior and in preference
to any declaration or payment of any dividend (payable other than in Common
Stock or other securities and rights convertible solely into or entitling the
holder thereof to receive, directly or indirectly, additional shares of Common
Stock of the Corporation) on the Common Stock of the Corporation, at the rate of
seven percent (7%) per annum. Such dividends shall be cumulative and accrue
annually on the last day of December (except that if any such date is a
Saturday, Sunday or legal holiday, then such dividend shall be payable on the
next day that is not a Saturday, Sunday or legal holiday), in each year,  
<PAGE>
 
commencing on December 31, 1998, for each full year and each portion of a year
that the share entitled to such dividend is outstanding.

               (b)  Such dividends shall be payable in shares (but not
fractional shares) of Series C Convertible Preferred Stock.

               (c)  In addition, when and if the Board of Directors shall
declare a dividend or distribution payable with respect to the then outstanding
shares of Common Stock of the Corporation (other than a dividend payable solely
in shares of Common Stock), the holders of the Series C Convertible Preferred
Stock shall be entitled to the amount of dividends per share as would be payable
on the largest number of whole shares of Common Stock into which each share of
Series C Convertible Preferred Stock could then be converted pursuant to Section
5 hereof (such number to be determined as of the record date for the
determination of holders of Common Stock entitled to receive such dividend).

          3.   Liquidation Preference.
               ---------------------- 

               (a)  In the event of any liquidation, dissolution or winding-up
of the affairs of the Corporation, whether voluntary or involuntary
(collectively, a "Liquidation"), before any payment of cash or distribution of
other property shall be made to the holders of the Common Stock (the "Common
Stockholders") or any other class or series of stock subordinate in Liquidation
Preference to the Series C Convertible Preferred Stock, the Series C Convertible
Preferred Stockholders shall be entitled to receive out of the assets of the
Corporation legally available for distribution to its stockholders, an amount
equal to the sum of (i) the Original Purchase Price per share (as appropriately
adjusted for any combinations or divisions or similar recapitalizations
affecting the Series C Convertible Preferred Stock after issuance) (the "Series
C Liquidation Preference"), out of funds legally available therefor, and (ii) an
amount equal to any declared but unpaid dividends thereon. As used herein, the
"Original Purchase Price" is $100 per share.

               (b)  If, upon any Liquidation, the assets of the Corporation
available for distribution to its stockholders shall be insufficient to pay the
Series C Convertible Preferred Stockholders the full amounts to which they shall
be entitled, the Series C Convertible Preferred Stockholders shall share ratably
in any distribution of assets in proportion to the respective amounts which
would be payable to them in respect of the shares held by them if all amounts
payable to them in respect of such were paid in full pursuant to Section 3(a).

               (c)  After the distributions described in subsection (a) above
have been paid, subject to the rights of other series of Preferred Stock which
may from time to time come into existence, the remaining assets of the
Corporation available for distribution to stockholders shall be distributed
among the holders of Common Stock pro rata based on the number of shares of
Common Stock held by each.

               (d)  For purposes of this Section 3, a liquidation, dissolution
or winding up of the Corporation shall be deemed to be occasioned by, or to
include, (A) the acquisition of the Corporation by another entity by means of
any transaction or series of related transactions (including, without
limitation, any reorganization, merger or consolidation but, excluding any

                                       2
<PAGE>
 
merger effected exclusively for the purpose of changing the domicile of the
Corporation), unless the Corporation's stockholders of record as constituted
immediately prior to such acquisition or sale will, immediately after such
acquisition (by virtue of securities issued as consideration for the
Corporation's acquisition) hold at least 50% of the voting power of the
surviving or acquiring entity; or (B) a sale of all or substantially all of the
assets of the Corporation.

                    (i)    In any of such events, if the consideration received
by the Corporation is other than cash, its value will be deemed its fair market
value, which shall be valued as follows:

                           (A)  Securities not subject to investment letter or
other similar restrictions on free marketability covered by (B) below:

                                (1)  If traded on a securities exchange or
through Nasdaq (as defined below), the average of the closing prices of the
securities on such exchange during the thirty (30) day period ending three (3)
days prior to the closing;

                                (2)  If actively traded over-the-counter, the
average of the closing bid or sale prices (whichever is applicable) over the
thirty (30) day period ending three (3) days prior to the closing; and

                                (3)  If there is no active public market, the
fair market value thereof, as mutually determined by the Corporation and the
holders of at least a majority of the voting power of all then outstanding
shares of Series C Convertible Preferred Stock.

                           (B)  The method of valuation of securities subject to
investment letter or other restrictions on free marketability (other than
restrictions arising solely by virtue of a stockholder's status as an affiliate
or former affiliate) shall be to make an appropriate discount from the market
value determined as above in (A) (1), (2) or (3) to reflect the approximate fair
market value thereof, as mutually determined by the Corporation and the holders
of at least a majority of the voting power of all then outstanding shares of
such Preferred Stock.

                    (ii)   In the event the requirements of this subsection 3(d)
are not complied with, the Corporation shall forthwith either: 

                           (A)  cause such closing to be postponed until such
time as the requirements of this Section 3 have been complied with; or

                           (B)  cancel such transaction, in which event the
rights, preferences and privileges of the holders of the Series C Convertible
Preferred Stock shall revert to and be the same as such rights, preferences and
privileges existing immediately prior to the date of the first notice referred
to in subsection 3(d)(iii) hereof.

                    (iii)  The Corporation shall give each holder of record of
Series C Convertible Preferred Stock written notice of such impending
transaction not later than twenty (20) days prior to the stockholders' meeting
called to approve such transaction, or twenty (20) 

                                       3
<PAGE>
 
days prior to the closing of such transaction, whichever is earlier, and shall
also notify such holders in writing of the final approval of such transaction.
The first of such notices shall describe the material terms and conditions of
the impending transaction and the provisions of this Section 3, and the
Corporation shall thereafter give such holders prompt notice of any material
changes. The transaction shall in no event take place sooner than twenty (20)
days after the Corporation has given the first notice provided for herein or
sooner than ten (10) days after the Corporation has given notice of any material
changes provided for herein; provided, however, that such periods may be
shortened upon the written consent of the holders of Preferred Stock that are
entitled to such notice rights or similar notice rights and that represent at
least a majority of the voting power of all then outstanding shares of such
Preferred Stock.

          4.   Exchange.
               -------- 

               (a)  At any time on or after the date upon which any shares of
Series C Convertible Preferred Stock were first issued (the "Purchase Date"),
each holder of record of Series C Convertible Preferred Stock may, at its
option, on one occasion, exchange (the "Exchange Right") the Series C
Convertible Preferred Stock for shares of common stock, par value $1.00 per
share, of Endorex Newco, Ltd., a Bermuda corporation ("Newco"), formed by the
Corporation and Elan International Systems, Ltd., such that the aggregate
percentage ownership of all holders of record of Series C Convertible Preferred
Stock becomes fifty percent (50%) of the then outstanding shares of Newco common
stock (the "Newco Common Stock"), provided that all holders of record of Series
C Convertible Preferred Stock shall elect to exercise the Exchange Right at the
same time and shall have not exercised any portion of the Conversion Rights (as
defined herein).

               (b)  To exercise the Exchange Right under this Paragraph 4, each
holder of record of Series C Convertible Preferred Stock, not more than ninety
(90) nor less than forty-five (45) days prior to the date on which the Exchange
Right is to be exercised (the "Exchange Date"), shall give notice by first class
mail, postage prepaid, to the Corporation. Each such notice of exchange shall
specify the Exchange Date; the place or places for delivery; that accrued but
unpaid dividends to the Exchange Date are to be paid on the Exchange Date; and
that on and after the Exchange Date, such shares of Series C Convertible
Preferred Stock shall be surrendered and extinguished, and all rights whatsoever
with respect to such shares, including any rights of conversion, shall
terminate. On or after the Exchange Date, as stated in such notice, each holder
of the shares of Series C Convertible Preferred Stock shall surrender the
certificate evidencing such shares to the Corporation at the place designated in
such notice and shall thereupon be entitled to receive such number of shares of
Newco Common Stock so as to increase the aggregate percentage ownership of all
holders of record of Series C Convertible Preferred Stock to 50% of the then
outstanding shares of Newco Common Stock.

               (c)  Neither the Corporation nor Newco shall be liable to pay any
tax which may become due or payable in respect of any transfer involved in the
issue and delivery upon exchange of the Series C Convertible Preferred Stock for
the Newco Common Stock in a name other than that of the record holder of the
shares of the Series C Convertible Preferred Stock being exchanged. In addition,
neither the Corporation nor Newco shall be required to issue or deliver any such
shares unless and until the person or persons requesting the issuance thereof
shall have (i) paid to the Corporation or Newco the amount of any such tax, (ii)

                                       4
<PAGE>
 
established to the satisfaction of the Corporation or Newco that such tax has
been paid or (iii) agreed in writing to indemnify the Corporation and Newco from
and against any liability arising from a failure to pay or withhold such tax, as
well as any interest and penalty related thereto.

          5.   Conversion. The holders of the Series C Convertible Preferred
               ----------  
Stock shall have conversion rights (the "Conversion Rights") as follows:

               (a)  Right to Convert. Each share of Series C Convertible
                    ----------------  
Preferred Stock shall be convertible, at the option of the holder thereof, at
any time two years after the date of issuance of such share, at the office of
the Corporation or any transfer agent for such stock, into such number of fully
paid and nonassessable shares of Common Stock as is determined by dividing the
Series C Liquidation Preference by the conversion price applicable to such share
(the "Conversion Price"), determined as hereafter provided, in effect on the
date the certificate is surrendered for conversion; provided, however, that in
no event shall any holder of Series C Convertible Preferred Stock be entitled to
convert his, her or its shares of Series C Convertible Preferred Stock in excess
of that number of Series C Convertible Preferred Stock which, upon giving effect
to such conversion, would cause the aggregate number of shares of Common Stock
beneficially owned by the holder and its affiliates to exceed nineteen and nine-
tenths percent (19.9%) of the outstanding shares of Common Stock following such
conversion. For purposes of the foregoing provision, the aggregate number of
shares of Common Stock beneficially owned by the holder and its affiliates shall
include the number of shares of Common Stock issuable upon conversion of the
Series C Convertible Preferred Stock with respect to which the determination of
such provision is being made, but shall exclude the number of shares of Common
Stock which would be issuable upon (i) conversion of the remaining, nonconverted
shares of Series C Convertible Preferred Stock beneficially owned by the holder
and its affiliates and (ii) exercise or conversion of the unexercised or
unconverted portion of any other securities of the Company subject to a
limitation on conversion or exercise analogous to the limitation contained
herein beneficially owned by the holder and its affiliates. Except as set forth
in the preceding sentence, for purposes of this Section 5(a), beneficial
ownership shall be calculated in accordance with Section 13(d) of the Securities
Exchange Act of 1934, as amended. The initial Conversion Price per share for
shares of Series C Convertible Preferred Stock shall be $9.00; provided,
however, that the Conversion Price for the Series C Convertible Preferred Stock
shall be subject to adjustment as set forth in subsection 5(d).

               (b)  Automatic Conversion. Each share of Series C Convertible
                    --------------------
Preferred Stock shall automatically be converted into shares of Common Stock at
the Conversion Price at the time in effect for such Series C Convertible
Preferred Stock immediately upon the earlier of (i) October 21, 2002 and (ii)
the Corporation's sale of its Common Stock in a firm commitment underwritten
public offering pursuant to a registration statement under the Securities Act of
1933, as amended, the public offering price of which is not less than $9.00 per
share (adjusted to reflect subsequent stock dividends, combinations, splits or
recapitalization) and with aggregate gross proceeds of not less than $10,000,000
(a "Qualified Public Offering").

               (c)  Mechanics of Conversion. Before any holder of Series C
                    -----------------------  
Convertible Preferred Stock shall be entitled to convert the same into shares of
Common Stock, such holder shall surrender the certificate or certificates
therefor, duly endorsed, at the office of the Corporation or of any transfer
agent for the Series C Convertible Preferred Stock, and shall

                                       5
<PAGE>
 
give written notice to the Corporation at its principal corporate office, of the
election to convert the same and shall state therein the name or names in which
the certificate or certificates for shares of Common Stock are to be issued. The
Corporation shall, as soon as practicable thereafter, issue and deliver at such
office to such holder of Series C Convertible Preferred Stock, or to the nominee
or nominees of such holder, a certificate or certificates for the number of
shares of Common Stock to which such holder shall be entitled as aforesaid. Such
conversion shall be deemed to have been made immediately prior to the close of
business on the date of such surrender of the shares of Series C Convertible
Preferred Stock to be converted, and the person or persons entitled to receive
the shares of Common Stock issuable upon such conversion shall be treated for
all purposes as the record holder or holders of such shares of Common Stock as
of such date. If the conversion is in connection with a Qualified Public
Offering, the conversion may, at the option of any holder tendering Series C
Convertible Preferred Stock for conversion, be conditioned upon the closing with
the underwriters of the sale of securities pursuant to such offering, in which
event the person(s) entitled to receive the Common Stock upon conversion of the
Series C Convertible Preferred Stock shall not be deemed to have converted such
Series C Convertible Preferred Stock until immediately prior to the closing of
such sale of securities.

               (d)  Conversion Price Adjustments of Preferred Stock for Certain
                    -----------------------------------------------------------
Dilutive Issuances, Splits and Combinations. The Conversion Price of the Series
- -------------------------------------------
C Convertible Preferred Stock shall be subject to adjustment from time to time
as follows:

                    (i)  (A)  If the Corporation shall issue, after the Purchase
Date, any Additional Stock (as defined below) without consideration or for a
consideration per share less than the Closing Price on such date, the Conversion
Price for such series in effect immediately prior to each such issuance shall
forthwith (except as otherwise provided in this clause (i)) be adjusted to a
price equal to a price determined by multiplying such Conversion Price by a
fraction, the numerator of which shall be the sum of (w) the number of shares of
Common Stock outstanding immediately prior to such issuance (assuming the
conversion of all then outstanding shares of Series C Convertible Preferred
Stock and including shares issued or issuable pursuant to Section 5(d)(ii)(B))
and (x) the number of shares of Common Stock that the aggregate consideration
received by the Corporation for such issuance would purchase at such Conversion
Price; and the denominator of which shall be the sum of (y) the number of shares
of Common Stock outstanding immediately prior to such issuance (assuming the
conversion of all then outstanding shares of Series C Convertible Preferred
Stock and including shares issued or issuable pursuant to Section 5(d)(ii)(B))
and (z) the number of shares of such Additional Stock.

                         (B)  No adjustment of the Conversion Price for the
Series C Convertible Preferred Stock shall be made in an amount less than one
cent per share, provided that any adjustments which are not required to be made
by reason of this sentence shall be carried forward and shall be either taken
into account in any subsequent adjustment made prior to three (3) years from the
date of the event giving rise to the adjustment being carried forward, or shall
be made at the end of three (3) years from the date of the event giving rise to
the adjustment being carried forward. Except to the limited extent provided for
in subsections (E)(3) and (E)(4), no adjustment of such Conversion Price
pursuant to this subsection 5(d)(i) shall have the effect of increasing the
Conversion Price above the Conversion Price in effect immediately prior to such
adjustment.

                                       6
<PAGE>
 
                         (C)  In the case of the issuance of Common Stock for
cash, the consideration shall be deemed to be the amount of cash paid therefor
before deducting any reasonable discounts, commissions or other expenses
allowed, paid or incurred by the Corporation for any underwriting or otherwise
in connection with the issuance and sale thereof.

                         (D)  In the case of the issuance of the Common Stock
for a consideration in whole or in part other than cash, the consideration other
than cash shall be deemed to be the fair value thereof as determined by the
Board of Directors irrespective of any accounting treatment.

                         (E)  In the case of the issuance (whether before, on or
after the applicable Purchase Date) of options to purchase or rights to
subscribe for Common Stock, securities by their terms convertible into or
exchangeable for Common Stock or options to purchase or rights to subscribe for
such convertible or exchangeable securities, the following provisions shall
apply for all purposes of this subsection 5(d)(i) and subsection 5(d)(ii):

                              (1)  The aggregate maximum number of shares of
Common Stock deliverable upon exercise (to the extent then exercisable) of such
options to purchase or rights to subscribe for Common Stock shall be deemed to
have been issued at the time such options or rights were issued and for a
consideration equal to the consideration (determined in the manner provided in
subsections 5(d)(i)(C) and (d)(i)(D)), if any, received by the Corporation upon
the issuance of such options or rights plus the minimum exercise price provided
in such options or rights for the Common Stock covered thereby.

                              (2)  The aggregate maximum number of shares of
Common Stock deliverable upon conversion of or in exchange (to the extent then
convertible or exchangeable) for any such convertible or exchangeable securities
or upon the exercise of options to purchase or rights to subscribe for such
convertible or exchangeable securities and subsequent conversion or exchange
thereof shall be deemed to have been issued at the time such securities were
issued or such options or rights were issued and for a consideration equal to
the consideration, if any, received by the Corporation for any such securities
and related options or rights (excluding any cash received on account of accrued
interest or accrued dividends), plus the minimum additional consideration, if
any, to be received by the Corporation upon the conversion or exchange of such
securities or the exercise of any related options or rights (the consideration
in each case to be determined in the manner provided in subsections 5(d)(i)(C)
and (d)(i)(D)).

                              (3)  In the event of any change in the number of
shares of Common Stock deliverable or in the consideration payable to the
Corporation upon exercise of such options or rights or upon conversion of or in
exchange for such convertible or exchangeable securities, including, but not
limited to, a change resulting from the antidilution provisions thereof, the
Conversion Price of the Series C Convertible Preferred Stock, to the extent in
any way affected by or computed using such options, rights or securities, shall
be recomputed to reflect such change, but no further adjustment shall be made
for the actual issuance of Common Stock or any payment of such consideration
upon the exercise of any such options or rights or the conversion or exchange of
such securities.

                                       7
<PAGE>
 
                              (4)  Upon the expiration of any such options or
rights, the termination of any such rights to convert or exchange or the
expiration of any options or rights related to such convertible or exchangeable
securities, the Conversion Price of the Series C Convertible Preferred Stock, to
the extent in any way affected by or computed using such options, rights or
securities or options or rights related to such securities, shall be recomputed
to reflect the issuance of only the number of shares of Common Stock (and
convertible or exchangeable securities which remain in effect) actually issued
upon the exercise of such options or rights, upon the conversion or exchange of
such securities or upon the exercise of the options or rights related to such
securities.

                              (5)  The number of shares of Common Stock deemed
issued and the consideration deemed paid therefor pursuant to subsections
5(d)(i)(E)(1) and (2) shall be appropriately adjusted to reflect any change,
termination or expiration of the type described in either subsection
5(d)(i)(E)(3) or (4).

               (ii)   "Additional Stock" shall mean any shares of Common Stock
issued (or deemed to have been issued pursuant to subsection 5(d)(i)(E)) by the
Corporation after the Purchase Date to Affiliates of the Corporation or
directors, officers, employees or agents of such Affiliates, other than shares
of Common Stock issuable or issued to employees, consultants or directors of the
Corporation directly or pursuant to a stock option plan or restricted stock plan
approved by the Board of Directors of the Corporation (provided that the sum of
such number of shares of Common Stock issuable or issued pursuant to such stock
option plan or restricted stock plan shall in no event represent more than
fifteen percent (15%) of the authorized number of shares of Common Stock).
"Affiliates" shall mean, with respect to any party, any entity that, directly or
indirectly through one or more intermediaries, controls or is controlled by or
is under common control with such party.  For purposes of this definition,
"control" means the power to direct or cause the direction of the management and
policies of an entity, whether through the ownership of voting securities, by
contract or otherwise.

               (iii)  In the event the Corporation should at any time or from
time to time after the Purchase Date fix a record date for the effectuation of a
split or subdivision of the outstanding shares of Common Stock or the
determination of holders of Common Stock entitled to receive a dividend or other
distribution payable in additional shares of Common Stock or other securities or
rights convertible into, or entitling the holder thereof to receive directly or
indirectly, additional shares of Common Stock (hereinafter referred to as
"Common Stock Equivalents") without payment of any consideration by such holder
for the additional shares of Common Stock or the Common Stock Equivalents
(including the additional shares of Common Stock issuable upon conversion or
exercise thereof), then, as of such record date (or the date of such dividend
distribution, split or subdivision if no record date is fixed), the Conversion
Price of the Series C Convertible Preferred Stock shall be appropriately
decreased so that the number of shares of Common Stock issuable on conversion of
each share of such series shall be increased in proportion to such increase of
the aggregate of shares of Common Stock outstanding and those issuable with
respect to such Common Stock Equivalents with the number of shares issuable with
respect to Common Stock Equivalents determined from time to time in the manner
provided for deemed issuances in subsection 5(d)(i)(E).

                                       8
<PAGE>
 
               (iv)   If the number of shares of Common Stock outstanding at any
time after the Purchase Date is decreased by a combination of the outstanding
shares of Common Stock, then, following the record date of such combination, the
Conversion Price for the Series C Convertible Preferred Stock shall be
appropriately increased so that the number of shares of Common Stock issuable on
conversion of each share of such series shall be decreased in proportion to such
decrease in outstanding shares.

          (e)  Other Distributions. In the event the Corporation shall declare a
               -------------------  
distribution payable in securities of other persons, evidences of indebtedness
issued by the Corporation or other persons, assets (excluding cash dividends) or
options or rights not referred to in subsection 5(d)(iii), then, in each such
case for the purpose of this subsection 5(e), the holders of the Series C
Convertible Preferred Stock shall be entitled to a proportionate share of any
such distribution as though they were the holders of the number of shares of
Common Stock of the Corporation into which their shares of Series C Convertible
Preferred Stock are convertible as of the record date fixed for the
determination of the holders of Common Stock of the Corporation entitled to
receive such distribution.

          (f)  Recapitalizations. If at any time or from time to time there
               -----------------
shall be a recapitalization of the Common Stock (other than a subdivision,
combination or merger or sale of assets transaction provided for elsewhere in
this Section 5 or Section 3) provision shall be made so that the holders of the
Series C Convertible Preferred Stock shall thereafter be entitled to receive
upon conversion of the Series C Convertible Preferred Stock the number of shares
of stock or other securities or property of the Corporation or otherwise, to
which a holder of Common Stock deliverable upon conversion would have been
entitled on such recapitalization. In any such case, appropriate adjustment
shall be made in the application of the provisions of this Section 5 with
respect to the rights of the holders of the Series C Convertible Preferred Stock
after the recapitalization to the end that the provisions of this Section 5
(including adjustment of the Conversion Price then in effect and the number of
shares purchasable upon conversion of the Series C Convertible Preferred Stock)
shall be applicable after that event as nearly equivalent as may be practicable.

          (g)  No Impairment.  The Corporation will not, by amendment of its
               -------------                                                
Certificate of Incorporation or through any reorganization, recapitalization,
transfer of assets, consolidation, merger, dissolution, issue or sale of
securities or any other voluntary action, avoid or seek to avoid the observance
or performance of any of the terms to be observed or performed hereunder by the
Corporation, but will at all times in good faith assist in the carrying out of
all the provisions of this Section 5 and in the taking of all such action as may
be necessary or appropriate in order to protect the Conversion Rights of the
holders of the Series C Convertible Preferred Stock against impairment.

          (h)  No Fractional Shares and Certificate as to Adjustments.
               ------------------------------------------------------ 

               (i)    No fractional shares shall be issued upon the conversion
of any share or shares of the Series C Convertible Preferred Stock, and the
number of shares of Common Stock to be issued shall be rounded to the nearest
whole share. Whether or not fractional shares are issuable upon such conversion
shall be determined on the basis of the total number of shares of Series C
Convertible Preferred Stock the holder is at the time converting 

                                       9
<PAGE>
 
into Common Stock and the number of shares of Common Stock issuable upon such
aggregate conversion.

               (ii)   Upon the occurrence of each adjustment or readjustment of
the Conversion Price of Series C Convertible Preferred Stock pursuant to this
Section 5, the Corporation, at its expense, shall promptly compute such
adjustment or readjustment in accordance with the terms hereof and prepare and
furnish to each holder of Series C Convertible Preferred Stock a certificate
setting forth such adjustment or readjustment and showing in detail the facts
upon which such adjustment or readjustment is based. The Corporation shall, upon
the written request at any time of any holder of Series C Convertible Preferred
Stock, furnish or cause to be furnished to such holder a like certificate
setting forth (A) such adjustment and readjustment, (B) the Conversion Price for
such series of Preferred Stock at the time in effect, and (C) the number of
shares of Common Stock and the amount, if any, of other property which at the
time would be received upon the conversion of a share of Series C Convertible
Preferred Stock.

          (i)  Notices of Record Date.  In the event of any taking by the
               ----------------------                                    
Corporation of a record of the holders of any class of securities for the
purpose of determining the holders thereof who are entitled to receive any
dividend (other than a cash dividend) or other distribution, any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class or
any other securities or property, or to receive any other right, the Corporation
shall mail to each holder of Series C Convertible Preferred Stock, at least
twenty (20) days prior to the date specified therein, a notice specifying the
date on which any such record is to be taken for the purpose of such dividend,
distribution or right, and the amount and character of such dividend,
distribution or right.

          (j)  Reservation of Stock Issuable Upon Conversion.  The Corporation
               ---------------------------------------------                  
shall at all times reserve and keep available out of its authorized but unissued
shares of Common Stock, solely for the purpose of effecting the conversion of
the shares of the Series C Convertible Preferred Stock, such number of its
shares of Common Stock as shall from time to time be sufficient to effect the
conversion of all outstanding shares of the Series C Convertible Preferred
Stock; and if at any time the number of authorized but unissued shares of Common
Stock shall not be sufficient to effect the conversion of all then outstanding
shares of the Series C Convertible Preferred Stock, in addition to such other
remedies as shall be available to the holder of such Preferred Stock, the
Corporation will take such corporate action as may, in the opinion of its
counsel, be necessary to increase its authorized but unissued shares of Common
Stock to such number of shares as shall be sufficient for such purposes,
including, without limitation, engaging in best efforts to obtain the requisite
stockholder approval of any necessary amendment to the Certificate of
Incorporation, as amended.

          (k)  Notices. Any notice required by the provisions of this Section 5
               -------  
to be given to the holders of shares of Series C Convertible Preferred Stock
shall be deemed given (i) on the date of service if served personally on the
party to whom notice is to be given, or (ii) on the date of transmittal of such
notice if sent via telecopy to the party to whom notice is to be given and
addressed to each holder of record at his address appearing on the books of the
Corporation, or (iii) two business days following the date of mailing if such
notice is sent by recognized overnight courier or by regular postal service.

                                      10
<PAGE>
 
     6.     Voting Rights.  In any vote by the holders of the Series C
            -------------                                             
Convertible Preferred Stock acting as a class, each holder of Series C
Convertible Preferred Stock shall be entitled to one (1) vote for each share of
Series C Convertible Preferred Stock.

     7.     Protective Provisions.  Subject to the rights of any series of
            ---------------------                                         
Preferred Stock which may from time to time come into existence, so long as any
shares of Series C Convertible Preferred Stock are outstanding, the Corporation
shall not without first obtaining the approval (by vote or written consent, as
provided by law) of the holders of at least a majority of the then outstanding
shares of Series C Convertible Preferred Stock, voting separately as a class:

               (i)  increase or decrease the authorized or outstanding number of
the shares of Series C Convertible Preferred Stock, respectively, so as to
affect adversely the shares; or

               (ii) authorize or issue any other equity security, or security
convertible into or exercisable for any equity security, having a preference
over, or being on a parity with, the Series C Convertible Preferred Stock with
respect to voting, dividends, liquidation or redemption, respectively.

     8.     Status of Converted or Exchanged Stock.  In the event any shares of
            --------------------------------------                             
Series C Convertible Preferred Stock shall be exchanged pursuant to Section 4 or
converted pursuant to Section 5 hereof, the shares so exchanged or converted
shall be cancelled and shall not be reissuable by the Corporation.  The
Certificate of Incorporation, as amended, of the Corporation shall be
appropriately amended to effect the corresponding reduction in the Corporation's
authorized capital stock.



                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      11
<PAGE>
 
                                                                       EXHIBIT A

          IN WITNESS WHEREOF, the Corporation has caused this Certificate of
Designations, Preferences and Rights to be duly executed by its President and
Chief Executive Officer and attested to by its Secretary this 20th day of
October, 1998.

                                        ENDOREX CORP.

