CEPHALON INC
S-3/A, 1997-05-01
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
 
   
      As filed with the Securities and Exchange Commission on May 1, 1997
    
 
   
                                                      REGISTRATION NO. 333-24793
    
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                             ---------------------
   
                                AMENDMENT NO. 1
    
   
                                       TO
    
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933
                             ---------------------
                                 CEPHALON, INC.
             (Exact name of registrant as specified in its charter)
 
                                    Delaware
         (State or other jurisdiction of incorporation or organization)
 
                                   23-2484489
                      (I.R.S. Employer Identification No.)
 
                             145 Brandywine Parkway
                             West Chester, PA 19380
                                 (610) 344-0200
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                             ---------------------
 
                              BARBARA S. SCHILBERG
                                 Cephalon, Inc.
                   Senior Vice President and General Counsel
                             145 Brandywine Parkway
                             West Chester, PA 19380
                                 (610) 344-0200
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                             ---------------------
                                   Copies to:
                              David R. King, Esq.
                          Morgan, Lewis & Bockius LLP
                             2000 One Logan Square
                             Philadelphia, PA 19103
                                 (215) 963-5000
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  [X]
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]  ________________
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]  ________________
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
                             ---------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH AN OFFER, SOLICITATION OR SALE WOULD
     BE UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES
     LAWS OF ANY STATE.
 
   
                    SUBJECT TO COMPLETION, DATED MAY 1, 1997
    
 
PROSPECTUS
 
                                 500,000 SHARES
 
                                 CEPHALON, INC.
 
                                  COMMON STOCK
 
   
     The shares offered hereby (the "Shares") consist of up to 500,000 shares of
common stock, $0.1 par value per share ("Common Stock"), of Cephalon, Inc., a
Delaware corporation ("Cephalon" or the "Company"), which are being offered by
Swiss Bank Corporation, London Branch ("SBC" or the "Selling Stockholder"). The
Shares may be offered from time to time by the Selling Stockholder. All expenses
of registration incurred in connection herewith are being borne by the Company,
but all selling and other expenses incurred by the Selling Stockholder will be
borne by the Selling Stockholder. The Company will not receive any of the
proceeds from the sale of the Shares by the Selling Stockholder.
    
 
   
     The Shares are being acquired by SBC, in one or more transactions, in
exchange for one or more capped options to be written by SBC on up to an
aggregate of 2,500,000 shares of Common Stock of the Company. The Company will
purchase each option from SBC and will use the Shares, in lieu of cash, to pay
the premium associated with each option. The option price, as well as the strike
price, cap price, number of shares subject to each option, expiration date and
certain other terms of each option, will be determined following the
effectiveness of the Registration Statement, based upon a number of factors,
including the market price of the Common Stock when each option is issued. See
"Call Option Transaction and Issuance of the Shares."
    
 
   
     The Selling Stockholder has advised the Company that the Shares may be sold
from time to time to or through its affiliate SBC Warburg Inc. ("SBC Warburg")
primarily in transactions (which may include block transactions) in the
over-the-counter market at prices then prevailing, or in negotiated
transactions. The Selling Stockholder and SBC Warburg and any other brokers and
dealers through whom sales of Shares may be made may be deemed to be
"underwriters" within the meaning of the Securities Act of 1933, as amended (the
"Securities Act"), and their commissions or discounts and other compensation may
be regarded as underwriters' compensation. See "Plan of Distribution."
    
 
   
     The Company's Common Stock is quoted on the Nasdaq National Market under
the symbol "CEPH." On April 30, 1997, the last reported sale price of the Common
Stock was $16.75 per share.
    
 
AN INVESTMENT IN THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF RISK.
                SEE "RISK FACTORS" ON PAGES 4 THROUGH 16 HEREIN.
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION
 PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
                      THE CONTRARY IS A CRIMINAL OFFENSE.
                  THE DATE OF THIS PROSPECTUS IS        , 1997
<PAGE>   3
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the reporting requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information filed by the Company can be inspected and
copied at the public reference facilities of the Commission, Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549, as well as the following
regional offices of the Commission: Seven World Trade Center, 13th Floor, New
York, New York 10048; and Citicorp Center, 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661. Copies of such material can be obtained from the
Commission by mail at prescribed rates. Requests should be directed to the
Commission's Public Reference Branch, Judiciary Plaza, 450 Fifth Street, N.W.,
Washington, D.C. 20549. Such material also may be accessed electronically by
means of the Commission's home page on the Internet (http://www.sec.gov). In
addition, such reports, proxy statements and other information concerning the
Company can be inspected at the National Association of Securities Dealers,
Inc., 1735 K Street, N.W., Washington, D.C. 20006.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents or portions of documents filed by the Company (File
No. 0-19119) with the Commission are incorporated herein by reference.
 
     (a)  Annual Report on Form 10-K/A-2 for the fiscal year ended December 31,
        1996 filed with the Commission on April 4, 1997.
 
     (b)  Current Report on Form 8-K dated January 16, 1997.
 
     (c)  Current Report on Form 8-K dated April 8, 1997.
 
     (d)  The Company's Proxy Statement related to its 1997 Annual Meeting of
        Stockholders filed under the Exchange Act on March 26, 1997.
 
     (e)  The description of the Company's Common Stock which is contained in
        its Registration Statement on Form 8-A filed under the Exchange Act on
        March 15, 1991, including any amendment or reports filed for the purpose
        of updating such description.
 
     (f)  The description of rights to purchase Series A Junior Participating
        Preferred Shares, par value $.01 per share, which is contained in the
        Company's Registration Statement on Form 8-A filed under the Exchange
        Act on November 22, 1993, including any amendment or reports filed for
        the purpose of updating such description.
 
     All reports and other documents subsequently filed by the Company pursuant
to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the filing
of a post-effective amendment which indicates that all securities offered hereby
have been sold or which deregisters all securities remaining unsold, shall be
deemed incorporated by reference herein and to be a part hereof from the date of
the filing of such reports and documents. Any statement contained in a document
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained or
incorporated by reference herein modifies or supersedes such statement. Any
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Prospectus.
 
     The Company will provide without charge to each person to whom this
Prospectus is delivered a copy of any or all of such documents which are
incorporated herein by reference (other than exhibits to such documents unless
such exhibits are specifically incorporated by reference into the documents that
this Prospectus incorporates). Written or oral requests for copies should be
directed to Jason Rubin, Vice President, Corporate Communications, Cephalon,
Inc., 145 Brandywine Parkway, West Chester, PA 19380, (610) 344-0200.
                                ---------------
 
                                        2
<PAGE>   4
 
     Myotrophin(R) and Provigil(R) are trademarks of Cephalon, Inc. Cephalon has
registered or filed applications to register the trademarks in the United States
and certain other countries. All other trademarks and registered marks in this
Prospectus are the property of their respective holders.
 
     Unless the context otherwise requires, "Cephalon" or the "Company" refers
to Cephalon, Inc. and its wholly-owned subsidiaries.
 
                                        3
<PAGE>   5
 
                                  THE COMPANY
 
     Cephalon seeks to discover and develop pharmaceutical products for the
treatment of neurological disorders. The Company's research and development
efforts focus primarily on neurodegenerative diseases, which are characterized
by the death of neurons, the specialized conducting cells of the nervous system.
The Company utilizes its technical expertise in molecular biology, molecular
pharmacology, biochemistry, cell biology and chemistry to develop products in
four core technology areas: neurotrophic factors, protease inhibitors, signal
transduction modulators and regulators of gene transcription. Cephalon believes
that its multidisciplinary technology approach provides the basis for the
development of a portfolio of potential products for the treatment of
neurodegenerative disorders such as amyotrophic lateral sclerosis ("ALS" or "Lou
Gehrig's disease"), peripheral neuropathies, Alzheimer's disease and stroke.
 
     Cephalon's business strategy includes forming alliances with other
pharmaceutical companies where collaborations can provide strategic advantages
in technological, financial, marketing, manufacturing and other areas. In these
arrangements, the Company seeks, where appropriate, to retain the rights to
co-promote or otherwise share in the marketing of products, particularly to
neurologists. The Company also seeks to selectively in-license late stage
compounds for development.
 
     The Company has established a 36-person sales organization in the United
States focusing on neurologists, which is presently co-promoting two
Bristol-Myers Squibb Company ("BMS") proprietary products, Stadol NS(R)
(butorphanol tartrate), for the management of pain when the use of an opioid
analgesic is appropriate and Serzone(R) (nefazodone hydrochloride), which is
indicated for the treatment of depression.
 
     The Company has not received approval from any regulatory authority to
market any drug candidate. Two new drug applications ("NDA") have been submitted
by the Company to the U.S. Food and Drug Administration ("FDA"): one for the use
of MYOTROPHIN(R) (rhIGF-I) in treating ALS, and one for the use of PROVIGIL(R)
(modafinil) in treating the excessive daytime sleepiness associated with
narcolepsy. Additionally, marketing applications for PROVIGIL (modafinil) are
pending in the United Kingdom and the Republic of Ireland, and a marketing
authorization application for MYOTROPHIN (rhIGF-I) is being prepared for filing
in Europe. There can be no assurance that the applications will be approved or
that the Company will successfully commercialize any of its potential products.
 
     Cephalon was incorporated in Delaware in August 1987. The Company's
executive offices and research facility are located at 145 Brandywine Parkway,
West Chester, PA 19380, and its telephone number is (610) 344-0200.
 
                                  RISK FACTORS
 
     In addition to the other information in this Prospectus, prospective
investors should consider the following factors in evaluating the Company and
its business before purchasing any of the Common Stock offered hereby.
 
UNCERTAINTIES RELATED TO MYOTROPHIN(R) (RHIGF-I) PHASE III REGULATORY
SUBMISSIONS
 
     In 1995, the Company submitted to the FDA a treatment investigational new
drug application ("T-IND") to permit expanded access to MYOTROPHIN (rhIGF-I) by
patients in the United States suffering from ALS. The FDA referred the
application to the Peripheral and Central Nervous System Drugs Advisory
Committee (the "Advisory Committee"), which held a public hearing in June 1996
to review data from two Phase III studies, one conducted in North America and
one in Europe, for purposes of recommending to the FDA whether there was
sufficient evidence to support use of MYOTROPHIN (rhIGF-I) under a T-IND. At the
hearing, representatives of the FDA indicated their disagreement with the
Company's various analyses of the European study and their opinion that the
study failed to support the results of the North American study. At the
conclusion of the Advisory Committee hearing, the panel members unanimously
recommended approval of the T-IND.
 
                                        4
<PAGE>   6
 
     The FDA approved the T-IND application on June 19, 1996. The FDA's approval
letter noted the views of several Advisory Committee members expressed at the
hearing, including the chairman, concerning the need for an additional study to
support an NDA, and invited Cephalon and Chiron Corporation ("Chiron") to work
with the FDA to develop plans for future studies. The Company continues to
believe that the two completed studies show the beneficial treatment effect of
MYOTROPHIN (rhIGF-I) in ALS patients particularly those with more rapidly
progressing disease and, in collaboration with Chiron, filed an NDA with the FDA
in February 1997 requesting that MYOTROPHIN (rhIGF-I) be approved for the
treatment of ALS in the United States. There can be no assurance that the FDA
will ultimately grant authorization to commercialize MYOTROPHIN (rhIGF-I) in the
United States on the basis of the results of the two completed studies. The FDA
has scheduled a meeting of the Advisory Committee to be held on May 8, 1997 to
review the NDA for MYOTROPHIN (rhIGF-I). The Company has indicated its
willingness to conduct additional studies of MYOTROPHIN (rhIGF-I) as a
post-approval activity. If the FDA were to require additional data prior to
approval of MYOTROPHIN (rhIGF-I) for commercialization, there can be no
assurance that the Company and Chiron would be willing or able to conduct any
study as a Phase III activity or that the results of such study, if conducted,
would be positive. A new study also would be expensive and would take several
years to complete.
 
     Because ALS is a fatal disease, it is expected that some mortalities will
occur while conducting clinical trials in ALS patients. During the double-blind
portion of the European study, an imbalance in death rates was observed in the
drug-treated group compared to the placebo-treated group. The Company believes
that mortalities observed in the North American and European clinical studies
are due to the normal progression of the disease or other circumstances not
attributable to MYOTROPHIN (rhIGF-I). The Company is continuing to furnish
MYOTROPHIN (rhIGF-I) to patients who participated in the ALS studies, to
patients in its Phase II program in peripheral neuropathies, and to patients
under the recently initiated T-IND program. FDA regulations require the
reporting of all patient adverse events (including deaths) experienced in
ongoing trials. There can be no assurance that any such event previously
reported by the Company, or which may occur in the future, will not delay or
prevent the approval of MYOTROPHIN (rhIGF-I) or result in any subsequent FDA
action adverse to the interests of the Company.
 
     The efficacy and safety data from the North American and European studies
of MYOTROPHIN (rhIGF-I) have not yet been formally reviewed by any regulatory
authority outside the United States. The companies are preparing a marketing
authorization application for filing in Europe. If foreign regulatory
authorities do not agree with the Company's interpretation of the results from
the two studies, one or more additional positive studies might be required to be
completed and submitted before MYOTROPHIN (rhIGF-I) could be marketed in such
territories.
 
     There can be no assurance that any regulatory authority will accept the
North American and European studies as evidence of sufficient safety and
efficacy to support marketing approval or that MYOTROPHIN (rhIGF-I) will receive
marketing approval in any jurisdiction for any indication. A delay in obtaining
approval or a failure to obtain any approval for MYOTROPHIN (rhIGF-I) would
materially adversely affect the Company's business and the price of the Common
Stock. See "Volatility of Stock Price; No Dividends".
 
UNCERTAINTIES RELATED TO PROVIGIL(R) (MODAFINIL) PHASE III REGULATORY
SUBMISSIONS
 
     The Company recently submitted an NDA with the FDA requesting that PROVIGIL
(modafinil) be approved for the treatment of the excessive daytime sleepiness
associated with narcolepsy, based on the results of two Phase III studies
conducted in the United States. There can be no assurance that the FDA or other
regulatory authorities will determine that the results generated from the
Company's clinical trials demonstrate sufficient safety and efficacy to permit
marketing approval.
 
     The Company also is pursuing applications seeking authorization to market
PROVIGIL (modafinil) in the Republic of Ireland and the United Kingdom, which
are other territories licensed from Laboratoire L. Lafon ("Lafon"). The
regulatory authorities in both countries have requested that additional
information be provided with respect to the applications (which were filed by
Lafon under the multi-state procedures of the Committee for Proprietary
Medicinal Products ("CPMP")). There can be no assurance that the Company
 
                                        5
<PAGE>   7
 
will be able to provide sufficient additional information in order to permit
approval of the applications. Even if those applications are approved, the
Company must also request permission to vary the applications with respect to
certain manufacturing procedures and other matters. There can be no assurance
that any regulatory approvals or variations will be obtained at all or in a
timely manner. The Company is in the process of establishing a sales force in
the U.K. and the Republic of Ireland to sell PROVIGIL (modafini1). Any delays in
accomplishing these activities could delay launch of the product, if it is
approved. The Company is required, under the terms of its license with Lafon, to
launch the product no later than three months after approval.
 
UNCERTAINTIES RELATED TO PRODUCT DEVELOPMENT, REGULATORY APPROVAL AND
MARKETABILITY
 
     The success of the Company depends to a large degree upon obtaining FDA and
foreign regulatory approval to market products currently under development.
Cephalon has had only limited experience in filing and pursuing applications
necessary to gain regulatory approvals. The Company's analysis and
interpretation of the results of the Company's clinical studies is subject to
confirmation and interpretation by regulatory authorities, which may differ from
the Company's analysis. There can be no assurance that the data or the Company's
interpretation of data will be accepted by any regulatory authority. In
addition, there can be no assurance that any application by the Company to
market a product will be reviewed in a timely manner or that approval to market
a product will be received from the appropriate regulatory authority.
 
