GENSIA SICOR INC
S-3, 1997-09-16
PHARMACEUTICAL PREPARATIONS
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<PAGE>
 
  As filed with the Securities and Exchange Commission on September 16, 1997.
                                                      Registration No. 333-_____
                                                                                

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-3

                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                               GENSIA SICOR INC.
             (Exact name of registrant as specified in its charter)
<TABLE>
<S>                                       <C>
Delaware                                                            33-0176647
(State or other jurisdiction of           (I.R.S. Employer Identification No.)
 incorporation or organization)
</TABLE>

                            9360 Towne Centre Drive
                          San Diego, California 92121
                                 (619) 546-8300
         (Address, including zip code, and telephone number, including
             area code of registrant's principal executive offices)

<TABLE>
<CAPTION>
                                          Copies to:
<S>                                       <C>
             DAVID F. HALE                 THOMAS E. SPARKS, JR., ESQ.
 President and Chief Executive Officer    Pillsbury Madison & Sutro LLP
           Gensia Sicor Inc.                     P. O. Box 7880
        9360 Towne Centre Drive           San Francisco, CA 94120-7880
      San Diego, California 92121                (415) 983-1000
             (619) 546-8300
(Name, address, including zip code, and
 telephone number, including area code,
 of agent for service)
</TABLE>

Approximate date of commencement of proposed sale to the public: From time to
time after the effective date of this Registration Statement as determined by
the Selling Stockholders.

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, please 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: [ ]
                                _______________

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
================================================================ 
Title of each class of          Proposed            Amount of
 securities to be                maximum           registration
 registered                 aggregate offering         fee
                                 price     
- ----------------------     -------------------     -------------
<S>                           <C>                  <C>
Common Stock, $.01 par        $5,322,500           $1,613
value                        
 
===============================================================
</TABLE>
                                        
(1)  Estimated solely for the purpose of calculating the registration fee
     pursuant to Rule 457(o).

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>
 
                SUBJECT TO COMPLETION, DATED SEPTEMBER 16, 1997

                               GENSIA SICOR INC.

                         _______ SHARES OF COMMON STOCK

                                    ________

     This Prospectus covers the public offering, which is not being
underwritten, of _____________ shares (the "Shares") of Common Stock, par value
$.01 of Gensia Sicor Inc. ("Gensia Sicor" or the "Company") held by certain
persons named in this Prospectus (the "Selling Stockholders").  The Shares are
to be issued by the Company to Gensia Clinical Partners, L.P. (the
"Partnership") pursuant to the terms of Section 5.06 of the Development and
Marketing Agreement dated as of June 13, 1991 between Gensia Sicor and the
Partnership (the "Development and Marketing Agreement") following the granting
by the U.S. Food and Drug Administration of approval to market the GenESA
System, a proprietary pharmacologic stress testing system.  Under the provisions
of Section 5.06 of the Development and Marketing Agreement, the Company is to
register Shares worth $5,322,500 (the "Milestone Payment").  The exact number of
shares to be issued will be determined by dividing the Milestone Payment by 95%
of the average closing price per share of the Common Stock of Gensia Sicor on
the Nasdaq National Market on the 15 trading days prior to the fifth trading day
prior to the date of delivery of the Shares to the Partnership.  The Shares will
in turn be distributed by the Partnership to the Selling Stockholders, who, or
which, are limited partners of the Partnership, pursuant to the terms of the
Partnership's Agreement of Limited Partnership, dated as of June 13, 1991 (the
"Partnership Agreement").  The Company intends to use its best efforts to keep
the registration statement, of which this Prospectus is a part, effective until
such date as the Shares have been sold or may be sold under Rule 144(k) of the
Securities Act of 1933, as amended.

     The Company will not receive any proceeds from the resale of the Shares,
and is bearing the costs relating to this registration of the Shares.  See
"Selling Stockholders and Plan of Distribution."