                                        By:  /s/ Michael S. Rosen
                                             --------------------
                                        Name:  Michael S. Rosen
                                        Title: President and Chief Executive
                                                Officer

ATTEST:

By:  /s/ David G. Franckowiak
     ------------------------
Name:  David G. Franckowiak
Title: Secretary
<PAGE>
 
                                                                       EXHIBIT B

NEITHER THIS CONVERTIBLE PROMISSORY NOTE NOR THE SHARES OF COMMON STOCK ISSUABLE
UPON CONVERSION HEREOF HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, OR ANY APPLICABLE STATE SECURITIES LAWS. NO SALE, TRANSFER OR OTHER
DISPOSITION OF THIS NOTE OR OF ANY SHARES OF COMMON STOCK ISSUED PURSUANT HERETO
MAY BE EFFECTED WITHOUT (I) AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO,
OR (II) AN OPINION OF COUNSEL FOR THE HOLDER, REASONABLY SATISFACTORY IN FORM
AND CONTENT TO THE COMPANY, THAT SUCH REGISTRATION IS NOT REQUIRED.

                                 ENDOREX CORP.

                          CONVERTIBLE PROMISSORY NOTE

MAXIMUM U.S. $4,806,000                                       OCTOBER 21, 1998
                                                              NEW YORK, NEW YORK

          The undersigned, ENDOREX CORP., a Delaware corporation with offices at
900 North Shore Drive, Lake Bluff, Illinois 60044 ("Endorex"), unconditionally
promises to pay to ELAN INTERNATIONAL SERVICES, LTD., a Bermuda corporation
("EIS"), or any of its successors or assigns or any other holder of this Note
(collectively, the "Holder"), on December 31, 2005 (the "Maturity Date"), at
such place as may be designated by the Holder to Endorex, the principal amount
outstanding hereunder (not to exceed U.S.$4,806,000), together with interest
thereon accrued at a rate per annum equal to the lesser of (x) 7% and (y) the
maximum rate of interest permitted by applicable law, from and after the date of
the initial disbursement of funds (the "Original Issue Date"), compounded on a
semi-annual basis, the initial such compounding to take place on the date which
is six months from and after the Original Issue Date (each such date, a
"Compounding Date").

     SECTION 1.  SECURITIES PURCHASE AND JOINT DEVELOPMENT AND OPERATING
                 -------------------------------------------------------  
                 AGREEMENTS; DISBURSEMENTS
                 -------------------------

     (a) This Note is issued pursuant to a securities purchase agreement dated
as of the date hereof by and between Endorex and EIS (the "Securities Purchase
Agreement").  This Note is the Promissory Note referred to in the Securities
Purchase Agreement and the Holder is intended to be afforded the benefits
thereof, including the representations and warranties set forth by Endorex
therein.  Endorex shall use the proceeds of the issuance and sale of this Note
solely in accordance with the provisions set forth in that certain Joint
Development and Operating Agreement, dated as of the date hereof, by and among
Elan Corporation, plc, EIS, Endorex and Endorex Newco, Ltd. ("Newco") (the
"Joint Development and Operating Agreement"), and as described in Section 5
below.

     (b) Disbursements shall be made to Endorex hereunder in minimum increments
of $500,000 (except in the event that an amount less than $500,000 shall be
remaining and available for funding hereunder, in which case such lesser amount
may be funded hereunder) as follows: (X) from January 1, 2000 until December 31,
2000, up to a maximum of $3,204,000, and (Y)
<PAGE>
 
from January 1, 2001 until December 31, 2001, up to a maximum of an additional
$1,602,000. The Holder shall not be required to make more than one disbursement
per calendar quarter.

          (c) The Holder shall not be obliged to disburse more than an aggregate
principal amount of $4,806,000 hereunder.

          (d) In order to receive a disbursement hereunder, Endorex shall
provide notice thereof to the Holder in the form attached hereto as Exhibit A
                                                                    ---------
(the "Disbursement Notice"); the Holder shall, subject to the terms and
conditions hereof, fund such amount within five business days of the receipt of
such notice.

     SECTION 2.   PAYMENTS
                  --------

          (a) Unless earlier converted in accordance with the terms of Section 3
below, canceled in accordance with Section 4 below, or prepaid in accordance
with the terms hereof, the entire outstanding principal amount of this Note,
together with any accrued and unpaid interest thereon, shall be due and payable
on the Maturity Date.

          (b) Accrued interest hereon shall not be paid in cash, but shall be
capitalized and added to principal amount outstanding hereunder on each
Compounding Date.

          (c) Any disbursements, together with accrued and unpaid interest
thereon, under this Note may be prepaid by Endorex at any time, in whole or in
part, upon five days written notice to the Holder.

     SECTION 3.   CONVERSION
                  ----------

          (a) From and after the Original Issue Date and until this Note is
repaid in full, the Holder shall have the right from time to time, in its sole
discretion, to convert the outstanding principal amount and accrued and unpaid
interest then-outstanding hereunder into shares of the common stock of Endorex,
par value $.001 per share (the "Common Stock"), at a conversion price of $5.70
per share, subject to appropriate adjustment for stock splits, reverse stock
splits and recapitalizations. Any principal amount outstanding hereunder which
is converted into shares of Common Stock pursuant to the previous sentence shall
at all times (i) be deemed borrowings hereunder for purposes of calculating the
maximum principal amount of borrowings permitted hereunder of $4,806,000 and
(ii) be deemed repaid for all other purposes.

          (b) The Holder shall be entitled to exercise the rights of conversion
as described in this Section 3 upon 30 days notice to Endorex, such notice to be
in the form attached hereto as Exhibit B.
                               ---------

     SECTION 4.   CONDITIONS TO FUNDING
                  --------------------- 

          It shall be a condition of the Holder's funding obligations hereunder
that at any time Endorex shall present a Disbursement Notice to the Holder,
Endorex shall not be in default or breach in any material respect under (a)
Section 7 hereof, (b) Section 2 or 4 of the Securities Purchase Agreement or (c)
any section of license agreement dated as of the date hereof between Endorex and
Newco.

                                       2
<PAGE>
 
     SECTION 5.   CANCELLATION
                  ------------

          (a) In the event that EIS shall exercise its right of exchange in
respect of the Series C Preferred Stock issued by the Company to EIS pursuant to
the terms of the Securities Purchase Agreement, as such right is described
therein, an amount outstanding hereunder equal to the sum of (X) an amount
necessary to make the amount of Development Funding provided by each of the
parties to Newco in accordance with the terms of the Joint Development and
Operating Agreement equal, and (Y) 3.5% of the amount determined in accordance
with clause (X) above, shall be canceled upon the closing of such exchange.

          (b) In no event shall the amount determined in accordance with
subsection (a) above exceed the aggregate principal amount issued hereunder and
accrued interest thereon.

     SECTION 6.   USE OF PROCEEDS
                  ---------------

          Endorex shall use the proceeds of this Note solely to fund its
obligations to Newco in accordance with a duly authorized Newco Research and
Development Plan, as described in the Joint Development and Operating Agreement.

     SECTION 7.   EVENTS OF DEFAULT
                  -----------------

          The occurrence of any of the following events shall constitute an
event of default (an "Event of Default"):

          (a) a default in the payment of the principal amount of this Note,
when and as the same shall become due and payable;

          (b) a default in the payment of any accrued and unpaid interest on any
Note, when and as the same shall become due and payable;

          (c) a default in the performance, or a breach of any other covenant or
agreement of Endorex contained in this Note, and continuance of such default or
breach for a period of 10 days after the Holder has notified Endorex of its
occurrence;

          (d) any representation, warranty or certification made by Endorex
pursuant to this Note, or any other Transaction Document shall prove to have
been false or misleading as of the date made in any material respect and EIS has
asserted a claim for indemnity in respect thereof;

          (e) (i)  the entry of a decree or order by a court having jurisdiction
adjudging Endorex bankrupt or insolvent, or approving a petition seeking
reorganization, arrangement, adjustment or composition of or in respect of
Endorex, under United States bankruptcy or insolvency law, as now or hereafter
constituted, and the continuance of any such decree or order unstayed and in
effect for a period of 120 days; (ii) the commencement by Endorex of a voluntary
case under United States bankruptcy law, as now or hereafter constituted, or the
consent by Endorex to the institution of bankruptcy or insolvency proceedings
against it; (iii) the filing by Endorex of a petition or answer or consent
seeking reorganization or relief under United States bankruptcy law; (v) the
appointment of a receiver, liquidator, assignee, trustee, or similar official of
Endorex or of any substantial part of its property which is not discharged
within 120

                                       3
<PAGE>
 
days; (vi) the making by Endorex of an assignment for the benefit of creditors,
or the admission by it in writing of its inability to pay its debts generally as
they become due, or the taking of corporate action by Endorex in furtherance of
any such action; or

          (f) a material default by Endorex under any of the Transaction
Documents and continuance of such default for a period of 30 days after the
Holder has notified Endorex of its occurrence.

     SECTION 8.   REMEDIES IN THE EVENT OF DEFAULT
                  --------------------------------

          (a) In the case of any Event of Default by Endorex, the aggregate
amount of funds advanced to Endorex under this Note and outstanding hereunder
and accrued and unpaid interest thereon shall, in addition to all other rights
and remedies of the Holder hereunder and under applicable law, be and become
immediately due and payable upon written notice delivered by Holder to Endorex.

          (b) Endorex hereby waives demand and presentment for payment, notice
of nonpayment, protest and notice of protest, diligence, filing suit, and all
other notice and promises to pay the Holder its costs of collection of all
amounts due hereunder, including reasonable attorneys' fees.

          (c) In the case of any Event of Default or breach of this Note by
Endorex this Note shall continue to bear interest after such default or breach
at the interest rate otherwise in effect hereunder plus 3% per annum (but in any
event not in excess of the maximum rate of interest permitted by applicable
law).

     SECTION 9.   SENIORITY
                  ---------

          This Note shall constitute senior indebtedness of Endorex, and Endorex
shall not incur any indebtedness for money borrowed which shall rank senior to
this Note without the prior consent of the Holder; provided, that (i) nothing
contained herein shall be construed as to prevent Endorex from (a) incurring and
paying obligations in the ordinary course of business, in accordance with past
practice or (b) incurring any obligations which rank pari passu with the
obligations evidenced hereby and (ii) Endorex may incur up to $1,000,000
aggregate principal amount of senior indebtedness, equipment financing and
mortgages incurred in connection with the acquisition of assets that may be
senior to this Note, provided that in the case of equipment financing and
mortgages the fair market value of the relevant assets acquired exceeds the
outstanding principal amount of such indebtedness at the time the indebtedness
is to be incurred.

     SECTION 10.  MISCELLANEOUS
                  -------------

          (a) EIS may assign or transfer this Note to its affiliates or other
entities in which any affiliates of EIS may have a contractual or equity
interest (so long as EIS acts as agent or nominee for determinations hereunder);
provided, however, that EIS shall remain liable for its obligations hereunder
after any such assignment.  This Note and all of the provisions hereof shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns; provided, however, that EIS and Endorex shall remain
liable for their respective obligations hereunder after any such assignment or
transfer.

                                       4
<PAGE>
 
          (b) All notices, demands and requests of any kind to be delivered to
any party in connection with this Agreement shall be in writing and shall be
deemed to have been duly given if personally delivered or if sent by nationally-
recognized overnight courier or by registered or certified airmail, return
receipt requested and postage prepaid, addressed as follows:

               (i)       if to Endorex:                          
                                                                 
                         Endorex Corp.                           
                         900 North Shore Drive                   
                         Lake Bluff, Illinois 60044              
                         Attn: President                         
                                                                 
               with a copy to:                                   
                         Brobeck, Phleger & Harrison LLP         
                         1633 Broadway, 47/th/ Floor             
                         New York, New York 10019                
                         Attention: Nigel L. Howard, Esq.        
                                                                 
               (ii)      if to EIS, to:                          
                                                                 
                         Elan International Services, Ltd.       
                         102 St. James Court                     
                         Flatts, Smiths Parish                   
                         Bermuda  SL04                           
                         Attention: Director                     
                                                                 
                         with a copy to:                         
                                                                 
                         Brock Silverstein McAuliffe LLC         
                         153 East 53rd Street                    
                         New York, New York 10022                
                         Attention: David Robbins, Esq.           

          Each party, by written notice given to the other in accordance with
this Section 10(b) may change the address to which notices, other communication
or documents are to be sent to such party.  All notices, other communications or
documents shall be deemed to have been duly given when received. Any such notice
or communication shall be deemed to have been received (iv) in the case of
personal delivery, on the date of such delivery, (v) in the case of nationally-
recognized overnight courier, on the second business day after the date when
sent and (vi) in the case of mailing, on the fifth business day following that
day on which the piece of mail containing such communication is posted.  Notice
hereunder may be given on behalf of the parties by their respective attorneys.

          (c) This Note may not be modified or amended, or any of the provisions
hereof waived, except by written agreement of the Company and EIS.

                                       5
<PAGE>
 
          (d) This Note shall be governed by and construed in accordance with
the laws of the State of New York, without giving effect to the principles
thereof relating to conflicts of laws.

                           [Signature page follows]

                                       6
<PAGE>
 
          IN WITNESS WHEREOF, Endorex and EIS have executed this Note on the
date first above written.

                    Endorex Corp.


                    By:  /s/ David G. Franckowiak
                         ------------------------
                         Name:  David G. Franckowiak
                         Title: Vice President, Finance and
                                 Administration


                    ELAN INTERNATIONAL SERVICES, LTD.


                    By:  /s/ Kevin Insley
                         ----------------
                         Name:  Kevin Insley
                         Title:  President and Chief Financial Officer

                                       7
<PAGE>
 
                                   EXHIBIT A

                      NOTICE OF REQUEST FOR DISBURSEMENT

Date:
To:    Elan International Services, Ltd.
From:  Endorex Corp.
Re:    Disbursement Request

________________________________________________________________________________
Pursuant to the terms of the Convertible Promissory Note issued by Endorex Corp.
("Endorex") to Elan International Services, Ltd. ("EIS"), dated October 21,
1998, Endorex hereby notifies EIS of its request for a disbursement thereunder
in the amount of $__________.  Please provide funding in the requested amount to
Endorex in accordance with the following wire instructions:

               [



                                    ]

                         Sincerely,

                         ENDOREX CORP.



                         By:_____________________________________
                            Name:
                            Title:
<PAGE>
 
                                   EXHIBIT B

              NOTICE OF ELECTION TO EXERCISE THE CONVERSION RIGHT
              ---------------------------------------------------

Date:
To:    Endorex Corp.
From:  Elan International Services, Ltd.
Re:    Exercise of the Conversion Right

________________________________________________________________________________

          Pursuant to the terms of the Convertible Promissory Note (the "Note")
issued by Endorex Corp. ("Endorex") to Elan International Services, Ltd.
("EIS"), dated October 21, 1998, specifically Section 3 thereof, EIS hereby
notifies Endorex of its intention to exercise its right of conversion.

          Pursuant to Section 3 of the Note, EIS hereby elects to convert the
principal and all accrued and unpaid interest on the Note for shares of the
common stock of Endorex, par value $.001 per share, based upon a conversion rate
of $5.70 per share.

          We have instructed our attorneys to contact Endorex to discuss the
timing and documentation of the conversion.

                              Sincerely,


                              ELAN INTERNATIONAL SERVICES, LTD.


                              By:___________________________________
                                 Name:
                                 Title:

<PAGE>
 
                                                                   EXHIBIT 10.22


                                 ENDOREX CORP.
                         REGISTRATION RIGHTS AGREEMENT
                         -----------------------------

          THIS REGISTRATION RIGHTS AGREEMENT is made as of October 21, 1998 by
and among ENDOREX CORP., a Delaware corporation (the "Company"), and ELAN
INTERNATIONAL SERVICES, LTD., a Bermuda corporation ("EIS").

                               R E C I T A L S:

          A.   Pursuant to a securities purchase agreement dated as of the date
hereof by and between the Company and EIS (the "Securities Purchase Agreement"),
EIS has (x) acquired certain shares of Series C preferred stock (the "Preferred
Stock"), which Preferred Stock is convertible and may be converted into shares
of common stock, par value $.001 per share (the "Common Stock") of the Company,
and (y) entered into a promissory note (the "Convertible Note"), all or a
portion of the principal amount of which may be converted into shares of Common
Stock.

          B.   The execution of the Securities Purchase Agreement has occurred
on the date hereof; it being a condition to the closing of the transactions
contemplated thereby that the parties execute and deliver this Agreement.

          C.   The parties desire to set forth herein their agreement related to
the granting of certain registration rights to the Holders (as defined below) of
any Common Stock or securities convertible, exercisable or exchangeable for or
into Common Stock.

                              A G R E E M E N T:

          The parties hereto agree as follows:

          1.   Certain Definitions.  As used in this Agreement, the following
               -------------------                                           
terms shall have the following respective meanings:

          "Affiliate" of any Person shall mean any other Person controlling,
controlled by or under common control with such particular Person.  In the case
of a natural Person, his Affiliates include members of such Person's immediate
family, natural lineal descendants of such Person or a trust for the exclusive
benefit of such Person and his immediate family and natural lineal descendants.

          "Commission" shall mean the Securities and Exchange Commission or any
other federal agency at the time administering the Securities Act.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, or any similar federal statute and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.
<PAGE>
 
          "Holders", "holders" or "Holders of Registrable Securities" shall mean
EIS and any Person who shall have acquired Registrable Securities from EIS as
permitted herein, either individually or jointly as the case may be.

          "Person" shall mean an individual, a partnership, a company, an
association, a joint stock company, a trust, a joint venture, an unincorporated
organization and a governmental quasi-governmental entity or any department,
agency or political subdivision thereof.

          "Registrable Securities" means (i) any Common Stock issued or issuable
upon conversion of or in connection with the holding of the Preferred Stock or
the Convertible Note, and (ii) any Common Stock issued or issuable in respect of
the securities referred to in clause (i) above upon any stock split, stock
dividend, recapitalization or similar event; excluding in all cases, however,
any Registrable Securities sold by a Person in a transaction (including a
transaction pursuant to a registration statement under this Agreement and
transaction pursuant to Rule 144 promulgated under the Securities Act) in which
registration rights are not transferred pursuant to Section 9 hereof.

          The terms "register," "registered" and "registration" refer to a
registration effected by preparing and filing a registration statement in
compliance with the Securities Act, and the declaration or ordering of the
effectiveness of such registration statement.

          "Registration Expenses" shall mean all expenses, other than Selling
Expenses, incurred by the Company in complying with Sections 2 or 3 hereof,
including without limitation, all registration, qualification and filing fees,
exchange listing fees, printing expenses, escrow fees, fees and disbursements of
counsel for the Company, blue sky fees and expenses, the expense of any special
audits incident to or required by any such registration and the reasonable fees
and disbursements, not to exceed $10,000 in the aggregate, of one counsel for
the Holders, such counsel to be selected by Holders holding a majority of the
Registrable Securities held by the Holders and included in such registration.

          "Securities Act" shall mean the Securities Act of 1933, as amended, or
any similar federal statute and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

          "Selling Expenses" shall mean all underwriting discounts, selling
commissions and stock transfer taxes applicable to the securities registered by
the Holders and the costs of any accountants, counsel or other experts retained
by the Holders.

          2.   Demand Registrations.
               -------------------- 

               (a)  Requests for Registration. Any Holder or Holders who
                    -------------------------   
collectively hold Registrable Securities representing at least 25% of the
Registered Securities then outstanding shall have the right at any time from
time to time, to request registration under the Securities Act of all or part of
their Registrable Securities on Form S-1, S-2 or S-3 (if available) or any
similar registration (each, a "Demand Registration"), such form to be selected
by the Company. Each written request for a Demand Registration shall specify the
approximate number of Registrable Securities requested to be registered. Within
10 days after receipt of any such request, the Company will give written notice
of such requested registration to all other

                                       2
<PAGE>
 
Holders of Registrable Securities and, if they request to be included in such
registration, the Company shall include such Holders' Registrable Securities in
such offering if they have responded affirmatively within 10 days after the
receipt of the Company's notice. The Holders in aggregate will be entitled to
request two Demand Registrations. A registration will not count as one of the
permitted Demand Registration until it has become effective (unless such Demand
Registration has not become effective due solely to the fault of the Holders
requesting such registration, including a request by such Holders that such
registration be withdrawn). The Company will pay all Registration Expenses in
connection with any Demand Registration whether or not such Demand Registration
has become effective; provided, that the Company shall not be obligated to pay
such Registration Expenses if the Demand Registration has not become effective
due to the fault of the Holders requesting such registration.

               (b)  Priority on Demand Registrations. If a Demand Registration
                    --------------------------------   
is an underwritten offering and the managing underwriters advise the Company in
writing that in their opinion the number of Registrable Securities and, if
permitted hereunder, other securities requested to be included in such offering,
exceeds the number of Registrable Securities and other securities, if any, which
can be sold in such offering without adversely affecting the marketability of
the offering, the Company will include in such registration:

                    (i)  first, the Registrable Securities requested to be
included in such registration by the Holders (or, if necessary, such Registrable
Securities pro rata among the Holders thereof based upon the number of
Registrable Securities owned by each such Holder) together with any securities
held by third parties holding a similar, previously granted right to be included
in such registration; and

                    (ii) thereafter, other securities requested to be included
in such registration.

               (c)  Restrictions on Demand Registrations. The Company may
                    ------------------------------------   
postpone for up to six months in any 12 month period, the filing or the
effectiveness of a registration statement for a Demand Registration if the
Company determines in good faith that such Demand Registration would reasonably
be expected to have a material adverse effect on any proposal or plan by the
Company to engage in any financing, acquisition or disposition of assets (other
than in the ordinary course of business) or any merger, consolidation, tender
offer or similar transaction or would require disclosure of any information that
the board of directors of the Company determines in good faith the disclosure of
which would be detrimental to the Company; provided that in such event, the
Holders initially requesting such Demand Registration will be entitled to
withdraw such request and, if such request is withdrawn, such Demand
Registration will not count as one of the permitted Demand Registrations
hereunder and the Company will pay any Registration Expenses in connection with
such registration.

               (d)  Selection of Underwriters. The Holders will have the right
                    -------------------------   
to select the investment banker(s) and manager(s) to administer an offering
pursuant to a Demand Registration, subject to the Company's approval, which will
not be unreasonably withheld.

               (e)  Other Registration Rights. Except as provided in this
                    -------------------------   
Agreement, so long as any Holder owns any Registrable Securities, the Company
will not grant to any

                                       3
<PAGE>
 
Persons the right to request the Company to register any equity securities of
the Company, or any securities convertible or exchangeable into or exercisable
for such securities, which is in conflict with the rights granted to the Holders
hereunder, without the prior written consent of the Holders of at least 50% of
the Registrable Securities held by the Holders; it being understood that the
Company may grant rights to other Persons to (i) participate in Piggyback
Registrations so long as such rights are subordinate or pari passu to the rights
of the holders of Registrable Securities with respect to such Piggyback
Registrations and (ii) demand registrations so long as the Holders of
Registrable Securities are entitled to participate in any such registrations
with such Persons pro rata on the basis of the number of shares owned by each
such Holder.

          3.   Piggyback Registrations.
               ----------------------- 

               (a)  Right to Piggyback. At any time the Company shall propose to
                    -------------------   
register Common Stock under the Securities Act (other than in a registration on
Form S-3 relating to sales of securities to participants in a Company dividend
reinvestment plan, S-4 or S-8 or any successor form or in connection with an
acquisition or exchange offer or an offering of securities solely to the
existing stockholders or employees of the Company) (each, a "Piggyback
Registration"), the Company will give prompt written notice to all Holders of
Registrable Securities of its intention to effect such a registration and,
subject to Section 3(b) and the other terms of this Agreement, will include in
such registration all Registrable Securities which are permitted under
applicable securities laws to be included in the form of registration statement
selected by the Company and with respect to which the Company has received
written requests for inclusion therein within 15 days after the receipt of the
Company's notice.

               (b)  Priority on Piggyback Registrations. If a Piggyback
                    -----------------------------------   
Registration is an underwritten registration on behalf of the Company, and the
managing underwriters advise the Company in writing that in their opinion the
number of securities requested to be included in such registration exceeds the
number which can be sold in such offering without adversely affecting the
marketability of the offering, the Company will include in such registration:

                    (i)   first, the securities the Company proposes to sell;

                    (ii)  any securities having the right to be included in such
registration prior to the securities of the Holders;

                    (iii) the Registrable Securities requested to be included in
such registration by the Holders and any securities requested to be included in
such registration by any other Person, pro rata among the Holders of such
Registrable Securities and such other Persons, on the basis of the number of
shares owned by each of such Holders; and

                    (iv)  thereafter, other securities requested to be included
in such registration.

          The Holders of any Registrable Securities included in such a
registration must execute an underwriting agreement in form and substance
satisfactory to the managing underwriters.

                                       4
<PAGE>
 
               (c)  Right to Terminate Registration. If, at any time after
                    -------------------------------       
giving written notice of its intention to register any of its securities as set
forth in Section 3(a) and prior to the effective date of the registration
statement filed in connection with such registration, the Company shall
determine for any reason not to register such securities, the Company may, at
its election, give written notice of such determination to each Holder of
Registrable Securities and thereupon be relieved of its obligation to register
any Registrable Securities in connection with such registration (but not from
its obligation to pay the Registration Expenses in connection therewith as
provided herein).

               (d)  Selection of Underwriters. The Company will have the right
                    -------------------------   
to select the investment banker(s) and manager(s) to administer an offering
pursuant to a Piggyback Registration.

          4.   Expenses of Registration.  Except as otherwise provided herein,
               ------------------------                                       
all Registration Expenses incurred in connection with all registrations pursuant
to Sections 2 and 3 shall be borne by the Company.  All Selling Expenses
relating to securities registered on behalf of the Holders of Registrable
Securities shall be borne by such holders.

          5.   Holdback Agreements.
               ------------------- 

               (a)  The Company agrees (i) not to effect any public sale or
distribution of its equity securities, or any securities convertible into or
exchangeable or exercisable for such securities, during the seven days prior to
and during the 90-day period beginning on the effective date of any underwritten
Demand Registration or any underwritten Piggyback Registration (except as part
of such underwritten registration or pursuant to registrations on Form S-8 or
any successor form), unless the underwriters managing the registered public
offering otherwise agree, and (ii) to use reasonable efforts to cause each
holder of at least 5% (on a fully-diluted basis) of its Common Stock, or any
securities convertible into or exchangeable or exercisable for Common Stock,
purchased from the Company at any time after the date of this Agreement (other
than in a registered public offering) to agree not to effect any public sale or
distribution (including sales pursuant to Rule 144) of any such securities
during such periods (except as part of such underwritten registration, if
otherwise permitted), unless the underwriters managing the registered public
offering otherwise agree.

               (b)  Each Holder agrees, if requested by the managing underwriter
or underwriters in an underwritten offering of securities of the Company, not to
effect any offer, sale, distribution or transfer of Registrable Securities
(other than transfers to an Affiliate of such Holder in accordance with the
provisions of the Securities Purchase Agreement), including a sale pursuant to
Rule 144 (or any similar provision then in effect) under the Securities Act
(except as part of such underwritten registration), during the seven-day period
prior to, and during the 180-day period (or such shorter period as may be agreed
to by the parties hereto) following the effective date of such Registration
Statement to the extent timely notified in writing by the Company or Newco or
the managing underwriter or underwriters.