     TAP Holdings Inc. ("TAP") has begun a Phase I clinical study of a compound
being developed in collaboration with the Company for the treatment of various
cancers, including prostate cancer. The objective of the multi-center study is
to examine the drug's pharmacokinetic and safety profile in patients with
advanced cancer. Because the compound has never been tested in humans, the risk
of safety problems is unknown. There can be no assurance that the compound will
prove to be safe in humans, or that it will show any therapeutic benefit.
 
     The results of preclinical and initial clinical trials of products under
development by the Company are not necessarily predictive of results that will
be obtained from large-scale clinical testing, and there can be no assurance
that clinical studies of products under development will demonstrate the safety
and efficacy of such products or will result in a marketable product. The safety
and efficacy of a therapeutic product under development by the Company generally
must be supported by statistically significant positive results from Phase III
clinical trials, and the failure to obtain such results could prevent regulatory
approval of the product, which would have a material adverse effect on the
Company.
 
     Even if MYOTROPHIN (rhIGF-I) and PROVIGIL (modafinil) are approved for
commercialization, the Company can not predict at this time the potential
revenues to be received from sales of MYOTROPHIN (rhIGF-I) for use in treating
ALS or from sales of PROVIGIL (modafinil) for use in connection with narcolepsy.
Once approved, there can be no assurance that such products will be accepted and
prescribed by physicians. Moreover, ALS and narcolepsy each qualify as orphan
diseases under the Orphan Drug Law, which generally means that the potential
patient population for each indication is limited.
 
     The administration of any product developed by the Company may produce
undesirable side effects in humans. The occurrence of such side effects could
interrupt or delay clinical studies of such products and could ultimately
prevent their approval by the FDA or foreign regulatory authorities for any or
all targeted indications. The Company or the FDA may suspend or terminate
clinical trials at any time if it is believed that the people participating in
such trials are being exposed to unacceptable health risks. Even after approval
by the FDA and foreign regulatory authorities, products may later exhibit
adverse effects that prevent their widespread use or necessitate their
withdrawal from the market. There can be no assurance that any products under
development by the Company will be safe when administered to patients.
 
     The results of clinical studies of product candidates under development by
the Company which are conducted by collaborators of the Company, including
studies of rhIGF-I being conducted by the Company's licensee in Japan and
clinical studies of modafinil being conducted by Lafon and its licensees in
other countries, are required to be reported by the Company to the FDA and other
regulatory authorities. The reporting of the results of these other studies, if
negative, could adversely affect the regulatory review of the Company's product
approval applications. Negative results from trials by third parties or negative
assessments
 
                                        6
<PAGE>   8
 
from regulatory authorities would adversely affect the Company's business and
the price of its Common Stock. See "Volatility of Stock Price; No Dividends."
 
NEED FOR ADDITIONAL FUNDS
 
     The Company expects its negative cash flow to continue due to funding of
research, development, clinical trial, regulatory filing and other costs. In
addition, selling, general and administrative activities in the United States
and Europe may be expanded as the Company evaluates the potential for obtaining
regulatory approvals of MYOTROPHIN (rhIGF-I) and PROVIGIL (modafinil). Any such
expansion would require substantial funding. The Company may also build
inventories of MYOTROPHIN (rhIGF-I) and PROVIGIL (modafinil), which also would
require substantial funding. The capital required to fund the Company's
operations for 1997 may be greater than that of the prior year. The amount
needed to fund operations will depend upon many factors, including the success
of the Company's research and development programs, the extent of any
collaborative research or other funding arrangements, the costs and timing of
seeking regulatory approvals, if any, of its products, technological changes,
competition and the success of the Company's sales and marketing activities.
Schering-Plough Corporation ("Schering") recently decided to conclude its
funding of the research program with the Company related to amyloid protease
inhibitors and Alzheimer's disease. The Company intends to continue the program
using its own resources. Under the terms of its agreement with Schering, the
Company may not conduct the same research program with a third party until the
end of 1997.
 
     In August 1992, Cephalon exclusively licensed to Cephalon Clinical
Partners, L.P. (the "Partnership") rights to MYOTROPHIN (rhIGF-I) for human
therapeutic use within the United States, Canada and Europe (the "Territory") in
return for a non-refundable license fee of $500,000. Through a concurrent
offering of 900 limited partnership interests, the Partnership raised
approximately $38,714,000 in net proceeds (payable to the Partnership in annual
installments, the last of which was paid in August 1995) which it used to fund
the development of MYOTROPHIN (rhIGF-I). The Partnership exhausted its available
funding in 1995. Since that time, the Company has been funding the continued
development of MYOTROPHIN (rhIGF-I) from its own cash resources. The Partnership
granted the Company an exclusive license (the "Interim License") to manufacture
and market MYOTROPHIN (rhIGF-I) within the Territory in return for certain
royalty payments and a payment of approximately $16,000,000 (the "Milestone
Payment") that is to be made if MYOTROPHIN (rhIGF-I) receives regulatory
approval in the United States or certain other countries within the Territory.
The Company has a contractual option to purchase all of the limited partnership
interests in the Partnership (the "Purchase Option").
 
     If the Company is required to make the Milestone Payment and elects to do
so in cash, or if it elects to exercise its contractual option to purchase the
limited partnership interests in the Partnership for cash, as described below
under "Partnership Purchase Option," the Company will be required to make a
substantial cash payment. The Company may consider the purchase of some or all
of the remaining partnership interests other than through exercise of the
Purchase Option. The Company expects that the cost per interest associated with
any such purchase would be substantially greater than the cost incurred in the
1995 purchase of 67 limited partner interests and that, if the Company were to
elect to purchase some or all of the partnership interests in cash, significant
funds could be required.
 
     If the Company does not exercise the Purchase Option or continue funding
the development of MYOTROPHIN (rhIGF-I), its license will terminate and all
rights to manufacture or market MYOTROPHIN (rhIGF-I), in the Territory will
revert to the Partnership, which may then commercialize MYOTROPHIN (rhIGF-I)
itself or license or assign its rights to a third party. The Company would not
receive any benefits from such commercialization.
 
     The Company is obligated under various debt instruments to make principal
and interest payments to various state agencies and banks. Many of these
agreements contain restrictive covenants relating to, among other things, the
maintenance of minimum levels of working capital and limitations on the
incurrence of additional indebtedness that may limit the Company's flexibility
in utilizing its existing financial resources.
 
                                        7
<PAGE>   9
 
     To satisfy its capital requirements, including its continued funding of
MYOTROPHIN (rhIGF-I) and other programs, the Company may seek to access the
public or private equity markets whenever conditions are favorable. The Company
also intends to seek additional funding through corporate collaborations and
other financing vehicles, potentially including "off-balance sheet" financings
through limited partnerships or corporations. There can be no assurance that
such funding will be available at all or on terms acceptable to the Company. If
adequate funds are not available, the Company may be required to significantly
curtail one or more of its research or development programs or obtain funds
through arrangements with existing or future collaborative partners or others
that may require the Company to relinquish rights to certain of its
technologies, product candidates or products.
 
HISTORY OF OPERATING LOSSES
 
     The Company has not received revenue from the sale of any product developed
by the Company, and has accumulated aggregate losses of $157,967,000 from
inception through December 31, 1996. The Company expects to continue to incur
operating losses unless and until such time as product approvals are obtained
and product sales, if any, exceed operating expenses. The revenues to be
received and costs to be incurred by the Company depend to a large degree on the
results of regulatory actions with respect to the two NDAs recently filed with
the FDA with respect to MYOTROPHIN (rhIGF-I) and PROVIGIL (modafinil) and other
product programs. A majority of the Company's revenues to date have been under
agreements with collaborative partners and the Partnership. The Company expects
to have significant fluctuations in quarterly results based on the level and
timing of recognition of contract revenues and the incurrence of expenses. See
"Dependence on Collaborative Partners." Since the formation of the Partnership,
the Partnership has funded a significant portion of the expenses related to the
development of MYOTROPHIN (rhIGF-I). Due to the funding limitations of the
Partnership, the Company has not recognized revenue from this source since 1995.
Therefore, during that period, the Company funded the development of MYOTROPHIN
(rhIGF-I). In addition, if the Company were to make the Milestone Payment,
exercise the Purchase Option or purchase additional interests outside of the
Purchase Option, a material charge to earnings could result, depending upon the
development status of the underlying technology.
 
     The Company and Chiron are currently developing MYOTROPHIN (rhIGF-I) for
the treatment of ALS and certain peripheral neuropathics. The costs of the
program generally are shared equally by the partners. Revenue or expense to be
recognized by the Company under the collaboration with Chiron will depend on the
relative costs incurred by the two companies.
 
     The Company receives funding to support its research and development
activities conducted in collaboration with SmithKline Beecham plc ("SB") related
to calpain inhibitors, and with TAP, related to the use of certain compounds in
the treatment of cancers, including prostate disease. The funding levels under
these agreements are based on a contract rate for each Cephalon employee
assigned to the program, subject to annual budgetary maximums. The continuation
of the research funding under the agreements with SB and TAP are subject to the
achievement of certain development milestones by the Company and periodic review
by these companies and may be terminated without cause with prior notice. There
can be no assurance that these research programs will be continued or that the
Company's expenses incurred in any of these programs will be fully reimbursed by
its collaborator. Should a collaborator elect to terminate a research program,
the Company's ability to recover costs and expenses proportionately is limited,
because a significant portion of the Company's research expenses, including
depreciation and facility costs, are fixed.
 
MANUFACTURING UNCERTAINTIES AND RELIANCE ON THIRD-PARTY SUPPLIERS
 
     The Company's ability to conduct clinical trials on a timely basis, to
obtain regulatory approvals and to commercialize its products will depend in
part upon its ability to manufacture its products, either directly or through
third parties, at a competitive cost and in accordance with applicable FDA and
other regulatory requirements, including Good Manufacturing Practice ("GMP")
regulations. SB is responsible for the manufacture of any products developed
under its arrangement with the Company. Cephalon currently has no manufacturing
facilities of its own for clinical or commercial production of any products
under development.
 
                                        8
<PAGE>   10
 
Cephalon will need to either construct and operate facilities for these products
or will have to find other manufacturing sources.
 
     The MYOTROPHIN (rhIGF-I) currently being used in ongoing clinical trials
was produced at the Company's pilot-scale manufacturing facility in Beltsville,
Maryland (the "Beltsville Facility"). In November 1996, Cephalon sold the
Beltsville Facility. Chiron has completed a U.S. manufacturing facility (the
"Chiron Facility") to produce recombinant proteins at which the collaboration is
producing MYOTROPHIN (rhIGF-I). Once the existing inventory of material from the
Beltsville Facility has been depleted, the Chiron Facility will be the sole
source of supply for any commercial or clinical needs of MYOTROPHIN (rhIGF-I),
including any material which Cephalon may have to supply for use in Japan, as
well as for use in the Company's ongoing clinical trials. There can be no
assurance that Chiron will be able to produce adequate quantities of MYOTROPHIN
(rhIGF-I) in a cost-effective manner or, in the case of material purchased by
Cephalon for use outside the collaboration, on terms satisfactory to Cephalon.
 
     The Company and Chiron will be required to demonstrate that the material
produced from the Chiron Facility is equivalent to the material used in the ALS
clinical trials, which was manufactured at the Beltsville Facility. Although,
based on the results of a bioequivalency study, the companies believe that the
material is equivalent, if regulatory authorities do not agree with that
assessment, regulatory approval of MYOTROPHIN (rhIGF-I) could be delayed.
 
     The manufacturing facilities and operations of the Company and Chiron used
to produce MYOTROPHIN (rhIGF-I) are required to comply with all applicable FDA
requirements, including GMP regulations, and are subject to FDA inspection, both
before and after NDA approval, to determine compliance with those requirements.
The GMP regulations are complex, and failure to be in compliance could lead to
the need for remedial action, penalties and delay- in production of material
acceptable to the FDA. The Company has only limited experience in manufacturing
activities. There can be no assurance that the facilities for MYOTROPHIN
(rhIGF-I) have complied and will continue to comply with applicable
requirements. Should the Chiron Facility fail to operate for any reason or not
be able to produce sufficient quantities of MYOTROPHIN (rhIGF-I) in accordance
with applicable regulations, the collaboration would have to obtain MYOTROPHIN
(rhIGF-I) from another source. There can be no assurance that Cephalon or the
collaboration would be able to locate an alternative, cost-effective source of
supply of MYOTROPHIN (rhIGF-I).
 
     If Chiron ceases its participation in the collaboration, Cephalon, under
certain circumstances, would have the right to purchase supplies of these
products from Chiron or it could have the manufacturing technology transferred
to Cephalon on a royalty basis. There can be no assurance that supplies of
products could be obtained from Chiron on a cost-effective basis, that Cephalon
would be able to manufacture the products itself in a cost-effective manner and
without an interruption of supplies or that a suitable alternative source of
MYOTROPHIN (rhIGF-I) could be located. Failure to locate an alternative supply
of MYOTROPHIN (rhIGF-I) could result in significant costs and delays to the
program, damage the commercial prospects for MYOTROPHIN (rhIGF-I) and have a
material adverse effect on the Company. Furthermore, the Company is aware of
patents and patent applications owned by third parties that may cover certain
aspects of the collaboration's current method of manufacturing MYOTROPHIN
(rhIGF-I). See "Patents and Proprietary Technology".
 
     Kyowa Hakko Kogyo Co. Ltd. ("Kyowa Hakko") and Lafon are responsible for
manufacturing bulk compounds under the Company's respective agreement with each
company. The facilities used for manufacture of drug substance are required to
comply with all applicable FDA requirements, and are subject to FDA inspection
both before and after NDA approval. There can be no assurance that the
facilities or the material produced by Kyowa Hakko or Lafon will comply with
regulatory standards or that sufficient quantities will be available to meet the
Company's needs. If either Lafon or Kyowa Hakko were unable to supply the
Company with the applicable compound, Cephalon is permitted to make such
compound itself or to purchase it from third parties. There can be no assurance
that Cephalon would be able to manufacture any such compound, that a third-party
manufacturer could be located or that either alternative would be cost-
effective.
 
                                        9
<PAGE>   11
 
     The Company will be responsible for producing tablets or other forms of
finished product from the bulk compounds produced by Lafon and Kyowa Hakko.
There can be no assurance that a cost-effective commercial manufacturing process
can be developed. The Company has also entered into an agreement with a third
party to manufacture tablets for commercial use from bulk modafinil provided by
Lafon. There can be no assurance that such manufacturer will be able to make
sufficient quantities of tablets in accordance with appropriate FDA guidelines.
including GMP, and in a cost effective manner. Should such a manufacturer be
unable to supply tablets for any reason, there can be no assurance that the
Company would be able to identify a suitable alternative supplier at all or
without delaying the commercial launch of PROVIGIL (modafinil).
 
     Under the Company's agreement with TAP, the Company is obligated to provide
finished product for use in clinical trials and ultimately for commercial
purposes. The Company has contracted with a third-party supplier to manufacture
material for use in clinical trials. The Company has not contracted for
synthesis of product for commercial use. There can be no assurance that the
Company can contract with a facility to manufacture finished products or enter
into a suitable third-party manufacturing arrangement for its commercial needs.
 
DEPENDENCE ON COLLABORATIVE PARTNERS
 
     The Company's collaborations with Chiron, SB, Kyowa Hakko, TAP and others
provide the Company with research funding, rights to technology and development,
marketing and manufacturing resources. These arrangements are subject to certain
rights of termination by the collaborator.
 