                                 ______________

     THESE SECURITIES INVOLVE A HIGH DEGREE OF RISK. SEE "RISK FACTORS"
COMMENCING ON PAGE 5 OF THIS PROSPECTUS.
                                 ______________

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                                 ______________
                The date of this Prospectus is September __, 1997
<PAGE>
 
                             AVAILABLE INFORMATION

     The Company is subject to the informational 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 (i) inspected and
copied at the public reference facilities maintained by the Commission at 450
Fifth Street, N.W., Judiciary Plaza, Washington, D.C., and at the Commission's
Chicago Regional Office, 500 West Madison Street, Chicago, Illinois; and New
York Regional Office, 7 World Trade Center, New York, New York and (ii) accessed
via a Web site maintained by the Commission (http://www.sec.gov).  Copies of
such material can also be obtained from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549 at
prescribed rates.

     The Company has filed with the Commission a Registration Statement on Form
S-3 (Commission File No. 333-___) under the Securities Act, with respect to the
Common Stock offered hereby (the "Registration Statement"). This Prospectus does
not contain all of the information set forth in the Registration Statement and
the exhibits and schedules thereto. For further information with respect to the
Company and the Common Stock, reference is made to the Registration Statement
and the exhibits and schedules thereto. Statements contained in this Prospectus
as to the contents of any contract or other document are not necessarily
complete, and, in each instance, reference is made to the copy of such contract
or document filed as an exhibit to the Registration Statement, each such
statement being qualified in all respects by such reference. Copies of the
Registration Statement, including all exhibits thereto, may be obtained from the
Commission's principal office in Washington, D.C. upon payment of the fees
prescribed by the Commission, or may be examined without charge at the offices
of the Commission.


                      DOCUMENTS INCORPORATED BY REFERENCE

     The following documents previously filed with the Commission are hereby
incorporated by reference into this Prospectus:

     1.   The Company's Quarterly Report on Form 10-Q (File No. 0-18549) for the
quarter ended March 31, 1997 and a Quarterly Report on Form 10-Q, as amended 
by Form 10-Q/A, for the quarter ended June 30, 1997;

     2.   The Company's Annual Report on Form 10-K, as amended by Form 10-K/A,
for the year ended December 31, 1996;

     3.   The Company's Current Report on Form 8-K, as amended by Form 8-K/A,
dated February 28, 1997;

     4.   The description of Gensia Sicor Common Stock set forth in the
Registration Statement on Form 8-A filed on April 27, 1990; and

     5.   The description of the rights to purchase Series I Participating
Preferred Stock, $.01 par value, set forth in the Registration Statement on Form
8-A filed on March 23, 1992.

     All documents subsequently filed by Gensia Sicor pursuant to Section 13(a),
13(c), 14 or 15(d) of the Exchange Act prior to the termination of the offering
to which this Prospectus relates shall be deemed to be incorporated by reference
into this Prospectus and to be part of this Prospectus from the date of filing
thereof.

                                       2
<PAGE>
 
     Any statement contained in a document incorporated by reference herein
shall be deemed to be modified or superseded for purposes of this Prospectus and
the Registration Statement of which it is a part to the extent that a statement
contained herein or in any other subsequently filed document which also is
incorporated herein modifies or replaces such statement. Any statement so
modified or superseded shall not be deemed, in its unmodified form, to
constitute a part of this Prospectus or such Registration Statement.

     Upon written or oral request, the Company will provide without charge to
each person to whom a copy of this Prospectus is delivered a copy of the
documents incorporated by reference herein (other than exhibits to such
documents unless such exhibits are specifically incorporated by reference
therein). Requests should be submitted in writing or by telephone at (619) 546-
8300 to Gensia Sicor Inc., at the principal executive offices of the Company,
9360 Towne Centre Drive, San Diego, California 92121.


                                  THE COMPANY

     On February 28, 1997 Gensia Sicor Inc. (formerly Gensia, Inc.) completed
its acquisition of Rakepoll Holding B.V. ("Rakepoll Holding") from Rakepoll
Finance N.V. ("Rakepoll Finance").  Rakepoll Holding is the parent company of
three specialty pharmaceutical businesses:  SICOR-Societa Italiana
Corticosteroidi S.p.A. ("Sicor") of Milan, Italy, and two companies located in
Mexico: Lemery, S.A. de C.V. ("Lemery") and Sicor de Mexico, S.A. de C.V.
("Sicor de Mexico").  The newly combined company, Gensia Sicor Inc. ("Gensia
Sicor" or the "Company") is headquartered in San Diego, California. The Company
has announced its intention to move its headquarters to Irvine, California by
December 31, 1997.