          6.   Registration Procedures.  Whenever the Holders of Registrable
               -----------------------                                      
Securities have requested that any Registrable Securities be registered pursuant
to this Agreement, the Company  will use its best efforts to effect the
registration and the sale of such Registrable 

                                       5
<PAGE>
 
Securities in accordance with the intended method of distribution thereof, and
pursuant thereto the Company will as expeditiously as possible:

               (a)  subject to Section 2(c) hereof, prepare and file with the
Commission a registration statement on any form for which the Company  qualifies
with respect to such Registrable Securities and use its best efforts to cause
such registration statement to become effective (provided that before filing a
registration statement or prospectus or any amendments or supplements thereto,
the Company  will (i) furnish to the counsel selected by the Holders copies of
all such documents proposed to be filed, which documents will be subject to the
review of such counsel, and (ii) notify each holder of Registrable Securities
covered by such registration of any stop order issued or threatened by the
Commission);

               (b)  subject to Section 2(c) hereof, prepare and file with the
Commission such amendments and supplements to such registration statement and
the prospectus used in connection therewith as may be necessary to keep such
registration statement effective for a period equal to the shorter of (i) six
months and (ii) the time by which all securities covered by such registration
statement have been sold, and comply with the provisions of the Securities Act
with respect to the disposition of all securities covered by such registration
statement during such period in accordance with the intended methods of
disposition by the sellers thereof set forth in such registration statement;

               (c)  furnish to each seller of Registrable Securities such number
of copies of such registration statement, each amendment and supplement thereto,
the prospectus included in such registration statement (including each
preliminary prospectus) and such other documents as such seller may reasonably
request in order to facilitate the disposition of the Registrable Securities
owned by such seller;

               (d)  use its best efforts to register or qualify such Registrable
Securities under such other securities or blue sky laws of such jurisdiction  as
any seller reasonably requests and do any and all other acts and things which
may be reasonably necessary or advisable to enable  such seller to consummate
the disposition in such jurisdictions of the Registrable Securities owned by
such seller (provided that the Company  will not be required to (i) qualify
generally to do business in any jurisdiction where it would not otherwise be
required to qualify but for this Section 6(d), (ii) subject itself to taxation
in any jurisdiction or (iii) consent to general service of process in any such
jurisdiction);

               (e)  notify each seller of such Registrable Securities, at any
time when a prospectus relating thereto is required to be delivered under the
Securities Act, of the happening of any event as a result of which the
prospectus included in such registration statement contains an untrue statement
of a material fact or omits any fact necessary to make the statements therein
not misleading, and, at the request of any such seller, the Company will prepare
a supplement of amendment to such prospectus so that, as thereafter delivered to
the purchasers of such Registrable Securities, such prospectus will not contain
an untrue statement of a material fact or omit to state any fact necessary to
make the statements therein not misleading; provided that the Company shall not
be required to amend the registration statement or supplement the Prospectus for
a period of up to six months if the board of directors determines in good faith
that to do so would reasonably be expected to have a material adverse effect on
any

                                       6
<PAGE>
 
proposal or plan by the Company to engage in any financing, acquisition or
disposition of assets (other than in the ordinary course of business) or any
merger, consolidation, tender offer or similar transaction or would require the
disclosure of any information that the board of directors determines in good
faith the disclosure of which would be detrimental to the Company, it being
understood that the period for which the Company is obligated to keep the
Registration Statement effective shall be extended for a number of days equal to
the number of days the Company delays amendments or supplements pursuant to this
provision. Upon receipt of any notice pursuant to this Section 6(e) Holders
shall suspend all offers and sales of securities of the Company and all use of
any prospectus until advised by the Company that offers and sales may resume,
and shall keep confidential the fact and content of any notice given by the
Company pursuant to this section 6(e).

               (f)  cause all such Registrable Securities to be listed on each
securities exchange or quotation system on which similar securities issued by
the Company are then listed;

               (g)  provide a transfer agent and registrar for all such
Registrable Securities not later than the effective date of such registration
statement;

               (h)  enter into such customary agreements (including underwriting
agreements in customary form) and take all such other actions as the holders of
a majority of the Registrable  Securities being sold or the underwriters, if
any, reasonably request in order to expedite or facilitate the disposition of
such Registrable Securities (including without limitation, effecting a stock
split or a combination of shares);

               (i)  make available for inspection by a representative of the
Holders of Registrable Securities included in the registration statement, any
underwriter participating in any disposition pursuant to such registration
statement and any attorney, accountant or other agent retained by any such
seller or underwriter all pertinent financial and other records, pertinent
corporate documents and properties of the Company, and cause the Company's
officers, directors, employees and independent accountants to supply all
information reasonable requested by any such seller, underwriter, attorney,
accountant or agent in connection with such registration statement;

               (j)  otherwise use its reasonable efforts to comply with all
applicable rules and regulations of the Commission, and make available to its
security holders, as soon as reasonably practicable, an earnings statement
covering the period of at least 12 months beginning with the first day of the
Company's first full calendar quarter after the effective date of the
registration statement, which earnings statement shall satisfy the provisions of
Section 11(a) of the Securities Act and Rule 158 thereunder;

               (k)  in the event of the issuance of any stop order suspending
the effectiveness of a registration statement, or of any order suspending or
preventing the use of any related prospectus or suspending the qualification of
any common stock included in such registration statement for sale in any
jurisdiction, use its reasonable best efforts promptly to obtain the withdrawal
of such order; and

                                       7
<PAGE>
 
               (l)  obtain a so-called "cold comfort" letter from the Company's
independent public accountants in customary form and covering such matters of
the type customarily covered by cold comfort letters.

          7.   Indemnification.
               --------------- 

               (a)  The Company agrees to indemnify, to the fullest extent
permitted by applicable law, each Holder of Registrable Securities, its officers
and directors and each Person who controls such Holder (within the meaning of
the Securities Act) against all losses, claims, damages, liabilities, expenses
or any amounts paid in settlement of any litigation, investigation or proceeding
commenced or threatened (collectively, "Claims") to which each such indemnified
party may become subject under the Securities Act insofar as such Claim arose
out of (i) any untrue or alleged untrue statement of material fact contained, on
the effective date thereof, in any registration statement, prospectus or
preliminary prospectus or any amendment thereof or supplement thereto or (ii)
any omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading,
except insofar as the same are caused by or contained in any information
furnished in writing to the Company by such holder expressly for use therein or
by such holder's failure to deliver a copy of the registration statement or
prospectus or any amendments or supplements thereto after the Company has
furnished such holder with a sufficient number of copies of the same. In
connection with an underwritten offering, the Company will indemnify such
underwriters, their officers and directors and each Person who controls such
underwriters (within the meaning of the Securities Act) to the same extent as
provided above with respect to the indemnification of the holders of Registrable
Securities.

               (b)  In connection with any registration statements in which a
holder of Registrable Securities is participating, each such Holder will furnish
to the Company in writing such customary information and affidavits as the
Company reasonably requests for use in connection with any such registration
statement or prospectus (the "Seller's Information") and, to the fullest extent
permitted by applicable law will indemnify the Company , its directors and
officers and each Person who controls the Company (within the meaning of the
Securities Act) against any and all Claims to which each such indemnified party
may become subject under the Securities Act insofar as such Claim arose out of
(i) any untrue or alleged untrue statement of material fact contained, on the
effective date thereof, in any registration statement, prospectus or preliminary
prospectus or any amendment thereof or supplement thereto, (ii) any omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading or (iii) any
violations by such Person of any federal, state or common law rule or regulation
applicable to such Person and relating to action required of or inaction by such
Person in connection with any such registration; provided that with respect to a
Claim arising pursuant to clause (i) or (ii) above, the material misstatement or
omission is contained in such Seller's Information; provided, further, that the
obligation to indemnify will be individual to each Holder and will be limited to
the net amount of proceeds received by such Holder from the sale of Registrable
Securities pursuant to such registration statement.

               (c)  Any Person entitled to indemnification hereunder will (i)
give prompt written notice to the indemnifying party of any claim with respect
to which it seeks indemnification (but the failure to provide such notice shall
not release the indemnifying party of

                                       8
<PAGE>
 
its obligation under paragraphs (a) and (b), unless and then only to the extent
that, the indemnifying party has been prejudiced by such failure to provide such
notice) and (ii) unless in such indemnified party's reasonable judgment a
conflict of interest between such indemnified and indemnifying parties may exist
with respect to such claim, permit such indemnifying party to assume the defense
of such claim with counsel reasonably satisfactory to the indemnified party. An
indemnifying party who is not entitled to, or elects not to, assume the defense
of a claim will not be obligated to pay the fees and expenses of more than one
counsel for all parties indemnified by such indemnifying party with respect to
such claim, unless in the reasonable judgment of any indemnified party a
conflict of interest may exist between such indemnified party and any other of
such indemnified parties with respect to such claim.

               (d)  The indemnifying party shall not be liable to indemnify an
indemnified party for any settlement, or consent to judgment of any such action
effected without the indemnifying party's consent (but such consent will not be
unreasonably withheld).  Furthermore,  the indemnifying party shall not, except
with the approval of each indemnified party, consent to entry of any judgment or
enter into any settlement which does not include as an unconditional term
thereof the giving by the claimant or plaintiff to each indemnified party of a
release from all liability in respect to such claim or litigation without any
payment or consideration provided by each such indemnified party.

               (e)  If the indemnification provided for in this Section 7 is
unavailable to an indemnified party under clauses (a) and (b) above in respect
of any losses, claims, damages or liabilities referred to therein, then each
indemnifying party, in lieu of indemnifying such indemnified party, shall
contribute to the amount  paid or payable by such indemnified party as a result
of such losses, claims, damages or liabilities in such proportion as is
appropriate to reflect not only the relative benefits received by the Company,
the underwriters, the sellers of Registrable Securities and any other sellers
participating in the registration statement from the sale of shares pursuant to
the registered offering of securities to which indemnity is sought but also the
relative fault of the Company , the underwriters the sellers of Registrable
Securities and any other sellers participating in the registration statement in
connection with the statement or omissions which resulted in such losses,
claims, damages or liabilities, as well as any other relevant equitable
considerations.  The relative benefits received by the Company, the
underwriters, the sellers of Registrable Securities and any other sellers
participating in the registration statement shall be deemed to be based on the
relative relationship of the total net proceeds from the offering (before
deducting expenses) to the Company, the total underwriting  commissions and fees
from the offering (before deducting expenses) to the underwriters and the total
net proceeds from the offering (before deducting expenses) to the sellers of
Registrable Securities and any other sellers participating in the registration
statement.  The relative fault of the Company, the underwriters, the sellers of
Registrable Securities and any other sellers participating in the registration
statement shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
or by registration statement and the parties' relative intent, knowledge, access
to information and opportunity to correct or prevent such statement or omission.

               (f)  The indemnification provided for under this Agreement will
remain in full force and effect regardless of any investigation made by or on
behalf of the

                                       9
<PAGE>
 
indemnified party or any officer, director or controlling person of such
indemnified party and will survive the transfer of securities.

          8.   Participation in Underwritten Registrations.  No Person may
               -------------------------------------------                
participate in any registration hereunder which is underwritten unless such
Person (a) agrees to sell such Person's securities on the basis provided in any
underwriting arrangements approved by the Person or Persons entitled hereunder
to approve such arrangements, (b) as expeditiously as possible notifies the
Company  of the occurrence of any event as a result of which such prospectus
contains an untrue statement of material fact or omits to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading and (c) completes and executes all questionnaires, powers of
attorney, indemnities, underwriting agreements and other documents reasonably
required under the terms  of such underwriting arrangements.

          9.   Transfer of Registration Rights. The rights granted to any Person
               -------------------------------  
under this Agreement may be assigned to a transferee or assignee who is an
Affiliate of such Person in connection with any transfer or assignment of
Registrable Securities by a Holder; provided, that: (a) such transfer may
otherwise be effected in accordance with applicable securities laws, (b) if not
already a party hereto, the assignee or transferee agrees in writing prior to
such transfer to be bound by the provisions of this Agreement applicable to the
transferor, (c) such transferee shall own Registrable Securities representing at
least 1,000,000 shares of Common Stock (subject to the Anti-dilution
Adjustments), and (d) EIS shall act as agent and representative for such Holder
for the giving and receiving of notices hereunder.

          10.  Information by Holder.  Each Holder shall furnish the Company
               ---------------------                                        
such written information regarding such Holder and any distribution proposed by
such Holder as the Company  may reasonably request in writing and as shall be
reasonably required in connection with any registration qualification or
compliance referred to in this Agreement.

          11.  Exchange Act Compliance.  The Company shall comply with all of
               -----------------------                                       
the reporting requirements of the Exchange Act applicable to them and shall
comply with all other public information reporting requirements of the
Commission which are conditions to the availability of Rule 144 for the sale of
the Registrable Securities.  The Company shall cooperate with each Purchaser in
supplying such information as may be necessary for such Purchaser to complete
and file any information reporting forms presently or hereafter required by the
Commission as a condition to the availability of Rule 144.

          12.  Limitation on Registration.  The Company shall not be obligated
               --------------------------                                     
to effect a registration of any Holder's Registrable Securities pursuant to
Sections 2 or 3 hereof if all of the Registrable Securities have been sold under
Rule 144, Regulation S or similar provision under the Securities Act so that
there is no further restriction on the transfer by the transferee. The Company
shall not be required to include any Registrable Securities of a Holder in a
registration if all of such Holder's Registrable Securities could be sold within
a three month period pursuant to Rule 144 or other similar rule or regulation.

                                       10
<PAGE>
 
          13.  Miscellaneous.
               ------------- 

               (a)  No Inconsistent Agreements. The Company will not hereafter
                    --------------------------       
enter into any agreement with respect to their securities which is inconsistent
with or violates the rights granted to the Holders of Registrable Securities in
this Agreement without the prior written consent of a majority in interest of
such Registrable Securities.

               (b)  Remedies. Any Person having rights under any provision of
                    --------   
this Agreement will be entitled to enforce such rights specifically to recover
damages caused by reason of any breach of any provision of this Agreement and to
exercise all other rights granted by law. The parties hereto agree and
acknowledge that money damages may not be an adequate remedy for any breach of
the provisions of this Agreement and that any party may in its sole discretion
apply to any court of law or equity of competent jurisdiction (without posting
any bond or other security) for specific performance and for other injunctive
relief in order to enforce or prevent violation of the provisions of this
Agreement; provided that in no event shall any Holder have the right to enjoin
or interfere with any offering of securities by the Company.

               (c)  Amendments and Waivers. Except as otherwise provided herein,
                    ----------------------   
the provisions of this Agreement may be amended or waived only upon the prior
written consent of the Company and Holders of at least 50% of the Registrable
Securities; provided, that without the prior written consent of all the Holders,
no such amendment or waiver shall reduce the foregoing percentage.

               (d)  Successors and Assigns. All covenants and agreements in this
                    ----------------------   
Agreement by or on behalf of any of the parties hereto will bind and inure to
the benefit of the respective successors and assigns of the parties hereto
whether so expressed or not. In addition, whether or not any express assignment
has been made, the provisions of this Agreement which are for the benefit of
Holders of Registrable Securities are also for the benefit of, and enforceable
by, any permitted transferee of Registrable Securities.

               (e)  Severability. Whenever possible, each provision of this
                    ------------            
Agreement will be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be prohibited
by or invalid under applicable law, such provision will be ineffective only to
the extent of such prohibition or invalidity, without invalidating the remainder
of this Agreement.

               (f)  Counterparts. This Agreement may be executed simultaneously
                    ------------   
in two or more counterparts, any one of which need not contain the signatures of
more than one party, but all such counterparts taken together will constitute
one and the same Agreement.

               (g)  Descriptive Headings. The descriptive headings of this
                    --------------------   
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

               (h)  Governing Law. This Agreement shall be governed by and
                    -------------  
construed in accordance with the laws of the State of New York, without giving
effect to the principles thereof relating to conflicts of laws.

                                       11
<PAGE>
 
               (i)  Notices. All notices, demands and requests of any kind to be
                    -------   
delivered to any party in connection with this Agreement shall be in writing and
shall be deemed to have been duly given if personally delivered or if sent by
nationally-recognized overnight courier or by registered or certified airmail,
return receipt requested and postage prepaid, addressed as follows:

                    (i)  if to the Company, to:

                         Endorex Corp.
                         900 Lake Shore Drive
                         Lake Bluff, Illinois 60044
                         Attn: President

                         with a copy to:

                         Brobeck, Phleger & Harrison LLP
                         1633 Broadway, 47th Floor
                         New York, New York 10019
                         Attention: Nigel L. Howard, Esq.

                    (ii) if to EIS, to:

                         Elan International Services, Ltd.
                         102 St. James Court
                         Flatts, Smiths Parish
                         Bermuda FL04
                         Attention: Director

                         with a copy to:

                         Brock Silverstein McAuliffe LLC
                         153 East 53rd Street, 56th Floor
                         New York, New York 10022
                         Attention: David Robbins, Esq.

or to such other address as the party to whom notice is to be given may have
furnished to the other party hereto in writing in accordance with provisions of
this Section 7.  Any such notice or communication shall be deemed to have been
received (i) in the case of personal delivery, on the date of such delivery,
(ii) in the case nationally-recognized overnight courier, on the second business
day after the date when sent and (iii) in the case of mailing, on the fifth
business day following that day on which the piece of mail containing such
communication is posted. Notice hereunder may be given on behalf of the parties
by their respective attorneys.

               (j)  Termination. This Agreement shall terminate on the date as
                    -----------        
of which each Holder has sold all remaining Registrable Securities in a
transaction or transactions of the type described in Section 12 hereof.

                           [Signature page follows]

                                       12
<PAGE>
 
          IN WITNESS WHEREOF, the parties have executed this Registration Rights
Agreement as of the date first  written above.

                                   Endorex Corp.



                                   By: /s/ David G. Franckowiak
                                      ----------------------------------------
                                        Name:   David G. Franckowiak
                                        Title:  Vice President, Finance and
                                                Administration

                                   Elan International Services, Ltd.



                                   By: /s/ Kevin Insley
                                      ----------------------------------------
                                        Name:   Kevin Insley
                                        Title:  President and Chief Financial 
                                                Officer

                                       13

<PAGE>
 
                                                                   EXHIBIT 10.23
                                      CONFIDENTIAL TREATMENT HAS BEEN SOUGHT FOR
                                 PORTIONS OF THIS EXHIBIT PURSUANT TO RULE 24B-2
                           UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

THIS AGREEMENT is made the 21 October, 1998


BY AND BETWEEN


ELAN CORPORATION, PLC

An Irish company, of Lincoln House, Lincoln Place, Dublin 2, Ireland


ENDOREX CORPORATION

A Delaware corporation of Lake Bluff, Illinois, USA


ENDOREX NEWCO, LTD.

A Bermudan corporation, of Clarendon House, 2 Church St, Hamilton, Bermuda


AND


ELAN MEDICAL TECHNOLOGIES LIMITED

An Irish company, of Monksland, Athlone, Co. Westmeath, Ireland


                               LICENSE AGREEMENT
                                        
<PAGE>
 
                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
   CLAUSE NO.      CLAUSE
- ---------------------------------------------------------------------
  <S>              <C> 
   1                Definitions
- ---------------------------------------------------------------------
   2                Grant of Rights
- ---------------------------------------------------------------------
   3                Third Party Technology/Substitute Compound
- ---------------------------------------------------------------------
   4                Improvements   
- ---------------------------------------------------------------------
   5                Intellectual Property Rights 
- ---------------------------------------------------------------------
   6                Exploitation of Licensed Technology  
- ---------------------------------------------------------------------
   7                Financial Provisions  
- ---------------------------------------------------------------------
   8                Right of Audit and Inspection  
- ---------------------------------------------------------------------
   9                Patents  
- ---------------------------------------------------------------------
   10               Confidential Information 
- ---------------------------------------------------------------------
   11               Trademarks 
- ---------------------------------------------------------------------
   12               Term and Termination 
- ---------------------------------------------------------------------
   13               Warranties/Indemnities  
- ---------------------------------------------------------------------
   14               Insurance    
- ---------------------------------------------------------------------
   15               Impossibility of Performance - Force Majeure 
- ---------------------------------------------------------------------
   16               Settlement of Disputes; Proper Law 
- ---------------------------------------------------------------------
   17               Assignment  
- ---------------------------------------------------------------------
   18               Notices      
- ---------------------------------------------------------------------
   19               Miscellaneous Clauses 
- ---------------------------------------------------------------------
</TABLE>

                                       i
<PAGE>
 
WHEREAS
- -------

A.   Elan is knowledgeable in the discovery, research, development, manufacture
     and marketing of pharmaceutical formulations and devices capable of
     delivering drugs, including the Medipad System. Elan owns or has licensed
     the Elan Technology either itself or through EMT (defined below). Elan also
     owns and uses certain trademarks in connection with the manufacture,
     marketing and sale of the Medipad System, including the Elan Trademarks.
     Elan Medical Technologies Ltd. is a wholly owned Subsidiary of Elan.

B.   Endorex has proprietary know-how and expertise relating to, inter alia, the
     research, development and commercialization of pharmaceutical formulations
     capable of delivering drugs.

C.   Elan and Endorex have agreed to co-operate in the establishment and
     management of the Company, the business of which will be to research and
     develop certain Elan Royalty Products incorporating the technologies
     developed and/or to be developed by Elan and to commercialize such Elan
     Royalty Products throughout the world.

D.   Simultaneously herewith, Elan and Endorex are entering into the Development
     Agreement for the purpose of recording the terms and conditions of the
     joint venture and to regulate their relationship with each other and
     certain aspects of the affairs of and their dealings with the Company.

E.   The Company desires to enter into this Agreement with Elan so as to (a)
     permit the Company to utilize the Elan Patents, the Elan Know-How and the
     Elan Trademark in the research, development, manufacture, distribution and
     sale of the Elan Royalty Products in the Field and (b) to permit Elan to
     utilise the Company Technology in connection with (i) Elan's research and
     development work on behalf of the Company and (ii) Elan's manufacturing and
     supplying the Company or its designee(s) with the Elan Royalty Products.

NOW IT IS HEREBY AGREED AS FOLLOWS:

1.   DEFINITIONS

     1.1.  In this present Agreement, including the Recitals, Schedules and
           Appendices, the following definitions shall prevail unless the
           context otherwise requires:

     "AFFILIATE"         means any corporation or entity other than the Company
                         controlling, controlled or under the common control of
                         Elan or the Company as the case may be. For the purpose
                         of this definition "control" shall mean direct or
                         indirect ownership of fifty percent (50%) or more of
                         the stock or shares entitled to vote for the election
                         of directors.

     "AGREEMENT"         means this agreement (which expression shall be deemed
                         to include the Recitals, the Schedules and Appendices
                         hereto).
<PAGE>
 
     "COMPETITION"       means on [****] The determination that Competition
                         exists in any country in any calendar quarter shall be
                         deemed conclusive if a mutually agreed reputable
                         organization such as IMS has made such determination
                         based on its conduct of a market share study in such
                         country during such calendar quarter, provided the
                         existence of such level of sales of competing products
                         may also be established by other reasonable evidence.
                         Once a determination is made that Competition exists
                         for the Elan Royalty Product in any country, such
                         determination shall be made again by the Parties each
                         calendar quarter for so long as the Elan Royalty
                         Product is marketed in that country.

     "COMPANY"           means Endorex Newco, Ltd.

     "COMPANY            means (i) the [****] compounds made, invented, 
     COMPOUND(S)"        acquired, developed or licensed by the Company and,
                         (ii) if applicable, any Substitute Compound.

     "COMPANY            means all Know-How, knowledge, information, trade 
     KNOW-HOW"           secrets, data (including all clinical data) and
                         expertise which is not generally known to the public,
                         developed, acquired or licensed by the Company or to be
                         developed, acquired or licensed by the Company before
                         or during the Term relating to the Company Compounds
                         (but excluding any such knowledge, information, trade
                         secrets, data and expertise insofar as the same relates
                         to the Medipad System), whether or not covered by any
                         patent, copyright, design, trademark or other
                         industrial or intellectual property rights.

     "COMPANY PATENTS"   means all granted patents and patent applications owned
                         by, or licensed by the Company relating to the Company
                         Compounds (but excluding any granted patents and patent
                         applications relating to the Medipad System). Company
                         Patents shall also include all continuations,
                         continuations-in-part, divisionals, re-issues and re-
                         examinations of such patents and patent applications
                         and any patents issuing thereon and extensions of any
                         patents licensed hereunder and all foreign counterparts
                         thereto. Company Patent Rights shall further include
                         any patents or patent applications covering any
                         improvements to the Company Compounds or manufacture or
                         use thereof by the Company during the term of this
                         Agreement.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       2
<PAGE>
 
     "COMPANY            means the Company Patents, the Company Know-How and/or
     TECHNOLOGY"         the Intellectual Property Rights in the Third Party
                         Technology, the Substitute Compound and the Substitute
                         Product which are made, invented, acquired, developed
                         or licensed by the Company, but for the avoidance of
                         doubt excluding any technology relating to the Medipad
                         System.

     "COMPANY            means the Subscription and Stockholders' Agreement of
     SUBSCRIPTION        Endorex Newco, Ltd., made by and between EIS, Endorex
     AGREEMENT"          and the Company as of the date hereof.

     "DEVELOPMENT        means the Joint Development and Operating Agreement 
     AGREEMENT"          of even date entered into between, Elan, EIS, Endorex
                         and the Company.

     "EFFECTIVE DATE"    means the date hereof.

     "EIS"               means Elan International Services, Ltd.

     "ELAN"              means Elan Corporation, plc (Elan is acting through its
                         division Elan Pharmaceutical Technologies).

     "ELAN KNOW-HOW"     means all Know-How, knowledge, information, designs and
                         expertise owned, developed or otherwise possessed by
                         Elan or to be owned, developed, or otherwise possessed
                         by Elan and/or EMT during the Term relating
                         specifically to the Medipad System, whether in
                         conjunction with a pharmaceutical compound(s) or
                         otherwise (but excluding any such knowledge,
                         information and expertise insofar as the same relates
                         specifically to the Company Compounds), whether or not
                         covered by any patent, copyright, design right,
                         trademark, trade secrets or other industrial or
                         Intellectual Property Rights. Elan Know-How shall
                         exclude the Acquired Technology defined in Clause 4.3.

     "ELAN PATENTS"      means all granted patents and pending patent
                         applications owned by, or licensed or developed by Elan
                         and/or EMT relating to the Medipad System, the current
                         status of which is set forth in Schedule 1 and any
                         other Intellectual Property Rights owned by, licensed
                         or developed by Elan and/or EMT relating to the Medipad
                         System. Elan Patent shall also include all
                         continuations, continuations-in-part, divisionals, re-
                         issues and re-examinations of such patents and patent
                         applications and any patents issuing thereon and
                         extensions of any patents licensed hereunder and all
                         foreign counterparts thereto. Elan Patents shall
                         further include any design rights, patents or patent

                                       3
<PAGE>
 
                         applications and any other Intellectual Property Rights
                         owned by, licensed or developed by Elan and/or EMT
                         relating to the Medipad System covering any
                         improvements to the Medipad System or methods of making
                         or using the Medipad System, made, invented or
                         developed by Elan and/or EMT during the term of this
                         Agreement. Elan Patents shall exclude the Acquired
                         Technology defined in Clause 4.3.

     "ELAN ROYALTY       means a Medipad(TM) System based on, using and/or
     PRODUCT"            incorporating the Elan Technology and containing a
                         Company Compound, and, if applicable, any Substitute
                         Product.

     "ELAN TECHNOLOGY"   means the Elan Patents and/or the Elan Know-How.

                         For the avoidance of doubt, (i)Elan Technology shall
                         include any patents and/or any know-how owned, licensed
                         or controlled by EMT, NanoSystems and Sano Corporation
                         relating specifically to the Medipad System but shall
                         exclude any patents and/or any know-how [****] or
                         [****] including, but not limited to, [****] and (ii)
                         Elan Technology shall exclude the Acquired Technology
                         defined in Clause 4.3.

     "ELAN TRADEMARKS"   means the trademark "Medipad(TM)" and the trademark
                         "Elan(R)", the current status of which are set forth in
                         Schedule 2.

     "EMT"               means Elan Medical Technologies Ltd.

     "ENDOREX"           means Endorex Corporation.

     "EXPERT"            shall have the meaning assigned to such term in Clause
                         15 of the Development Agreement.

     "EXCHANGE RIGHT"    has the meaning as defined in the Development
                         Agreement.

     "FIELD"             means the research, development, and commercialization
                         of
                         
                              (i)   [****] or

                              (ii)  the Substitute Compounds.

     "INDEPENDENT        means any person other than the Company, Elan, Endorex
     THIRD PARTY"        or any of their respective Affiliates.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       4
<PAGE>
 
     "INITIAL FUNDING"   has the meaning as such term is defined in the Company
                         Subscription Agreement.

     "IN-MARKET"         means [****] (or where applicable by [****] to an
                         [****] such as a [****] and shall exclude [****].

     "INTELLECTUAL       shall mean Patents, copyrights, design rights, 
     PROPERTY RIGHTS"    trademarks, trade secrets, database rights, know-how
                         and any other applicable intellectual property rights.

     "KNOW-HOW"          means all trade secrets, confidential scientific,
                         technical and medical information and expertise,
                         technical data and marketing information, studies and
                         data including, but not limited to, unpatented
                         inventions, discoveries, designs, theories, plans,
                         ideas (whether or not reduced to practice).