     There can be no assurance that any funds received under these arrangements
will be sufficient, individually or in the aggregate, to cover the costs
incurred by the Company in support of the related collaborative programs.
Moreover, the amount and timing of resources to be devoted to these activities
by such partners is not within the control of the Company. There can be no
assurance that the interests of the Company will continue to coincide with those
of its collaborators or that the collaborators will not develop products
independently or with third parties which could compete with the Company's
products, or that disagreements over rights to technology or other proprietary
information will not occur. Further, there can be no assurance that the
collaborative agreements will be extended at the end of their respective terms.
If any of the Company's collaborators 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 collaborative agreement may be delayed, the Company
may be required to undertake additional responsibilities or to devote previously
unanticipated additional resources to such development or commercialization, or
such development or commercialization could be terminated. Further, termination
of the agreements could result in the loss of certain technology rights. Any
such event could adversely affect the Company.
 
LIMITED SALES AND MARKETING EXPERIENCE; UNCERTAIN PRODUCT MARKETING AND
DISTRIBUTION ARRANGEMENTS
 
     Cephalon has limited experience in the distribution, marketing and sale of
products. The Company has established a sales force in the United States which
initially is being used to co-promote Stadol NS and Serzone, approved products
of BMS, to neurologists in the United States. The co-promotion agreement expires
at the end of 1998 unless BMS and Cephalon elect to renew the arrangements.
There can be no assurance that additional products will be available for sale by
the Company's sales force or that Cephalon's sales and marketing efforts will be
successful. With respect to those products under development by Cephalon for
which it has retained marketing rights, Cephalon may choose to augment any of
its own sales efforts through sales and marketing arrangements with other
pharmaceutical companies. There can be no assurance that such marketing
arrangements will be available at all or on terms satisfactory to Cephalon or
that such arrangements will lead to the successful commercialization of
products.
 
     Cephalon does not have a sales, marketing or distribution organization
outside the United States. The Company is in the process of establishing a sales
and marketing capability focusing on neurology in certain countries in Europe.
The Company's agreement with Lafon requires the Company to commence sales and
marketing activities within three months after receiving approval to market
PROVIGIL (modafinil) in the
 
                                       10
<PAGE>   12
 
United Kingdom and the Republic of Ireland. If the Company fails to initiate
such activities within the specified time frame, its license could be terminated
by Lafon in the applicable country. There can be no assurance that the Company
will be able to establish a commercially viable sales, marketing and
distribution capability outside the United States in a timely or cost-effective
manner or at all.
 
     Under the collaborative agreement with Chiron, the Company believes that
the existing Chiron distribution infrastructure will be used for MYOTROPHIN
(rhIGF-I). The Company is evaluating alternatives for the distribution of its
other product candidates.
 
PATENTS AND PROPRIETARY TECHNOLOGIES
 
     An important part of the Company's product development strategy is to seek,
when appropriate protection for its product candidates and proprietary
technology through the use of various U.S. and foreign patents, trademarks and
contractual arrangements. The degree of the Company's success depends in part on
its ability to obtain patents, maintain trade secret protection and operate
without infringing on the proprietary rights of third parties. The Company
believes that patent protection of products or processes that may result from
the research and development efforts of the Company, its licensees or its
collaborators also is important
to the potential commercialization of the Company's product candidates. The
Company has filed various applications for U.S. and foreign patents, has
licensed various U.S. and foreign patent applications from third parties, and
owns or licenses certain U.S. and foreign patents.
 
     With regard to MYOTROPHIN (rhIGF-I), the Company believes that the
composition of rhIGF-I is in the public domain and therefore cannot be patented
under a composition-of-matter patent. Cephalon has filed patent applications in
the United States, Canada, Europe and Japan covering the use of IGF-I in the
peripheral neuropathies and other neurological disorders. The issued patents and
all patent applications relating to IGF-I in the United States, Canada and
Europe have been licensed to the Partnership.
 
     There can be no assurance that any of the Company's patent applications for
rhIGF-I uses will issue, that patents, if obtained, will be as broad in scope as
such patent applications or that the claims of any issued patents will withstand
challenge. Even in those jurisdictions where rhIGF-I is or may be covered by the
claims of a use patent, "off-label" sales by a third party might occur,
especially if another company markets rhIGF-I for other uses at a price that is
less than the price of MYOTROPHIN (rhIGF-I), thereby potentially reducing sales
of MYOTROPHIN (rhIGF-I). It is not always possible to detect "off-label" sales
and therefore enforcement of use patents can be difficult. Furthermore, some
jurisdictions outside of the United States restrict the manner in which patents
claiming uses of a product may be enforced.
 
     Under its collaboration with Chiron, Chiron has the primary responsibility
for manufacturing commercial supplies of MYOTROPHIN (rhIGF-I). The Company has
obtained a license under certain patent rights of Chiron related to rhIGF-I,
including patents and patent applications covering the manufacture of
recombinant proteins such as rhIGF-I. One of Chiron's issued patents related to
certain methods for the manufacture of recombinant proteins, including rhIGF-I,
is currently the subject of an interference proceeding before the U.S. Patent
and Trademark Office ("USPTO") involving patent applications owned by an
unrelated third party. It is not known when or how the USPTO will ultimately
conclude the interference proceeding. Another related patent application of
Chiron, which may cover the current process for manufacturing rhIGF-I, was the
subject of another interference proceeding. Chiron prevailed in the interference
proceeding and thereafter prevailed in a district court appeal brought by the
other party. That decision has been appealed to the Court of Appeals for the
Federal Circuit by the other party. There can be no assurance that Chiron will
prevail in any appeal of the decision. The Company is aware of other patents and
patent applications owned by third parties, which patents and patent
applications, if issued with the claims as filed, may cover certain aspects of
the current method of manufacturing rhIGF-I. The Company and Chiron intend to
either seek licenses under any valid patents related to the manufacturing of
rhIGF-I as required or, alternatively, modify the manufacturing process. There
can be no assurance that, if required, such licenses can be obtained at all or
on acceptable terms or that a modified manufacturing process can be implemented
at all or without substantial cost or delay. If neither approach were feasible,
the Company could be subject to a claim of patent infringement which, if
successful,
 
                                       11
<PAGE>   13
 
could prevent the Company from manufacturing or selling MYOTROPHIN (rhIGF-I) in
the United States. In such event, the Company could be materially adversely
affected.
 
     Even if patents issue on the pending applications owned or licensed by the
Company, there can be no assurance that applications filed by others will not
result in patents that would be infringed by the manufacture, use or sale of
MYOTROPHIN (rhIGF-I). The Company is aware of a published application filed
under the Paris Convention Treaty, designating the United States, that relates
to the use of IGF-I in treating certain disorders of the nervous system. The
Company believes that even if the subject matter were deemed to overlap the
subject matter of a patent application filed by the Company in the United
States, based on the filing date of the third party's application, it would not
take priority over the Company's application. Further, the Company believes that
a third party has filed a U.S. patent application which may contain a claim
which, if issued, might broadly cover the use of rhIGF-I to treat many
neurological conditions, including ALS and peripheral neuropathies. Clark &
Elbing LLP, patent counsel to the Company, has advised the Company that, in its
opinion, such a claim would not be patentable. If such a claim should issue, the
Company could be prevented from selling MYOTROPHIN (rhIGF-I) in the United
States for use in treating ALS or peripheral neuropathy unless it obtained a
license to the patent. The third-party patent application might also contain a
narrower claim covering the use of rhIGF-I to treat diabetic neuropathy. If such
a claim should issue, the Company could be prevented from selling MYOTROPHIN
(rhIGF-I) in the United States for use in treating diabetic neuropathy unless it
obtained a license to the patent. The owner of such third-party patent
application has asserted for several years that the subject matter claimed in
its application interferes with claims of the Company's patent with respect to
the use of rhIGF-l in treating ALS. Clark & Elbing LLP has advised the Company
that, in its opinion, no interference should be declared between such
third-party patent application and the Company's patent, but there can be no
assurance that the USPTO will agree with that opinion. If an interference were
declared and the third party prevailed, the Company could be prevented from
selling MYOTROPHIN (rhIGF-I) in the United States for use in treating ALS and
peripheral neuropathies unless it obtained a license to the patent. There can be
no assurance that any such licenses could be obtained from the third party at
all or on acceptable terms. Furthermore, one or more claims of the Company's
existing patent could be declared invalid.
 
     PROVIGIL (modafinil), which the Company has exclusively licensed from Lafon
for the United States, Mexico, the United Kingdom, the Republic of Ireland and
Japanese markets, is covered by the claims of a composition-of-matter patent in
the United States that expires in 1998 (under the transitional provisions of the
General Agreement on Tariffs and Trade ("GATT")). The Company may also seek an
extension of the patent under the Drug Price Competition and Patent Term
Restoration Act of 1984 (the "DPC Act") equal to one-half the period of time
elapsed between the filing of an IND for PROVIGIL (modafinil) and the filing of
the corresponding NDA, plus the period of time between the filing of the NDA for
PROVIGIL (modafinil) and FDA approval. However, to obtain the full length of any
such extension, the Company must receive FDA approval of PROVIGIL (modafinil)
before expiration of the original term of the patent. There can be no assurance
that the Company will be able to take advantage of the marketing exclusivity or
patent extension benefits of the DPC Act.
 
     No assurance can be given that any additional patents will issue on any of
the patent applications owned by the Company or licensed from third parties.
Furthermore, even if such patents issue, there can be no assurance that any
issued patents will provide protection against competitive products or otherwise
be commercially valuable, or that applications filed by others will not result
in patents that would be infringed by the manufacture, use or sale of the
Company's products. In addition, patent law relating to the scope of claims in
the biotechnology field is still evolving and the biotechnology patent rights of
the Company are subject to this additional uncertainty. There can be no
assurance that others will not independently develop similar products, duplicate
any of the Company's products, or, if patents are issued to the Company, design
around any products developed by the Company.
 
     The products of the Company could infringe the patent rights of others. If
licenses required under any such patents or proprietary rights of third parties
are not obtained, the Company could encounter delays in product market
introductions, or could find that the development, manufacture or sale of
products requiring such licenses is foreclosed. In addition, patent litigation
is both costly and time-consuming, even if the
 
                                       12
<PAGE>   14
 
outcome is favorable to the Company. In the event that the Company is a
defendant in such litigation, an adverse outcome would subject the Company to
significant liabilities to third parties, require the Company to license
disputed rights from third parties, or require the Company to cease selling its
products.
 
     The Company also relies upon trade secrets and other unpatented proprietary
information in its product development activities. All of the Company's
employees have entered into agreements providing for confidentiality and the
assignment of rights to inventions made by them while employed by the Company.
The Company also has entered into non-disclosure agreements to protect its
confidential information delivered to third parties in conjunction with possible
corporate collaborations and other purposes. There can be no assurance that
these types of agreements will effectively prevent disclosure of the Company's
confidential information.
 
PARTNERSHIP PURCHASE OPTION
 
     The Partnership has licensed to the Company the exclusive rights to
manufacture and market MYOTROPHIN (rhIGF-I) in the Territory in return for
certain royalty payments and the Milestone Payment if MYOTROPHIN (rhIGF-l)
receives regulatory approval in certain countries in the Territory. The
Milestone Payment is payable by the Company in cash, Common Stock or any
combination of the two.
 
     The Company has a contractual option to purchase all of the limited
partnership interests in the Partnership. In order to exercise the Purchase
Option, Cephalon is required to make an advance payment of $40,275,000 in cash
or, at Cephalon's election, $42,369,000 in shares of Common Stock, valued at the
market price at the time the Purchase Option is exercised. The Purchase Option
will become exercisable for a 45-day period commencing on the date which is the
earlier of (a) the date which is the later of (i) the last day of the first
month in which the Partnership shall have received Interim License payments
equal to fifteen percent (15%) of the limited partners' capital contributions
(excluding the Milestone Payment), and (ii) the last day of the 24th full month
after the date of the Company's first commercial sale, if any, of Myotrophin
within the Territory that generates a payment to the Partnership, and (b) the
last day of the 48th full month after the date of such first commercial sale, if
any, in the Territory. A payment in cash would have a significant adverse effect
on the Company's capital resources. A payment in shares of Common Stock would
result in a decrease in the percentage ownership of the Company's stockholders
at that time. If the Company were to make the Milestone Payment, exercise the
Purchase Option, or purchase additional interests outside of the Purchase
Option, a material charge to earnings could result, depending upon the
development status of the underlying technology.
 
     If the Company does not exercise the Purchase Option, its license will
terminate and all rights to manufacture or market MYOTROPHIN (rhIGF-I) in the
Territory will revert to the Partnership, which may then commercialize
MYOTROPHIN (rhIGF-I) itself or license or assign its rights to a third party.
The Company would not receive any benefits from such commercialization. There
can be no assurance that disputes will not arise between the Company and the
Partnership over the parties' respective rights to technology or their other
rights and obligations under these arrangements.
 
TECHNOLOGICAL CHANGE AND COMPETITION
 
     Competition in the Company's fields of interest from large and small
companies is intense and is expected to increase. Furthermore, academic
institutions, governmental agencies, and other public and private research
organizations will continue to conduct research, seek patent protection, and
establish collaborative arrangements for product development. Products developed
by any of these entities may compete directly with those developed by the
Company. Many of these companies and institutions have substantially greater
capital resources, research and development staffs and facilities than the
Company, and substantially greater experience in conducting clinical trials,
obtaining regulatory approvals and manufacturing and marketing pharmaceutical
products. These entities represent significant competition for the Company. In
addition, competitors developing products for the treatment of neurodegenerative
disorders might succeed in developing technologies and products that are more
effective than any being developed by the Company or that would render its
technology and products obsolete or noncompetitive. There can be no assurance
that competition
 
                                       13
<PAGE>   15
 
and innovation from these or other sources will not materially adversely affect
any sales of products which might be developed by the Company or make them
obsolete. Advances in current treatment methods may also adversely affect the
market for such products. The approval and introduction of therapeutic products
that compete with compounds being developed by the Company could also adversely
affect the Company's ability to attract and maintain patients in clinical
studies for the same indication or otherwise successfully complete its clinical
studies.
 
     With respect to MYOTROPHIN (rhIGF-I), Rilutek(R) (Riluzole) has been
approved and is being marketed by Rhone-Poulenc Rorer in the U.S. and certain
countries in Europe for the treatment of ALS. In addition, the Company believes
that other companies are developing therapeutic agents for the treatment of ALS
and peripheral neuropathies. Because the potential patient population for ALS is
limited, competition from other products may adversely affect potential sales of
MYOTROPHIN (rhIGF-I).
 
     Other companies are developing rhIGF-I as a therapeutic product for
disorders other than ALS or peripheral neuropathy, including Genentech, Inc.
which is evaluating IGF-I in diabetes. Notwithstanding the patents and patent
applications relating to MYOTROPHIN (rhIGF-I), if the sale of rhIGF-I by third
parties is approved for other indications, such products might be used in
competition with MYOTROPHIN (rhIGF-I) through "off-label" use, especially if
such product is priced below MYOTROPHIN (rhIGF-I).
 
     With respect to PROVIGIL (modafinil), there are presently several products
used in the United States to treat narcolepsy, all of which are available
generically and have been available for a number of years. There can be no
assurance that PROVIGIL (modafinil) possesses benefits over such other products,
or that the Company will be able to demonstrate the value of any such benefits
to prescribing physicians and their patients.
 
     Lafon has licensed rights to modafinil to third parties in Canada as well
as certain countries in Europe, and may license other territories to other third
parties in the future. There is no contractual requirement that the licensees
and Lafon coordinate their marketing activities related to modafinil.
Furthermore, individual reimbursement policies in each country and applicable
antitrust laws prohibit the coordination of the pricing of modafinil in various
jurisdictions. The marketing activities of the other licensees therefore may
adversely affect the Company's marketing of PROVIGIL (modafinil) in its
territories.
 