     Sicor and Sicor de Mexico produce specialty bulk drug substances.  Lemery
manufactures oral and injectable finished multisource drug products.  The
specialty drug substances produced by Sicor and Sicor de Mexico are primarily
used in parenteral or topical administration, including inhalation therapy, and
almost all belong to one of three categories:  (1) anticancer agents, (2)
steroids or (3) non-depolarizing muscle relaxants used in anesthesia.  The
principal markets for Sicor's and Sicor de Mexico's specialty bulk drug
substances are the U.S., Canada, the European Union and Japan.  The finished
multisource drug products manufactured by Lemery are sold primarily to the
national health program in Mexico and are exported to certain countries in
Central and South America, North Africa, the Middle East and Eastern Europe.

     Gensia Laboratories, Ltd. ("GLL") is a wholly-owned subsidiary of the
Company.  Prior to the acquisition of Rakepoll Holding, the Company's primary
operating unit was GLL.  GLL's primary emphasis has been on the manufacture and
marketing of oncology, anesthesiology and other key multisource injectable
pharmaceuticals for the North American market.  GLL is currently engaged in
discussions with other pharmaceutical companies to seek to expand its product
offerings to foreign markets.  In addition, GLL provides contract manufacturing
support and services to a number of pharmaceutical and biotechnology companies.

     Gensia Sicor also conducts basic pharmaceutical research at its San Diego
location.  The Company's current operating plan includes funding its basic
research activities primarily through collaborations with other pharmaceutical
companies.  The Company is currently receiving contract research revenues
through its research collaborations with Pfizer Inc ("Pfizer") in the area of
pain management and with Sankyo Co. Ltd. ("Sankyo") for basic research funding
to discover and develop drugs for the treatment of non-insulin dependent (Type
II) diabetes.  Subject to certain consents and availability of funding, Gensia
Sicor plans to transfer certain of its San Diego based pharmaceutical research
and development programs into its Metabasis Therapeutics, Inc. subsidiary
("Metabasis") and spin off such subsidiary to its shareholders.  To the extent
the Company is unable to spin off Metabasis and is unable to fund its research
activities through its collaborations with Sankyo and Pfizer, the Company plans
to reduce its research expense to the level necessary to fulfill its obligations
under the Pfizer and Sankyo agreements.  There can be no assurance that the
Company's product development efforts 

                                       3
<PAGE>
 
with Pfizer and Sankyo will be successful or that Pfizer and or Sankyo will not
terminate their respective collaborations before any such milestones are
achieved or that Gensia Sicor will be able to obtain the consents and financing
necessary to spin off Metabasis to Gensia Sicor shareholders.

     As part of the Gensia Sicor restructuring, Gensia Sicor is planning to
transfer its licensed and proprietary medical products, including the Laryngeal
Mask Airway ("LMA") product line, the GenESA System, Brevibloc, and the Feedback
Controlled Heparin System ("FCHS") into Gensia Automedics, Inc.  This new
company's mission would be to become a profitable developer and marketer of
innovative medical products for the acute care market.  Gensia Automedics'
technology focus would be on developing products which use closed-loop drug
delivery.  Gensia Sicor is seeking to obtain external financing for this
company.  There can be no assurance that such financing will be available on
favorable terms, if at all.

                                       4
<PAGE>
 
                                  RISK FACTORS

     In addition to the other information contained in this Prospectus, the
following factors should be considered carefully before purchasing the shares of
Common Stock offered hereby.

FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING

     The Company anticipates that its current capital resources, commitments
from third parties, including funds received in May 1997 from issuance of
convertible notes and warrants in exchange for $20 million, and efforts to
reduce overall costs and expenses and working capital requirements will enable
it to maintain its current and planned operations through at least 1997.  The
Company will continue to pursue equity, debt and lease financing for its capital
needs.  In addition, the Company may seek equity funds to finance its
subsidiaries Gensia Automedics and Metabasis.  There can be no assurance that
any such financings will be available on acceptable terms, if at all.

LOSS HISTORY; UNCERTAINTY OF FUTURE PROFITABILITY

     Gensia Sicor was founded in 1986, has never made an annual profit, and has
never had positive annual cash flow from operations. As of June 30, 1997, Gensia
Sicor had an accumulated deficit of approximately $312.7 million. For the years
ended December 31, 1994, 1995 and 1996, Gensia Sicor had net losses applicable
to common shares of $56.1 million, $11.9 million, and $51.8 million,
respectively. Gensia Sicor may incur additional losses in the future and expects
that its losses will continue through at least 1997. Gensia Sicor may never
achieve profitable operations.

COMPETITION

     Gensia Sicor is engaged in a rapidly evolving field. Competition from large
pharmaceutical companies, biotechnology companies, medical device companies and
other companies is intense and expected to increase. Many of these companies
have substantially greater financial resources and experience in developing,
manufacturing and marketing pharmaceutical products than Gensia Sicor. There can
be no assurance that competitors will not succeed in developing technologies and
products that are more effective or that would render the technology and
products of Gensia Sicor and its subsidiaries obsolete or noncompetitive.
Gensia Sicor competes in the highly competitive multisource (generic) injectable
drug industry with numerous other pharmaceutical manufacturers, many of which
are established companies with greater financial and other resources than Gensia
Sicor.  There can be no assurance that Gensia Sicor will be able to continue to
compete effectively in this market. Because selling prices of multisource
injectable drug products typically decline as competition intensifies, the
profitability of Gensia Sicor will depend in part on its ability to develop and
introduce selected new products to the market in a timely manner, to obtain raw
materials at competitive prices and to improve the efficiency of its production
capability. The development and commercialization process is time consuming and
costly. Delays in any part of the process or the inability of Gensia Sicor to
obtain regulatory approval for its products could materially and adversely
affect the Company.

DEPENDENCE ON KEY PERSONNEL

     The success of Gensia Sicor depends in large part upon its ability to
attract and retain qualified scientific, manufacturing, marketing and management
personnel. Gensia Sicor faces competition for such personnel from other
companies, academic institutions, government entities and other organizations.
In addition, the success of Gensia Sicor will be dependent upon certain key
personnel associated with the Company, the loss of which may have a material
adverse effect on the Company's operations.

                                       5
<PAGE>
 
DEPENDENCE UPON SUCCESSFUL INTEGRATION OF GENSIA SICOR, SICOR, LEMERY AND SICOR
DE MEXICO

     Achieving the anticipated benefits of the acquisition of Sicor, Lemery and
Sicor de Mexico will depend in part upon whether the integration of the
companies' businesses is accomplished in an efficient and effective manner, and
there can be no assurance that this will occur. The combination of Gensia Sicor,
Sicor, Lemery and Sicor de Mexico requires, among other matters, integration of
each of the combining companies' respective development, administrative,
finance, sales, product support, distribution and marketing organizations, as
well as the integration of each such companies' product offerings and
development activities. Of particular significance to the successful integration
of the combining companies' businesses is reassuring Gensia Sicor's customers
that product support and distribution will continue uninterrupted. There can be
no assurance that such integration will be accomplished smoothly or
successfully. Further, there can be no assurance that the operations,
managements or personnel of the combining companies will be compatible or that
Gensia Sicor will not experience the loss of key personnel. The difficulties of
such integration may be increased by the necessity of coordinating organizations
located in different countries. The integration of certain operations requires
the dedication of management resources which may temporarily distract from the
day-to-day business of the combined company. Additionally, the costs incurred
and difficulties encountered in the transition process may, at least in the
short term, have an adverse impact on the combined company's operations. In
particular, the Company expects to take a special charge of $1.5 to $2.5 million
in the third quarter of 1997 to reserve for corporate and employee relocation
and severance costs as the Company moves its headquarters to Irvine, California.
The inability of management to integrate the operations of the companies
successfully could have a material adverse effect on the business and results of
operations of the combined company.