     "MANAGEMENT         means the management committee appointed by the 
     COMMITTEE"          directors of the Company pursuant to the Development
                         Agreement.

     "MEDIPAD SYSTEM"    means Elan's ambulatory, subcutaneous, micro-infusion
                         pump device and related technology.

     "NANO" OR           means NanoSystems L.L.C.
     "NANOSYSTEMS"          

     "NET SALES"         means [****].

     "PANEL"             shall have the meaning assigned to such term in Clause
                         15 of the Development Agreement.
     
     "PARTIES"           means Elan, Endorex and the Company.

     "PATENTS"           means all and any patents, and any applications
                         therefor in the Territory (including any and all
                         divisions, continuations, continuations-in-part,
                         extensions, additions or reissues thereto or thereof).

     "PERSON"            means an individual, partnership, corporation, limited
                         liability company, business trust, joint stock company,
                         trust, unincorporated association, joint venture, or
                         other entity of whatever nature.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       5
<PAGE>
 
     "PLAN"              shall have the meaning as such term is defined in the
                         Development Agreement.

     "PROJECT"           means all activity as undertaken by Elan, Endorex,
                         and/or the Company in order to develop the Elan Royalty
                         Products in accordance with the Plan.

     "RELEVANT EVENT"    has the meaning set forth in Clause 12.

     "REGULATORY         means any regulatory application or any other 
     APPLICATION"        application for marketing approval for an Elan Royalty
                         Product, but not the Medipad System alone, which the
                         Company will file in any country of the Territory,
                         including any supplements or amendments thereto.

     "REGULATORY         means the final approval to market an Elan Royalty 
     APPROVAL"           Product, but not the Medipad System alone, in any
                         country of the Territory, including pricing and
                         reimbursement approval and any other approval which is
                         required to launch the Elan Royalty Product in the
                         normal course of business.

     "RESEARCH AND       means the program of research and development work 
     DEVELOPMENT         being conducted or to be conducted for and on behalf 
     PROGRAM             of the Company which have been devised by the R&D
                         Committee and approved by the Management Committee;

     "R&D COMMITTEE"     shall have the meaning as such term is defined in the
                         Development Agreement.

     "RHA"               means any relevant government health authority (or
                         successor agency thereof) in any country of the
                         Territory whose approval is necessary to market an Elan
                         Royalty Product in the relevant country of the
                         Territory.

     "SANO" OR "SANO     means Elan Transdermal Technologies, Inc, formerly Sano
     CORPORATION"        Corporation.

     "SUBSIDIARY"        of any Person means any other Person, (i) of which (or
                         in which) greater than 50% of (A) the outstanding
                         capital stock having ordinary voting power to elect a
                         majority of the board of directors of such second
                         Person, if a corporation, (B) the interest in the
                         capital or profits of such second Person, if a
                         partnership or other entity, or (C) the beneficial
                         interest of such trust or estate, if a trust or estate,
                         is at the time directly or indirectly owned by such
                         first Person, by such first Person and one or more
                         other Subsidiaries of such first Person, or by one or
                         more other Subsidiaries of such first Person; (ii)
                         which is otherwise effectively controlled by such first
                         Person or any

                                       6
<PAGE>
 
                         other Subsidiary of such first Person, pursuant to
                         contract, arrangement, understanding or otherwise; or
                         (iii) or any other corporation, association or other
                         business entity that is required by GAAP to be combined
                         or consolidated with such Person.

     "SUBSISTING"        means valid, enforceable and unexpired.

     "SUBSTITUTE         means the substitute compound described in Clause 3.
     COMPOUND"            

     "SUBSTITUTE         means a Medipad System based on, using and/or 
     PRODUCT"            incorporating the Elan Technology and/or the Company
                         Technology and containing a Substitute Compound,
                         including but not limited to patents and know-how that
                         may be acquired by or on behalf of the Company.

     "TECHNOLOGIES"      means collectively, the Company Technology and the Elan
                         Technology.

     "TERM"              shall mean the term of this Agreement, as set out in
                         Clause 12.

     "TERRITORY"         means [****].

     "THIRD PARTY        means the technology of Independent Third Parties 
     TECHNOLOGY"         described in Clause 3.

     "TECHNOLOGICAL      means a Type I Technological Competitor or a Type II
     COMPETITOR"         Technological Competitor.

     "TYPE I             means [****].
     TECHNOLOGICAL            
      COMPETITOR"

     "TYPE II            shall mean [****].
     TECHNOLOGICAL           
     COMPETITOR"

     "UNITED STATES      means the lawful currency for the time being of the 
     DOLLAR", "US$"      United States of America.
      AND "$"                         

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       7
<PAGE>
 
     1.2.  Words importing the singular shall include the plural and vice versa.

     1.3.  Unless the context otherwise requires, reference to a recital,
           article, paragraph, provision, clause or schedule is to a recital,
           article, paragraph, provision, clause or schedule of or to this
           Agreement.

     1.4.  Reference to a statute or statutory provision includes a reference to
           it as from time to time amended, extended or re-enacted.

     1.5.  The headings in this Agreement are inserted for convenience only and
           do not affect its construction.

     1.6.  Unless the context or subject otherwise requires, references to words
           in one gender include references to the other genders.

     1.7.  References to "include" or "including" shall be construed as examples
           only, and in no way be read as limiting.

2.   GRANT OF RIGHTS

     2.1.  Subject to the terms of this Agreement, under all of the existing and
           future Elan Patents and Elan Technology, Elan and EMT hereby grant to
           the Company for the Term an exclusive licence to the Elan Technology
           for all research, development, and commercial purposes solely in the
           Field, but not beyond the Field.

           All proprietary rights and rights of ownership with respect to the
           Elan Technology shall at all times remain solely with Elan or EMT, or
           where applicable with Elan's licensor.

     2.2.  Subject to any restriction in any licenses or other agreements
           pursuant to which Elan licenses any of the Elan Trademarks, Elan
           hereby grants the Company for the Term a non-exclusive, royalty-free,
           fully paid-up license (or, if applicable, sublicense) to use the Elan
           Trademarks on the terms set forth in Clause 11 upon or in relation to
           the promotion, marketing, advertising, sale or offering for sale of
           the Elan Royalty Products.

           The Company shall be obliged to use the Elan Trademarks to
           acknowledge the incorporation of the Medipad System in the Elan
           Royalty Products in a manner to be mutually agreed by the parties.

     2.3.  Subject to the terms of this Agreement, the Company hereby grants to
           Elan for the Term a non-exclusive, royalty-free fully paid-up license
           to use the Company Technology and the Third Party Technology insofar
           as is necessary, in each case, solely to permit Elan to perform its
           obligations pursuant to the Development Agreement for the benefit of
           the Company, including, without limitation, (a) conducting research
           and development pursuant to the Project, and (b) developing,
           manufacturing and supplying the Elan Royalty Products and any other
           chemical or formulation components. All rights of ownership with
           respect to the Company Technology shall at all times remain solely
           with the Company.

                                       8
<PAGE>
 
     2.4.  The Company shall not be permitted to sublicense any of the rights
           granted to the Company by Elan pursuant to this Agreement without the
           prior written consent of Elan, which consent will not be unreasonably
           withheld or delayed; provided that such reasonableness standard in
           the case of Elan shall not be applicable in the case of a proposed
           sublicense to any Technological Competitor and the terms of any sub-
           licence to which Elan consents hereunder will require the prior
           approval in writing of Elan. Insofar as the obligations owed by the
           Company to Elan are concerned, the Company shall remain responsible
           for all acts and omissions of any sub-licensee, as if they were by
           the Company. In the event of a termination of this Agreement due to a
           breach by the Company, Elan shall have the right but not the
           obligation to assume any such sub-license.

     2.5.  Subject to the other provisions of this Agreement, [****] (a) for or
           on behalf of the Company, or (b) with the Company's prior written
           consent.

           For the avoidance of doubt the parties confirm that [****].

     2.6.  Notwithstanding anything to the contrary in this Agreement, Elan
           shall have the right, outside of the Field, and subject to Clause
           2.5, to fully exploit and grant licenses and sublicenses with respect
           to the Elan Technology and improvements to the Elan Technology that
           may be developed by Elan, Endorex or the Company or jointly by any
           combination of Elan, Endorex or the Company pursuant to the Project.

     2.7.  Elan shall also provide all reasonable assistance to the Company in
           delivering and enabling the Company to utilize the Company's license
           to the Elan Technology.

     2.8.  EMT acknowledges and agrees to be bound by the terms of this
           Agreement, including but not limited to the licenses granted
           hereunder and the provisions of Clause 2.5.

3.   THIRD PARTY TECHNOLOGY/SUBSTITUTE COMPOUND

     3.1.  The Company will use its reasonable endeavours to acquire within 90
           days of the Effective Date (by outright acquisition or license)
           rights related to a third party's [****] technology and any
           intellectual property related thereto (collectively, the "THIRD PARTY
           TECHNOLOGY"), upon terms and conditions approved by Elan, utilizing a
           mutually agreed portion of the proceeds of the Initial Funding.

     3.2.  In the event that notwithstanding its reasonable endeavours, the
           [****]  the Company shall have [****] ("THE SUBSTITUTE COMPOUND").

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       9
<PAGE>
 
           In the event that the Company exercises the foregoing option, the
           Parties shall negotiate in good faith such amendments as are required
           to this Agreement, such as amending the provisions regulating non-
           competition.

4.   IMPROVEMENTS/ACQUIRED TECHNOLOGY

     4.1.  Except to the extent prohibited by any undertaking given to any
           Independent Third Party (provided that after the Effective Date each
           Party shall use all commercially reasonably efforts to exclude or
           minimise the extent of any such limitations or restrictions), the
           licenses to the Elan Technology granted by Elan and EMT pursuant to
           Clause 2 shall include any and all future improvements or
           modifications made, invented or developed by Elan or EMT relating to
           the Elan Technology and all Patents and other Intellectual Property
           Rights relating thereto provided that this Clause 4.1 shall not
           include any Acquired Technology as defined in Clause 4.3.

     4.2.  If Elan and/or EMT develops any improvements during the Term, Elan
           and/or EMT shall communicate to the Company such improvements and
           shall promptly inform the Company of such improvements so as to
           effectively enable the Company to fully utilise the improvements for
           the life of this Agreement. Such improvements shall automatically
           become part of the Elan Know-How or Elan Patents (as the case may be)
           and shall be subject to the provisions of this Agreement including
           the license provisions set forth in Clause 2.1 hereof. The Company
           shall not have any right to use such improvements outside the Field.

     4.3.  Subject to pre-existing contractual constraints, in the event that
           [****] proposes to [****] after the Effective Date [****] after the
           Effective Date pursuant to an agreement existing prior to the
           Effective Date [****] shall, for so long as it remains a stockholder
           of the Company, or may at its election, if it is no longer a
           stockholder of the Company, [****] such details as are required to
           [****] Subject to pre-existing contractual constraints, [****] shall
           have an [****] (the "FIRST RIGHT OF NEGOTIATION"). [****] shall on
           disclosing the details referred to above promptly and [****] in good
           faith with [****] as regards the application of the [****] for a
           period of [****] unless [****] gives [****] in question. The terms
           for the [****] shall be upon [****] to be mutually agreed in good
           faith, including terms covering the [****] in respect of such [****].

     4.4.  In the event that the Company elects not to [****] (or subsequently
           discontinues the [****] shall thereafter be entitled to seek to enter
           into an agreement with the [****] the said [****] within the [****].

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       10
<PAGE>
 
5.   INTELLECTUAL PROPERTY RIGHTS

     5.1.  All Intellectual Property Rights relating to the Elan Technology
           shall be the property of, and held by Elan.

           Title to all [****], whether [****] pursuant to the Project or
           otherwise, or [****] a [****] pursuant to the Project shall be owned
           by [****].

     5.2.  All Intellectual Property Rights relating to the Company Technology
           shall be the property of, and held by, the Company.

           Title to all [****] whether [****] pursuant to the Project or
           otherwise, or [****] or a [****] pursuant to the Project but
           specifically [****] shall be owned [****].

6.   EXPLOITATION OF LICENSED TECHNOLOGY

     6.1.  Except as provided for in this Agreement, the Company's obligations
           to exploit the Elan Technology shall be regulated by Clause 9 of the
           Development Agreement. The Parties recognize that the Company's
           obligations to commercialize the Elan Technology are subject to Elan
           first obtaining regulatory approval in the United States for the
           Medipad System.

     6.2.  The Company will diligently pursue the [****] as provided in the
           Plan.

           The Company shall exert its reasonable efforts to commercialise the
           Elan Royalty Product in each country of the Territory consistent with
           the market potential for the Elan Royalty Product in each country of
           the Territory determined in a commercially reasonable manner and with
           a view to achieving maximum benefit to the Parties.

     6.3.  The Company will be solely responsible for ensuring that the
           manufacture, promotion, distribution, marketing and sale of the Elan
           Royalty Products within each country of the Territory is in strict
           accordance with all the legal and regulatory requirements of each
           country of the Territory.



_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       11
<PAGE>
 
     6.4.  All advertising, promotional materials and marketing costs needed to
           exploit the Elan Royalty Products are to be paid for by the Company.
           Any packaging for the Elan Royalty Products shall contain information
           to the effect that the Elan Royalty Product has been developed by
           Elan in conjunction the Company and is to be agreed upon by Elan in
           advance. Such acknowledgement shall take into consideration
           regulatory requirements and the Company's reasonable commercial
           requirements. The Company shall submit copies of all forms of trade
           package cartons and labels and other printed materials to Elan for
           approval before commercial sale of the Elan Royalty Product
           commences. If a change in such materials from that initially approved
           which would require regulatory approval or filing or any other
           material change is proposed, all such package cartons and labels and
           printed materials shall be resubmitted for approval before commercial
           use thereof. It shall be presumed that Elan approved of such use
           unless Elan provides written notice of disapproval of such use to the
           Company within ten (10) business days of delivery of such materials
           to Elan, such approval not to be unreasonably withheld. The further
           consent of Elan shall not be required where the format and content of
           such materials is substantively similar as the materials previously
           furnished to and approved by Elan.

7.   FINANCIAL PROVISIONS

     7.1.  In consideration of the rights and licences in respect of the Elan
           Patents granted to the Company pursuant to this Agreement, the
           Company shall pay the following amounts to Elan in the manner and on
           the dates set forth below:

          7.1.1.  $10,000,000 upon execution of the Agreement by the Parties,
                  the receipt and adequacy of which is hereby acknowledged;

          7.1.2.  [****]

          7.1.3.  [****]

          provided that in the case of the payments described in Clauses 7.1.2
          -------------                                                       
          and 7.1.3:

          (1)     in the event that the Company has not entered into a licence
                  agreement with a third party in respect of an Elan Royalty
                  Product on the date the payment becomes payable hereunder,
                  Elan shall permit the Company to defer actual payment until a
                  licence agreement has been executed by the Company and a third
                  party in respect of an Elan Royalty Product and the payment
                  shall be paid by the Company to Elan within 30 days of receipt
                  by the Company of income from the third party under such
                  licence agreement;

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       12
<PAGE>
 
           (2)  in the event that the Company has entered into a licence
                agreement with a third party in respect of an Elan Royalty
                Product on the date the payment becomes payable hereunder, but
                the income received by the Company from the third party under
                the licence agreement on that date is not sufficient to
                discharge in full the payment due to Elan, the Company shall
                apply the full amount of all income received from the third
                party under the licence agreement in partial discharge of the
                payment due to Elan and the Company shall pay to Elan the
                balance of the payment from any further sums received by the
                Company from one or more third parties, whatever the nature of
                the sum received.

     7.2.  In consideration of the rights and licences in respect of the Elan
           Patents granted to the Company pursuant to this Agreement, the
           royalty payable by the Company to Elan shall be as follows:

           7.2.1.  [****]

           7.2.2.  [****]

           provided that
           -------------

           (1)  the Company shall be obliged to pay royalties to Elan in respect
                of Net Sales in each country of the Territory at the applicable
                royalty rate set out above notwithstanding that there is no
                Subsisting patent claim covering the Elan Royalty Product in any
                such country where there is no Competition in the country
                concerned;

           (2)  in the event that there is no Subsisting patent claim covering
                the Elan Royalty Product in any country of the Territory and
                there is Competition in the country concerned, the royalty
                payable by the Company to Elan in the circumstances set out in
                Clause 7.2.1 shall be reduced to [****] of Net Sales, or the
                royalty payable by the Company to Elan in the circumstances set
                out Clause 7.2.2, as applicable, shall be reduced to [****] of
                Net Sales.

     7.3.   Elan shall supply, or procure the supply of, Elan Royalty Products
            to the Company at [****] In advance of the first launch of an Elan
            Royalty Product, the Parties shall negotiate in good faith a supply
            agreement on pharmaceutical industry standard terms, including
            provisions as to product quality and supply.



_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       13
<PAGE>
 
     7.4.  In the event that Elan shall cease to be a shareholder of the
           Company, the Parties shall negotiate in good faith such amendments to
           the Agreement as are equitable and applicable having regard to the
           fact that Elan no longer has any representation on the Board of
           Directors of the Company or the Management Committee and will no
           longer be providing support or funding to the Company provided that
           such negotiations shall not apply to the existence of the Agreement.

     7.5.  Payment of royalties shall be made quarterly within forty-five (45)
           days after the expiry of the calendar quarter. The method of payment
           shall be by way of wire transfer to an account specified by Elan.
           Each payment made to Elan shall be accompanied by a written report,
           prepared and signed by a senior financial officer of the Company. In
           addition the report shall clearly show the Net Sales for the months
           of the calendar quarter for which payment is being made on a country
           by country basis. In the event that no royalty is due to Elan for any
           calendar quarter, the senior financial officer shall so report. In
           addition to the written reports accompanying each payment, the
           Company shall notify Elan, within thirty (30) days of the end of each
           calendar quarter, of the Net Sales of the Elan Royalty Product(s) for
           that preceding quarter on a country by country basis.

     7.6.  The Company shall maintain and keep clear, detailed, complete,
           accurate and separate records so:

           7.6.1.  as to enable any royalties on Net Sales of a Elan Royalty
                   Product which shall have accrued hereunder to be determined;
                   and

           7.6.2.  that any deductions made in arriving at the Net Sales of a
                   Elan Royalty Product can be determined.

     7.7.  All payments due hereunder shall be made in United States Dollars.
           Payments due on Net Sales of the Elan Royalty Product made in a
           currency other than United States Dollars shall first be calculated
           in the foreign currency and then converted to United States Dollars
           on the basis of the exchange rate in effect for the purchase of
           United States Dollars with such foreign currency quoted in the Wall
           Street Journal (or comparable publication if not quoted in the Wall
           Street Journal) with respect to the currency of the country of origin
           of such payment for the day prior to the date on which the payment by
           the Company is being made.

     7.8.  Subject to the provisions of Clauses 7.10 of this Agreement, the
           Company shall pay all royalties at the rates specified in this Clause
           7.

     7.9.  Elan and the Company agree to co-operate in all respects reasonably
           necessary to take advantage of any double taxation agreements or
           similar agreements as may, from time to time, be available.

     7.10. Any taxes payable by Elan on any payment made to Elan pursuant to
           this Agreement shall be for the account of Elan. If so required by
           applicable law any payment made pursuant to this Agreement shall be
           made by the Company after deduction of the appropriate withholding
           tax in which event the Company shall 

                                       14
<PAGE>
 
           co-operate to the extent reasonably necessary to obtain the
           appropriate tax credits as soon as is practicable. In the event of a
           credit, the Company shall forthwith forward copies of the credit
           documentation to Elan.

8.   RIGHT OF AUDIT AND INSPECTION

     8.1.  [****] the Company shall permit Elan or its duly authorised
           representatives upon reasonable notice and at any reasonable time
           during normal business hours to have access to inspect and audit the
           accounts and records of the Company and any other book, record,
           voucher, receipt or invoice relating to the calculation of the
           royalty payments on Net Sales submitted to Elan and to the accuracy
           of the reports which accompanied them. Any such inspection of the
           Company's records shall be at the expense of Elan, except that if any
           such inspection reveals a deficiency in the amount of the running
           royalty actually paid to Elan hereunder in any calendar quarter of
           [****] or more of the amount of any running royalty actually due to
           Elan hereunder, then the expense of such inspection shall be borne
           solely by the Company. Any amount of deficiency shall be paid
           promptly to Elan. If such inspection reveals a surplus in the amount
           of running royalty actually paid to Elan by the Company, Elan shall
           promptly inform the Company of the existence of such surplus and
           shall reimburse the Company the surplus. The Company shall maintain
           the foregoing records for a period of at least five (5) years
           following the end of the calendar year to which they pertain.

     8.2.  In the event of any unresolved dispute regarding any alleged
           deficiency or overpayment of royalty payments hereunder, the matter
           will be referred to an independent firm of chartered accountants for
           a resolution of such dispute mutually acceptable to both parties. Any
           decision by the said firm of chartered accountants shall be binding
           on the Parties.

9.   PATENTS

     9.1.  The Company shall permanently mark or otherwise cause any Independent
           Third Party to permanently mark all Elan Royalty Products with the
           patent number(s) in respect of the Elan Patents or otherwise provide
           notice of the existence of the Elan Patents for each country in the
           Territory where sales of the Elan Royalty Products are being made in
           a manner compliant with the applicable laws of such country and in
           such manner as Elan may reasonably request in writing prior to the
           sale or commercial use thereof.

     9.2.  Elan shall be obliged to disclose promptly to the Company inventions
           and discoveries made by or on behalf of Elan relating to the Medipad
           System and any patentable inventions and discoveries within the Elan
           Technology which relate to the Field.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       15
<PAGE>
 
     9.3.  The following provisions shall apply to patent filing, prosecution
           and maintenance:

           9.3.1.  Elan, [****] shall have the right but shall not be obligated
                   (a) to secure the grant of any patent from applications
                   within the Elan Technology except those that relate
                   exclusively outside the Field; (b) to file and prosecute
                   patent applications on patentable inventions and discoveries
                   within the Elan Technology except those that relate
                   exclusively outside the Field and patentable improvements
                   developed by or on behalf of Elan; (c) to defend all such
                   applications against Independent Third Party oppositions and
                   interferences; and/or (d) to maintain in force any issued
                   letters patent within the Elan Technology except those that
                   relate exclusively outside the Field (including any letters
                   patent that may issue covering any improvements). Elan shall
                   have the sole right in its reasonable business discretion to
                   control such filing, prosecution, defence and maintenance;
                   provided however, that the Company shall be provided with
                   copies of all documents relating to such filing, prosecution,
                   defence, and maintenance in sufficient time to review such
                   documents and comment thereon prior to filing of such
                   documents.

          9.3.2.   The Company shall have the right, but not the obligation, in
                   the circumstances set out in Clauses 9.3.2(1), (2) and (3)
                   below, [****] to file and prosecute patent application(s)
                   described in Clause 9.3.1 in Elan's name and on Elan's
                   behalf, and Elan upon written request from the Company shall
                   execute all documents, forms and declarations and to do all
                   things as shall be reasonably necessary to enable the Company
                   to exercise such option and right:

                   (1)  Elan elects that it does not intend to file patent
                        applications on patentable inventions and discoveries
                        within the Elan Technology except those that relate
                        exclusively outside the Field or patentable improvements
                        developed by or on behalf of Elan in one or more
                        countries in the Territory. Elan shall make such
                        election and so notify the Company in writing at least 2
                        months prior to the expiration of any applicable time
                        bar or other deadline.

                   (2)  Elan fails to file such an application within a
                        reasonable period of time. Elan shall inform the Company
                        of any applicable time bar or other deadline for each
                        patentable invention at least 2 months prior to the
                        expiration of such applicable time bar or other
                        deadline.


_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       16
<PAGE>
 
                   (3)  Elan elects or fails to maintain or prosecute further
                        any such pending application or issued patent then Elan
                        shall so notify the Company in writing no less than 2
                        months prior to the expiration of any applicable due
                        date or time bar, and after receipt of such notice.

          9.3.3.   In relation to the Company Technology, the Company, [****]
                   shall have the right but shall not be obligated (a) to secure
                   the grant of any patent from applications within the Company
                   Technology; (b) to file and prosecute patent applications on
                   patentable inventions and discoveries within the Company
                   Technology; (c) to defend all such applications against
                   Independent Third Party oppositions or interferences; and (d)
                   to maintain in force any issued letters patent within the
                   Company Technology (including any patents that issue on
                   patentable inventions and discoveries within the Company
                   Technology).

                   The Company shall have the right to control such filing,
                   prosecution, defence and maintenance; provided however, Elan
                   shall be provided with copies of all documents relating to
                   such filing, prosecution, defence, and maintenance in
                   sufficient time to review such documents and comment thereon
                   prior to filing of such documents.

          9.3.4.   In the event that the Company (i) elects that it does not
                   intend to file patent applications on patentable inventions
                   and discoveries within the Company Technology, (ii) fails to
                   file such an application within a reasonable period of time
                   or, (iii) elects or fails to maintain or prosecute further
                   any such pending application or issued patent then the
                   Company shall so notify Elan in writing no less than 2 months
                   prior to the expiration of any applicable due date or time
                   bar, and after receipt of such notice, Elan shall, insofar as
                   it is necessary, have the right, but not the obligation
                   [****] to file and prosecute such patent application(s) in
                   the Company's name and on the Company's behalf and the
                   Company upon written request from Elan shall execute all
                   documents, forms and declarations and to do all things as
                   shall be reasonably necessary to enable Elan to exercise such
                   option and right.

     9.4.  Elan and the Company shall promptly inform the other in writing of
           any alleged infringement of any Elan Patents within the Elan
           Technology that relate to the Field or the Company Technology or any
           alleged misappropriation of trade secrets within the Elan Know-How
           that relate to the Field or the Company Know-How by an Independent
           Third Party of which it becomes aware and provide the other with any
           available evidence of such infringement or misappropriation.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       17
<PAGE>
 
           9.4.1.  Except as provided in Clause 11.6, during the Term, the
                   Company shall have the right but not the obligation to bring
                   suit or otherwise take action [****] and for its own benefit
                   any such alleged infringements of the Elan Patents or
                   misappropriation of the Elan Know-How, insofar as such
                   infringements or misappropriation relate to the Field or the
                   sale, importation, manufacture or use of an infusion device
                   for a compound within the Field.

                   In the event that the Company takes such action, the Company
                   shall do so [****]. At the Company's request, Elan will co-
                   operate with such action insofar as the action relates to the
                   Field or the sale, importation, manufacture or use of an
                   infusion device for a compound within the Field [****] for
                   the purpose of this Agreement and prior to commencing, or at
                   an early stage in the proceedings, the Company and Elan shall
                   agree upon [****].

                   The Company shall keep Elan fully informed of the
                   infringement or misappropriation action and may not enter
                   into any settlement agreement or make any formal written
                   admissions in the course of such actions relating to the Elan
                   Technology without Elan's prior written consent.

                   Should the Company decide not to pursue such infringers,
                   within a reasonable period but in any event within [****]
                   after receiving written notice of such alleged infringement
                   or misappropriation or (ii) [****] before the time limit, if
                   any, set forth in the appropriate laws and regulations for
                   the filing of such actions, including FDA regulations, to the
                   extent applicable, whichever comes first, or if such alleged
                   infringement or misappropriation does not relate to the
                   Field, Elan may in its discretion initiate such proceedings
                   in its own name, [****] and at Elan's request, the Company
                   will co-operate with such action at Elan's sole cost and
                   expense.

                   In the alternative, the Parties may agree to institute such
                   proceedings in their joint names and shall reach agreement as
                   to the [****] Independent Third Party. If the infringement of
                   the Elan Patents affects the Field as well as other products
                   being developed or commercialised by Elan or its commercial
                   partners outside the Field, the Parties shall agree as to the
                   manner in which the proceedings should be instituted and
                   shall reach agreement as to the [****] Independent Third
                   Party.

          9.4.2.   During the Term, the Company shall have the sole right but
                   not the obligation to bring suit or otherwise take action
                   against any alleged infringement of the Company Patents or
                   misappropriation of the Company Know-How.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       18
<PAGE>
 
     9.5.  In the event that a claim or proceedings is brought against the
           Company by an Independent Third Party alleging that the sale,
           distribution or use of the Elan Royalty Product in the Territory
           solely because of the Company's use of the Elan Technology infringes
           the patent rights of such an Independent Third Party, the Company
           shall promptly advise Elan of such threat or suit.