     Cephalon is marketing two proprietary products of BMS to neurologists in
the United States: Stadol NS, indicated for the management of pain, including
migraine pain; and Serzone, indicated for the treatment of depression. A number
of therapeutic agents are currently approved and are being marketed both for the
treatment of migraine and for the treatment of depression. Stadol NS also
competes directly with other pain medications, including narcotics, and
indirectly with medications approved explicitly for treatment of migraine. The
Company also believes that other products to treat migraine with a nasal spray
delivery system may be introduced into the U.S. market in 1997 and may compete
directly with Stadol NS.
 
     There are significant efforts by others, including many large
pharmaceutical companies and academic institutions, to develop therapeutic
products which may compete with the products being developed by the Company to
treat neurological disorders, including Alzheimer's disease, head and spinal
injury and stroke. Some of these products may be at a more advanced stage of
development than the Company's products.
 
LITIGATION
 
     The Company and certain of its officers have been named as defendants in a
number of civil actions filed in the U.S. District Court for the Eastern
District of Pennsylvania, which have been consolidated. Several of the
plaintiffs have been designated by the Court, collectively, as the "lead
plaintiff" for purposes of the Private Securities Litigation Reform Act of 1995.
The consolidated complaint, filed in October 1996 by the lead plaintiffs,
extended and expanded the class period to include purchasers of the Company's
securities as well as options to purchase or sell those securities during the
period between June 12, 1995 and June 7, 1996. Plaintiffs allege, based in part
on statements and opinions expressed at the June 7, 1996 meeting of the Advisory
Committee, that earlier statements by the Company about the North American and
European trial results were misleading. The plaintiffs seek unspecified damages
and other relief. The Company's motion to
 
                                       14
<PAGE>   16
 
dismiss the case is pending, and discovery related to the merits of the
allegations in the complaint has been postponed until the motion is decided. The
Company intends to vigorously defend the action. However, management believes
that it is too early in the proceedings to predict the outcome of this action
with any certainty.
 
DEPENDENCE ON KEY PERSONNEL
 
     The success of the Company depends, in large part, upon the Company's
ability to attract and retain highly qualified scientific and management
personnel. The Company faces competition for such personnel from other
companies, research and academic institutions, government entities and other
organizations. There can be no assurance that the Company will be successful in
hiring or retaining key personnel.
 
NO ASSURANCE OF ADEQUATE 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 payors 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 reform health care or 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 and the effect of any health care
reform could affect the Company's ability to sell its products and may have a
material adverse effect on the Company.
 
     There can be no assurance that reimbursement in the United States or
foreign countries will be available for any of the Company's products, or if
available, will not be decreased in the future, or that reimbursement amounts
will not reduce the demand for, or the price of, the Company's products. The
unavailability or inadequacy of third-party reimbursement for the Company's
products would have a material adverse effect on the Company. Moreover, the
Company is unable to forecast what additional legislation or regulation, if any,
relating to the health care industry or third-party coverage and reimbursement
may be enacted in the future or what effect such legislation or regulation would
have on the Company's business.
 
POTENTIAL PRODUCT LIABILITY
 
     The Company faces an inherent risk of exposure to product liability claims
if the use of its products is alleged to have resulted in an injury or adverse
effect on patients. Such risk exists with respect to products being tested in
human clinical trials, as well as products being developed by the Company, if
any, that receive regulatory approval for commercial sale. The Company maintains
product liability insurance for clinical studies. However, there can be no
assurance that such coverage will be adequate to cover claims, or that adequate
insurance coverage for future clinical or commercial activities will be
available at acceptable costs. There can be no assurance that the Company will
not experience a significant product liability claim or recall, which if
uninsured could have a material adverse effect on the Company.
 
VOLATILITY OF STOCK PRICE; NO DIVIDENDS
 
     The market price for shares of the Company's Common Stock has historically
been highly volatile. Future negative announcements concerning the Company, its
competitors or other companies in the biopharmaceutical industry, including the
results of testing and clinical trials, regulatory hearings and decisions,
technological innovations or commercial products, patents, government
regulations, developments concerning proprietary rights, litigation or public
concern as to the safety or commercial value of the Company's products may have
a significant adverse effect on the market price of the Common Stock. The
Company has not paid any cash dividends on its Common Stock and does not
anticipate paying any dividends in the foreseeable future.
 
                                       15
<PAGE>   17
 
   
     The Company believes that SBC, in connection with its sale to the Company
of Options (as defined herein), will attempt to hedge its position by
periodically buying and selling shares of the Company's Common Stock in the
over-the-counter market or otherwise, at prices then prevailing. In addition,
SBC's hedging activities may include entering into derivative instruments
relating to the Common Stock with third parties, which in turn may engage in
hedging transactions involving purchases and sales of the Common Stock. Such
purchases and sales could result in an increase in the volatility of the price
of the Company's Common Stock immediately before and during the option term. In
addition, at the expiration of the option term, SBC is expected to liquidate its
holdings of Common Stock, if any, unless the Options expire "in-the-money" and
the Company elects to settle the Options by requiring the delivery of shares of
Common Stock, rather than in cash. This liquidation could negatively affect the
market price of the Company's Common Stock.
    
 
EFFECT OF EXERCISE OF OPTIONS AND WARRANTS
 
     The Company grants stock options to employees, directors and consultants.
As of December 31, 1996, the Company had 3,181,020 outstanding options at
exercise prices ranging from $0.15 to $31.00 per share. In addition, at December
31, 1996 warrants to purchase 2,898,104 shares of Common Stock were outstanding
at exercise prices ranging from $11.32 to $18.50 per share. Options and warrants
granted represent approximately 25% of the shares of Common Stock currently
outstanding. If all or substantially all such options and warrants were
exercised, the subsequent sale of the shares of Common Stock could adversely
affect the price of the Common Stock.
 
ANTI-TAKEOVER PROVISIONS
 
     The ability of the Board of Directors of the Company to issue shares of
preferred stock without stockholder approval and a shareholder rights plan
adopted by the Company may, alone or in combination, have certain anti-takeover
effects. The Company also is subject to provisions of the Delaware General
Corporation Law which may make certain business combinations more difficult.
 
   
                                USE OF PROCEEDS
    
 
   
     The Company will not receive any proceeds from the sale of the Shares by
the Selling Stockholder.
    
 
                                       16
<PAGE>   18
 
   
               CALL OPTION TRANSACTION AND ISSUANCE OF THE SHARES
    

   
     Statements under this caption contain forward looking information within
the meaning of the Private Securities Litigation Reform Act of 1995, and should
be read in connection with cautionary statements contained thereunder and
contained in the "Risk Factors" section of this Prospectus. The following is
not intended to limit in any way the characterization of other cautionary
statements contained in this Prospectus as well as any other documents
incorporated herein or other statements by the Company.
    
 
   
GENERAL
    
 
   
     The Shares are being issued by the Company, and are being acquired by SBC,
in one or more transactions, in exchange for one or more capped call options
(the "Options") to be written by SBC on up to an aggregate of 2,500,000 shares
of Common Stock of the Company. Issuance of the Shares will be governed by an
Agreement in Regard to Premium Shares (the "Share Agreement") to be executed by
the Company, SBC and SBC Warburg. The Share Agreement is conditioned upon the
effectiveness of the Registration Statement (the "Registration Statement") of
which this Prospectus forms a part, and the Company will not issue any Shares
until after the Registration Statement has been declared effective by the
Commission. The Options will be issued pursuant to an ISDA Master Agreement,
including a Confirmation (the "Confirmation") with respect to each Option (the
"Master Agreement") to be executed by the Company and SBC following the
effectiveness of the Registration Statement. Copies of the forms of Share
Agreement and Master Agreement (including a form of Confirmation) have been
filed as exhibits to the Registration Statement, and reference is made to the
exhibits for the complete terms of these agreements. Shares are being issued to
SBC in a private placement transaction pursuant to Section 4(2) of the
Securities Act of 1933.
    
 
   
TERMS OF THE CALL OPTIONS
    
 
   
     The Company will purchase each Option from SBC and will use the Shares, in
lieu of cash, to pay the premium associated with each Option (the "Option
Price"). Payment by the Company to SBC of the Option Price within an as
yet-to-be determined number of business days after the trade date of each Option
is a condition to SBC's obligations to the Company under the Share Agreement.
The Option Price, as well as the strike price, cap price, number of shares
subject to such Option, expiration date and certain other terms of each Option,
will be determined following the effectiveness of the Registration Statement,
based upon a number of factors, including the market price of the Common Stock
when the Option is issued. Although the precise terms of the Call Options are
not yet determinable, the Company currently expects that the potential benefit
from the Call Options will be capped at between $15 and $20 per share. In
addition, the Company expects each Call Option to have a term of six months.
    
 
   
     Although at this time the Company expects that the Options will be cash
settled, the Company may elect to physically settle the Options by requiring
delivery by SBC to the Company of shares of the Common Stock. In the event that
an Option is settled in cash, SBC or its affiliates would likely sell shares of
the Common Stock, which may include some or all of the Shares, then held by them
as a hedge with respect to that Option. In the event that an Option is
physically settled, SBC will deliver shares of Common Stock to the Company,
which likely would include some or all of the Shares, upon payment by the
Company of the applicable exercise price.
    
 
   
     This Prospectus covers the resale of an assumed maximum number of Shares to
be issued by the Company in payment of the aggregate Option Price, making
certain assumptions regarding the share price of the Common Stock at the time
the Options are purchased by the Company.
    
 
   
COMPANY REASONS FOR THE OPTION TRANSACTION; RISKS TO THE COMPANY
    
 
   
     The Company intends to purchase the Options to allow the Company to
benefit, subject to the terms of the Options, from any appreciation in the
market value of the Company's Common Stock at expiration of the Options. If the
Company elects cash settlement, it will receive on exercise of each Option an
amount in cash equal to the excess of (i) an average of the market prices of the
Common Stock during a specified period prior to expiration, determined in
accordance with the Master Agreement or (ii) the cap price of the Option,
whichever is less, over the strike price of the Option. If the Company elects
stock settlement, it will receive on exercise of each Option one share of Common
Stock against payment of an amount equal to the sum of (x) the strike price of
the Option and (y) the excess, if any, of the market price of the Common Stock
at expiration over the cap price of the Option. The Company's board of directors
has determined that the purchase of the Options, in exchange for the Shares, is
an appropriate method to take advantage of any stock price appreciation.
    
 
                                       17
<PAGE>   19
 
   
     The funds received from the exercise of any Options may be used by the
Company to fund a portion of its payment obligations related to the Partnership.
If MYOTROPHIN (rhIGF-I) were to be approved for commercialization in the United
States or certain other territories, the Company is obligated to make a
$16,000,000 milestone payment to the Partnership. See "Risk Factors -- Need for
Additional Funds." In addition, at a specified time following commercialization,
the Company is required to purchase the outstanding limited partnership
interests for approximately $40,000,000 plus royalties, in order to retain its
rights to commercialize MYOTROPHIN in the United States and Europe. See "Risk
Factors -- Partnership Purchase Option."
    
 
   
     As an alternative to making these payments, the Company may seek to acquire
some or all of the remaining limited partnership interests. Although the Company
has actively discussed this possibility with the General Partner of the
Partnership, there can be no assurance that any agreement can be reached with
the General Partner to acquire the limited partnership interests. Even if an
agreement can be reached, the Company estimates that to reach an agreement the
purchase price could be significant, possibly in the $125 million range. In
addition to using the proceeds, if any, from the Options, the Company would
explore one or more additional financing alternatives, after the May 8th meeting
of the Advisory Committee, if it were to proceed with an acquisition of limited
partnership interests.
    
 
   
     Any funds received from the exercise of any Options that are not used to
fund the Company's obligations related to the Partnership would be used to fund
the research and development activities of the Company and the acquisition of
technologies, and for other general corporate purposes.
    

   
     Any purchase of Options by the Company involves certain risks.
Particularly, as described above, the purchase of an Option will benefit the
Company only if the market price of the Common Stock appreciates to a level
above the strike price of the Option during the term of such Option and remains
at such level at the expiration of the Option. If the market price of the Common
Stock at expiration of an Option does not exceed such Option's strike price, the
Company will have sold Shares for a consideration which, at expiration of the
Option, has no value. If the market price of the Common Stock at expiration of
an Option exceeds such Option's strike price, but by less than the premium for
such Option, the Company will have issued Shares for a consideration which, at
the expiration of such Option, is worth less than the market value of the Shares
when they were sold. The benefit to the Company would, in each case, be affected
by applicable transaction costs. In any event, the number of the Company's
issued and outstanding shares of Common Stock will increase by the 500,000
Shares, representing a dilution of approximately 2% based on the number of
shares of Common Stock currently outstanding.
    
 
   
     One near-term event that is expected to directly affect the value of the
Options is the scheduled meeting of the FDA's Peripheral and Central Nervous
System Drugs Advisory Committee (the "Advisory Committee") on May 8, 1997. See
"Risk Factors -- Uncertainties Related to MYOTROPHIN (rhIGF-I) Phase III
Regulatory Submissions." The Company has not received any indication as to the
outcome of the Advisory Committee meeting or any subsequent FDA decision on the
NDA. If the Advisory Committee recommends approval of MYOTROPHIN (rhIGF-I) and
if the FDA subsequently approves the commercialization of the product, the
market price of the Company's Common Stock may increase, in which case the
Company could realize a financial benefit from the Options. If the Advisory
Committee does not recommend approval of the NDA or if the FDA does not approve
the NDA, the price of the Common Stock is likely to decrease and the Options
will have no value.
    
 
   
     Because the Option financing is innovative and is structured to take
advantage of increases in the price of the Company's Common Stock, there is a
risk that a third party could assert that the Company has not fully complied
with its applicable disclosure obligations. Although the Company believes that
it has complied with its obligations under applicable securities laws, there can
be no assurance that such a claim will not be asserted. Defense of any such
claim could be costly to the Company and there can be no assurance that any such
defense would be successful.
    
 
   
    
 
 
                                       18
<PAGE>   20
 
   
                              SELLING STOCKHOLDER
    
 
   
     The following table sets forth certain information regarding the beneficial
ownership of the Common Stock of the Selling Stockholder and as adjusted to give
effect to the sale of the Shares offered hereby. The Shares are being registered
to permit public secondary trading of the Shares, and the Selling Stockholder
may offer the Shares for resale from time to time. See "Plan of Distribution."
    
 
   
     The Shares being offered hereby by the Selling Stockholder may be acquired,
from time to time, as described above under "Call Option Transaction and
Issuance of the Shares."
    
 
   
     In recognition of the fact that the Selling Stockholder wishes to be
legally permitted to sell its Shares when it deems appropriate, the Company has
filed with the Commission, under the Securities Act, a Registration Statement on
Form S-3, of which this Prospectus forms a part, with respect to the resale of
the Shares from time to time on the Nasdaq National Market of The Nasdaq Stock
Market or in privately-negotiated transactions and has agreed to prepare and
file such amendments and supplements to the Registration Statement as may be
necessary to keep the Registration Statement effective until the Shares are no
longer required to be registered for the sale thereof by the Selling
Stockholder.
    
 
   
<TABLE>
<CAPTION>
                                                                                    BENEFICIAL OWNERSHIP
                                                                      NUMBER OF        AFTER OFFERING
                                                NUMBER OF SHARES       SHARES       ---------------------
                   NAME OF                     BENEFICIALLY OWNED       BEING       NUMBER OF
             SELLING STOCKHOLDER               PRIOR TO OFFERING       OFFERED       SHARES       PERCENT
- ---------------------------------------------  ------------------     ---------     ---------     -------
<S>                                            <C>                    <C>           <C>           <C>
Swiss Bank Corporation, London Branch........        500,000(1)        500,000(1)       0           --%
</TABLE>
    
 
- ---------------
   
(1) Represents an assumed maximum number of Shares to be issued by the Company
    in payment of the aggregate price of the Options, making certain assumptions
    regarding the share price of the Common Stock at the time the Options are
    purchased by the Company.
    