UNCERTAINTY OF ABILITY TO OPERATE WITHOUT INFRINGING ON PATENTS AND PROPRIETARY
TECHNOLOGY OF OTHERS

     The success of Gensia Sicor will depend, in part, on its ability to
maintain trade secret protection and operate without infringing on the
proprietary rights of third parties.  There can be no assurance that the patents
of others will not have an adverse effect on the ability of Gensia Sicor to
commercialize its products.  Litigation, which could result in substantial cost
to the Company, may be necessary to determine the scope and validity of the
proprietary rights of third parties.  If any of the Company's products are found
to infringe upon patents or other rights owned by third parties, Gensia Sicor
may be required to obtain licenses to patents or other proprietary rights of
third parties which may not be available on acceptable terms. If Gensia Sicor
does not obtain such licenses, product introductions could be delayed or
foreclosed. There can be no assurance that Gensia Sicor will have sufficient
funds to obtain licenses that may be required in order to develop and
commercialize its products, to contest patents obtained by third parties, or to
defend against suits brought by third parties.

POTENTIAL INABILITY TO OBTAIN RAW MATERIALS OR MANUFACTURE PRODUCTS

     Gensia Sicor depends on third party manufacturers for bulk raw materials
for certain of its products. These raw materials are generally available from a
limited number of sources, and certain raw materials are available only from
foreign sources. In addition, GLL utilizes sole sources of supply for certain
raw materials used in the manufacture of its products and certain packaging
components. Any disruption in one or more of these supply sources could have a
material adverse effect on Gensia Sicor.

UNCERTAINTY OF PHARMACEUTICAL PRICING, REIMBURSEMENT AND RELATED MATTERS

     The levels of revenues and profitability of pharmaceutical companies will
be affected by the continuing efforts of governmental and third party payors to
contain or reduce the costs of health care through various means. For example,
in certain foreign markets pricing or profitability of prescription
pharmaceuticals is subject to government control. In the United States, there
have been, and Gensia Sicor expects that there will 

                                       6
<PAGE>
 
continue to be, a number of federal and state proposals to implement government
controls. While Gensia Sicor cannot predict whether any such legislative or
regulatory proposals or reforms will be adopted or the effect such proposals or
reforms may have on its businesses, the announcement of such proposals or
reforms could have a material adverse effect on Gensia Sicor's ability to raise
capital and the adoption of such proposals or reforms could have a material
adverse effect on Gensia Sicor's businesses, financial condition and
profitability. In addition, in both the United States and elsewhere, sales of
prescription pharmaceuticals are dependent in part on the availability of
reimbursement to the consumer from third party payors, such as government and
private insurance plans. Third party payors are increasingly challenging the
prices charged for medical products and services. There can be no assurance that
any of the products of Gensia Sicor will be considered cost effective and that
reimbursement to the consumer will be available or will be sufficient to allow
Gensia Sicor to sell its products on a competitive basis.

PRODUCT LIABILITY EXPOSURE; INADEQUACY OR UNAVAILABILITY OF PRODUCT LIABILITY
INSURANCE

     Gensia Sicor, as a manufacturer of finished drug products, faces an
inherent exposure to product liability claims in the event that the use of any
of its technology or products is alleged to have resulted in adverse effects.
This exposure exists even with respect to those products that receive regulatory
approval for commercial sale, as well as those undergoing clinical trials. While
Gensia Sicor has taken and will continue to take what it believes are
appropriate precautions, there can be no assurance that it will avoid
significant product liability exposure. Adequate insurance coverage might not be
available at acceptable costs, if at all, and product liability claims could
adversely affect the business or financial condition of Gensia Sicor.