           The Company shall not acknowledge in writing to the Independent Third
           Party or to any other person the validity of the patent rights of
           such Independent Third Party and shall not compromise or settle any
           claim or proceedings or make any formal written admissions in the
           course of proceedings relating thereto without the prior written
           consent of Elan. At its option, Elan may elect to take over the
           conduct of such proceedings from the Company at Elan's expense.

     9.6.  (a) Elan and/or EMT shall have no liability to the Company whatsoever
           or howsoever arising from any losses incurred by the Company as a
           result of having to cease selling Elan Royalty Product or having to
           defer the launch of selling Elan Royalty Product as a result of any
           infringement proceedings ("Loss of ERP Sales"), [****].

           (b) Further, Elan and/or EMT shall have no liability for any enhanced
           damages awarded as a result of any wilful infringement on the part of
           the Company.

           (c) The liability of Elan and/or EMT to the Company shall not be
           limited in respect of any third party claim against the Company
           (including a claim for loss of profits or other consequential damages
           by the relevant third party included in such claim), including any
           suits or other proceedings by the relevant third party against the
           Company arising from such third party claim (and including reasonable
           attorney's fees and expenses), to the extent that such third party
           claim arises or results from, or constitutes a breach by Elan and/or
           EMT of any of the representations or warranties set forth in Clause
           13.4. and provided that the Company has complied with the provisions
           of Clause 13.8.

10.  CONFIDENTIAL INFORMATION

     10.1. The Parties acknowledge that it may be necessary, from time to time,
           to disclose to each other confidential and/or proprietary
           information, including without limitation, the Technologies,
           improvements, Know-How and the Patents relating thereto, inventions,
           works of authorship, trade secrets, specifications, designs, data,
           know-how and other information relating to the Field, the terms of
           this Agreement and the Development Agreement, the Elan Royalty
           Products, processes and services, or the business of the disclosing
           Party ("CONFIDENTIAL INFORMATION").

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       19
<PAGE>
 
          Confidential Information shall be deemed not to include:

          (i)   information that is in the public domain;

          (ii)  information which is made public by the disclosing Party;

          (iii) information which is independently developed by a Party without
                the aid or application of the Confidential Information;

          (iv)  information that is published or otherwise becomes part of the
                public domain without any disclosure by a Party, or on the part
                of a Party's directors, officers, agents, representatives or
                employees;

          (v)   information that becomes available to a Party on a non-
                confidential basis, whether directly or indirectly, from a
                source other than a Party, which source, to the best of the
                Party's knowledge, did not acquire this information on a
                confidential basis; or

          (vi)  information which the receiving Party is required to disclose
                pursuant to:

                (A)  a valid order of a court or other governmental body or any
                     political subdivision thereof or otherwise required by law;
                     or

                (B)  other requirement of law; provided that if the receiving
                     Party becomes legally required to disclose any confidential
                     information, the receiving Party shall give the disclosing
                     Party prompt notice of such fact so that the disclosing
                     Party may obtain a protective order or other appropriate
                     remedy concerning any such disclosure. The receiving Party
                     shall fully co-operate with the disclosing Party in
                     connection with the disclosing Party's efforts to obtain
                     any such order or other remedy. If any such order or other
                     remedy does not fully preclude disclosure, the receiving
                     Party shall make such disclosure only to the extent that
                     such disclosure is legally required.

     10.2.  Any Confidential Information revealed by a Party to another Party
            shall be used by the receiving Party exclusively for the purposes of
            fulfilling the receiving Party's obligations and rights under this
            Agreement and the Development Agreement and for no other purpose.

     10.3.  Each Party agrees to disclose Confidential Information of another
            Party only to those employees, representatives and agents requiring
            knowledge thereof in connection with their duties directly related
            to the fulfilling of the Party's obligations and rights under this
            Agreement. Each Party further agrees to inform all such employees,
            representatives and agents of the terms and provisions of this
            Agreement and their duties hereunder and to obtain their consent
            hereto as a condition of receiving Confidential Information. Each
            Party agrees that it will exercise the same degree of care, but in
            no event less than a reasonable degree,  

                                       20
<PAGE>
 
            and protection to preserve the proprietary and confidential nature
            of the Confidential Information disclosed by a Party, as the
            receiving Party would exercise to preserve its own proprietary and
            Confidential Information. Each Party agrees that it will, upon
            request of a Party, return all documents and any copies thereof
            containing Confidential Information belonging to or disclosed by,
            such Party.

     10.4.  Notwithstanding the above, each Party may use or disclose
            Confidential Information disclosed to it by another Party to the
            extent such use or disclosure is reasonably necessary in filing or
            prosecuting patent applications, prosecuting or defending
            litigation, complying with patent applications, prosecuting or
            defending litigation, complying with applicable governmental
            regulations or otherwise submitting information to tax or other
            governmental authorities, conducting clinical trials, or making a
            permitted sub-license or otherwise exercising its rights hereunder,
            provided that if a Party is required to make any such disclosure of
            the other Party's Confidential Information, other than pursuant to a
            confidentiality agreement, such Party shall inform the other Party,
            allow the other Party to participate in the process and generally
            limit disclosure to the greatest extent possible and seek
            confidential treatment or a protective order.

     10.5.  The provisions relating to confidentiality in this Clause 10 shall
            remain in effect during the Term, and for a period of [****]
            following the expiration or earlier termination of this Agreement.

     10.6.  The Parties agree that the obligations of this Clause 10 are
            necessary and reasonable in order to protect the Parties' respective
            businesses, and each Party expressly agrees that monetary damages
            may be inadequate to compensate a Party for any breach by the other
            Party of its covenants and agreements set forth herein. Accordingly,
            the Parties agree and acknowledge that any such violation or
            threatened violation may cause irreparable injury to a Party and
            that, in addition to any other remedies that may be available, in
            law and equity or otherwise, any Party shall be entitled to seek
            injunctive relief against the threatened breach of the provisions of
            this Clause 10, or a continuation of any such breach by the other
            Party, specific performance and other equitable relief to redress
            such breach together with its damages and reasonable counsel fees
            and expenses to enforce its rights hereunder.


_____________

[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       21
<PAGE>
 
11.  TRADEMARKS

     11.1.  The Company undertakes that all Elan Royalty Products and all
            materials utilised in connection with the provision, marketing,
            distribution, advertising and/or marketing thereof that bear or
            incorporate the Elan Trademark shall be of a consistent and high
            standard of quality, commensurate with the prestige of the Elan
            Trademark and that its use of the Elan Trademark shall conform to
            such reasonable standards as Elan shall from time to time specify.
            The Company shall co-operate fully with the reasonable instructions
            of Elan with respect to the maintenance of such standards.

     11.2.  The Company shall:

            11.2.1.  with reference to Clause 2.2, be obliged to use the Elan
                     Trademarks in each country of the Territory to acknowledge
                     the incorporation of the Medipad System in the Elan Royalty
                     Products in a manner to be mutually agreed by the parties
                     and provide proof of use of the Elan Trademarks if
                     requested by Elan;

            11.2.2.  use the Elan Trademarks strictly in compliance with any
                     applicable trademark and other laws and regulations and to
                     use such legends, markings and notices in connection
                     therewith as are required by law or otherwise reasonably
                     required by Elan to protect Elan's rights therein;

            11.2.3.  do nothing to mislead the public as to the nature or
                     quality of any Elan Royalty Product on which the Elan
                     Trademarks are affixed nor use it on advertising or display
                     materials which are unethical, immoral or offensive to good
                     taste;

            11.2.4.  at Elan's reasonable request, supply samples of the Elan
                     Royalty Products and any materials utilized in connection
                     with the distribution, advertising and/or marketing thereof
                     that bear or incorporate the Elan Trademarks for inspection
                     by Elan;

            11.2.5.  not adopt or seek to register any trademark, design or logo
                     confusingly similar to the Elan Trademarks without Elan's
                     prior written consent; and

            11.2.6.  promptly notify Elan in writing if any alleged infringement
                     or unauthorized use of the Elan Trademarks comes to the
                     Company's attention.

     11.3.  The Company undertakes to use the Elan Trademarks in relation only
            to the Elan Royalty Products (or materials for advertising and
            promotion thereof), and in accordance with any reasonable
            specifications and directions given by Elan from time to time. In
            particular, but without limitation, the Company agrees to state on
            the Elan Royalty Products or materials for the advertising or
            promotion thereof that the Elan Trademarks are used under license
            from Elan.

                                       22
<PAGE>
 
     11.4.  The Company shall take no action which could prejudice the validity,
            re-registration or reputation of the Elan Trademarks or which could
            impair the reputation, business standing or prestige of Elan.

     11.5.  Elan shall remain the owner of the Elan Trademarks and the goodwill
            associated with the same and the Company agrees not to assert any
            ownership interest in the Elan Trademarks or the goodwill associated
            therewith.

     11.6.  Elan shall have the exclusive right to take such action in respect
            of the registration, defence, infringement and maintenance of the
            Elan Trademarks as Elan in its reasonable business judgement deems
            appropriate. The Company shall provide all such assistance and co-
            operation, including the furnishing of documents and information and
            the execution of registered user documentation or the like, as may
            be required to give effect to any action as may be taken, or
            required to be taken, by Elan. In taking any such action, Elan shall
            consider the legitimate commercial interests of the Company.

     11.7.  New trademarks used in relation to the Elan Technology and all
            registrations thereof and applications therefor shall be owned and
            registered by Elan and shall constitute Elan Trademarks.

12.  TERM AND TERMINATION

     12.1.  This Agreement is concluded for a period commencing as of the
            Effective Date and expiring on a Elan Royalty Product by Elan
            Royalty Product basis and on a country by country basis on the later
            to occur of :

            12.1.1. 15 years starting from the date of execution hereof; and

            12.1.2. the date of expiration of the last to expire patent included
                    in the Elan Patents that claims such Elan Royalty Product;
                    (the "TERM").

     12.2.  If this Agreement is not earlier terminated in accordance with this
            Clause 12, at the end of the Term for each country of the Territory,
            the Company shall have a paid-up non-exclusive licence to the Elan
            Technology for the Field in such country and the parties shall
            negotiate in good faith as to which of the terms of this Agreement
            shall continue in full force and effect, should the Company wish to
            continue to have rights hereunder, provided that the parties agree
            that Clauses 7.1, 7.2, 12.3.2, 12.4 and 12.5 shall not continue in
            force or effect.

     12.3.1.   For the purpose of this Clause 11.3, a "RELEVANT EVENT" is
               committed by Elan or the Company if:

          (i)  it commits a material breach of one of its material obligations
               under this Agreement and fails to remedy such breach  within 60
               days of being specifically required in writing to do so by the
               other Party; provided, however, that if the breaching Party has
               proposed a course of action to rectify the breach and is acting
               in good faith and with due diligence to

                                       23
<PAGE>
 
               rectify same but has not cured the breach by the 60th day, such
               rectifying period shall be extended by an amount of time as is
               reasonably necessary to permit the breach to be rectified;

          (ii) it ceases, wholly or substantially, to carry on its business,
               other than for the purpose of a reorganization, without the prior
               written consent of Elan in the case of the Company, or the
               Company in the case of Elan (such consent not to be unreasonably
               withheld);

         (iii) the voluntary appointment of a liquidator, receiver,
               administrator, examiner, trustee or similar officer over all or
               substantially all of its assets under the laws of its state or
               country of incorporation; or

          (iv) an application or petition for bankruptcy, corporate
               reorganization, composition, administration, examination,
               arrangement or any other procedure similar to any of the
               foregoing under the laws of its state or country of
               incorporation, is filed, and is not discharged within 90 days.

       12.3.2. If Elan commits a Relevant Event, the Company shall have in
               addition to all other legal and equitable rights and remedies
               hereunder, the right to terminate this Agreement upon 30 days'
               written notice; provided, that such written notice be given
               within 60 days following the date that the Company becomes aware
               of the Relevant Event.

               If the Company commits a Relevant Event, Elan shall have in
               addition to all other legal and equitable rights and remedies
               hereunder, the right to terminate this Agreement upon 30 days'
               written notice; provided, that such written notice be given
               within 60 days following the date that Elan becomes aware of the
               Relevant Event.

     12.4.  In the event that a [****] shall, directly or indirectly[****] or
            otherwise [****] shall be entitled to forthwith [****] to [****].

     12.5.  Upon a termination coming into effect after an exercise of those
            rights of termination as specified in this Clause 12 or elsewhere
            within the Agreement, this Agreement shall, subject to the other
            provisions of the Agreement, automatically terminate forthwith and
            be of no further legal force or effect.

     12.6.  Upon termination of the Agreement (but not for an expiration, for
            which Clause 12.2 shall apply)


_____________

[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       24
<PAGE>
 
          12.6.1.  except as expressly provided for under Clause 12.6.2 all
                   rights, licenses and sublicenses granted in and pursuant to
                   this Agreement shall cease for the Territory or for such
                   particular country or countries in the Territory (as the case
                   may be). Following such termination, the Company may not
                   thereafter, except as expressly provided for in Clause
                   12.6.2, use in the Territory or in such particular country or
                   countries in the Territory (as the case may be) (a) any
                   Subsisting Elan Patents and improvements, (b) any Elan Know-
                   How that remains confidential or otherwise proprietary to
                   Elan, and/or (c) any Elan Trademark; and

          12.6.2.  the Company shall promptly make an accounting to Elan of the
                   inventory of the Elan Royalty Product which it has in the
                   Territory or for such particular country or countries in the
                   Territory (as the case may be), if any, as of the date of
                   such termination and the Company shall thereafter have the
                   right for a period of six (6) months after said termination
                   to sell such inventory of the Elan Royalty Product in the
                   Territory or in such particular country or countries in the
                   Territory (as the case may be) or, if appropriate and legally
                   permissible, to transport such inventory of Elan Royalty
                   Product for sale in another country or countries in the
                   Territory within such six month period; provided that the Net
                   Sales thereof shall be subject to the royalty provisions of
                   Clause 7 and so payable to Elan. Thereafter, any remaining
                   inventory of Elan Royalty Product shall be disposed of by
                   mutual agreement of the Parties in accordance with regulatory
                   requirements.

     12.7.  Upon expiration or termination of the Agreement:

            12.7.1.  any sums that were due from the Company to Elan on Net
                     Sales in the Territory or in such particular country or
                     countries in the Territory (as the case may be) prior to
                     the expiration or termination of this Agreement as set
                     forth herein shall be paid in full within 60 days of the
                     expiration or termination of this Agreement for the
                     Territory or for such particular country or countries in
                     the Territory (as the case may be);

            12.7.2.  all confidentiality provisions set out herein shall remain
                     in full force and effect;

            12.7.3.  the rights of inspection and audit set out in Clause 8
                     shall continue in force for a period of one year;

            12.7.4.  Elan shall retain all rights to the Elan Technology and
                     improvements to the Elan Technology;

            12.7.5.  the Company shall retain all rights to the Company
                     Technology and improvements to the Company Technology;

            12.7.6.  rights of permitted third party sublicensees in and to the
                     Elan Technology and the Company Technology shall survive
                     the termination of the license;

                                       25
<PAGE>
 
                     and Endorex and Elan shall in good faith agree upon the
                     form most advantageous to Elan and Endorex in which the
                     rights of the sublicensor under any such sublicenses are to
                     be held (which form may include continuation of the Company
                     solely as the holder of such licenses or assignment of such
                     rights to a third party or parties, including an assignment
                     to both Elan and Endorex).

            12.7.7.  the Company shall promptly make an accounting to Elan of
                     the inventory of the Elan Royalty Product which it has in
                     the Territory or for such particular country or countries
                     in the Territory (as the case may be), if any, as of the
                     date of such termination and the Company shall thereafter
                     have the right for a period of six (6) months after said
                     expiration or termination to sell such inventory of the
                     Elan Royalty Product in the Territory or in such particular
                     country or countries in the Territory (as the case may be)
                     or, if appropriate and legally permissible, to transport
                     such inventory of Elan Royalty Product for sale in another
                     country or countries in the Territory within such six month
                     period; provided that the Net Sales thereof shall be
                     subject to the royalty provisions of Clause 7 and so
                     payable to Elan. Thereafter, any remaining inventory of
                     Elan Royalty Product shall be disposed of by mutual
                     agreement of the Parties in accordance with regulatory
                     requirements.

13.  WARRANTIES/INDEMNITIES

     13.1.  Elan and EMT represents and warrants to the Company that to their
            respective best knowledge, after reasonable investigations:-

            13.1.1.  Elan and EMT have the right to grant the licenses and
                     rights granted herein;

            13.1.2.  Schedule 1 contains a summary of the primary pending patent
                     applications and issued patents comprising the Elan Patents
                     existing as of the Effective Date;

            13.1.3.  there are no agreements between Elan, EMT, NanoSystems or
                     Sano and any Independent Third Parties that conflict with
                     the rights granted by Elan in or pursuant to this
                     Agreement,

     13.2.  Elan represents and warrants to the Company that the Elan Patents
            listed in Schedule 1 are solely owned by Elan or EMT and are free
            and clear of encumbrances and liens.

     13.3.  The Company represents and warrants to Elan that it has the sole,
            exclusive and unencumbered right to grant the licenses and rights
            herein granted to Elan and that it has not granted any option,
            license, right or interest in or to the Company Technology to any
            Independent Third Party which would conflict with the rights granted
            by this Agreement.

                                       26
<PAGE>
 
     13.4.  Elan represents and warrants to the Company as of the date of the
            Effective Date:-

            13.4.1.  [****];

            13.4.2.  [****]; and

            13.4.3.  [****].

     13.5.  In addition to any other indemnifications provided for herein, Elan
            shall indemnify and hold harmless the Company and its Affiliates and
            their respective employees, agents, partners, officers and directors
            from and against any claims, losses, liabilities or damages
            (including reasonable attorney's fees and expenses) incurred or
            sustained by the Company arising out of or in connection with any
            breach of any representation, covenant, warranty or obligation by
            Elan or EMT hereunder.

     13.6.  In addition to any other indemnifications provided for herein, the
            Company shall indemnify and hold harmless Elan and its Affiliates
            and their respective employees, agents, partners, officers and
            directors from and against any claims, losses, liabilities or
            damages (including reasonable attorney's fees and expenses) incurred
            or sustained by Elan arising out of or in connection with any breach
            of any representation, covenant, warranty or obligation by the
            Company hereunder.

     13.7.  The Company shall assume the sole and entire responsibility and
            shall indemnify and save harmless Elan from any and all claims,
            liabilities, expenses, including reasonable attorney's fees,
            responsibilities and damages by reason of any claim, proceedings,
            action, liability or injury arising out of any faults of the Elan
            Royalty Products resulting from the transport, packaging, storage,
            handling, distribution, marketing or sale of the Elan Royalty
            Products by the Company, to the extent that it was caused by the
            negligence or wrongful acts or omissions on the part of the Company.

     13.8.  As a condition of obtaining an indemnity in the circumstances set
            out above, the Party seeking an indemnity shall:

            13.8.1.  fully and promptly notify the other Party of any claim or
                     proceeding, or threatened claim or proceeding;

            13.8.2.  permit the indemnifying Party to take full care and control
                     of such claim or proceeding;

            13.8.3.  co-operate in the investigation and defence of such claim
                     or proceeding;

_____________

[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       27
<PAGE>
 
          13.8.4.  not compromise or otherwise settle any such claim or
                   proceeding or make any formal written admission in the course
                   of proceedings without the prior written consent of the other
                   Party, which consent shall not be unreasonably withheld
                   conditioned or delayed; and

          13.8.5.  take all reasonable steps to mitigate any loss or liability
                   in respect of any such claim or proceeding.

     13.9.  [****] NOTWITHSTANDING ANYTHING TO THE CONTRARY IN THIS AGREEMENT,
            NONE OF THE PARTIES SHALL BE LIABLE TO THE OTHERS BY REASON OF ANY
            REPRESENTATION OR WARRANTY, CONDITION OR OTHER TERM OR ANY DUTY OF
            COMMON LAW, OR UNDER THE TERMS OF THIS AGREEMENT, FOR ANY
            CONSEQUENTIAL, INDIRECT OR INCIDENTAL LOSS OR DAMAGE (WHETHER FOR
            LOSS OF PROFIT OR OTHERWISE) AND WHETHER OCCASIONED BY THE
            NEGLIGENCE OF THE RESPECTIVE PARTIES, THEIR EMPLOYEES OR AGENTS OR
            OTHERWISE.

14.  INSURANCE

     14.1.  Elan shall maintain comprehensive general liability insurance,
            including product liability insurance on the Elan Royalty Products
            manufactured and/or sold by Elan in such prudent amount as shall be
            determined by the Management Committee. Elan shall provide the
            Company with a certificate from the insurance company verifying the
            above and undertakes to notify the Company directly at least 30 days
            prior to the expiration or termination of such coverage. Elan shall
            also provide the Company with a vendor's certificate substantially
            in a form to be agreed between the Parties.

     14.2.  The Company shall maintain comprehensive general liability
            insurance, including product liability insurance on Elan Royalty
            Products manufactured and/or sold by the Company that incorporate
            intellectual property licensed hereunder by Elan in such prudent
            amount as shall be determined by the Management Committee. The
            Company shall provide Elan with a certificate from the insurance
            company verifying the above and undertakes to notify Elan 30 days
            prior to the expiration or termination of such coverage.



_____________

[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       28
<PAGE>
 
15.  IMPOSSIBILITY OF PERFORMANCE - FORCE MAJEURE

     15.1.  Neither Party to this Agreement shall be liable for delay in the
            performance of any of its obligations hereunder if such delay
            results from causes beyond its reasonable control, including,
            without limitation, acts of God, fires, strikes, acts of war, or
            intervention of a government authority, non availability of raw
            materials, but any such delay or failure shall be remedied by such
            Party as soon as practicable.

16.  SETTLEMENT OF DISPUTES; PROPER LAW

     16.1.  The Parties will attempt in good faith to resolve any dispute
            arising out of or relating to this Agreement promptly by negotiation
            between executives of the Parties, failing which the Parties shall
            invoke the dispute resolution provisions set forth in Clause 15 of
            the Development Agreement.

     16.2.  This Agreement shall be governed by and construed in accordance with
            the laws of New York and subject to the provisions of Clause 16.1,
            the Parties agree to submit to the jurisdiction of the courts of New
            York for the resolution of disputes hereunder, which the Parties
            have not otherwise agreed should be subject to the binding
            determination of an Expert or Panel, pursuant to the terms of this
            Agreement.

17.  ASSIGNMENT

     17.1.  This Agreement may not be assigned by either Party without the prior
            written consent of the other, which consent in relation to the
            proposed assignment to an Affiliate of Elan or the Company, as the
            case may be, shall not be unreasonably withheld, conditioned or
            delayed.

18.  NOTICES

     18.1.  Any notice to be given under this Agreement shall be sent in writing
            in English by registered mail, airmail, reputable courier or
            recorded delivery post, or telecopied (with a confirmation copy
            promptly sent by mail) to:

            if to Elan:          Elan Corporation, plc 
                                 Lincoln House                               
                                 Lincoln Place                               
                                 Dublin 2, Ireland                           
                                 Telecopier: 353 1 662 4960                  
                                 Attention:  Vice President & General Counsel  
                                             Elan Pharmaceutical Technologies

          with a copy to:        Brock Fensterstock Silverstein & McAuliffe LLC
                                 153 East 53rd Street
                                 56th Floor
                                 New York, New York  10022

                                       29
<PAGE>
 
                                 Telecopier: 1 212 371 5500 
                                 Attention: David Robbins   

          if to the Company:     Endorex Newco, Ltd. 

                                 Clarendon House                      
                                 2 Church Street                   
                                 Hamilton, Bermuda                 
                                 Telecopier: 001 441 292 4720      
                                 Attention:  Chairman               

          with a copy to:        Brobeck, Phleger & Harrison LLP 
                                 1633 Broadway             
                                 47th Floor              
                                 New York, New York 10019 
                                 Telecopier: 1 212 586 7878       
                                 Attention: Nigel Howard 

          if to the Endorex:     Endorex Corporation 
                                 900 Lake Shore Drive               
                                 Lake Bluff, Illinois 60044        
                                 Telecopier: 001 847 604 8570      
                                 Attention:  President              

          with a copy to:        Brobeck, Phleger & Harrison LLP 
                                 1633 Broadway                  
                                 47th Floor                     
                                 New York, New York 10019       
                                 Telecopier: 1 212 586 7878     
                                 Attention: Nigel Howard         

          if to Elan:            Elan Medical Technologies Ltd.  
                                 Monksland                                     
                                 Athlone                                      
                                 Co. Westmeath, Ireland                       
                                 Telecopier: 353 1 662 4960                   
                                 Attention:   Vice President & General Counsel 
                                              Elan Pharmaceutical Technologies

          with a copy to:        Brock Fensterstock Silverstein & McAuliffe LLC
                                 153 East 53rd Street            
                                 56th Floor                    
                                 New York, New York  10022     
                                 Telecopier: 1 212 371 5500    
                                 Attention: David Robbins       

          or to such other address(es) as may from time to time be notified by
          any Party to the others hereunder.

                                       30
<PAGE>
 
     18.2.  Any notice sent by mail shall be deemed to have been delivered
            within 7 working days after dispatch, any notice sent by reputable
            courier shall be deemed to have been delivered within 2 working days
            after dispatch and any notice sent by telecopy shall be deemed to
            have been delivered within 24 hours of the time of the dispatch.
            Notices of change of address shall be effective upon receipt.

19.  MISCELLANEOUS CLAUSES

     19.1.  No waiver of any right under this Agreement shall be deemed
            effective unless contained in a written document signed by the Party
            charged with such waiver, and no waiver of any breach or failure to
            perform shall be deemed to be a waiver of any other breach or
            failure to perform or of any other right arising under this
            Agreement.

     19.2.  If any provision in this Agreement is agreed by the Parties to be,
            or is deemed to be, or becomes invalid, illegal, void or
            unenforceable under any law that is applicable hereto, (i) such
            provision will be deemed amended to conform to applicable laws so as
            to be valid and enforceable or, if it cannot be so amended without
            materially altering the intention of the Parties, it will be
            deleted, with effect from the date of such agreement or such earlier
            date as the Parties may agree, and (ii) the validity, legality and
            enforceability of the remaining provisions of this Agreement shall
            not be impaired or affected in any way.

     19.3.  The Parties shall use their respective reasonable endeavors to
            ensure that the Parties and any necessary Independent Third Party
            shall do, execute and perform all such further deeds, documents,
            assurances, acts and things as any of the Parties hereto may
            reasonably require by notice in writing to the other Party or such
            Independent Third Party to carry out the provisions of this
            Agreement.

     19.4.  This Agreement shall be binding upon and enure to the benefit of the
            Parties hereto, their successors and permitted assigns and sub-
            licensees.

     19.5.  No provision of this Agreement shall be construed so as to negate,
            modify or affect in any way the provisions of any other agreement
            between the Parties unless specifically referred to, and solely to
            the extent provided, in any such other agreement. In the event of a
            conflict between the provisions of this Agreement and the provisions
            of the Development Agreement, the terms of the Development Agreement
            shall prevail unless this Agreement specifically provides otherwise.

     19.6.  No amendment, modification or addition hereto shall be effective or
            binding on either Party unless set forth in writing and executed by
            a duly authorized representative of each Party.

     19.7.  This Agreement may be executed in any number of counterparts, each
            of which when so executed shall be deemed to be an original and all
            of which when taken together shall constitute this Agreement.

                                       31
<PAGE>
 
     19.8.  Each of the Parties undertake to do all things reasonably within its
            power which are necessary or desirable to give effect to the spirit
            and intent of this Agreement.

     19.9.  Each of the Parties hereby acknowledges that in entering into this
            Agreement it has not relied on any representation or warranty save
            as expressly set out herein or in any document referred to herein.

     19.10. Nothing contained in this Agreement is intended or is to be
            construed to constitute Elan and the Company as partners, or Elan as
            an employee of the Company, or the Company as an employee of Elan.
            Neither Party hereto shall have any express or implied right or
            authority to assume or create any obligations on behalf of or in the
            name of the other Party or to bind the other Party to any contract,
            agreement or undertaking with any Independent Third Party.

                                       32
<PAGE>
 
IN WITNESS THEREOF the Parties hereto have executed this License Agreement in
quadruplicate.


SIGNED BY
For and on behalf of
ELAN CORPORATION, PLC

/s/ Liam Daniel

SIGNED BY
For and on behalf of
ELAN MEDICAL TECHNOLOGIES LTD.