 
                                       19
<PAGE>   21
 
                              PLAN OF DISTRIBUTION
 
   
     The Shares may be sold from time to time by SBC, or by transferees or
successors in interest, including one or more affiliates of SBC. SBC plans to
sell the Shares principally to or through SBC Warburg, a registered
broker-dealer that is a wholly-owned subsidiary of Swiss Bank Corporation. SBC
Warburg may sell Shares directly or to or through unaffiliated brokers and
dealers, and SBC Warburg and such other brokers and dealers may receive
compensation from SBC or SBC Warburg, as the case may be, in the form of
discounts, concessions or commissions (which compensation is not expected to be
in excess of customary amounts). Such sales may be made in the over-the-counter
market or otherwise at prices then prevailing, or in negotiated transactions.
    
 
   
     SBC has advised the Company that it may from time to time engage in
transactions to hedge all or part of its risk relating to the Options. Such
hedging activities, which will not take place prior to effectiveness of the
Registration Statement, may include the sale or the retention by SBC or its
affiliates of all or a portion of the Shares and purchases and sales, including
short sales, in the over-the-counter market or otherwise of other shares of
Common Stock and may include entering into derivative instruments with third
parties relating to the Common Stock, such as options and equity swaps, which
third parties may in turn may engage in hedging transactions.
    
 
   
     Upon exercise by the Company of the Options, the Company may elect to
receive shares of Common Stock. See "Call Option Transaction and Issuance of the
Shares." In such event, all or a portion of the Shares may, to the extent they
are still held by SBC, be transferred by SBC to the Company in satisfaction of
such exercise.
    
 
     SBC, SBC Warburg and any dealers through whom sales of the Shares may be
made may be deemed to be "underwriters" within the meaning of the Securities
Act, and commissions or discounts and other compensation received by them may be
regarded as underwriters' compensation.
 
     The Company has agreed to indemnify SBC and SBC Warburg against certain
liabilities, including liabilities under the Securities Act, and to contribute
to payments SBC or SBC Warburg may be required to make in respect thereof.
 
                                 LEGAL MATTERS
 
     The validity of the Common Stock offered hereby will be passed upon for the
Company by Morgan, Lewis & Bockius LLP, Philadelphia, Pennsylvania.
 
                                    EXPERTS
 
     The financial statements incorporated by reference in this Prospectus have
been audited by Arthur Andersen LLP, independent public accountants, as
indicated in their report with respect thereto, and are incorporated by
reference herein in reliance upon the authority of said firm as experts in
giving said reports.
 
                                       20
<PAGE>   22
 
======================================================
 
NO DEALER, SALESMAN OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION
OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS
AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED
UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY TO ANY PERSON
IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION WOULD BE UNLAWFUL OR TO
ANY PERSON TO WHOM IT IS UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR
ANY OFFER OR SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY OR THAT
INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE
HEREOF.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Available Information.................    2
Incorporation of Certain Documents by
  Reference...........................    2
The Company...........................    4
Risk Factors..........................    4
Use of Proceeds.......................   16
Call Option Transaction and Issuance
  of the Shares.......................   17
Selling Stockholder...................   19
Plan of Distribution..................   20
Legal Opinion.........................   20
Experts...............................   20
</TABLE>
    
 
======================================================
======================================================
 
                                 500,000 SHARES
 
                                 CEPHALON, INC.
 
                                  COMMON STOCK
                          ---------------------------
 
                                   PROSPECTUS
                          ---------------------------
                                          , 1997
======================================================
<PAGE>   23
 
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table shows the estimated expenses of the issuance and
distribution of the securities offered hereby:
 
<TABLE>
    <S>                                                                              <C>
    Securities and Exchange Commission Registration Fee..........................    $ 2,832
    Legal Fees and Expenses......................................................     25,000
    Nasdaq Listing Fees..........................................................     10,000
    Miscellaneous................................................................      5,000
                                                                                     -------
    Total........................................................................    $42,832
                                                                                     =======
</TABLE>
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145 of the Delaware General Corporation Law ("Section 145") permits
indemnification of directors, officers, agents and controlling persons of a
corporation under certain conditions and subject to certain limitations. Article
VII of the Registrant's Bylaws, requires the Registrant to indemnify directors
and officers of the Registrant or any other authorized representative against
expenses, judgments and any settlement amounts incurred in a third party
proceeding brought by reason of the fact that the person is an authorized
representative of the Registrant. The Bylaws also permit indemnification of
expenses incurred by an authorized representative in connection with a
proceeding brought in the name of the corporation. The Bylaws further specify
procedures for such indemnification. Section 145 also empowers the Registrant to
purchase and maintain insurance that protects its officers, directors, employees
and agents against any liabilities incurred in connection with their service in
such positions.
 
ITEM 16.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND INDEX TO SUCH EXHIBITS AND
          SCHEDULES
 
     The exhibits filed as part of this registration statement are as follows:
 
   
<TABLE>
<CAPTION>
    EXHIBIT
    NUMBER                                      DESCRIPTION
    ------     ------------------------------------------------------------------------------
    <C>        <S>
    5.1**      Opinion of Morgan, Lewis & Bockius LLP regarding legality of securities being
               registered.
    10.1*      Form of ISDA Master Agreement by and between the Registrant and Swiss Bank
               Corporation, London Branch, together with form of Schedule thereto.
    10.2**     Form of Confirmation to be entered into pursuant to ISDA Master Agreement by
               and between the Registrant and Swiss Bank Corporation, London Branch.
    10.3**     Form of Agreement in Regard to Premium Shares by and among the Registrant,
               Swiss Bank Corporation, London Branch and SBC Warburg Inc.
    23.1**     Consent of Morgan, Lewis & Bockius LLP (included in its opinion filed as
               Exhibit 5.1 hereto).
    23.2**     Consent of Arthur Andersen LLP
    23.3*      Consent of Clark & Elbing LLP
    24.1*      Powers of Attorney (included on the signature page).
</TABLE>
    
 
- ---------------
   
 * Previously filed.
    
 
   
** Filed herewith.
    
 
ITEM 17.  UNDERTAKINGS
 
     The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
                                      II-1
<PAGE>   24
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to its Certificate of Incorporation, its Bylaws, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against a public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
     The undersigned Registrant hereby undertakes:
 
           (1)  To file, during any period in which offers or sales are being
     made, a post-effective amendment to this registration statement:
 
        (i)   To include any prospectus required by section 10(a)(3) of the
        Securities Act of 1933;
 
        (ii)  To reflect in the prospectus any facts or events arising after the
        effective date of the registration statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the registration statement;
 
        (iii) To include any material information with respect to the plan of
        distribution not previously disclosed in the registration statement or
        any material change to such information in the registration statement;
 
     Provided, however, that paragraph (1)(i) and (1)(ii) do not apply if the
     registration statement is on Form S-3 or Form S-8, and the information
     required to be included in a post-effective amendment by those paragraphs
     is contained in periodic reports filed by the registrant pursuant to
     section 13 or section 15(d) of the Securities Exchange Act of 1934 that are
     incorporated by reference in the registration statement.
 
           (2)  That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
           (3)  To remove from registration by means of a post-effective
     amendment any of the securities being registered which remain unsold at the
     termination of the offering.
 
                                      II-2
<PAGE>   25
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1 to
the Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of West Chester, Commonwealth of
Pennsylvania on the 1st day of May, 1997.
    
 
                                          CEPHALON, INC.
 
                                          By:   /s/ FRANK BALDINO, JR., PH.D.
                                            ------------------------------------
                                                Frank Baldino, Jr., Ph.D.
                                                  Director, President and Chief
                                                Executive Officer
 
   
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to the Registration Statement has been signed by the following persons and
by Frank Baldino, Jr. as attorney-in-fact for the specified persons in the
capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                NAME                                     TITLE                        DATE
- -------------------------------------  ------------------------------------------ ------------
<C>                                    <S>                                        <C>
    /s/ FRANK BALDINO, JR., PH.D.      Director, President and Chief Executive    May 1, 1997
- -------------------------------------  Officer (Principal Executive Officer)
      Frank Baldino, Jr., Ph.D.
              
                  *                    Director, Executive Vice President and     May 1, 1997
- -------------------------------------  Chief Operating Officer
          Bruce A. Peacock
 
                  *                    Director                                   May 1, 1997
- -------------------------------------
           William P. Egan
 
                  *                    Director                                   May 1, 1997
- -------------------------------------
       Robert J. Feeney, Ph.D.
 
                  *                    Director                                   May 1, 1997
- -------------------------------------
         Martyn D. Greenacre
 
                  *                    Director                                   May 1, 1997
- -------------------------------------
           Kevin E. Moley
 
                  *                    Director                                   May 1, 1997
- -------------------------------------
       Horst Witzel, Dr.-Ing.
 
                  *                    Senior Vice President, Finance and Chief   May 1, 1997
- -------------------------------------  Financial Officer (Principal
           J. Kevin Buchi              Financial and Accounting Officer)
 
 *By: /s/ FRANK BALDINO, JR., PH.D.
- -------------------------------------
      Frank Baldino, Jr., Ph.D.
          Attorney-in-Fact
</TABLE>
    
<PAGE>   26
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
    EXHIBIT NUMBER                                DOCUMENT                                   PAGE
    --------------  ---------------------------------------------------------------------    ----
    <C>             <S>                                                                      <C>
         5.1**      Opinion of Morgan, Lewis & Bockius LLP regarding legality of
                    securities being registered
         10.1*      Form of ISDA Master Agreement by and between the Registrant and Swiss
                    Bank Corporation, London Branch, together with form of Schedule
                    thereto.
        10.2**      Form of Confirmation to be entered into pursuant to ISDA Master
                    Agreement by and between the Registrant and Swiss Bank Corporation,
                    London Branch.
        10.3**      Form of Agreement in Regard to Premium Shares by and among the
                    Registrant, Swiss Bank Corporation, London Branch and SBC Warburg
                    Inc.
        23.1**      Consent of Morgan, Lewis & Bockius LLP (included in its opinion filed
                    as Exhibit 5.1 hereto)
        23.2**      Consent of Arthur Andersen LLP
         23.3*      Consent of Clark & Elbing LLP
         24.1*      Powers of Attorney (included on the signature page)
</TABLE>
    
 
- ---------------
   
 * Previously filed.
    
 
   
** Filed herewith.
    

<PAGE>   1
                                                                     Exhibit 5.1


                           Morgan, Lewis & Bockius LLP
                                Counselors at Law
                              2000 One Logan Square
                      Philadelphia, Pennsylvania 19103-6993
                            Telephone: (215) 963-5000
                               Fax: (215) 963-5299





May 1, 1997

Cephalon, Inc.
145 Brandywine Parkway
West Chester, Pennsylvania 19380

Re:      Cephalon, Inc.
         Registration Statement on Form S-3

Ladies and Gentlemen:

We have acted as counsel to Cephalon, Inc., a Delaware corporation (the
"Company"), in connection with the preparation of a registration statement on
Form S-3 (the "Registration Statement") filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended (the "Act"), relating to
the public offering of an aggregate of 500,000 shares (the "Shares") of the
common stock, par value $.01 per share, of the Company (the "Common Stock").

In this connection, we have reviewed (a) the Registration Statement; (b) the
Company's Restated Certificate of Incorporation and Bylaws; (c) the form of
Agreement in Regard to Premium Shares, filed as Exhibit 10.3 to the Registration
Statement, to be executed by the Company and Swiss Bank Corporation, London
Branch and SBC Warburg, Inc. (the "Share Agreement") and; (e) certain records of
the Company's corporate proceedings as reflected in its minute books. In our
examination, we have assumed the genuineness of all signatures, the authenticity
of all documents submitted to us as originals and the conformity with the
original of all documents submitted to us as copies thereof.

Our opinion set forth below is limited to the General Corporation Law of the
State of Delaware.

In our opinion, the Shares, when, and to the extent, they are issued as
described in the Registration Statement and pursuant to the terms of the Share
Agreement, will be legally issued, fully paid and non-assessable.

We hereby consent to the use of this opinion as Exhibit 5.1 to the Registration
Statement and to all references to our firm in the Registration Statement. In
giving such consent, we do not thereby


<PAGE>   2
Cephalon, Inc.
May 1, 1997
Page 2

admit that we are acting within the category of persons whose consent is
required under Section 7 of the Act and the rules and regulations of the
Securities and Exchange Commission thereunder.

Very truly yours,


/s/ MORGAN, LEWIS & BOCKIUS LLP



<PAGE>   1
                                                                    Exhibit 10.2

                              FORM OF CONFIRMATION


Date:

To:               Cephalon, Inc. ("Party B")

Attention:

From:             Swiss Bank Corporation, London Branch ("Party A")

Re:               Equity Option Confirmation
                  Reference Number ____________

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

The purpose of this communication is to confirm the terms and conditions of the
transaction (the "Transaction") to be entered into between us on the Trade Date
specified below.

This Confirmation constitutes a "Confirmation" as referred to in the 1992 ISDA
Master Agreement specified below. The definitions and provisions contained in
the 1991 ISDA Definitions (as published by the International Swaps and
Derivatives Association, Inc. (formerly known as the International Swap Dealers
Association, Inc.) ("ISDA")) are incorporated into this Confirmation. In the
event of any inconsistency between those definitions and provisions and this
Confirmation, this Confirmation will govern.

This Confirmation supplements, forms part of, and is subject to, the ISDA Master
Agreement dated as of _________, 1997, as amended and supplemented from time to
time (the "Agreement"), between you and us. All provisions contained in the
Agreement govern this Confirmation except as expressly modified below.

The terms of the Transaction to which this Confirmation relates are as follows:

Trade Date          :

Buyer               :     Party B

Seller              :     Party A

Option Style        :     European Option

Option Type         :     Capped Call

Shares              :     Common Stock of Cephalon, Inc.  (Symbol: CEPH)

Number of Options   :

Contract Multiplier :     1.00
<PAGE>   2
Notional Amount     :     USD

Strike Price        :     USD

Cap Price           :     USD

Trade Price         :     [to be determined]

Total Premium       :     A number (rounded to the nearest whole Share) of
                          Shares (the "Premium Shares"), determined by the
                          Calculation Agent in accordance with the following
                          formula: [to be determined]

                          The Premium Shares are subject to the Agreement in
                          Regard to Premium Shares dated as of ________, 1997
                          between Party A, Party B and SBC Warburg Inc.

Premium
Payment Date        :     ____ Exchange Business Days after the Trade Date.

Expiration Date     :     ___________, or, if that date is not an Exchange
                          Business Day, the following day that is an Exchange
                          Business Day.

Currency
Business Day        :     Any day on which commercial banks are open for
                          business (including dealings in foreign exchange and
                          foreign currency deposits) in the cities from which
                          and in which a payment is to be made.

Exchange
Business Day        :     A day that is (or but for the occurrence of a Market
                          Disruption Event, would have been) a trading day on
                          the Exchange and the American Stock Exchange (other
                          than a day on which trading on any such exchange is
                          scheduled to close prior to its regular weekday
                          closing time, first announced on the day of such
                          closing).

Normal
Trading Day         :     An Exchange Business Day on which no Market Disruption
                          Event has occurred or is continuing.

Market
Disruption Event    :     The occurrence or existence on any Exchange Business
                          Day during the one-half hour period that ends at the
                          close of

                                       2
<PAGE>   3
                          business of any suspension of or limitation imposed on
                          trading (by reason of movements in price exceeding
                          levels permitted by the relevant exchange or
                          otherwise), provided that any such event is material
                          in the joint determination of the parties, on: (i) the
                          Exchange in the Shares; or (ii) the American Stock
                          Exchange in options contracts on the Shares.