     In addition, as a manufacturer of bulk drug substances, Gensia Sicor
supplies other pharmaceutical companies with active ingredients which are
contained in finished products. The ability of Gensia Sicor to avoid significant
product liability exposures depends upon its ability to negotiate appropriate
commercial terms and conditions with its customers and its customers'
manufacturing, quality control and quality assurance practices. There is no
assurance that adequate insurance coverage will be available at acceptable
costs, if at all, to insure against such exposures or that Gensia Sicor will be
able to negotiate satisfactory terms and conditions with its customers.
Commencing in 1995, Sicor received claims from certain of its customers in
connection with the shipment of contaminated products.  Rakepoll Holding
recorded a reserve of approximately $2.6 million in its financial statements for
the year ended December 31, 1996 which represented management's estimate of
product rework costs, attorney's costs and other settlement costs.  Actual costs
to be incurred in relation to the ultimate settlement may vary from the amount
estimated.

UNCERTAINTY REGARDING MEXICAN ECONOMIC FACTORS, GOVERNMENT POLICIES AND
INFLATION

     The Mexican government has exercised and continues to exercise significant
influence over many aspects of the Mexican economy. Accordingly, Mexican
government actions could have a significant effect on Lemery and Sicor de
Mexico, and on market conditions and prices in Mexico. Further, on a cumulative
basis, the inflation rate has exceeded 100% in Mexico over the three-year period
ended December 1996. There can be no assurance that actions by the Mexican
government, future developments in the Mexican economy or Mexico's political,
social or economic situation will not adversely affect the operations of Lemery
and Sicor de Mexico.

RISKS RELATED TO INTERNATIONAL OPERATIONS

     During 1995 and 1996 a significant percentage of the revenues of each of
Sicor, Lemery and Sicor de Mexico were derived from sales of pharmaceuticals
outside of Western Europe, Japan and the United States. Operations outside of
Western Europe, Japan and the United States are subject in varying degrees to
risks involved in doing business abroad such as war, civil disturbances, adverse
governmental actions (which may disrupt or impede operations and markets,
restrict the movement of funds, impose limitations on foreign 

                                       7
<PAGE>
 
exchange transactions or result in the expropriation of assets) and economic and
governmental instability. There can be no assurance that Gensia Sicor will not
experience material adverse developments with respect to its operations outside
of Western Europe, Japan and the United States and that such developments, if
they were to occur, would not have a material adverse effect on the results of
operations and financial conditions of Gensia Sicor.

ENVIRONMENTAL MATTERS

     Gensia Sicor is subject to numerous environmental regulations in the
jurisdictions in which it operates, including regulations relating to the
handling, transport and disposal of hazardous materials and the protection of
the environment. In certain of these jurisdictions, protection of the
environment is becoming an area of increased governmental scrutiny and
surveillance. While Gensia Sicor has implemented practices to comply with
applicable regulations, the cost of doing so in the future may become
prohibitive and may have a significant adverse impact on the companies'
operations. There is no assurance that Gensia Sicor will, in fact, be able to
comply with all applicable laws and regulations or that such laws and
regulations will not have a material adverse impact on the companies'
operations.  In addition, Sicor maintains liability insurance for certain
environmental risks which its management believes to be appropriate and in
accordance with industry practice. There can be no assurance, however, that
Sicor will not incur liabilities beyond the limits or outside the coverage of
its insurance.

CURRENCY FLUCTUATIONS

     Gensia Sicor has significant operations in several countries, including the
United States, Italy, and Mexico. In addition, purchases and sales are made in a
large number of other countries. As a result, the business is subject to the
risk and uncertainties of foreign currency fluctuations. While Gensia Sicor has
policies and strategies to minimize this risk, there can be no assurance that
such policies and strategies will be effective in preventing significant
negative financial adjustments in the future.

CONTROL BY RAKEPOLL FINANCE

     Rakepoll Finance owns 29,500,000 shares of Gensia Sicor Common Stock and,
pursuant to a Shareholder's Agreement, dated as of November 12, 1996, as amended
by and between Gensia Sicor and Rakepoll Finance, has designated two of Gensia
Sicor's nine directors (and has the right to designate one additional director),
who in turn designated (jointly with two executive officer directors of Gensia
Sicor) five additional directors. In addition, the consent of the Rakepoll
Finance designated directors is required for Gensia Sicor to take certain
actions, such as a merger or sale of all or substantially all of the business or
assets of Gensia Sicor and certain issuances of securities. As a result of its
ownership of Gensia Sicor Common Stock, Rakepoll Finance may be able to control
substantially all matters requiring approval by the stockholders of Gensia
Sicor, including the election of directors and the approval of mergers or other
business combination transactions.