/s/ Liam Daniel

SIGNED BY
For and on behalf of
ENDOREX CORPORATION

/s/ Michael S. Rosen
President and Chief Executive Officer

SIGNED BY
For and on behalf of
ENDOREX NEWCO, LTD.

/s/ Michael S. Rosen
Chairman

                                       33
<PAGE>
 
                                  SCHEDULE 1

                                 ELAN PATENTS

                                 See attached
<PAGE>
 
                      MEDIPAD(R) SYSTEM PATENT PORTFOLIO

                    INTRADERMAL DRUG DELIVERY DEVICE [****]

<TABLE>
<CAPTION>
COUNTRY          FILED           SERIAL NO.    STATUS                     
<S>              <C>             <C>           <C>                        
Australia         11/17/1994       10763/95     Issued                    
                                                                          
                              [****]                              
New Zealand       11/17/1994         276485     Issued                     
South Africa      11/18/1994        94/9185     Issued                    
Taiwan            11/15/1994       83110594     Issued                    
United States     01/18/1994     08/183,482     Issued                     

                              [****]
</TABLE> 


_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.
<PAGE>
 
                       MEDICAMENT DELIVERY DEVICE [****]

                  (VIAL ON BOARD AND NEEDLE ON THE PERIPHERY)

<TABLE>
<CAPTION>
COUNTRY            FILED          SERIAL NO.         STATUS
<S>                <C>            <C>                <C>
                                    [****]

Ireland            09/11/1995         950702         Issued
 
                                    [****]
South Africa       09/05/1996        96/7502         Issued
 
                                    [****]
United States      09/11/1996     60/003,673         Expired
                   09/06/1996      5,814,020         Issued
 
                                    [****]
</TABLE>


_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.
<PAGE>
 
                      MEDICAMENT CONVERSION SYSTEM [****]
                           LYOPHILIZED DRUG SYSTEM I

<TABLE>
<CAPTION>
COUNTRY                 FILED                 SERIAL NO.      STATUS
<S>                     <C>                   <C>             <C>
                                    [****]

South Africa            09/07/1995            96/7444         Issued
 
                                    [****]
United States           09/07/1995            60/003,559      Expired    
                        09/06/1996            08/709,486      Pending    
 
                                    [****]
</TABLE> 

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

                  CARTRIDGE-BASED DRUG DELIVERY DEVICE[****]

                               (BOLUS MEDIPAD I)

<TABLE>
<CAPTION>
COUNTRY             FILED                 SERIAL NO.         STATUS
<S>                 <C>                   <C>                <C>
                                    [****]

South Africa        12/10/1996            96/10374           Issued
Taiwan              02/11/1997            86101675           Issued
 
                                    [****]
</TABLE> 


_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.
<PAGE>
 
                            DELIVERY NEEDLE [****]

<TABLE>
<CAPTION>
COUNTRY               FILED             SERIAL NO.          STATUS
<S>                   <C>               <C>                 <C>
                                    [****]

South Africa          06/09/1997               97/5065      Issued
Taiwan                07/19/1997              86110263      Published
United States         06/13/1996            60/019,714      Expired[****]
WIPO                  06/04/1997        PCT/IE97/00041      Published
</TABLE> 

(Australia, Brazil, Canada, China, Czech Republic, Hungary, Israel, Norway, New
Zealand, Poland, Russian Federation, Ukraine, United States of America, EP)

                                    [****]


_______________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.
<PAGE>
 
SCHEDULE 2

                                ELAN TRADEMARKS

                                 See attached
<PAGE>
 
                    MEDIPAD(R) AND ELAN TRADEMARK PORTFOLIO

                                  ELAN & LOGO

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
COUNTRY               REG./APPL. NO.      REG./FILING DATE          STATUS           INTL. CLASS(ES)   
- -----------------------------------------------------------------------------------------------------------
<S>                   <C>                 <C>                     <C>                <C>                
Denmark                   VA 00147 1994             01/05/94      Pending                             5,10
- -----------------------------------------------------------------------------------------------------------
Finland                          140765             11/20/95      Registered                          5,10
- -----------------------------------------------------------------------------------------------------------
France                         92400967           01/13/1992      Registered                          10,5
- -----------------------------------------------------------------------------------------------------------
Ireland                          128883           08/18/1988      Registered                             5
- -----------------------------------------------------------------------------------------------------------
Italy                            684515           07/25/1996      Registered                    10, 29, 30
                                                                                                         5
- -----------------------------------------------------------------------------------------------------------
Japan                           4095230           12/19/1997      Registered                             5
- -----------------------------------------------------------------------------------------------------------
Norway                           179263           01/23/1997      Registered                         10, 5
- -----------------------------------------------------------------------------------------------------------
Sweden                           326479           03/06/1990      Registered                        05, 10
- -----------------------------------------------------------------------------------------------------------
Switzerland                      408317           03/23/1993      Registered                             5
- -----------------------------------------------------------------------------------------------------------
United States                 1,645,769           05/28/1991      Registered                             5
- ----------------------------------------------------------------------------------------------------------- 
</TABLE>

                                   ELAN LOGO

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
COUNTRY               REG./APPL. NO.      REG./FILING DATE          STATUS           INTL. CLASS(ES)
- -----------------------------------------------------------------------------------------------------------
<S>                 <C>                   <C>                      <C>               <C>
Denmark             VR 02/593 1994          04/22/1994             Registered           10, 5
- -----------------------------------------------------------------------------------------------------------
Ireland                     128884           08/18/1998            Registered               5
- -----------------------------------------------------------------------------------------------------------
Switzerland (B)            404.111           01/18/1993            Registered            10,5
Switzerland (A)            404.110           01/18/1993            Registered            10,5
- -----------------------------------------------------------------------------------------------------------
United States            1,644,210           05/14/1991            Registered               5
- -----------------------------------------------------------------------------------------------------------
</TABLE>

                                    MEDIPAD

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
COUNTRY               REG./APPL. NO.      REG./FILING DATE          STATUS           INTL. CLASS(ES)
- -----------------------------------------------------------------------------------------------------------
<S>                   <C>                 <C>                  <C>                  <C>
Ireland (A)                      163887           11/23/1994  Registered                             5
Ireland (B)                      163886           11/23/1994  Registered                            10
- -----------------------------------------------------------------------------------------------------------
United Kingdom                  2003655           09/05/1997  Registered                         10, 5
- -----------------------------------------------------------------------------------------------------------
United States                 2,183,377           08/25/1998  Registered                            10
- -----------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>
 
                                  SCHEDULE 3

                       TYPE II TECHNOLOGICAL COMPETITOR

[****]



[****]   REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR 
         CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES 
         EXCHANGE ACT OF 1934, AS AMENDED.

<PAGE>
 
                                                                   EXHIBIT 10.24
                                      CONFIDENTIAL TREATMENT HAS BEEN SOUGHT FOR
                                 PORTIONS OF THIS EXHIBIT PURSUANT TO RULE 24B-2
                           UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED




                   JOINT DEVELOPMENT AND OPERATING AGREEMENT

                            ELAN CORPORATION, PLC,

                      ELAN INTERNATIONAL SERVICES, LTD.,

                             ENDOREX CORPORATION,

                                      AND

                              ENDOREX NEWCO, LTD.
<PAGE>
 
JOINT DEVELOPMENT AND OPERATING AGREEMENT, made as of October 21, 1998 by and
among ELAN CORPORATION, PLC, a public limited company incorporated under the
laws of Ireland ("Elan"), ELAN INTERNATIONAL SERVICES, LTD., a Bermuda
corporation ("EIS"), ENDOREX CORPORATION, a Delaware corporation ("Endorex"),
and ENDOREX NEWCO, LTD., a Bermuda corporation (the "Company").

                                   RECITALS

A.   Endorex has proprietary know-how and expertise relating to, inter alia, the
     research, development and commercialization of pharmaceutical formulations
     capable of delivering drugs.

B.   Elan is knowledgeable in the discovery, research, development, manufacture
     and marketing of pharmaceutical formulations and devices capable of
     delivering drugs, including the Medipad System.  Elan owns or has licensed
     the Elan Technology either itself or through EMT (defined below).  Elan
     also owns and uses certain trademarks in connection with the manufacture,
     marketing and sale of the Medipad System, including the Elan Trademarks.
     Elan Medical Technologies Limited is a wholly owned subsidiary of Elan
     ("EMT").

C.   EIS and Endorex have, as of the date hereof, subscribed for the initial
     share capital of the Company and agreed to co-operate in the management of
     its business, which will be to research and develop certain Elan Royalty
     Products incorporating the technologies developed and/or to be developed by
     Elan and Endorex and to distribute and sell such Elan Royalty Products
     throughout the world.

D.   Elan, EIS, Endorex and the Company have agreed to enter into this Agreement
     for the purpose of recording the terms and conditions of the Joint Venture
     and regulating their relationship with each other and certain aspects of
     the affairs of and their dealings with the Company.

                                   AGREEMENT

          The parties hereto agree as follows:

                                   CLAUSE 1

                                  DEFINITIONS

1.1  In this Agreement, the following expressions shall, where not inconsistent
     with the context, have the following meanings respectively.

     "AFFILIATE" means any corporation or entity, other than the Company,
     controlling, controlled or under the common control of Elan or Endorex, as
     the case may be.  For the purposes of this definition, "Control" shall mean
     direct or indirect ownership of fifty percent (50%) or more of the stock or
     shares entitled to vote for the election of directors;

     "AGREED" means agreed by all Parties and confirmed in writing;
<PAGE>
 
     "AGREEMENT" means this agreement (which expression shall be deemed to
     include the Recitals and the Schedules hereto);

     "BUSINESS" means the business of the Company as described in Clause 2 and
     as more particularly specified in the Plan and such other business as the
     Parties may agree from time to time in writing should be carried on by the
     Company;

     "COMPANY COMPOUND(S)" means the [****] compounds made, invented, acquired,
     developed or licensed by the Company and, if applicable, any Substitute
     Compound;

     "COMPANY SUBSCRIPTION AGREEMENT" means the Subscription and Stockholders
     Agreement of the Company, made by and between EIS, Endorex and the Company
     as of the date hereof;

     "COMPANY TECHNOLOGY" shall have the meaning as such term is defined in the
     License Agreement;

     "COST" means, depending upon the context, one of the following:

     In the case of the [****] Cost shall comprise, [****] excluding [****].

     In the case of [****] Cost will be calculated, [****] and will exclude
     [****].

     In the case of [****] Cost will comprise the amount [****] including
     [****].

     "DIRECTORS" means the members of the Company's board of directors, as more
     fully described in Clause 12;

     "DISPUTE" means, collectively, a Committee Dispute and a Management
     Dispute, each as defined in Clause 15;

     "EFFECTIVE DATE" means the date hereof;

     "ELAN DIRECTOR" means a director or directors of the Company to be
     appointed by EIS pursuant to Clause 12;

     "ELAN ROYALTY PRODUCT" means a Medipad(TM) System based on, using and/or
     incorporating the Elan Technology and containing a Company Compound, and,
     if applicable, any Substitute Product;

     "ELAN TECHNOLOGY" shall have the meaning as such term is defined in the
     License Agreement;

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       3
<PAGE>
 
     "ELAN TRADEMARKS" shall have the meaning as such term is defined in the
     License Agreement;

     "EXCHANGE RIGHT" means the right of Elan, as described in the Company
     Subscription and Stockholders Agreement made by and among EIS, Endorex and
     the Company, as of the date hereof, whereby Elan may increase its ownership
     percentage of the common stock of the Company to 50 %;.

     "ENDOREX DIRECTOR" means any director or directors of the Company appointed
     by Endorex, pursuant to Clause 12;

     "EXPERT" shall have the meaning assigned to it in Clause 15.5;

     "FIELD" means the research, development, and commercialization of

     (i)   [****] or

     (ii)  the Substitute Compound;

     "FINANCIAL YEAR" means that time period commencing on  January 1st and
     expiring on  December 31st of each calendar year;

     "GLP" AND "GMP" means current Good Laboratory Practises and current Good
     Manufacturing Practises, respectively;

     "INDEPENDENT THIRD PARTY" means any Person other than Elan, Endorex, the
     Company and/or any of their respective Affiliates;

     "KNOW-HOW" means all trade secrets, confidential scientific, technical and
     medical information and expertise, technical data and marketing
     information, studies and data including, but not limited to, unpatented
     inventions, discoveries, designs, theories, plans, ideas (whether or not
     reduced to practice);

     "LICENSE AGREEMENT" means the license agreement between Elan, Endorex, the
     Company and EMT dated as of the date hereof;

     "MANAGEMENT COMMITTEE" shall have the meaning as such term is defined in
     Clause 3;

     "MEDIPAD SYSTEM" means Elan's ambulatory, subcutaneous, micro-infusion pump
     device and related technology;

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       4
<PAGE>
 
     "PANEL" shall have the meaning as such term is defined in Clause 15;

     "PARTICIPANT" means Endorex or Elan, as the case may be, and "PARTICIPANTS"
     means each of the Participants together;

     "PARTY" means Elan, EIS, Endorex or the Company, as the case may be, and
     "Parties" means all or some of them together, as applicable;

     "PATENTS" means all and any patents and any applications therefor in the
     Territory (including any and all divisions, continuations, continuations-
     in-part, extensions, additions or reissues thereto or thereof);

     "PERSON" shall mean an individual, partnership, corporation, limited
     liability company, business trust, joint stock company, trust,
     unincorporated association, joint venture, or other entity of whatever
     nature;

     "PLAN" means the plans to be prepared and approved by the Directors,
     including mutual agreement of the Elan Director and the Endorex Director,
     pursuant to Clause 14, in conjunction with the Research and Development
     Program, for the conduct of the Business of the Company for each Financial
     Year for the duration of this Agreement which shall include, in particular,
     details of the planned budget for research and development expenses to be
     incurred in that Financial Year, for which each of the Participants shall
     be responsible, and how such expenses shall be funded;

     "PROVIDING PARTY" shall have the meaning assigned to such term in Clause
     4.4;

     "R&D COMMITTEE" means the committee established pursuant to Clause 3.2;

     "REGULATORY APPLICATION" means any regulatory application or any other
     application for marketing approval for an Elan Royalty Product but not the
     Medipad System alone, which the Company will file in any country of the
     Territory, including any supplements or amendments thereto;

     "REGULATORY APPROVAL" means the final approval to market an Elan Royalty
     Product but not the Medipad System alone, in any country of the Territory,
     including pricing and reimbursement approval and any other approval which
     is required to launch the Elan Royalty Product in the normal course of
     business;

     "RELEVANT EVENT" shall have the meaning as such term is defined in Clause
     16;

     "RESEARCH AND DEVELOPMENT PROGRAM" means the program of research and
     development work being conducted or to be conducted for and on behalf of
     the Company which have been devised by the R&D Committee and approved by
     the Management Committee;

     "RHA" means any relevant government health authority (or successor agency
     thereof) in any country of the Territory whose approval is necessary to
     market an Elan Royalty Product in the relevant country of the Territory;

                                       5
<PAGE>
 
     "SHARES" means the common stock of the Company, par value $1.00 per share;

     "SUBSIDIARY" of any Person means any other Person, (i) of which (or in
     which) greater than 50% of (A) the outstanding capital stock having
     ordinary voting power to elect a majority of the board of directors of such
     second Person, if a corporation, (B) the interest in the capital or profits
     of such second Person, if a partnership or other entity, or (C) the
     beneficial interest of such trust or estate, if a trust or estate, is at
     the time directly or indirectly owned by such first Person, by such first
     Person and one or more other Subsidiaries of such first Person, or by one
     or more other Subsidiaries of such first Person; (ii) which is otherwise
     effectively controlled by such first Person or any other Subsidiary of such
     first Person, pursuant to contract, arrangement, understanding or
     otherwise; or (iii) or any other corporation, association or other business
     entity that is required by GAAP to be combined or consolidated with such
     Person.

     "SUBSTITUTE PRODUCT" means a Medipad System based on, using and/or
     incorporating the Elan Technology and/or the Company Technology a
     Substitute Compound, including but not limited to patents and know-how that
     may be acquired by or on behalf of the Company;

     "SUBSTITUTE COMPOUND" means the substitute compound described in Clause 3
     of the License Agreement;

     "TECHNOLOGIES" means collectively, the Company Technology and the Elan
     Technology;

     "TERRITORY" means [****];

     "TERM" shall have the meaning assigned to such word in Clause 16.1;

     "TECHNOLOGICAL COMPETITOR" means a Type I Technological Competitor or a
     Type II Technological Competitor;

     "THIRD PARTY TECHNOLOGY" shall have the meaning assigned to it in Clause
     3.1. of the License Agreement;

     "TYPE I TECHNOLOGICAL COMPETITOR" means [****];

     "TYPE II TECHNOLOGICAL COMPETITOR" shall mean [****];

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       6
<PAGE>
 
     "UNITED STATES DOLLAR" and "US$" means the lawful currency of the United
     States of America.

1.2  Words importing the singular shall include the plural and vice versa.

1.3  Unless the context otherwise requires, reference to a recital, article,
     paragraph, provision, clause or schedule is to a recital, article,
     paragraph, provision, clause or schedule of or to this Agreement.

1.4  Reference to a statute or statutory provision includes a reference to it as
     from time to time amended, extended or re-enacted.

1.5  The headings in this Agreement are inserted for convenience only and do not
     affect its construction.

1.6  Unless the context or subject otherwise requires, references to words in
     one gender include references to the other genders.

1.7  References to "include" or "including" shall be construed as examples only,
     and in no way be read as limiting.

                                   CLAUSE 2

                        REPRESENTATIONS AND WARRANTIES

2.1  Each of Elan, Endorex and the Company hereby represents and warrants to the
     other that the Shares acquired or to be acquired by it in the Company will
     be acquired for its own absolute beneficial ownership and not on behalf of
     any other Person.

2.2  Each of Elan, Endorex and the Company hereby represents and warrants to the
     other that:

     (i)   it is duly incorporated under the laws of its place of incorporation;

     (ii)  it has full authority and capacity to enter into and perform its
           obligations under this Agreement (having obtained all requisite
           corporate and governmental approvals);

     (iii) it is not engaged in any litigation or arbitration, or in any
           dispute or controversy reasonably likely to lead to litigation,
           arbitration or any other proceeding, which would materially affect
           the validity of this Agreement, the Party's fulfillment of its
           respective obligations under this Agreement or the business of the
           Company as contemplated herein; and

     (iv)  this Agreement has been fully authorised, executed and delivered by
           it and it has full legal right, power and authority to enter into and
           perform this Agreement, which constitutes a valid and binding
           agreement between the Parties.

                                       7
<PAGE>
 
                                    CLAUSE 3

                     DIRECTION OF RESEARCH AND DEVELOPMENT

3.1  The Directors shall appoint a management committee (the "MANAGEMENT
     COMMITTEE") to perform certain operational functions, such delegation to be
     consistent with the Directors' right to delegate powers pursuant to the
     Company's Certificate of Incorporation or equivalent certificate or
     document under applicable laws of the Company's country of incorporation.
     The Management Committee shall initially consist of four members, two of
     whom shall be nominated by the Elan Director and two of whom shall be
     nominated by the Endorex Director, and each of whom shall be entitled to
     one vote, whether or not present at any Management Committee meeting during
     which such operational functions are discussed. Each of the Elan Director
     and the Endorex Director shall be entitled to remove any of their nominees
     to the Management Committee and appoint a replacement in place of any
     nominees so removed. The number of members of the Management Committee may
     be altered if agreed to by the Directors; provided that at all times during
     the term of this Agreement, each of the Elan Director and the Endorex
     Director shall be entitled to appoint an equal number of members to the
     Management Committee.

3.2  The Management Committee shall appoint a research and development committee
     (the "R&D Committee"). The R&D Committee shall initially consist of four
     members, with an equal number being nominated by the nominees of the Elan
     Director on the Management Committee and by the nominees of the Endorex
     Director on the Management Committee, and each of whom shall have one vote,
     whether or not present at an R&D Committee meeting during which research
     and development issues are discussed. The nominees of the Elan Director or
     the nominees of the Endorex Director shall be entitled to remove any of
     their nominees to the R&D Committee and appoint a replacement in place of
     any nominees so removed. The number of members of the R&D Committee may be
     altered if agreed to by the Management Committee; provided, that at all
     times during the term of this Agreement an equal number of members shall be
     nominated by the nominees of the Elan Director and by the nominees of the
     Endorex Director.

3.3  The Management Committee shall be responsible for, inter alia, devising,
     implementing and reviewing strategy for the Business and, in particular,
     devising the Company's strategy for research and development in relation to
     the Field and to monitor and supervise the implementation of the Company's
     strategy for research and development.

3.4  The Management Committee shall report all significant developments to the
     Directors on the occurrence thereof and, in addition, shall report at
     quarterly intervals to the Directors. Any dispute or deadlock among the
     members of the Management Committee shall be referred by it to the
     Directors.

3.5  The R&D Committee shall be responsible for the design of the Research and
     Development Program for consideration by the Management Committee and the
     implementation of the Research and Development Program as approved by the

                                       8
<PAGE>
 
     Management Committee. The R&D Committee shall meet at regular intervals to
     monitor the progress of the Research and Development Program and to report
     on their progress to the Management Committee.

                                   CLAUSE 4

                      CONDUCT OF RESEARCH AND DEVELOPMENT

4.1  For a period commencing on the date hereof and expiring on 31st December,
     1999, as described in the Company Subscription Agreement, each of Elan and
     Endorex shall undertake to perform research and development related to the
     development and commercialization of the Elan Royalty Products in an amount
     up to a maximum of [****] at the request of the Company and as articulated
     in the Plan in furtherance of the development and commercialization of the
     Elan Royalty Products and cultivation of Patent Rights and Know-How related
     to the Elan Royalty Products, and the Company Technology. The cost of such
     development work shall be the applicable Party's respective Cost plus
     [****]. All subcontracted services by third parties shall be charged at
     cost.

4.2  Research and development work related to Elan Royalty Products, the Third
     Party Technology or the Company Technology, including, without limitation,
     formulation, optimization, clinical and regulatory activities shall be
     conducted by Elan and Endorex as provided in the Plan. Research and
     development activities related primarily to the Elan Technology shall be
     conducted by Elan. Nothing in this Clause 4.2. shall be deemed [****] in
     the event that [****].

4.3  With reference to Clause 3 of the License Agreement, in the event that
     notwithstanding its reasonable endeavours, the Company [****] Elan and
     Endorex shall [****]. The selection of the Substitute Compound [****].

4.4  Each of Elan and Endorex (each, a "PROVIDING PARTY") shall use its
     reasonable endeavours to conduct its portion of the Research and
     Development Program in accordance with the timetable set out in the
     Research and Development Program. The research and development work
     conducted by the Providing Party for the Company shall be in accordance
     with the Research and Development Program devised by the R&D Committee as
     approved by the Management Committee. The Providing Party shall, in
     accordance with the terms and conditions set forth in this Agreement,
     undertake reasonably diligent efforts, as would be deemed commensurate with
     the achievement of its own business aims for a similar product of its own,
     to conduct its part of the Research and Development Program.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       9
<PAGE>
 
4.5  The Research and Development Program(s) shall be directed by the R&D
     Committee, subject to the strategic direction of the Management Committee.
     In conducting the Research and Development Program(s), the Providing Party
     shall co-operate fully with the R&D Committee and the Management Committee.
     Each Providing Party shall maintain the facilities used by it for the
     performance of the Research and Development Program in compliance with the
     applicable requirements of the RHA's, including GMP and GLP standards.

4.6  The Company may evaluate the reports and other data furnished by the
     Providing Party for the purpose, inter alia, of deciding whether or not to
     proceed with all or part of the applicable Research and Development
     Program.

4.7  Elan, Endorex and the Company shall agree on a budget in connection with
     the activities to be undertaken during the Research and Development
     Program, which budget shall form part of the Research and Development
     Program. In the event that as a result of additional activities to be
     undertaken by the Providing Party at the request of the Company the budget
     needs to be revised, Elan, Endorex and the Company will agree on such
     revision prior to the Providing Party commencing any such additional
     development activities.

4.8  The Providing Party will keep accurate records consistent with its normal
     business practices of the efforts expended by it under the Research and
     Development Program for which it is charging the Company, which will
     include the time spent by each person working on the Research and
     Development Program.

4.9  [****] the Providing Party shall permit the Company or its duly authorized
     representative on reasonable notice and at any reasonable time during
     normal business hours to have access to inspect and audit the accounts and
     records of the Providing Party and any other book, record, voucher, receipt
     or invoice relating to the calculation or the Cost of the Research and
     Development Program or, where applicable, for the supply of the Elan
     Royalty Products and to the accuracy of the reports which accompanied them.
     Any such inspection of the Providing Party's records shall be at the
     expense of the Company, except that if any such inspection reveals an
     overpayment in the amount of the Costs paid to the Providing Party for the
     Research and Development Program in any calendar quarter of [****] or more
     of the amount of the Costs actually due to the Providing Party hereunder,
     then the expense of such inspection shall be borne solely by the Providing
     Party instead of by the Company. Any surplus over the Costs properly
     payable by the Company to the Providing Party shall be paid promptly to the
     Company. If such inspection reveals a deficit in the amount of the Costs
     properly payable to the Providing Party by the Company, the Company shall
     pay the deficit to the Providing Party.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       10
<PAGE>
 
4.10 Subject to the provisions of Clause 4.1, the Company shall pay the
     Providing Party for any research and development work carried out by them
     on behalf of the Company at the termination of each stage of the Research
     and Development Program, subject to the proper invoicing of research and
     development work and expenses.

                                   CLAUSE 5

                             REGULATORY APPROVALS

5.1  During the relevant regulatory procedure, the Company shall keep the other
     Parties promptly and fully advised of the relevant regulatory activities,
     progress and procedures. The Company shall inform the other Parties of any
     dealings it shall have with an RHA, and shall furnish the other Parties
     with copies of all correspondence. The Parties shall collaborate in
     relation to obtaining the approval of the RHA's for final approved
     labelling.

5.2  The Company shall, at its own cost, file, prosecute and maintain any and
     all Regulatory Applications specifically related to the Third Party
     Technology, the Company Technology and the Elan Royalty Products but not
     the Medipad System itself and all Regulatory Approvals specifically related
     to the Third Party Technology, the Company Technology and the Elan Royalty
     Products shall remain the property of the Company; provided, that the
     Company shall allow the other Parties access thereto to enable those
     Parties to fulfill their obligations and exercise their rights under this
     Agreement, and the License Agreement. The Company shall diligently pursue
     all regulatory activities described in this Clause 5.2.

5.3  The costs and expenses of any filings and proceedings made by the Company
     to the RHA's, including post approval studies required by the RHA's in
     respect of an Elan Royalty Product, and to maintain the RHA's approval
     hereunder shall be paid by the Company.

5.4  It is hereby acknowledged that there are inherent uncertainties involved in
     the registration of pharmaceutical products with the RHA's insofar as
     obtaining approval is concerned and such uncertainties form part of the
     business risk involved in undertaking the form of commercial collaboration
     as set forth in this Agreement. Therefore, except for using its reasonable
     efforts, neither Elan nor Endorex shall have any liability to the Company
     solely as a result of any failure of an Elan Royalty Product to achieve the
     approval of any RHA.

5.5  Elan shall, at its own cost, file, prosecute, maintain any and all
     Regulatory Applications specifically related to the Medipad System and the
     Elan Technology and all Regulatory Approvals specifically related to the
     Elan Technology shall remain the property of Elan; provided, that Elan
     shall allow the other Parties access thereto and the use thereof to enable
     those Parties to fulfil their obligations and exercise their rights under
     this Agreement, and the License Agreement.

                                       11
<PAGE>
 
                                   CLAUSE 6

                     PROPERTY OWNERSHIP RIGHTS/COMPETITION

The Parties acknowledge and agree to be bound by:

6.1  the provisions of Clause 5 of the License Agreement outlining the agreement
     between the parties thereto in relation to Intellectual Property Rights;
     and

6.2  the provisions of Clause 5 of the License Agreement outlining the agreement
     between the parties thereto in relation to competition.

                                   CLAUSE 7

                                 PATENT RIGHTS

7.1  The rights and obligations of the Elan and the Company in respect of any
     Patents claiming the Technologies are governed by the provisions of the
     License Agreement.

                                   CLAUSE 8

                                   EQUIPMENT

8.1  Any equipment or other assets purchased by Endorex and/or Elan which are
     funded by the Company shall belong to the Company. In the event that such
     equipment or assets are purchased, the Parties shall conclude the
     appropriate arrangements as regards insurance and bailment provisions.