Exchange            :     NASDAQ National Market System

Clearance System
Business Day        :     Any day on which the Clearance System is open for the
                          acceptance and execution of settlement instructions.

Clearance System    :     Depository Trust Company, or any successor to or
                          transferee of such clearance system.

Calculation Agent   :     Party A, whose calculations shall be binding absent
                          manifest error.

Procedure for Exercise
- ----------------------

Exercise Date       :     The Expiration Date.

Expiration Time     :     5:00 p.m. local time in New York City

Automatic Exercise  :     The Transaction will be deemed to be automatically
                          exercised if it is In-the-Money on the Expiration
                          Date, unless (i) the Buyer has notified the Seller (by
                          telephone or in writing) prior to 5:00 p.m. local time
                          in New York City on the Expiration Date that it does
                          not wish to exercise the Transaction; or (ii) the
                          Closing Value cannot be determined on the Expiration
                          Date. If the Transaction is to be cash settled,
                          "In-the-Money" means that the Cash Settlement Amount
                          is greater than zero. If the Transaction is to be
                          physically settled, "In-the-Money" means that the
                          Closing Value is greater than the Strike Price.
                          "Closing Value" means the closing price of the Shares,
                          as reported on the Exchange, on the Expiration Date.

Seller's telephone
or facsimile number
for purposes of
giving notice       :     Telephone:
                          Fax:
                          Attention:



                                       3
<PAGE>   4
Settlement Terms
- ----------------

Settlement          :     The Transaction will be cash settled; provided,
                          however, that Party B may elect to physically settle
                          the Transaction by giving notice to Party A no later
                          than 30 Exchange Business Days before the Expiration
                          Date.

Physical Settlement :     If the Transaction is to be physically settled, on the
                          Settlement Date, the Seller shall deliver to the Buyer
                          the number of Shares equal to the Contract Multiplier
                          multiplied by the number of Options exercised against
                          payment by the Buyer to the Seller of an amount equal
                          to the product of (a) the Strike Price, adjusted as
                          hereinafter provided, multiplied by (b) the Contract
                          Multiplier multiplied by (c) the number of Options
                          exercised. If the Closing Value exceeds the Cap Price,
                          the Strike Price shall be increased by the amount by
                          which the Closing Value exceeds the Cap Price; if the
                          Closing Value is equal to or less than the Cap Price,
                          no adjustment will be made to the Strike Price. Such
                          payment and such delivery will be made through the
                          Clearance System at the accounts specified below, on a
                          delivery versus payment basis.

Cash Settlement     :     If the Transaction is to be cash settled, on the
                          Settlement Date, Party A shall pay to Party B the Cash
                          Settlement Amount, if any. The "Cash Settlement
                          Amount" shall be the greater of (a) zero and (b) an
                          amount calculated by the Calculation Agent equal to
                          (i) the Contract Multiplier multiplied by (ii) the
                          number of Options exercised multiplied by (iii) the
                          Price Differential. "Price Differential" means (x) if
                          the Reference Price exceeds the Cap Price, the result
                          of subtracting the Strike Price from the Cap Price,
                          and (y) if the Reference Price is equal to or less
                          than the Cap Price, the result of subtracting the
                          Strike Price from the Reference Price.

Reference Price     :     (a) If the Valuation Period contains 15 Normal Trading
                          Days, the Reference Price shall be the arithmetic
                          average of the Share Prices on those 15 Normal Trading
                          Days.

                          (b) If the Valuation Period does not contain 15 Normal
                          Trading Days, the parties shall jointly determine the
                          Share Price for the Valuation Date and as many
                          Exchange Business Days immediately preceding the
                          Valuation Date as shall be necessary, when such Share
                          Prices are taken together with the


                                       4
<PAGE>   5


                          Share Prices on all Normal Trading Days occurring
                          within the Valuation Period, to provide 15 Share
                          Prices, and in such case the Reference Price shall be
                          the arithmetic average of those 15 Share Prices.

Share Price         :     [to be determined]

Valuation Period    :     The period from and including the fourteenth Exchange
                          Business Day immediately preceding the Expiration Date
                          (the "Initial Date") to and including the Expiration
                          Date, provided that if any Exchange Business Day in
                          the Valuation Period as so determined, shall not be a
                          Normal Trading Day, the Valuation Period shall be
                          extended so that the Valuation Period includes 15
                          Normal Trading Days, but in no event shall the last
                          day of the Valuation Period be later than the tenth
                          Exchange Business Day after the Expiration Date, and
                          in no event shall the Valuation Period include any day
                          before the Initial Date.

Valuation Date      :     The last day of the Valuation Period.

Settlement Date     :     If the Transaction is to be cash settled, the
                          Settlement Date shall be three Currency Business Days
                          after the Valuation Date. If the Transaction is to be
                          physically settled, the Settlement Date shall be three
                          Clearance System Business Days after the Exercise
                          Date.

Adjustment Events
- -----------------

Adjustments         :     During the life of the Transaction, if any adjustment
                          is made by The Options Clearing Corporation or its
                          successors ("OCC") in the terms of outstanding
                          OCC-issued options ("OCC Options") on the Shares which
                          are the subject of the Transactions, an equivalent
                          adjustment shall be made in the terms of the
                          Transaction. Except as provided in the following
                          paragraph, no adjustment shall be made in the terms of
                          the Transaction for any event that does not result in
                          an adjustment to the terms of outstanding OCC Options
                          on the Shares. Without limiting the generality of the
                          foregoing, NO ADJUSTMENT SHALL BE MADE IN THE TERMS OF
                          THE TRANSACTIONS FOR ORDINARY CASH DIVIDENDS ON THE
                          SHARES.

                          If at any time during the life of the Transaction
                          there shall be no outstanding OCC Options on the
                          Shares, and an event shall


                                       5
<PAGE>   6
                          occur for which an adjustment might otherwise be made
                          under the By-Laws, Rules, and stated policies of the
                          OCC applicable to the adjustment of OCC Options (the
                          "OCC Adjustment Rules"), the parties shall use their
                          best efforts, applying the principles set forth in the
                          OCC Adjustment Rules, to jointly determine whether to
                          adjust the terms of the Transaction and the nature of
                          any such adjustment.

Miscellaneous
- -------------

Transfer            :     Neither party may transfer the Transaction, in whole
                          or in part, without the prior written consent of the
                          non-transferring party.

Account Details
- ---------------

Payments and deliveries to Party A:

     Account for payments:

     Delivery instructions:

Payments and deliveries to Party B:

     Account for payments:

     Delivery instructions:



                                       6
<PAGE>   7
Please confirm that the foregoing correctly sets forth the terms of our
agreement by executing the copy of this Confirmation enclosed for that purpose
and returning it to us or by sending to us a letter or telex substantially
similar to this letter, which letter or telex sets forth the material terms of
the Transaction to which this Confirmation relates and indicates your agreement
to those terms.

Yours sincerely,

SWISS BANK CORPORATION, LONDON BRANCH


By: ______________________               By: _____________________
Name:                                    Name:
Title:                                   Title:



Confirmed as of the ___ day
of ____________, 1997

CEPHALON, INC.



By:  __________________________________
Name:
Title:

                                       7

<PAGE>   1
                                                                    Exhibit 10.3


                      AGREEMENT IN REGARD TO PREMIUM SHARES

         This Agreement in Regard to Premium Shares (this "Agreement"), dated as
of May __, 1997, is entered into by and among Cephalon, Inc. ("Issuer"), Swiss
Bank Corporation, London Branch ("Seller") and SBC Warburg Inc., a registered
U.S. broker-dealer ("Selling Agent"; Seller and Selling Agent are sometimes
referred to collectively herein as the "Sellers").

         WHEREAS, Issuer intends to purchase from Seller (although being under
no obligation to do so), and Seller intends to sell to Issuer upon Issuer's
request (although being under no obligation to do so) up to five capped call
options (the "Call Options") on up to 2,500,000 shares, in the aggregate, of
Issuer's common stock ("Issuer Common Stock") on terms and at times to be
arranged (any such transaction being hereinafter referred to as a "Call Option
Transaction");

         WHEREAS, Issuer and Seller intend to enter into an ISDA Master
Agreement to which any Call Option Transactions will be subject (the "Master
Agreement") and to document the particular terms of each Call Option Transaction
by means of a confirmation (each a "Confirmation");

         WHEREAS, Issuer wishes to pay to Seller the premiums for the Call
Options in the form of up to 500,000 shares of Issuer Common Stock (the "Premium
Shares"), and Seller is willing to accept payment in such form, but only if
under applicable law Seller is able to offer and sell the Premium Shares to the
public in the United States in market transactions on a continuous or delayed
basis, using Selling Agent as its selling agent (all such offers and sales
collectively, the "Offering") and certain other conditions are met; and

         WHEREAS, to enable Seller to conduct the Offering in compliance with
applicable law, Issuer is willing to register the Premium Shares under the
Securities Act of 1933, as amended (such act together with the rules and
regulations thereunder collectively, the "Act") as a shelf registration pursuant
to Rule 415 thereunder, and to maintain such registration in effect during the
Prospectus Delivery Period (as defined below);

         NOW, THEREFORE, in consideration of the premises and other good and
valuable consideration, the receipt and sufficiency of which is acknowledged,
the parties hereto agree as follows:

1. REGISTRATION STATEMENT AND PROSPECTUS.

         Issuer has prepared and filed with the Securities and Exchange
Commission (the "Commission") in accordance with the provisions of the Act, a
registration statement on Form S-3 (No. 333-24793) under the Act, including a
prospectus subject to completion relating to the Premium Shares, in respect of
the Offering. The term "Registration Statement" as used in this Agreement means
such registration statement (including all financial schedules and exhibits), as
amended or supplemented. The term "Prospectus" as used in this Agreement means
the prospectus in the form included in the Registration Statement at the time it
became effective, or, if a prospectus is filed with the Commission pursuant to
Rule 424(b) under the Act, the term "Prospectus" as used in this Agreement means
the prospectus in the form included in the Registration Statement at the time it
became effective, as supplemented by the prospectus filed with the Commission
pursuant to Rule 424(b), in either case together with any post-effective


<PAGE>   2
amendments thereto and Prospectus Supplements prepared and filed with the
Commission from time to time. Any reference in this Agreement to the
Registration Statement or the Prospectus shall be deemed to refer to and include
the documents incorporated by reference therein pursuant to Item 12 of Form S-3
under the Act, as of the date of the Registration Statement or the Prospectus,
as the case may be, and any reference to any amendment or supplement to the
Registration Statement or the Prospectus shall be deemed to refer to and include
any documents filed after such date under the Securities Exchange Act of 1934,
as amended, and the rules and regulations of the Commission thereunder
(collectively, the "Exchange Act") which, upon filing, are incorporated by
reference therein, as required by paragraph (b) of Item 12 of Form S-3. As used
herein, the term "Incorporated Documents" means the documents which at the time
are incorporated by reference in the Registration Statement, the Prospectus, or
any amendment or supplement thereto.

2. ENTRY INTO AND CONSUMMATION OF CALL OPTION TRANSACTIONS.

         If the parties enter into any Call Option Transaction, the relevant
Call Option will be effective on the trade date as set forth in the relevant
Confirmation or on such later date as may be specified in the Confirmation (the
"Effective Date"), subject to Issuer's tender of delivery of the required number
of Premium Shares on the premium payment date as set forth in the relevant
Confirmation (the "Premium Payment Date") and satisfaction of, or waiver by
Seller of, the conditions set forth in Section 7 hereof. If all such conditions
are satisfied on the Premium Payment Date, Seller shall accept Issuer's tender
of delivery. The Call Option Transaction shall be consummated when and only when
Seller accepts Issuer's tender of delivery and Issuer has delivered the Premium
Shares to Seller in accordance with Seller's instructions.

3. AGREEMENTS OF ISSUER.

         Issuer agrees with Seller as follows:

         (a) Issuer shall advise Seller promptly and, if requested by Seller,
shall confirm such advice in writing: (i) of any request by the Commission for
amendment of or a supplement to the Registration Statement or the Prospectus or
for additional information; (ii) of the issuance by the Commission of any stop
order suspending the effectiveness of the Registration Statement or of the
suspension of qualification of the Premium Shares for offering or sale in any
jurisdiction or the initiation of any proceeding for such purpose; and (iii)
during the Prospectus Delivery Period (as defined in subsection (d) below), of
any change in Issuer's condition (financial or other), business, prospects,
properties, net worth or results of operations, or of the happening of any
event, which makes any statement of a material fact made in the Registration
Statement or the Prospectus (as then amended or supplemented) untrue or which
requires the making of any additions to or changes in the Registration Statement
or the Prospectus (as then amended or supplemented) in order to state a material
fact required by the Act to be stated therein or necessary in order to make the
statements therein not misleading, or of the necessity to amend or supplement
the Prospectus (as then amended or supplemented) to comply with the Act or any
other law. If at any time during the Prospectus Delivery Period the Commission
shall issue any stop order suspending the effectiveness of the Registration
Statement, Issuer shall make every reasonable effort to obtain the withdrawal of
such order at the earliest possible time.

         (b) Issuer shall furnish to Seller without charge (i) four signed
copies of the Registration Statement as originally filed with the Commission and
of each amendment thereto, including financial statements and all exhibits
thereto, (ii) such number of conformed copies of the Registration Statement as
originally filed and of each amendment thereto, 


                                        2

<PAGE>   3
but without exhibits, as Seller may request, (iii) such number of copies of the
Incorporated Documents, without exhibits, as Seller may request, and (iv) one
copy of the exhibits to the Incorporated Documents.

         (c) Issuer shall not file any amendment to the Registration Statement
or make any amendment or supplement to the Prospectus of which Seller shall not
previously have been advised or to which, after Seller shall have received a
copy of the document proposed to be filed, Seller shall reasonably object. Until
the end of the Prospectus Delivery Period (as defined in subsection (d) below),
Issuer shall provide a copy to Seller, upon or substantially contemporaneously
with its filing, of any document which upon filing becomes an Incorporated
Document.

         (d) As soon after the execution and delivery of this Agreement as
possible and thereafter from time to time for such period as in the opinion of
counsel to Seller a prospectus is required by the Act to be delivered in
connection with sales of Premium Shares by Sellers (the "Prospectus Delivery
Period"), Issuer shall expeditiously deliver to Sellers, without charge until
one year after the expiration by its terms of the last Call Option to expire, as
many copies of the Prospectus (and of any amendment or supplement thereto) as
Sellers may request. Issuer consents to the use of the Prospectus (and of any
amendment or supplement thereto) in accordance with the provisions of the Act
and with the securities or Blue Sky laws of the jurisdictions in which the
Premium Shares are offered by Sellers and by all dealers to whom Premium Shares
may be sold. If during the Prospectus Delivery Period any event shall occur that
in the judgment of Issuer or in the opinion of counsel to Seller is required to
be set forth in the Prospectus (as then amended or supplemented) or should be
set forth therein in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading, or if it is necessary
to supplement or amend the Prospectus, or to file under the Exchange Act any
document which, upon filing, becomes an Incorporated Document, in order to
comply with the Act or any other law, Issuer shall forthwith notify Sellers and
prepare and, subject to the provisions of subsection (c) above, file an
appropriate supplement or amendment to the Prospectus, or file such document,
with the Commission and shall expeditiously furnish to Sellers such reasonable
number of copies thereof as Sellers may request. (The period of time from the
receipt of such notice by Sellers until receipt by Sellers of such supplement or
amendment, or until the filing of such document with the Commission, as the case
may be, is hereinafter referred to as a "Selling Pause.")