                                   CLAUSE 9

                           EXPLOITATION OF PRODUCTS

9.1  The Company will have [****] any Elan Royalty Products subject to the other
     terms of this Agreement. [****]. It may be necessary to file a Regulatory
     Application and perform clinical testing in more than one country. The
     conduct of such clinical trials and the obtaining of Regulatory Approvals
     shall be regulated in accordance with arrangements agreed upon by the
     Management Committee.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       12
<PAGE>
 
9.2  The Management Committee shall review the Research and Development Program
     on a regular basis to decide, inter alia, whether such Research and
     Development Program should continue, be terminated, continue as modified or
     whether the Parties should commence a new Research And Development Program.
     Any Party may call upon the Management Committee of the Company to review
     termination of the Research and Development Program for an Elan Royalty
     Product.

9.3  The strategy for the registration and the commercialization of the Elan
     Royalty Products shall be determined by the Management Committee.

                                   CLAUSE 10

                       TECHNICAL SERVICES AND ASSISTANCE

10.1 Whenever commercially and technically feasible, the Company shall contract
     with Endorex or Elan, as the case may be, to perform such other services as
     the Company may require, other than those specifically dealt with in the
     Elan License Agreement and in Clause 4. In determining which Party should
     provide such services, the Management Committee shall take into account the
     respective infrastructure, experience and Cost of Elan, and Endorex.
     Nothing in this Clause 10.1 shall be deemed to prohibit the Company from
     contracting such required services from an Independent Third Party in the
     event that [****].

10.2 The Company shall, if appropriate, conclude an administrative support
     agreement with Elan and Endorex on such terms as the parties thereto shall
     in good faith negotiate. The management services required include, but are
     not limited to, one or more of the following management services which
     shall be requested by the Company: 

     (i)   accounting, financial and other services;

     (ii)  tax services;

     (iii) insurance services;

     (iv)  human resources services;

     (v)   legal and company secretarial services;

     (vi)  patent and related intellectual property services; and

     (vii) all such other services consistent with and of the same type as those
           services to be provided pursuant to this Agreement, as may be
           required.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       13
<PAGE>
 
10.3 If Elan or Endorex so requires, Endorex or Elan, as the case may be, shall
     receive, at times and for periods mutually acceptable to the parties,
     employees of the other party (such employees to be acceptable to the
     receiving party in the matter of qualification and competence) for
     instruction in respect of the Elan Technology or the Company Technology, as
     the case may be, as is necessary to further the Research and Development
     Programs.

10.4 The employees received by Elan or Endorex, as the case may be, shall be
     subject to obligations of confidentiality no less stringent than those set
     out in Clause 17 and such employees shall observe the rules, regulations
     and systems adopted by the Party receiving the said employees for its own
     employees or visitors.

                                   CLAUSE 11

                              SUPPLY ARRANGEMENTS

11.1 Elan shall supply, or procure the supply of, Elan Royalty Products to the
     Company at [****]. In advance of the first launch of an Elan Royalty
     Product, the Parties shall negotiate in good faith a supply agreement on
     pharmaceutical industry standard terms, including provisions as to product
     quality and supply.

                                   CLAUSE 12

                     PROCEEDINGS OF DIRECTORS AND CHAIRMAN

12.1 As described in the Company Subscription Agreement, the board of directors
     of the Company shall consist of five members as follows: one Elan Director
     and four Endorex Directors. In the event that Elan shall exercise the
     Exchange Right, the board of directors shall be altered so that the number
     of shall consist of four members as follows: two Elan Directors and two
     Endorex Directors.

12.2 As of the date hereof and until Elan exercises its Exchange Right, an
     Endorex Director shall be the chairman of the Company's board of directors.

12.3 The Chairman appointed under Clause 12.2 shall retire once Elan exercises
     its Exchange Right. Thereafter:

     (i)  each Participant, beginning with Elan, shall have the right,
          exercisable alternatively, of nominating one of the Directors to be
          Chairman of the Company for a period of one year;

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       14
<PAGE>
 
     (ii)   the Chairman shall hold office until the termination of the next
            Annual Meeting following his appointment;

     (iii)  if the Chairman is unable to attend any meeting of the board, the
            Director of the same designation shall act as Chairman in his place
            at the meeting.

                                   CLAUSE 13

                   MATTERS REQUIRING PARTICIPANTS' APPROVAL

13.1  In consideration of Elan agreeing to enter into the License Agreement, the
      Parties hereby agree that neither the Company nor any Subsidiary of the
      Company shall, without the prior approval of each of the Participants:

     (i)    engage in any activity other than the Business;

     (ii)   acquire or dispose of assets of a value in excess of [****] or sell
            the principal assets, undertaking or Business of the Company;

     (iii)  borrow any sum (except from the Company's bankers in the ordinary
            and proper course of the Business) in excess of a maximum aggregate
            sum outstanding at any time of [****].

     (iv)   make any loan or advance or give any credit (other than normal trade
            credit) in excess of [****] to any Person;

     (v)    give any guarantee or indemnity to secure the liabilities or
            obligations of any Party other than those which it is usual to give
            in the ordinary course of a business similar to the Business;

     (vi)   enter into any contract, arrangement or commitment involving
            expenditure on capital account or the realization of capital assets
            if the amount or the aggregate amount of such expenditure or
            realisation by the Company and all of the Subsidiaries of the
            Company would exceed [****] in any one year or in relation to any
            one project, and for the purpose of this paragraph the aggregate
            amount payable under any agreement for hire, hire purchase or
            purchase on credit sale or conditional sale terms shall be deemed to
            be capital expenditure incurred in the year in which such agreement
            is entered into;

     (vii)  issue any unissued Shares or create or issue any new shares, or
            alter any rights attaching to the Company's capital stock;

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       15
<PAGE>
 
     (viii)  create, acquire or dispose of any Subsidiary or of any shares in
             any Subsidiary;

     (ix)    enter into any partnership or profit sharing agreement with any
             Person other than arrangements with trade representatives and
             similar Persons in the ordinary course of business;

     (x)     issue any debentures or other securities convertible into shares or
             debentures or any share warrants or any options in respect of
             Shares;

     (xi)    acquire, purchase or subscribe for any shares, debentures,
             mortgages or securities (or any interest therein) in any company,
             trust or other Person;

     (xii)   adopt any employee benefit program or incentive schemes;

     (xiii)  engage any new employee of the Company at remuneration which could
             exceed the rate of [****] per annum;

     (xiv)   pay any remuneration to Directors by virtue of holding such office;

     (xv)    licence or sub-licence any of the Elan Technology or the Company
             Technology;

     (xvi)   amend or vary the terms of the Licence Agreement;

     (xvii)  undertake a Research and Development Program;

     (xviii) file an amendment to the Company's certificate of incorporation or
             alter the by-laws or equivalent certificate or documents under
             applicable laws of the Company's country of incorporation;

     (xix)   alter the number of the Company's directors;

     (xx)    any actions of the Company in relation to the acquisition of the
             Third Party Technology or the nomination of the Substitute Compound
             under Clause 3 of the License Agreement;

     (xxi)   pay dividends or distributions in respect of, or redeem or
             repurchase, the equity of the Company; or

     (xxii)  amend or vary the terms of the Plan.



_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       16
<PAGE>
 
                                   CLAUSE 14

                         THE BUSINESS PLAN AND REVIEWS

14.1  The Directors shall meet as soon as reasonably practicable after the date
      hereof and in any event within 90 days of signing this Agreement, to agree
      and approve the Business Plan and operating budget for the initial
      Financial Year. Thereafter the Directors shall reach agreement on each
      subsequent Financial Year operating budget at least 30 days prior to the
      commencement of each respective Financial Year.

14.2  The Participants agree that the Management Committee shall submit to the
      Directors, on 15th February, 15th May, 15th August and 15th November, or
      as soon as reasonably practicable thereafter in each Financial Year, a
      report on the performance of the business activities of the Company and
      the Directors shall hold such meeting as may be necessary to review the
      performance of the Company against the Plan for the relevant year of
      trading.

                                   CLAUSE 15

                                   DISPUTES

15.1  Disputes among the members of the R&D Committee in connection with the
      Licence Agreement (each such event, a "COMMITTEE DISPUTE") which cannot be
      resolved by consensus shall be forwarded to the Management Committee for
      discussion and resolution, by filing of a notice of dispute from the R&D
      Committee to the Management Committee.

15.2  In the event that the members of the Management Committee, after
      reasonable consideration, cannot resolve a Committee Dispute within 10
      days of receipt of a notice as described in Clause 15.1, such Committee
      Dispute shall be forwarded to a designated senior officer of each of Elan
      and Endorex and thereafter to the board of directors for discussion and
      resolution, by submission of a letter from the Management Committee to the
      Chairman of the board of directors detailing the issue in dispute and the
      position of each party in relation thereto.

15.3  Disputes under this Agreement among members of the Management Committee
      (each such event a "MANAGEMENT DISPUTE"; together with a Committee
      Dispute, a "DISPUTE"), which cannot be resolved by consensus shall also be
      forwarded to the board of directors for discussion and resolution, by
      submission of a letter from the Management Committee to the Chairman of
      the board of directors detailing the issue in dispute and the position of
      each party in relation thereto.

15.4  In the event of submission of a letter accordance with Clause 15.2 or
      15.3, the members of the board of directors shall convene in person or via
      telephone conference within 10 days in order to discuss the Dispute. After
      discussion and consideration, resolution of the Dispute shall be decided
      by a majority vote of the board of directors.

                                       17
<PAGE>
 
15.5  In the event that the board is unable to resolve a Dispute, the Chairman
      shall refer the matter to an expert (the "EXPERT"), mutually acceptable to
      the Parties; or in the event that the Parties cannot so agree, a Panel (as
      defined below) in accordance with the procedures for such Panel as set
      forth below in Clause 15.9 below. In each case, the Expert shall be
      selected having regard to his suitability to determine the particular
      dispute or difference on which he is being requested to determine. The
      Expert shall afford each Party a reasonable opportunity, in writing or
      orally, to state its respective reasons in support of such contentions as
      each Party may wish to make relative to the matters under consideration.
      The Expert shall give notice in writing of his determination to the
      Parties within such time as may be stipulated in his terms of appointment,
      or in the absence of such stipulation as soon as practicable, but in any
      event within three weeks from the reference of the Committee Dispute to
      him.

15.6  The fees of each Expert shall be shared equally between the Parties. The
      Expert shall be entitled to inspect and examine all documentation and any
      other material which he may consider to be relevant to the Dispute.

15.7  Any determination by the Expert shall not be final and binding on the
      Parties.

15.8  In no event shall the referral of a Dispute to the Expert supercede the
      provisions of Clause 13 of this Agreement, that both the Elan Director(s)
      and Endorex Directors, and where applicable the Participants, approve
      certain business decisions.

15.9  In the event that the board of directors is unable to agree upon an
      Expert, a panel of experts (the "PANEL") shall be appointed as follows.
      Each of the Elan Director and the Endorex Director shall each select one
      Expert, each in their sole discretion, using good faith to select an
      Expert with appropriate qualifications. Within 20 days of the appointment
      of such Experts, the two Experts so selected shall appoint a third Expert
      from a list of arbitrators provided by the American Arbitration
      Association (the "AAA"); provided, that in the event that the two selected
      Experts are unable to agree upon such third Expert within 20 days, any
      director of the Company may request the AAA to appoint such third Expert.

15.10 Notwithstanding Clause 15.9, each of the Elan Director and the Endorex
      Director shall be prohibited from selecting as an Expert any person who
      has or has had a material interest or relationship (i.e., through
      employment, stock ownership, business affiliation or otherwise) with a
      Party or any of its directors, officers or employees. Service as an Expert
      hereunder shall not constitute such a material interest or relationship in
      connection with the resolution of subsequent Disputes.

                                   CLAUSE 16

                                  TERMINATION

16.1  The Company shall continue to operate and exist for so long as its
      stockholders shall determine, and this Agreement and the Company
      Subscription Agreement shall govern

                                       18
<PAGE>
 
      such operation and existence until this Agreement shall be terminated in
      accordance with this Clause 16 (the "TERM").

16.2  For the purpose of this Clause 16, a "RELEVANT EVENT" is committed by Elan
      or Endorex if:

      (i)   it commits a material breach of one of its material obligations
            under this Agreement and fails to remedy such breach within 60 days
            of being specifically required in writing to do so by the other
            Participant; provided, however, that if the breaching Participant
            has proposed a course of action to rectify the breach and is acting
            in good faith and with due diligence to rectify same but has not
            cured the breach by the 60th day, such rectifying period shall be
            extended by an amount of time as is reasonably necessary to permit
            the breach to be rectified;

      (ii)  it ceases, wholly or substantially, to carry on its business, other
            than for the purpose of a reorganization, without the prior written
            consent of Elan in the case of Company, or Company in the case of
            Elan (such consent not to be unreasonably withheld);

      (iii) the voluntary appointment of a liquidator, receiver, administrator,
            examiner, trustee or similar officer over all or substantially all
            of its assets under the laws of its state or country of
            incorporation;

      (iv)  an application or petition for bankruptcy, corporate reorganization,
            composition, administration, examination, arrangement or any other
            procedure similar to any of the foregoing under the laws of its
            state or country of incorporation, is filed, and is not discharged
            within 90 days.

16.2  If either Participant commits a Relevant Event, the other Participant
      shall have in addition to all other legal and equitable rights and
      remedies hereunder, the right to terminate this Agreement upon 30 days'
      written notice; provided, that such written notice be given within 60 days
      following the date that the other Participant becomes aware of the
      Relevant Event.

16.3  In the event that a [****] shall, directly or indirectly, [****]or
      otherwise [****] shall be entitled to forthwith [****] to [****].

16.4  If, at any time, the Participants agree that the Company should be wound
      up or liquidated, the Parties shall ensure that, after all of the debts of
      the Company have been satisfied, the assets of the Company shall be
      distributed, in specie in accordance with the Participants' ownership
      interest in the Company and/or as the Parties further agree to negotiate
      in good faith, the terms for other arrangements, including cross licences,
      as may be necessary to enable Endorex and Elan to exploit the Company
      Technology for the Field.

_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       19
<PAGE>
 
                                   CLAUSE 17

                                CONFIDENTIALITY

17.1  Each of the Parties acknowledge that it may be necessary, from time to
      time, to disclose to one another confidential and proprietary information,
      including without limitation, inventions, the Technologies, improvements
      and the patents relating thereto, works of authorship, trade secrets,
      specifications, designs, data, know-how and other information, relating to
      the Field, the terms of the various agreements between the Parties, the
      Elan Royalty Products, processes, and services, of the disclosing Party
      ("CONFIDENTIAL INFORMATION").

Confidential Information shall not be deemed to include:

      (i)   information that is in the public domain;

      (ii)  information which is made public by the disclosing Party;

      (iii) information which is independently developed by a Party without the
            aid or application of the Confidential Information;

      (iv)  information that is published or otherwise becomes part of the
            public domain without any disclosure by a Party, or on the part of a
            Participant's directors, officers, agents, representatives or
            employees;

      (v)   information that becomes available to a Party on a non-confidential
            basis, whether directly or indirectly, from a source other than
            another Party, which source, to the best of the receiving Party's
            knowledge, did not acquire this information on a confidential basis;
            or

      (vi)  information which the receiving Party is required to disclose
            pursuant to:

            (A)   a valid order of a court or other governmental body or any
                  political subdivision thereof or otherwise required by law; or

            (B)   other applicable law or judicial or administrative process;
                  provided that if the receiving Party becomes legally required
                  to disclose any confidential information, the receiving Party
                  shall give the disclosing Party prompt notice of such fact so
                  that the disclosing Party may obtain a protective order or
                  other appropriate remedy concerning any such disclosure. The
                  receiving Party shall fully co-operate with the disclosing
                  Party in connection with the disclosing Party's efforts to
                  obtain any such order or other remedy. If any such order or
                  other remedy does not fully preclude disclosure, the receiving
                  Party shall make such disclosure only to the extent that such
                  disclosure is legally required.

                                       20
<PAGE>
 
17.2  Any Confidential Information revealed by a Party to another Party shall be
      used by the receiving Party exclusively for the purpose of fulfilling the
      receiving Party's obligations under this Agreement and for no other
      purpose.

17.3  Each of the Parties agrees to disclose Confidential Information of another
      Party only to those employees, representatives and agents requiring
      knowledge thereof in connection with their duties directly related to the
      fulfilling of the Party's obligations under this Agreement. Each of the
      Parties further agrees to inform all such employees, representatives and
      agents of the terms and provisions of this Agreement and their duties
      hereunder and to obtain their consent hereto as a condition of receiving
      Confidential Information. Each of the Parties agrees that it will exercise
      the same degree of care, but in no event less than a reasonable degree,
      and protection to preserve the proprietary and confidential nature of the
      Confidential Information disclosed by a Participant, as the receiving
      Party would exercise to preserve its own proprietary and confidential
      information. Each of the Parties agrees that it will, upon request of a
      Party, return all documents and any copies thereof containing Confidential
      Information belonging to or disclosed by, such Party.

17.4  Notwithstanding the above, each Party may use or disclose Confidential
      Information disclosed to it by another Party to the extent such use or
      disclosure is reasonably necessary in filing or prosecuting patent
      applications, prosecuting or defending litigation, complying with patent
      applications, prosecuting or defending litigation, complying with
      applicable governmental regulations or otherwise submitting information to
      tax or other governmental authorities, conducting clinical trials, or
      making a permitted sub-license or otherwise exercising rights hereunder;
      provided, that if a Party is required to make any such disclosure of
      another Party's confidential information, other than pursuant to a
      confidentiality agreement, such disclosing Party shall inform the other
      Party thereof, and allow such other Party to participate in the disclosure
      process for the purpose of generally limiting, to the extent possible,
      such disclosure.

17.5  The provisions relating to confidentiality in this Clause 17 shall remain
      in effect during the Term, and for a period of [****] following the
      expiration or earlier termination of this Agreement.



_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       21
<PAGE>
 
17.6  The Parties agree that the obligations of this Clause 17 are necessary and
      reasonable in order to protect the Parties' respective businesses, and
      each Party expressly agrees that monetary damages may be inadequate to
      compensate a Party for any breach by another Party of its covenants and
      agreements set forth herein. Accordingly, the Parties agree and
      acknowledge that any such violation or threatened violation may cause
      irreparable injury to a Party and that, in addition to any other remedies
      that may be available, in law and equity or otherwise, a Party shall be
      entitled to seek injunctive relief against the threatened breach of the
      provisions of this Clause 17, or a continuation of any such breach by
      another Party, specific performance and other equitable relief to redress
      such breach together with its damages and reasonable counsel fees and
      expenses to enforce its rights hereunder, without the necessity of proving
      actual or express damages.

                                   CLAUSE 18

                             PARTICIPANTS' CONSENT

18.1  Where this Agreement provides that any particular transaction or matter
      requires the consent, approval or agreement of any Participant, such
      consent, approval or agreement may be given subject to such terms and
      conditions as that Participant may impose and to which the other
      Participant shall agree and any breach of such terms and conditions by any
      Persons subject thereto shall ipso facto be deemed to be a breach of the
      terms of this Agreement.

                                   CLAUSE 19

                           PARTIES AND COMPANY BOUND

19.1  The Company undertakes with each of the Parties to be bound by and comply
      with the terms and conditions of this Agreement insofar as the same relate
      to the Company.

19.2  Each Party undertakes with the others to exercise its part in relation to
      the Company so as to ensure that the Company fully and promptly observes,
      performs and complies with its obligations under this Agreement.

                                   CLAUSE 20

                                     COSTS

20.1  Each Party shall bear its own legal and other costs incurred in relation
      to preparing and concluding this Agreement and the related agreements and
      other documents.

20.2  All costs, legal fees, registration fees and other expenses, including the
      costs and expenses incurred in relation to the incorporation of the
      Company, shall be borne by the Company.

                                       22
<PAGE>
 
                                   CLAUSE 21

                                    GENERAL

21.1  GOOD FAITH

      Each of the Parties hereto undertakes with the others to do all things
      reasonably within its power which are necessary or desirable to give
      effect to the spirit and intent of this Agreement.

21.2  FURTHER ASSURANCE

      The Parties hereto shall use their respective reasonable efforts to
      procure that any necessary third party shall do, execute and perform all
      such further deeds, documents, assurances, acts and things as any of the
      Parties hereto may reasonably require by notice in writing to the others
      to carry the provisions of this Agreement into full force and effect;
      including, without limitation, the execution of any documents required to
      ensure the assignment of the Technologies, as described in Clause 6.1. In
      addition, each of Elan and Endorex shall cooperate and make reasonably
      available to the Company (including its authorized agents and
      representatives) all assistance reasonably necessary or appropriate to
      enable the Company to prepare, file, prosecute and maintain Patents or
      other intellectual property rights related to the Technologies, throughout
      the Territory.

21.3  NO REPRESENTATION

      Each of the Parties hereto hereby acknowledges that in entering into this
      Agreement it has not relied on any representation or warranty save as
      expressly set out herein or in any document referred to herein.

21.4  EXERCISE OF POWERS

      Where either Participant is required under this Agreement to exercise its
      powers in relation to the Company to procure a particular matter or thing,
      such obligation shall be deemed to include an obligation to exercise its
      powers both as a Participant and as a Director (where applicable) of the
      Company and to procure that any Director appointed by it (whether alone or
      jointly with any other Person) shall procure such matter or thing.

21.5  FORCE MAJEURE

      Neither Party to this Agreement shall be liable for delay in the
      performance of any of its obligations hereunder if such delay results from
      causes beyond its reasonable control, including, without limitation, acts
      of God, fires, strikes, acts of war, or intervention of any relevant
      government authority, but any such delay or failure shall be remedied by
      such Party as soon as practicable.

                                       23
<PAGE>
 
21.6  RELATIONSHIP OF THE PARTICIPANTS

      Nothing contained in this Agreement is intended or is to be construed to
      constitute Elan and Endorex as partners, or Elan as an employee of
      Endorex, or Endorex as an employee of Elan. No Party hereto shall have any
      express or implied right or authority to assume or create any obligations
      on behalf of or in the name of another Party or to bind another Party to
      any contract, agreement or undertaking with any third party.

21.7  COUNTERPARTS

      This Agreement may be executed in any number of counterparts, each of
      which when so executed shall be deemed to be an original and all of which
      when taken together shall constitute this Agreement.

21.8  NOTICES

      Any notice to be given under this Agreement shall be sent in writing in
      English by registered mail, airmail, reputable courier or recorded
      delivery post, or telecopied to:

if to Elan:              Elan Corporation, plc                       
                         Lincoln House                               
                         Lincoln Place                               
                         Dublin 2,                                   
                         Ireland                                     
                         Attention: Vice President & General Counsel 
                         Elan Pharmaceutical Technologies            
                         Fax; 353 1 662 4960                          


with a copy to:          Brock Silverstein McAuliffe LLC
                         153 East 53rd Street     
                         56th Floor               
                         New York, New York  10022
                         Attention: David Robbins 
                         Fax 1 212 371 5500        

IF TO ENDOREX:           Endorex Corp.
                         900 North Shore Drive     
                         Lake Buff, Illinois  60044
                         Attention:  President     
                         Fax 1 847 604 8570         

                                       24
<PAGE>
 
with a copy to:

                         Brobeck, Phleger & Harrison LLP    
                         1633 Broadway                      
                         47th Floor                         
                         New York, New York  10019          
                         Attention: Nigel Howard            
                         Fax 1 212 586 7878                  

- -IF TO THE COMPANY:      Clarendon House
                         2 Church Street
                         Hamilton       
                         Bermuda         

                         Attention:  President and Chairman
                         Fax 1 441 292 4720

      with a copy to:

                         Brobeck, Phleger & Harrison LLP    
                         1633 Broadway                      
                         47th Floor                         
                         New York, New York  10019          
                         Attention: Nigel Howard            
                         Fax 1 212 586 7878                  

      with a copy to counsel to each of Elan and Endorex at the respective
      addresses listed above, with a copy to the non-notifying Parties; or to
      such other address(es) as may from time to time be notified by any Party
      to the others hereunder.

      Any notice sent by mail shall be deemed to have been delivered within
      seven working days after dispatch and any notice sent by reputable courier
      shall be deemed to have been delivered within 24 hours of the time of the
      dispatch. Notices of change of address shall be effective upon receipt.

21.9  GOVERNING LAW AND DISPUTES

      This Agreement shall be governed by and construed in accordance with the
      laws of the State of New York, without giving effect to the principles
      thereof relating to conflict of laws. The Parties agree to submit to the
      jurisdiction of the courts of New York for the resolution of disputes
      hereunder, which the Parties have not otherwise agreed should be subject
      to the binding determination of an Expert or Panel, pursuant to the terms
      of this Agreement.

21.10 SEVERABILITY

      If any provision in this Agreement is agreed by the Parties to be, deemed
      to be or becomes invalid, illegal, void or unenforceable under any law
      that is applicable hereto, (i) 

                                       25
<PAGE>
 
      such provision will be deemed amended to conform to applicable laws so as
      to be valid and enforceable or, if it cannot be so amended without
      materially altering the intention of the Parties, it will be deleted, with
      effect from the date of such agreement or such earlier date as the Parties
      may agree, and (ii) the validity, legality and enforceability of the
      remaining provisions of this Agreement shall not be impaired or affected
      in any way.

21.11 AMENDMENTS

      No amendment, modification or addition hereto shall be effective or
      binding on any Party unless set forth in writing and executed by a duly
      authorised representative of all Parties.

21.12 WAIVER

      No waiver of any right under this Agreement shall be deemed effective
      unless contained in a written document signed by the Party charged with
      such waiver, and no waiver of any breach or failure to perform shall be
      deemed to be a waiver of any future breach or failure to perform or of any
      other right arising under this Agreement.

21.13 ASSIGNMENT

      This Agreement may not be assigned by any Party without the prior written
      consent of the other, which consent in relation to the proposed assignment
      to an Affiliate of a Party shall not be unreasonably withheld, conditioned
      or delayed.

21.14 NO EFFECT ON OTHER AGREEMENTS

      No provision of this Agreement shall be construed so as to negate, modify
      or affect in any way the provisions of any other agreement between any of
      the Parties unless specifically referred to, and solely to the extent
      provided, in any such other agreement.  In the event of a conflict between
      the provisions of this Agreement and the provisions of the License
      Agreements or the Company Subscription Agreement, the terms of this
      Agreement shall prevail.

21.15 SUCCESSORS

      This Agreement shall be binding upon and enure to the benefit of the
      Parties hereto, their successors and permitted assigns.

                                       26
<PAGE>
 
IN WITNESS THEREOF the Parties hereto have executed this Joint Development and
Operating Agreement in quadruplicate.


SIGNED BY
For and on behalf of
ELAN CORPORATION, PLC


/s/ Liam Daniel

SIGNED BY
FOR AND ON BEHALF OF
ELAN INTERNATIONAL SERVICES, LTD.


/s/ Liam Daniel

SIGNED BY
For and on behalf of
ENDOREX CORPORATION


/s/ Michael S. Rosen
President and Chief Executive Officer

SIGNED BY
For and on behalf of
ENDOREX NEWCO, LTD.


/s/ Michael S. Rosen
Chairman

                                       27
<PAGE>
 
                                  SCHEDULE 1

                       TYPE II TECHNOLOGICAL COMPETITOR

[****]



_____________
[****]  REPRESENTS MATERIAL WHICH HAS BEEN REDACTED PURSUANT TO A REQUEST FOR
        CONFIDENTIAL TREATMENT PURSUANT TO RULE 24B-2 UNDER THE SECURITIES
        EXCHANGE ACT OF 1934, AS AMENDED.