         (e) Issuer shall cooperate with Seller and its counsel in connection
with the registration or qualification of the Premium Shares for offering and
sale by Sellers under the securities or Blue Sky laws of such jurisdictions as
Seller may designate and shall file such consents to service of process or other
documents necessary or appropriate in order to effect such registration or
qualification; provided that in no event shall Issuer be obligated to qualify to
do business in any jurisdiction where it is not now so qualified or to take any
action which would subject it to service of process in suits, other than those
arising out of the offering or sale of the Premium Shares, in any jurisdiction
where it is not now so subject.

         (f) Issuer shall make generally available to its security holders a
consolidated earnings statement, which need not be audited, covering a
twelve-month period commencing after the effective date of the Registration
Statement and ending not later than 15 months thereafter, as soon as practicable
after the end of such period, which consolidated earnings statement shall
satisfy the provisions of Section ll (a) of the Act.

         (g) During the period of four years hereafter, Issuer shall furnish to
Seller, as soon as available, a copy of each report of Issuer mailed to
stockholders or filed with the Commission.


                                        3

<PAGE>   4
         (h) [Intentionally deleted.]

         (i) Except as stated in this Agreement and the Prospectus, Issuer shall
not take, directly or indirectly, any action designed to or that might
reasonably be expected to cause or result in stabilization or manipulation of
the price of the Issuer Common Stock to facilitate the sale or resale of the
Premium Shares.

         (j) Issuer shall use its best efforts to have the Premium Shares made
eligible for quotation on the Nasdaq National Market on or before the first 
Effective Date.

         (k) For so long as this Agreement shall be in effect, Issuer shall
timely file all reports that it is required to file pursuant to the Exchange
Act.

4. AGREEMENTS OF SELLER AND SELLING AGENT.

         Seller and Selling Agent agree with Issuer as follows:

         (a) Seller and Selling Agent each agrees that it will not effect any
disposition of the Premium Shares that would constitute a sale within the
meaning of the Act except in compliance with applicable securities laws, and
that it will promptly notify Issuer of any material changes in the information
set forth in the Registration Statement regarding Seller or Selling Agent or the
plan of distribution.

         (b) Seller and Selling Agent each acknowledges that there may
occasionally be Selling Pauses. Seller and Selling Agent each hereby covenants
that it will not sell any Premium Shares pursuant to the Prospectus during a
Selling Pause.

         (c) Seller and Selling Agent each agrees not to make any sale or other
transfer of the Premium Shares pursuant to the Registration Statement without
effectively causing the prospectus delivery requirements under the Act to be
satisfied.

         (d) Seller shall advise Issuer at such time as a prospectus is no
longer required by the Act to be delivered in connection with sales of Premium
Shares by Sellers.

5.  REPRESENTATIONS AND WARRANTIES OF ISSUER.

         Issuer represents and warrants to Sellers on and as of (i) the date
hereof, (ii) each Effective Date, (iii) each Premium Payment Date and (iv) in
respect of subsections (a), (b) and (c) below, the date of each offer and sale
of Premium Shares hereunder (other than any offers and sales that might be made
during a Selling Pause) that:

         (a) The Registration Statement has (i) been prepared by Issuer in
conformity with the requirements of the Act, (ii) been filed with the Commission
under the Act and (iii) become effective under the Act. Copies of such
Registration Statement have been delivered by Issuer to Seller. The Commission
has not issued any order preventing or suspending the use of any Prospectus.


                                        4

<PAGE>   5
         (b) The Registration Statement conforms, and the Prospectus and any
further amendments or supplements to the Registration Statement or the
Prospectus will, when they become effective or are filed with the Commission, as
the case may be, conform in all material respects to the requirements of the Act
and do not and will not, as of the applicable effective date (as to the
Registration Statement and any amendment thereto) and as of the applicable
filing date (as to the Prospectus and any amendment or supplement thereto)
contain an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading; provided that no representation or warranty is made as to
information contained in or omitted from the Registration Statement or the
Prospectus in reliance upon and in conformity with written information furnished
to Issuer by or on behalf of either of Sellers specifically for inclusion
therein.

         (c) The Incorporated Documents, when they became effective or were
filed with the Commission, as the case may be, conformed in all material
respects to the requirements of the Act or the Exchange Act, as applicable, and
none of such documents contained an untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary to
make the statements therein not misleading; and any further documents filed and
incorporated by reference in the Prospectus, when such documents become
effective or are filed with the Commission, as the case may be, will conform in
all material respects to the requirements of the Act or the Exchange Act, as
applicable, and will not contain an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary to make the
statements therein not misleading; provided that no representation or warranty
is made as to information contained in or omitted from any document incorporated
by reference in the Prospectus in reliance upon and in conformity with written
information furnished by or on behalf of either Seller to Issuer specifically
for inclusion therein; and provided further that, for purposes of this
subsection (c), any statement contained in any such document shall be deemed to
be modified or superseded to the extent that a statement in any Incorporated
Document prepared or filed with the Commission on a later date modifies or
replaces such statement, whether or not such later prepared and filed document
so states.

         (d) Issuer and each of its Subsidiaries (such term having the meaning
set forth in Rule 405 under the Act) have been duly incorporated or organized
and are validly existing as corporations or partnerships in good standing (or
the legal equivalent) under the laws of their respective jurisdictions of
incorporation or organization, are duly qualified to do business and are in good
standing as foreign corporations or partnerships in each jurisdiction in which
their respective ownership or lease of property or the conduct of their
respective businesses requires such qualification, except where the failure to
so qualify would not have a material adverse effect on the condition, financial
or otherwise, or in the earnings or business affairs of Issuer and its
Subsidiaries considered as one enterprise (a "Material Adverse Effect"); Issuer
and each of its Subsidiaries have full corporate power and authority necessary
to own or hold their respective properties and to conduct the businesses in
which they are engaged.

         (e) Issuer has an authorized capitalization as set forth in the
Prospectus, and all outstanding shares of Issuer Common Stock have been duly
authorized and validly issued, are fully paid and non-assessable and conform to
the description thereof contained in the Prospectus; and all of the issued
shares of capital stock or partnership interests of each Subsidiary of Issuer
have been duly authorized and validly issued, are fully paid and non-assessable
and (except for directors' qualifying shares or as disclosed in the Prospectus)
are owned directly or indirectly by Issuer, free and clear of all liens,
encumbrances, equities or claims, except as disclosed in the Prospectus.


                                        5

<PAGE>   6
         (f) The Premium Shares have been duly authorized and, when issued and
delivered against payment therefor as provided herein will be validly issued,
fully paid and non-assessable and will conform to the description thereof
contained in the Prospectus.

         (g) The execution, delivery and performance of this Agreement by Issuer
and the consummation of the transactions contemplated hereby will not conflict
with or result in a breach or violation of any of the terms or provisions of, or
constitute a default under, any material indenture, mortgage, deed of trust,
loan agreement or other material agreement or instrument to which Issuer or any
of its Subsidiaries is a party or by which Issuer or any of its Subsidiaries is
bound or to which any of the property or assets of Issuer or any of its
Subsidiaries is subject, nor will such actions result in any violation of the
provisions of the charter or by-laws or other organizational documents of Issuer
or any of its Subsidiaries or any statute or any order, rule or regulation of
any court or governmental agency or body having jurisdiction over Issuer or any
of its Subsidiaries or any of their properties or assets; and except for the
registration of the Premium Shares under the Act and such consents, approvals,
authorizations, registrations or qualifications as may be required under the
Exchange Act and applicable state securities laws in connection with the
purchase and distribution of the Premium Shares by Seller, no consent, approval,
authorization or order of, or filing or registration with, any such court or
governmental agency or body (except such as have been obtained) is required for
the execution, delivery and performance of this Agreement by Issuer and the
consummation by Issuer of the transactions contemplated hereby.

         (h) There are no contracts, agreements or understandings between Issuer
and any person granting such person the right to require Issuer to file a
registration statement under the Act with respect to any securities of Issuer
owned or to be owned by such person or to require Issuer to include such
securities in the securities registered pursuant to the Registration Statement.

         (i) Except as referred to in the Prospectus, Issuer has not sold or
issued any shares of Issuer Common Stock during the six-month period preceding
the date of the Prospectus, including any sales pursuant to Rule 144A under, or
Regulations D or S of, the Act, other than shares issued pursuant to employee
benefit plans, qualified stock option plans or other employee compensation plans
or pursuant to outstanding options, rights or warrants.

         (j) Neither Issuer nor any of its Subsidiaries has sustained, since the
date of the latest audited financial statements included or incorporated by
reference in the Prospectus, any loss or interference with its business from
fire, explosion, flood or other calamity, whether or not covered by insurance,
or from any labor dispute or court or governmental action, order or decree,
except for such losses or interferences that have not had, whether individually
or in the aggregate, a Material Adverse Effect; and, since such date, there has
not been any Material Adverse Effect in or affecting the general affairs,
management, financial position, stockholders' equity or results of operations of
Issuer and its Subsidiaries, otherwise than as set forth or contemplated in the
Prospectus; and, during the period from such date to the date of this Agreement,
there has not been any change in the capital stock or long-term debt of Issuer
or any of its Subsidiaries that is material to the Issuer and its Subsidiaries
taken as a whole.

         (k) The financial statements (including the related notes and
supporting schedules) filed as part of the Registration Statement or included or
incorporated by reference in the Prospectus present fairly, in all material
respects, the financial position of the entities purported to be shown thereby,
at the dates and for the periods indicated, in conformity with generally
accepted accounting principles.


                                        6

<PAGE>   7
         (l) Arthur Andersen, LLP, who have certified certain financial
statements of Issuer, whose report appears in the Prospectus or is incorporated
by reference therein and who have delivered the initial letter referred to in
Section 7(d) hereof, are independent public accountants as required by the Act.

         (m) Except as set forth in the Registration Statement, Issuer and each
of its Subsidiaries have good and marketable title to all real property owned by
them and reflected in the Issuer's consolidated financial statements, and good
and marketable title to all personal property owned by them, in each case free
and clear of all liens, encumbrances and defects, except for such liens,
encumbrances and defects that, individually or in the aggregate, would not have
a Material Adverse Effect and do not materially interfere with the use made
thereof by Issuer and its Subsidiaries; and all real property and buildings held
under lease by Issuer and its Subsidiaries are held by them under valid,
subsisting and enforceable leases, with such exceptions as are not material to
the Issuer and its Subsidiaries taken as a whole and do not interfere with the
use made thereof by Issuer and its Subsidiaries.

         (n) Issuer and its Subsidiaries maintain insurance in such amounts and
covering such risks as Issuer believes is commercially reasonable.

         (o) Except as described or referred to in the Prospectus, there are no
legal or governmental proceedings pending to which Issuer or any of its
Subsidiaries is a party or of which any property or assets of Issuer or any of
its Subsidiaries is the subject wherein an unfavorable decision, ruling or
finding is reasonably likely and would be reasonably expected to have a Material
Adverse Effect; and to the best of Issuer's knowledge, no such proceedings are
threatened or contemplated by governmental authorities or threatened by others.

         (p) There are no contracts or other documents which are required to be
described in the Prospectus or filed as exhibits to the Registration Statement
by the Act which have not been described in the Prospectus or filed as exhibits
to the Registration Statement or incorporated therein by reference as permitted
by the Act.

         (q) No relationship, direct or indirect, exists between or among Issuer
on the one hand, and the directors, officers, stockholders, customers or
suppliers of Issuer on the other hand, which is required to be described in the
Prospectus which is not so described in the Prospectus.

         (r) No labor disturbance by the employees of Issuer or any of its
Subsidiaries exists or, to the knowledge of Issuer, is imminent which is
reasonably expected to have a Material Adverse Effect and Issuer is not aware of
any existing or imminent labor disturbance by the employees of any of its
principal suppliers, manufacturers or contractors which is reasonably expected
to have a Material Adverse Effect.

         (s) Issuer has filed or caused to be filed all federal, state and local
income and franchise tax returns required to be filed through the date hereof
and has paid all taxes due thereon, except where the failure to do so would not
have a Material Adverse Effect, and no tax deficiency has been determined
adversely to Issuer or any of its Subsidiaries which has had (nor does Issuer
have any knowledge of any tax deficiency that has been or could reasonably be
asserted against Issuer or any of its Subsidiaries which is reasonably expected,
individually or in the aggregate, to have) a Material Adverse Effect.


                                        7

<PAGE>   8
         (t) Since the date as of which information is given in the Prospectus
through the date hereof, and except as may otherwise be disclosed in the
Prospectus, Issuer has not declared or paid any dividend on its capital stock.

         (u) Issuer maintains a system of internal accounting controls meeting
the requirements of Section 13(b)(2) of the Exchange Act in all material
respects.

         (v) Neither Issuer nor any of its Subsidiaries (i) is in violation of
its respective charter, by-laws or other organizational documents, (ii) is in
default in any material respect, and no event has occurred which, with notice or
lapse of time or both, would constitute such a default, in the due performance
or observance of any term, covenant or condition contained in any material
indenture, mortgage, deed of trust, loan agreement or other material agreement
or instrument to which it is a party or by which it is bound or to which any of
its properties or assets is subject, except for such defaults that would not,
whether individually or in the aggregate, be reasonably expected to have a
Material Adverse Effect, (iii) is in violation of any law, ordinance,
governmental rule, regulation or court decree to which it or its property or
assets may be subject, except for such violations that would not have a Material
Adverse Effect or (iv) has failed to obtain any material license, permit,
certificate, franchise or other governmental authorization or permit necessary
to the ownership of its property or to the conduct of its business as presently
conducted, except for such failures that would not, whether individually or in
the aggregate, have a Material Adverse Effect.

         (w) Neither Issuer nor any Subsidiary is an "investment company" within
the meaning of such term under the Investment Company Act of 1940 and the rules
and regulations of the Commission thereunder.

         (x) Issuer has not taken, directly or indirectly, any action which is
designed to or which has constituted or which might reasonably be expected to
cause or result in the stabilization or manipulation of the price of any
security of Issuer to facilitate the sale or resale of the Premium Shares,
except for any actions that do not constitute a violation of any law, rule,
regulation or ordinance.

         (y) This Agreement has been duly authorized, executed and delivered by
Issuer and constitutes a legal, valid and binding obligation of Issuer
enforceable against Issuer in accordance with the terms herein.

6.  INDEMNIFICATION AND CONTRIBUTION.

         (a) Issuer (subject to the last sentence of this Section 6(a)) agrees
to indemnify and hold harmless Seller and Selling Agent and each person, if any,
who directly or indirectly controls either of them within the meaning of Section
15 of the Act or Section 20(a) of the Exchange Act from and against any and all
losses, claims, damages, liabilities and expenses, including reasonable costs of
investigation (collectively, "Claims"), arising out of or based upon (i) any
untrue statement or alleged untrue statement of a material fact contained in the
Registration Statement or the Prospectus or in any amendment 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 Claims arise out of or are based upon (x)
any untrue statement or omission or alleged untrue statement or omission which
has been made therein or omitted therefrom in reliance upon and in conformity
with information furnished in writing to Issuer by Seller or Selling Agent or on
their behalf expressly for use in connection therewith, (y) any untrue statement
or omission or alleged untrue statement or omission in a Prospectus delivered to
an offeree or purchaser of Premium Shares during a Selling Pause, or (z) any
untrue statement or omission or alleged untrue statement


                                        8

<PAGE>   9
or omission in a Prospectus which was corrected in a subsequent Prospectus that
was delivered to the indemnified party in sufficient time and in requisite
quantity prior to the pertinent sales by the indemnified party. The foregoing
indemnity agreement shall be in addition to any liability which Issuer may
otherwise have.