                                       28

<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS FINANCIAL INFORMATION EXTRACTED FROM THE CONSOLIDATED
BALANCE SHEET AND THE CONSOLIDATED STATEMENTS OF OPERATION.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1998
<CASH>                                      14,103,207
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            15,787,354
<PP&E>                                         429,294
<DEPRECIATION>                                 916,110
<TOTAL-ASSETS>                              16,656,742
<CURRENT-LIABILITIES>                          687,984
<BONDS>                                              0
                                0
                                  8,448,905
<COMMON>                                        10,055
<OTHER-SE>                                   7,509,798
<TOTAL-LIABILITY-AND-EQUITY>                16,656,742
<SALES>                                              0
<TOTAL-REVENUES>                               629,962
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                            12,881,998
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              13,483
<INCOME-PRETAX>                           (12,265,520)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (12,265,520)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (12,265,520)
<EPS-PRIMARY>                                   (1.28)
<EPS-DILUTED>                                   (1.28)
        

</TABLE>

<PAGE>


Certain Factors that May Affect Future Results, Financial Condition and the
Market Price of Securities

     Need for Substantial Additional Funds. The Company had approximately $14.1
million of cash, cash equivalents and marketable securities at Sept. 30, 1998.
The Company may be required to seek additional financing in the future to
continue operations during such period in the event of cost overruns,
unanticipated expenses, a determination to pursue additional research projects,
or the failure to receive funds anticipated from other sources. The Company will
require substantial additional funds to finance its business activities on an
ongoing basis. The Company's actual future capital requirements will depend on
numerous factors, including, but not limited to, costs associated with
technologies and products which it may license from third parties, progress in
its research and development programs, including pre-clinical and clinical
trials, costs of filing and prosecuting patent applications and, if necessary,
enforcing issued patents or obtaining additional licenses to patents, competing
technological and market developments, the cost and timing of regulatory
approvals, the ability of the Company to establish collaborative relationships,
and the cost of establishing manufacturing, sales and marketing capabilities.
The Company has no current commitment to obtain other additional funds and is
unable to state the amount or potential source of any other additional funds.
Because of the Company's potential long-term capital requirements, it may
undertake additional equity offerings whenever conditions are favorable, even if
it does not have an immediate need for additional capital at that time.  There
can be no assurance that the Company will be able to obtain additional funding
when needed, or that such funding, if available, will be obtainable on
reasonable terms. Any such additional funding may result in significant dilution
to existing stockholders. If adequate funds are not available, the Company may
be required to accept unfavorable alternatives, including (i) the delay,
reduction or elimination of research and development programs, capital
expenditures, and marketing and other operating expenses, (ii) arrangements with
collaborative partners that may require the Company to relinquish material
rights to its products that it would not otherwise relinquish, or (iii) a merger
of the Company or a sale of the Company or its assets.

     Early Stage of Development. The Company is a development stage enterprise
and expects no significant revenue from the sale of products in the near future.
The Company's proprietary immunomodulator, ImmTher(R), has completed some Phase
II clinical trials for cancer with limited response in gross metastatic disease.
The Company initiated new randomized Phase II clinical trials for ImmTher(R) in
treating micro-metastasis in pediatric sarcomas with M.D. Anderson Cancer Center
in Houston and Memorial Sloan-Kettering Cancer Center in New York City.
ImmTher(R) recently received FDA Orphan drug designations for Ewings sarcoma and
osteosarcoma, the most prevalent bone cancers in children and young adults.
Additionally, the Company's second cancer drug, Perillyl alcohol ("POH") has
completed several Phase I trials as an anti-cancer drug at the University of
Wisconsin-Madison and with the Eastern Cooperative Oncology Group, and has
initiated three Phase II trials in breast, ovarian and prostate cancers, all
sponsored by the National Cancer Institute. Furthermore, the Company initiated
development of other monoterpene based cancer agents via a sponsored research
agreement with the University of Wisconsin-Madison. The Company's oral delivery
technology is in the pre-clinical development stage. As a result, the Company
must be evaluated in light of the problems, delays, uncertainties and
complications encountered in connection with early-stage biopharmaceutical
development. These risks include, but are not limited to, the possibilities that
any or all of the Company's potential products will be found to be ineffective
or toxic, or fail to receive necessary regulatory clearances in the United
States or abroad. To achieve profitable operations, the Company must
successfully develop, obtain regulatory approval for, introduce and successfully
market through a larger pharmaceutical partner, at a profit, products that are
currently in the research and development phase. The Company is currently not
profitable. No assurance can be given that the Company's research and
development efforts will be successful, that required regulatory approvals will
be obtained, that any of the Company's proposed products will be safe and
effective, that any such products, if developed and introduced, will be
successfully marketed or achieve market acceptance, or that such products can be
marketed at prices that will allow profitability to be achieved or sustained.
Failure of the Company to successfully develop, obtain regulatory approval for,
and introduce and market its products under development would have a material
adverse effect on the business, financial condition and results of operations of
the Company.
<PAGE>
 
     History of Losses; Uncertainty of Future Financial Results. The Company has
experienced significant operating losses since its inception, has a significant
accumulated deficit, and expects to incur losses for the next several years. The
amount of net losses may vary significantly from year-to-year and quarter-to-
quarter and depend on, among other factors, the success of the Company in
securing collaborative partners and the progress of research and pre-clinical
and clinical development programs. The Company's ability to attain profitability
will depend, among other things, on its successfully completing development of
its product candidates, obtaining regulatory approvals, establishing
manufacturing, sales and marketing capabilities and obtaining 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.

     Dependence on Elan Joint Ventures. The Company's strategy for research,
development and commercialization of certain of its products is to rely in part
upon various arrangements with corporate partners. As a result, the Company's
products are dependent in large part upon the subsequent success of such third
parties in performing pre-clinical studies and clinical trials, obtaining
regulatory approvals, manufacturing and marketing. In January 1998, the Company
entered into a joint venture with Elan Corporation, plc ("Elan") for the
exclusive research, development and commercialization of oral and mucosal
prophylactic and therapeutic vaccines. In October 1998, the Company entered into
a second joint venture with Elan for the exclusive research, development and
commercialization of products using Elan's Medipad(TM) drug delivery system for
two drugs in undisclosed fields. In connection with the two joint ventures, the
Company is obligated to fund each joint venture's research and development
activities in an amount up to approximately $1.5 million during the first year
of each joint venture and in proportion to its ownership interest in each joint
venture thereafter. In the event the Company does not have sufficient resources
to meet its funding obligations under the two joint ventures as well as other
ongoing research and development activities of the Company, the Company's
funding obligations under the two joint ventures could have a material adverse
effect on the Company's business, financial condition or results of operations.
The Company intends to pursue additional collaborations in the future. There can
be no assurance that the Company will be able to negotiate additional acceptable
collaborative arrangements or that such arrangements will be successful. No
assurance can be given that the Company's collaborative partners will be able to
obtain FDA approval for any licensed compounds, that any such licensed
compounds, if so approved, will be able to be commercialized successfully, or
that the Company will realize any revenues pursuant to such arrangements.
Although the Company believes that parties to collaborative arrangements
generally have an economic motivation to succeed in performing their contractual
responsibilities, the amount and timing of resources which they devote to these
activities are not within the control of the Company. There can be no assurance
that such parties will perform their obligations as expected or that current or
potential collaborators will not pursue treatments for other diseases or seek
alternative means of developing treatments for diseases targeted by
collaborative programs with the Company or that any additional revenues will be
derived from such arrangements. If any collaborative partner breaches or
terminates its agreement with the Company or otherwise fails to conduct its
collaborative activities in a timely manner, the development or
commercialization of the product candidate or research program under such
collaboration agreement may be delayed, the Company may be required to undertake
unforeseen additional responsibilities or to devote unforeseen additional
resources to such development or commercialization, or such development or
commercialization could be terminated. The termination or cancellation of
collaborative arrangements could also adversely effect the Company's financial
condition, intellectual property position and results of
<PAGE>
 
operations. In addition, disagreements between collaborators and the Company
have in the past and could in the future lead to delays in the collaborative
research, development or commercialization of certain product candidates, or
could require or result in legal process or arbitration for resolution. These
consequences could be time consuming, expensive and could have a material
adverse effect on the Company's business, financial condition or results of
operations.

     Limited Experience and Dependence on Third Parties for Completion of
Clinical Trials, Manufacturing and Marketing. The Company has no experience with
receipt of government approvals or marketing pharmaceutical products and has
limited experience with clinical testing and manufacturing. The Company may seek
to form alliances with established pharmaceutical companies for the testing,
manufacturing and marketing of, and pursuit of regulatory approval for, its
products. There can be no assurance that the Company will be successful in
forming such alliances or that the Company's partners would devote adequate
resources to, and successfully market, the Company's products. If the Company
instead performs such tasks itself, it will be required to develop expertise
internally or contract with third parties to perform these tasks. This will
place increased demands on the Company's resources, requiring the addition of
new management personnel and the development of additional expertise by existing
management personnel. The failure to acquire such services or to develop such
expertise could materially adversely affect prospects for the Company's success.
All of the Company's scientific and clinical advisors are employed by others and
may have commitments to or consulting or advisory contracts with other entities
that may limit their availability to the Company.

     Reliance on Patents and Other Proprietary Rights. The pharmaceutical
industry places considerable importance on obtaining patent and trade secret
protection for new technologies, products and processes. The Company's success
will depend, in part, on its ability to obtain protection for its products and
technologies under United States and foreign patent laws and other intellectual
property laws, to preserve its trade secrets and to operate without infringing
the proprietary rights of third parties. There can be no assurance that the
research conducted by or on behalf of the Company will result in any patentable
technology or products. Even if patents are obtainable, the procedure for
obtaining patents is expensive, time consuming and can be subject to lengthy
litigation. No assurance can be given that patents issued to or licensed by the
Company will not be challenged, invalidated or circumvented, or that the rights
granted thereunder will provide competitive advantages to the Company. There can
be no assurance that the Company's patent applications will be approved, that
the Company will develop additional products that are patentable, that any
issued patent will provide the Company with any competitive advantage or
adequate protection for its inventions or will not be challenged by others, or
that the patents of others will not have an adverse effect on the ability of the
Company to do business. Competitors may have filed applications, may have
been issued patents or may obtain additional patents and proprietary rights
relating to products or processes competitive with those of the Company.
Furthermore, there can be no assurance that others will not independently
develop similar products, duplicate any of the Company's products or design
around any patented products developed by the Company. Moreover, it is
possible, with respect to some patentable items, that the Company may conclude
that better protection would be afforded by not seeking patents. Although the
Company has endeavored, and will continue to endeavor, to prevent disclosure of
any confidential information by adopting a policy to bind its scientific
advisors and scientific and management employees and consultants by
confidentiality agreements. No assurance can be given that others will not
independently develop substantially equivalent proprietary information and
<PAGE>
 
techniques or otherwise gain access to the Company's trade secrets, or that the
Company can effectively protect its rights to its unpatented trade secrets. Any
such discovery or disclosure would likely have an adverse effect on the
Company.

     The Company currently has several patents issued and patent applications
pending in the United States and foreign countries. Although the Company intends
to apply for additional patents, there can be no assurance that the Company will
obtain patents either under the pending applications or any future applications
or that any of its existing or any future patent will provide effective
protection against competitive products. If patent or other proprietary rights
cannot be obtained and maintained by the Company, its products may face
significantly increased competition.

     The application of patent law to the area of biotechnology is relatively
new and has resulted in considerable litigation. The ability of the Company to
obtain patents, licenses and similar rights and the nature, extent and
enforceability of the intellectual property rights, if any, that are obtained as
a result of its research programs involve complex legal and factual issues. For
example, the Company is dependent upon its license of oral delivery technology
from MIT and its license of Perillyl alcohol from the Wisconsin Alumni Research
Foundation. No assurance can be given that the technology underlying such
license will be profitable, or that the Company will retain its license for such
technology or that the Company will obtain patent protection outside the United
States. The issues are more significant with respect to any product based upon
natural substances, for which available patent protection may be limited due to
the prior use or reported utility of such products (or their natural sources) to
treat various disorders or diseases. There can be no assurance as to the degree
of protection that proprietary rights, when and if established, will afford the
Company. To the extent that the Company relies on trade secret protection and
confidentiality agreements to protect technology, there can be no assurance that
others will not independently develop similar technology, or otherwise obtain
access to the Company's findings or research materials embodying those findings.

     There is also a substantial risk in the rapidly developing biotechnology
industry that patents and other intellectual property rights held by the Company
could be infringed by others or that products developed by the Company or their
method of manufacture could be covered by patents owned by other companies. To
the extent that any infringement should occur with respect to any patents issued
to the Company or licenses granted to the Company, or if the Company is alleged
to have infringed on patents or licenses held by others, the Company could be
faced with the expensive prospect of litigating such claims; if the Company were
to have insufficient funds on hand to finance its litigation, it might be forced
to negotiate a license with such other parties or to otherwise resolve such a
dispute on terms less favorable to the Company than could result from successful
litigation.

     Uncertainty of Clinical Trials and Results. The results of clinical trial
and pre-clinical testing for the Company's products are subject to varying
interpretations. Furthermore, studies conducted with alternative designs or on
alternative populations could produce results that vary from those expected.
Therefore, there can be no assurance that the results or the Company's
interpretation of them will be accepted by governmental regulators or the
medical community. Even if the development of the Company's products in the pre-
clinical phase advances to the clinical stage, there can be no assurance that
they will prove to be safe and effective. The products that are successfully
developed, if any, will be subject to requisite regulatory approval prior to
their commercial sale, and the approval, if obtainable, may
<PAGE>
 
take several years.  Generally, only a very small percentage of the number of
new pharmaceutical products initially developed is approved for sale. Even if
new products are approved for sale, there can be no assurance that they will be
commercially successful. The Company may encounter unanticipated problems
relating to development, manufacturing, distribution and marketing, some of
which may be beyond the Company's financial and technical capacity to solve.
The failure to address such problems adequately could have a material adverse
effect on the Company's business, financial condition or results of operations.
No assurance can be given that the Company will succeed in the development and
marketing of any new drug products, or that they will not be rendered obsolete
by products of competitors.

     Uncertainty of Health Care Reform Measures. Federal, state and local
officials and legislators (and certain foreign government officials and
legislators) have proposed or are reportedly considering proposing a variety of
reforms to the health care systems in the United States and abroad. The Company
cannot predict what health care reform legislation, if any, will be enacted in
the United States or elsewhere. Significant changes in the health care system
in the United States or elsewhere are likely to have a substantial impact over
time on the manner in which the Company conducts its business. Such proposals
and changes could have a material adverse effect on the Company's ability to
raise capital. Furthermore, the Company's ability to commercialize its potential
products may be adversely affected to the extent that such proposals
have a material adverse effect on the business, financial condition and
profitability of other companies that are prospective corporate partners with
respect to certain of the Company's proposed products.

     Uncertain Extent of Price Flexibility and Third-Party Reimbursement. The
Company's ability to commercialize its products successfully will depend in part
on the extent to which appropriate reimbursement levels for the cost of such
products and related treatment are obtained from government authorities, private
health insurers and other organizations, such as health maintenance
organizations ("HMOs"). Third party payers are increasingly challenging the
prices charged for medical products and services. Also, the trend towards
managed health care in the United States and the concurrent growth of
organizations such as HMOs, which could control or significantly influence the
purchase of health care services and products, as well as legislative proposals
to reduce government insurance programs, may all result in lower prices for the
Company's products. The cost containment measures that health care providers are
instituting could affect the Company's ability to sell its products and may have
a material adverse effect on the Company.

     Government Regulation; Need for FDA and Other Regulatory Approval. Prior to
marketing, each of the Company's products must undergo an extensive regulatory
approval process conducted by the U.S. Food and Drug Administration (the "FDA")
and applicable agencies in other countries. The process, which focuses on safety
and efficacy and includes a review by the FDA of pre-clinical testing and
clinical trials and investigating as to whether good laboratory and clinical
practices were maintained during testing, takes many years and requires the
expenditure of substantial resources. The Company is, and will be dependent on
the external laboratories and medical institutions conducting its pre-clinical
testing and clinical trials to maintain both good laboratory practices
established by the FDA and good clinical practices. Data obtained from pre-
clinical and clinical testing are subject to varying interpretations which could
delay, limit or prevent regulatory approval. In addition, delays or rejection
may be encountered based upon changes in FDA policy for drug approval during the
period of development and by the requirement for regulatory review of each
submitted Product License Approval or New Drug Application. There can be no
assurance that, even after such time and
<PAGE>
 
expenditures, regulatory approval will be obtained for any of the Company's
product candidates. Moreover, such approval may entail significant limitations
on the indicated uses for which a drug may be marketed. Even if such
regulatory approval is obtained, a marketed therapeutic product and its
manufacturer are subject to continual regulatory review, and later discovery
of previously unknown problems with a product or manufacturer may result in
restrictions on such product or manufacturing, including withdrawal of such
product from the market. Change in the manufacturing procedures used by the
Company for any of the Company's approved drugs are subject to FDA review,
which could have an adverse effect upon the Company's ability to continue the
commercialization or sale of a drug. The process of obtaining FDA and foreign
regulatory approval is costly and time consuming, and there can be no
assurance that any product that the Company may develop will be deemed to be
safe and effective by the FDA. The Company will not be permitted to market any
product it may develop in any jurisdiction in which the product does not
receive regulatory approval.

     The Company is also subject to various foreign, federal, state and local
laws, regulations and recommendations (collectively "Governmental Regulations")
relating to safe working conditions, laboratory and manufacturing practices, the
experimental use of animals and the use, manufacture, storage, handling and
disposal of hazardous or potentially hazardous substances, including radioactive
compounds and infectious disease agents, used in connection with the Company's
research and development work and manufacturing processes. Although the Company
believes it is in compliance with all other Governmental Regulations in all
material respects there can be no assurance that the Company will not be
required to incur significant costs to comply with Governmental Regulations in
the future.

     Competition; Technological Change. There is substantial competition in the
pharmaceutical field in general and in vaccine development and liposomal
formulation in particular. The Company's competitors include companies with
financial resources, and licensing, research and development staffs and
facilities substantially greater than those of the Company. Competitors in the
vaccine development field include major pharmaceutical companies, specialized
biotechnology firms, universities and governmental agencies, including American
Home Products, the Merck Company, SmithKline Beecham, MedImmune, Aviron and
Chiron. Competitors in the liposomal formulation field include The Liposome
Company, NexStar and Sequus. Competitors in the field of the oral delivery of
drugs include Emisphere, which is currently in Phase II trials for oral heparin
and in pre-clinical development with oral hormones, and Cortecs, which has
several products in clinical development. Additionally there are numerous major
pharmaceutical companies and biotech companies developing new cancer therapies.
Many competitors have greater experience than the Company in undertaking pre-
clinical testing and clinical trials and obtaining FDA and other regulatory
approvals. There can be no assurance that the Company's competitors will not
succeed in developing similar technologies and products more rapidly than the
Company and that these technologies and products will not be more effective than
any of those that are being or will be developed by the Company, or that such
competitors' technologies and products will not render the Company's
technologies and products obsolete or noncompetitive.

     Manufacturing and Marketing Capabilities. The Company does not now
have, and probably will not have in the foreseeable future, the resources to
manufacture or directly market on a large commercial scale any products which
it may develop. In connection with the Company's research and development
activities, it will seek to enter into collaborative arrangements with
pharmaceutical companies to assist in funding development costs, including the
<PAGE>
 
costs of clinical testing necessary to obtain regulatory approvals. It is
expected that these entities will also be responsible for commercial scale
manufacturing which must be in compliance with applicable FDA regulations. The
Company anticipates that such arrangements may involve the grant by the Company
of the exclusive or semi-exclusive right to sell specific products to specified
market segments in particular geographic territories in exchange for a royalty,
joint venture, future co-marketing or other financial interest. The Company
believes that these arrangements will be more effective in promoting and
distributing therapeutic products in the United States in view of the Company's
limited resources and the extensive marketing networks and large advertising
budgets of large pharmaceutical companies. To date, the Company has not entered
into any collaborative marketing agreements or distributorship arrangements for
any of its proposed products and there can be no assurance that the Company
will be able to enter into any such arrangements on favorable terms or at all.
The Company may ultimately determine to establish its own manufacturing and/or
marketing capability, at least for certain products, in which case it will
require substantial additional funds and personnel.

     Use of Hazardous Materials; Environmental Matters. The Company's
research and development involves the controlled use of small quantities of
hazardous materials, chemicals and various radioactive compounds. Although the
Company believes that its safety procedures for handling and disposing of such
materials comply with the standards prescribed by federal, state and local
regulations, the risk of accidental contamination or injury from these
materials cannot be eliminated. In the event of such an accident, the Company
could be held liable for any resulting damages, and any such liability could
exceed the resources of the Company. There can be no assurance that the Company
will not be required to incur significant costs to comply with environmental
laws and regulations in the future, nor that the operations, business or assets
of the Company will not be materially adversely affected by current or future
environmental laws or regulations.

     Product Liability Exposure; Limited Insurance Coverage. The testing and
marketing of pharmaceutical products entails an inherent risk of exposure
To product liability claims from adverse effects of products. As of March 10,
1998, the Company has increased its liability insurance with limits of liability
to $10.0 million for each claim from $1.0 million, and $10.0 million in the
aggregate, from $3.0 million. There is no assurance that current or future
policy limits will be sufficient to cover all possible liabilities. Further,
there can be no assurance that adequate product liability insurance will
continue to be available in the future or that it can be maintained at
reasonable costs to the Company. In the event of a successful product liability
claim against the Company, lack or insufficiency of insurance coverage could
have an adverse effect on the Company.

     Dependence on Key Personnel and Scientific Advisors; Evolution of
Management. The Company is dependent on the principal members of its management
and scientific staff, the loss of whose services could impede the achievement
of development objectives. The Company's founder, Chairman of the Board, and
Scientific Director, Gerald Vosika, M.D., resigned in February 1998, and is now
a consultant to the Company.  His consulting agreement expires in May 1999.
Furthermore, as the Company's focus evolves, the Company's need for certain
skills may diminish and the need for other skills may arise. Thus, recruiting
and retaining qualified scientific personnel to perform research and development
work in the future will also be critical to the Company's success and may lead
to further evolution of the Company's management.  Although the Company believes
it will be successful in attracting and retaining skilled and experienced
scientific personnel, there can be no assurance that the Company will be able to
attract and retain such personnel on acceptable terms given the
<PAGE>
 
competition among numerous pharmaceutical and health care companies,
universities and non-profit research institutions for experienced scientists and
managers.

     The Company's scientific advisors are employed on a full-time basis by
unrelated employers and some have one or more consulting or other advisory
arrangements with other entities which at times may conflict with their
obligations to the Company. Inventions or processes discovered by such persons,
other than those to which the Company's licenses relate, or those for which the
Company is able to acquire licenses or those which were invented while
performing consulting services under contract to the Company, will most likely
not become the property of the Company, but will remain the property of such
persons or such persons' full-time employers. Failure to obtain needed patents,
licenses or proprietary information held by others could have a material adverse
effect on the Company's business, financial condition or results of
operations.

     Limited Personnel; Dependence on Contractors. As of November 13, 1998, the
Company had sixteen full-time employees. With the exception of these employees,
the Company relies, and for the foreseeable future will rely, on certain
independent organizations, advisors and consultants to provide certain services
with regard to clinical research. There can be no assurance that their services
will continue to be available to the Company on a timely basis when needed, or
that the Company could find qualified replacements. The Company's advisors and
consultants generally sign agreements that provide for confidentiality of the
Company's proprietary information. However, there can be no assurance that the
Company will be able to maintain the confidentiality of the Company's
technology, the dissemination of which could have a material adverse effect on
the Company's business, financial condition or results of operations.

     Conducting Business Abroad. Although the Company currently does not
conduct business outside the United States, it is in discussions with potential
strategic partners for the in-licensing and out-licensing of technology and the
development and marketing of its products. No assurance can be given that the
Company will be able to establish arrangements covering foreign countries, that
the necessary foreign regulatory approvals for its product candidates will be
obtained, that foreign patent coverage will be available or that the development
and marketing of its products through such licenses, joint ventures or other
arrangements will be commercially successful. The Company may also have greater
difficulty obtaining proprietary protection for its products and technologies
outside the United States rather than in it, and enforcing its rights in foreign
courts rather than in United States courts.

     Limited Availability of Net Operating Loss Carry Forwards. For Federal
income tax purposes, net operating loss and tax credit carryforwards as of
December 31, 1997 are approximately $5.2 million and $322,000, respectively.
These carryforwards will expire beginning in 2004 through 2011. The Tax Reform
Act of 1986 provided for a limitation on the use of net operating loss and tax
credit carryforwards following certain ownership changes. The Company believes
that the Private Placement, together with certain prior issuances of common
stock, is likely to restrict severely the Company's ability to utilize its net
operating losses and tax credits. Additionally, because U.S. tax laws limit the
time during which net operating loss and tax credit carryforwards may be applied
against future taxable income tax liabilities, the Company may not be able to
fully utilize its net operating loss and tax credits for federal income tax
purposes.

     Potential Volatility of Price; Low Trading Volume. The market price of
<PAGE>
 
the Common Stock, like that of many other development-stage public
pharmaceutical or biotechnology companies, has been highly volatile and may
continue to be in the future. Factors such as announcements of technological
innovations or new commercial products by the Company or its competitors,
disclosure of results of pre-clinical and clinical testing, adverse reactions to
products, governmental regulation and approvals, developments in patent or other
proprietary rights, public or regulatory agency concerns as to the safety of
products developed by the Company and general market conditions may have a
significant effect on the market price of the Common Stock and its other equity
securities. Since August 6, 1998, the Company's common stock has been thinly
traded on the American Stock Exchange. There can be no assurance that a more
active trading market will develop in the future.

     Dividends. The Company has never paid cash dividends on its common stock
and does not anticipate paying any such dividends in the foreseeable future. The
Company currently intends to retain its earnings, if any, for the development of
its business.

     Certain Interlocking Relationships; Potential Conflicts of Interest. Steve
H. Kanzer, C.P.A., Esq., a director of the Company, is a Senior Managing
Director of Paramount Capital, Inc. ("Paramount"). Paramount Capital Asset
Management, Inc. ("PCAM") is the investment manager and general partner of The
Aries Fund, a Cayman Island Trust, and the Aries Domestic Fund, L.P.,
respectively, each of which is a significant shareholder of the Company. Lindsay
A. Rosenwald, M.D., the President and sole stockholder of PCAM, is also the
President and sole stockholder of Paramount. Dr. Rosenwald is also President and
sole stockholder of Paramount Capital Investment LLC ("PCI"), a merchant banking
and venture capital firm specializing in biotechnology companies. In addition,
certain officers, employees and/or associates of Paramount and/or its affiliates
own securities in the Company's subsidiaries. In the regular course of its
business, PCI identifies, evaluates and pursues investment opportunities in
biomedical and pharmaceutical products, technologies and companies. Generally,
Delaware corporate law requires that any transactions between the Company and
any of its affiliates be on terms that, when taken as a whole, are substantially
as favorable to the Company as those then reasonably obtainable from a person
who is not an affiliate in an arms-length transaction. Nevertheless, neither
such affiliates nor PCI is obligated pursuant to any agreement or understanding
with the Company to make any additional products or technologies available to
the Company, nor can there be any assurance, and the Company does not expect and
purchasers of the securities offered hereby should not expect, that any
biomedical or pharmaceutical product or technology identified by such affiliates
or PCI in the future will be made available to the Company. In addition, certain
of the current officers and directors of the Company or certain of any officers
or directors of the company hereafter appointed may from time to time serve as
officers or directors of other biopharmaceutical or biotechnology companies.
There can be no assurance that such other companies will not have interests in
conflict with those of the Company.

     Concentration of Ownership and Control. The Company's directors,
executive officers and principal stockholders and certain of their affiliates
have the ability to influence the election of the Company's directors and most
other stockholder actions. In particular, pursuant to the Placement Agency
Agreement, so long as 50% of the Private Placement Shares remain outstanding
and subject contractual rights described in the subscription agreement between
The Company and each signatory thereto (the "Subscription Agreements"), the
Company may not do any of the following without the Placement Agent's prior
approval: (i) issue or increase the authorized amount or alter the terms of any
securities of the Company senior to, or on parity with, the Private Placement
<PAGE>
 
Shares with respect to voting, liquidation or dividends, (ii) alter the
Company's charter documents in any manner that would adversely affect the
relative rights, preferences, qualifications, limitations or restrictions of
the Private Placement Shares or of certain contractual rights described in the
Subscription Agreements, (iii) incur indebtedness in excess of $1.0 million,
(iv) incorporate or acquire any subsidiaries and (v) enter any transactions with
affiliates of the Company. In addition, the Company's Board of Directors
cannot exceed seven persons without the prior written consent of the Placement
Agent. These arrangements may discourage or prevent any proposed takeover of the
Company, including transactions in which stockholders might otherwise receive a
premium for their shares over the then current market prices. Such
stockholders may influence corporate actions, including influencing elections
of directors and significant corporate events. See also, "--Certain
Interlocking Relationships; Potential Conflicts of Interest."




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