         (b) If any action, suit or proceeding shall be brought against Seller
or Selling Agent or any person controlling either of them in respect of which
indemnity may be sought against Issuer, then Seller, Selling Agent or such
controlling person shall promptly notify Issuer, and Issuer shall assume the
defense thereof, including the employment of counsel and payment of all fees and
expenses. Seller, Selling Agent and any such controlling person shall have the
right to employ separate counsel in any such action, suit or proceeding and to
participate in the defense thereof, but the fees and expenses of such counsel
shall be at the expense of Seller, Selling Agent or such controlling person
unless (i) Issuer has agreed in writing to pay such fees and expenses, (ii)
Issuer has failed to assume the defense and employ counsel, or (iii) the named
parties to any such action, suit or proceeding (including any impleaded parties)
include Issuer and Seller, Selling Agent or such controlling person, and Seller,
Selling Agent or such controlling person shall have been advised by its counsel
that representation of such indemnified party and Issuer by the same counsel
would be inappropriate under applicable standards of professional conduct
(whether or not such representation by the same counsel has been proposed) due
to actual or potential differing interests between them, in which case Issuer
shall not have the right to assume the defense of such action, suit or
proceeding on behalf of Seller, Selling Agent or such controlling person. It is
understood, however, that Issuer shall, in connection with any one such action,
suit or proceeding or separate but substantially similar or related actions,
suits or proceedings in the same jurisdiction arising out of the same general
allegations or circumstances, be liable for the reasonable fees and expenses of
only one separate firm of attorneys (in addition to any local counsel) at any
time for Seller, Selling Agent and persons controlling either of them, which
firm shall be designated in writing by Seller or Selling Agent and shall be
reasonably acceptable to Issuer, and that all such fees and expenses shall be
reimbursed as they are incurred. Issuer shall not be liable for any settlement
of any such action, suit or proceeding effected without its written consent,
which consent shall not be unreasonably withheld, but if settled with such
written consent, or if there be a final judgment for the plaintiff in any such
action, suit or proceeding, Issuer agrees to indemnify and hold harmless Seller
and Selling Agent, to the extent provided in the preceding subsection (a), and
any such controlling person from and against any loss, claim, damage, liability
or expense by reason of such settlement or judgment.

         (c) Seller and Selling Agent agree to indemnify and hold harmless
Issuer, its directors, its officers who sign the Registration Statement and any
person who controls Issuer within the meaning of Section 15 of the Act or
Section 20(a) of the Exchange Act, to the same extent as the foregoing indemnity
from Issuer to Seller and Selling Agent, but only with respect to information
furnished in writing by or on behalf of Seller or Selling Agent expressly for
use in the Registration Statement, the Prospectus or any amendment or supplement
thereto. If any action, suit or proceeding shall be brought against Issuer, any
of its directors, any such officer or any such controlling person based on the
Registration Statement, the Prospectus or any amendment or supplement thereto,
and in respect of which indemnity may be sought against Seller or Selling Agent
pursuant to this subsection (c), Seller and Selling Agent shall have the rights
and duties given to Issuer by subsection (b) above (except that if Issuer shall
have assumed the defense thereof Seller and Selling Agent shall not be required
to do so, but may employ separate counsel therein and participate in the defense
thereof, but the fees and expenses of such counsel shall be at their expense),
and Issuer, its directors, any such officer and any such controlling person
shall have the rights and duties given to Seller and Selling Agent by subsection
(b) above. The foregoing indemnity agreement shall be in addition to any
liability which Seller and Selling Agent may otherwise have.


                                        9

<PAGE>   10
         (d) If the indemnification provided for in this Section 6 is
unavailable to an indemnified party under subsection (a) hereof, although
applicable in accordance with its terms, in respect of any losses, claims,
damages, liabilities or expenses referred to therein, then an 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, liabilities or expenses (i) in such proportion as is
appropriate to reflect the relative benefits received by Issuer on the one hand
and Seller and Selling Agent on the other hand from the offering of the Premium
Shares, or (ii) if the allocation provided by clause (i) above is not permitted
by applicable law, in such proportion as is appropriate to reflect not only the
relative benefits referred to in clause (i) above but also the relative fault of
Issuer on the one hand and Seller and Selling Agent on the other in connection
with the statements or omissions that resulted in such losses, claims, damages,
liabilities or expenses, as well as any other relevant equitable considerations.
The relative benefits received by Issuer on the one hand and Seller and Selling
Agent on the other shall be deemed to be in the proportion of 90% of the
benefits by the Issuer and 10% of the benefits by the Seller and Selling Agent.
The relative fault of Issuer on the one hand and Seller and Selling Agent on the
other hand 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 Issuer on
the one hand or by Seller or Selling Agent on the other hand and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission.

         (e) Issuer, Seller and Selling Agent agree that it would not be just
and equitable if contribution pursuant to this Section 6 were determined by a
pro rata allocation or by any other method of allocation that does not take
account of the equitable considerations referred to in subsection (d) above. The
amount paid or payable by an indemnified party as a result of the losses,
claims, damages, liabilities and expenses referred to in subsection (d) above
shall be deemed to include, subject to the limitations set forth above, any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating any claim or defending any such action, suit or
proceeding. Notwithstanding the provisions of this Section 6, Seller and Selling
Agent collectively shall not be required to contribute any amount in excess of
the amount by which the total price of the Premium Shares obtained from sales
pursuant to the Offering exceeds the amount of any damages which Seller and
Selling Agent will have otherwise been required to pay by reason of such untrue
or alleged untrue statement or omission or alleged omission. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation.

         (f) No indemnifying party shall, without the prior written consent of
the indemnified party, which shall not be unreasonably withheld, effect any
settlement of any pending or threatened action, suit or proceeding in respect of
which any indemnified party is or could have been a party and indemnity could
have been sought hereunder by such indemnified party, unless such settlement
includes an unconditional release of such indemnified party from all liability
on claims that are the subject matter of such action, suit or proceeding.

         (g) Any losses, claims, damages, liabilities or expenses for which an
indemnified party is entitled to indemnification or contribution under this
Section 6 shall be paid by the indemnifying party to the indemnified party as
such losses, claims, damages, liabilities or expenses are incurred. The
indemnity and contribution agreements contained in this Section 6 and the
representations and warranties of Issuer set forth in this Agreement shall
remain operative and in full force and effect, regardless of (i) any
investigation made by or on behalf of Seller, Selling Agent or any person
controlling either of them, Issuer, its directors or officers or any person
controlling Issuer, (ii) acceptance of any Premium Shares and payment therefor


                                       10

<PAGE>   11
hereunder, and (iii) any termination of this Agreement. A successor to Seller or
Selling Agent or any person controlling either of them, or to Issuer, its
directors or officers or any person controlling Issuer, shall be entitled to the
benefits of the indemnity, contribution and reimbursement agreements contained
in this Section 6.

7.  CONDITIONS OF CONSUMMATION.

         Seller's obligation to consummate any Call Option Transaction on its
Premium Payment Date is subject to the following conditions:

         (a) The Registration Statement shall have become effective, and all
filings, if any, required by Rule 424 under the Act shall have been timely made;
no stop order suspending the effectiveness of the Registration Statement shall
have been issued and no proceeding for that purpose shall have been instituted
or, to the knowledge of Issuer or Seller, threatened by the Commission, and any
request of the Commission for additional information (to be included in the
Registration Statement or the Prospectus or otherwise) shall have been complied
with to their satisfaction.

         (b) Sellers shall have received an opinion of Morgan, Lewis & Bockius
LLP, counsel for Issuer, dated the relevant Premium Payment Date and addressed
to Sellers in the form heretofore approved by Sellers.

         (c) Sellers shall have received an opinion of Barbara S. Schilberg,
General Counsel to Issuer, dated the relevant Premium Payment Date and addressed
to Sellers, in the form heretofore approved by Sellers.

         (d) Sellers shall have received letters addressed to Sellers and dated
the date hereof and the relevant Premium Payment Date from Arthur Andersen, LLP,
independent certified public accountants, substantially in the forms heretofore
approved by Sellers.

         (e) (i) there shall not have been any change in the capital stock of
Issuer nor any material increase in the short-term or long-term debt of Issuer
(other than in the ordinary course of business) from that set forth or
contemplated in the Registration Statement or the Prospectus (or any amendment
or supplement thereto); (ii) there shall not have been, since the respective
dates as of which information is given in the Registration Statement and the
Prospectus (or any amendment or supplement thereto), except as may otherwise be
stated in the Registration Statement and Prospectus (or any amendment or
supplement thereto), any material adverse change in the condition (financial or
other), business, prospects, properties, net worth or results of operations of
Issuer and the Subsidiaries taken as a whole; (iii) Issuer and the Subsidiaries
shall not have any liabilities or obligations, direct or contingent (whether or
not in the ordinary course of business), that are material to Issuer and the
Subsidiaries, taken as a whole, other than those reflected or referred to in the
Registration Statement or the Prospectus (or any amendment or supplement
thereto); and (iv) all the representations and warranties of Issuer contained in
this Agreement shall be true and correct in all material respects on and as of
the relevant Premium Payment Date as if made on and as of such Premium Payment
Date, and Seller shall have received a certificate on the relevant Premium
Payment Date dated such Premium Payment Date and signed on behalf of Issuer by
the chief executive officer and the chief financial officer of Issuer (or such
other officers as are acceptable to Seller), to the effect set forth in this
Section 7(e) and in Section 7(f) hereof.


                                       11

<PAGE>   12
         (f) Issuer shall not have failed to perform or comply with any of its
agreements herein contained and required to be performed or complied with by it
hereunder.

         (g) The Premium Shares shall have become eligible for quotation on the
Nasdaq National Market.

         All such opinions, certificates, letters and other documents will be in
compliance with the provisions hereof only if they are satisfactory in form and
substance to Seller and its counsel.

         Any certificate or document signed by any officer of Issuer and
delivered to Seller, Selling Agent or their counsel shall be deemed a
representation and warranty by Issuer to Seller as to the statements made
therein.

8.  EXPENSES.

         Issuer agrees to pay the following costs and expenses and all other
costs and expenses incident to the performance by it of its obligations
hereunder: (i) the preparation, printing or reproduction, and filing with the
Commission of the Registration Statement (including financial statements and
exhibits thereto), the Prospectus and each amendment or supplement to any of
them; (ii) the printing (or reproduction) and delivery (including postage, air
freight charges and charges for counting and packaging) of such copies of the
Registration Statement, the Prospectus, the Incorporated Documents, and all
amendments or supplements to any of them, as may be reasonably requested for use
in connection with the offering and sale of the Premium Shares; (iii) the
preparation, printing, authentication, issuance and delivery of certificates for
the Premium Shares, including any stamp taxes in connection with the original
issuance and sale of the Premium Shares; (iv) the printing (or reproduction) and
delivery of this Agreement, the preliminary and supplemental Blue Sky Memoranda
and all other agreements or documents printed (or reproduced) and delivered in
connection with the offering of the Premium Shares; (v) obtaining eligibility of
the Premium Shares for quotation on the Nasdaq National Market; (vi) the
registration or qualification of the Premium Shares for offer and sale under the
securities or Blue Sky laws of the several states as provided in Section 3(e)
hereof (including the reasonable fees, expenses and disbursements of Sellers'
counsel relating to the preparation, printing or reproduction, and delivery of
the preliminary and supplemental Blue Sky Memoranda and such registration and
qualification); (vii) the filing fees and the fees and expenses of Sellers'
counsel in connection with any filings required to be made with the National
Association of Securities Dealers, Inc.; and (viii) the fees and expenses of
Issuer's accountants and the fees and expenses of counsel (including local and
special counsel) for Issuer.

9.  EFFECTIVE DATE OF AGREEMENT.

         This Agreement shall become effective upon the execution and delivery
hereof by the parties hereto.

10. TERMINATION OF AGREEMENT.

         This Agreement shall be subject to termination in Seller's absolute
discretion, without liability on its part to Issuer, by notice to Issuer if
before the consummation of the first Call Option Transaction (i) trading in
securities generally on the New York Stock Exchange, the American Stock
Exchange, or the Nasdaq National Market shall have been suspended or materially
limited, (ii) a general moratorium on commercial banking activities in New York
or Pennsylvania shall have been declared by


                                       12

<PAGE>   13
either federal or state authorities, or (iii) there shall have occurred any
outbreak or escalation of hostilities or other international or domestic
calamity, crisis or change in political, financial or economic conditions, the
effect of which on the financial markets of the United States is such as to make
it, in Seller's reasonable judgment, impracticable to commence or continue the
Offering. Notice of such termination may be given to Issuer by telegram,
telecopy or telephone and shall be subsequently confirmed by letter.

11.  INFORMATION FURNISHED BY SELLER AND SELLING AGENT.

         The statements set forth in the second paragraph on the cover page of
the Prospectus and the statements under the caption "Plan of Distribution" in
the Prospectus constitute, as of the date hereof, the only information furnished
by Seller or Selling Agent or on their behalf as such information is referred to
in Sections 5(c) and 6 hereof.

12.  SEVERABILITY.

         If any provision of this Agreement is or becomes invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained herein shall not be affected thereby.

13.  MISCELLANEOUS.

         (a) Except as otherwise provided in Sections 3 and 10 hereof, notice
given pursuant to any provision of this Agreement shall be in writing and shall
be delivered (i) if to Issuer, at the office of Issuer at 145 Brandywine
Parkway, West Chester, PA 19380, Attention: Barbara S. Schilberg, Senior Vice
President and General Counsel; (ii) if to Seller, in care of Selling Agent at
its office at 222 Broadway, New York, NY 10038, Attention, Robert C. Errico,
Executive Director, Legal Affairs; and (iii) if to Selling Agent, at its office
at 222 Broadway, New York, NY 10038, Attention, Robert C. Errico, Executive
Director, Legal Affairs.

         (b) This Agreement has been and is solely for the benefit of Sellers,
Issuer, its directors and officers, and the other controlling persons referred
to in Section 6 hereof and their respective successors and assigns, to the
extent provided herein, and no other person shall acquire or have any right
under or by virtue of this Agreement. Neither the term "successor" nor the term
"successors and assigns" as used in this Agreement shall include a purchaser
from Seller of any of the Premium Shares in his status as such purchaser.

14.  APPLICABLE LAW; COUNTERPARTS; ENTIRE AGREEMENT.

         (a) This Agreement shall be governed by and construed in accordance
with the laws of the State of New York applicable to contracts made and to be
performed within the State of New York.

         (b) This Agreement may be signed in various counterparts which together
constitute one and the same instrument. If signed in counterparts, this
Agreement shall not become effective unless at least one counterpart hereof
shall have been executed and delivered on behalf of each party hereto.


                                       13

<PAGE>   14
         (c) This Agreement, the Master Agreement and each Confirmation
constitute the entire agreement among the parties and supersede any previous
agreements or understandings with respect to the subject matter hereof and
thereof.



[End of page]


                                       14

<PAGE>   15
         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

                                 CEPHALON, INC.  (Issuer)

                                 By:____________________________________

                                 Name:__________________________________

                                 Title:_________________________________


                                 SWISS BANK CORPORATION,
                                 LONDON BRANCH (Seller)


                                 By:____________________________________

                                 Name:__________________________________

                                 Title:_________________________________


                                 By:____________________________________

                                 Name:__________________________________

                                 Title:_________________________________


                                 SBC WARBURG INC.  (Selling Agent)


                                 By:____________________________________

                                 Name:__________________________________

                                 Title:_________________________________


                                 By:____________________________________

                                 Name:__________________________________

                                 Title:_________________________________



                                       15





<PAGE>   1
                                                                    Exhibit 23.2


                               ARTHUR ANDERSEN LLP



                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated March 3, 1997
included in Cephalon, Inc.'s Form 10-K/A-2 for the year ended December 31, 1996
and to all references to our Firm included in this registration statement.


                                                      ARTHUR ANDERSEN LLP


Philadelphia, PA
 May 1, 1997




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