                                       8
<PAGE>
 
POSSIBLE VOLATILITY OF STOCK PRICE; DIVIDEND POLICY

     The market price of the shares of Gensia Sicor Common Stock, like that of
the common stock of many other life sciences companies, has been and is likely
to continue to be highly volatile, and the market for securities of such
companies has from time to time experienced significant price and volume
fluctuations that are unrelated to the operating performance of particular
companies. The market price of Gensia Sicor Common Stock could be subject to
significant fluctuations in response to variations in Gensia Sicor's anticipated
or actual operating results, sales of substantial amounts of Gensia Sicor Common
Stock, other issuances of substantial amounts of Gensia Sicor Common Stock
pursuant to pre-existing obligations, announcements concerning Gensia Sicor or
its competitors, including the results of testing, technological innovations or
new commercial products or services, developments in patent or other proprietary
rights of Gensia Sicor or its competitors, including litigation, conditions in
the life sciences or pharmaceuticals industries, governmental regulation, health
care legislation, public concern as to the safety of Gensia Sicor's products,
changes in estimates of Gensia Sicor's performance by securities analysts,
market conditions for life sciences stocks in general, and other events or
factors.

     Gensia Sicor has never paid cash dividends on Gensia Sicor Common Stock.
Gensia Sicor presently intends to retain earnings, if any, for the development
of its businesses and does not anticipate paying any cash dividends on Gensia
Sicor Common Stock in the foreseeable future. Unless full cumulative dividends
are paid on Gensia Sicor's outstanding $3.75 Convertible Exchangeable Preferred
Stock, $.01 par value ("Convertible Preferred Stock"), cash dividends may not be
paid or declared and set aside for payment on Gensia Sicor Common Stock. Through
September 1997, the Company has approximately $7.5 million in undeclared
cumulative preferred dividends on such Convertible Preferred Stock.  The Company
made quarterly cash dividend payments of approximately $1.5 million per quarter
on the Convertible Preferred Stock from June 1, 1993 through March 1, 1995.
Subsequent to March 1995, as a measure to reduce cash outflows, the Company's
Board of Directors suspended quarterly cash dividend payments on the Convertible
Preferred Stock, resuming such cash dividend payments in September 1996.  If
Gensia Sicor chooses not to declare dividends for six cumulative quarters, the
holders of Convertible Preferred Stock, voting separately as a class, will be
entitled to elect two additional directors until the dividend in arrears has
been paid.

SUBORDINATION OF COMMON STOCK TO NOTES AND PREFERRED STOCK

     The Company has outstanding subordinated convertible notes in an aggregate
principal amount of $20 million ("Notes").  The Company's Common Stock is
expressly subordinate to the Notes and to the Series A Preferred Stock into
which the Notes are convertible in the event of the liquidation, dissolution or
winding up of the Company.  The Company's Common Stock is also subordinate to
the approximately $75,000,000 (plus accrued and unpaid dividends) liquidation
preference of the Company's outstanding $3.75 Convertible Exchangeable Preferred
Stock. If the Company were to cease operations and liquidate its assets, there
can be no assurance that there would be any remaining value available for
distribution to the holders of Common Stock after providing for the above
liquidation preferences.

EFFECT OF CERTAIN ANTI-TAKEOVER PROVISIONS

     Gensia Sicor's Certificate of Incorporation and Bylaws include provisions
that could discourage potential takeover attempts and make attempts by its
stockholders to change management more difficult. The approval of 66-2/3% of
Gensia Sicor's voting stock is required to approve certain transactions and to
take certain stockholder actions, including the calling of a special meeting of
stockholders and the amendment of any of the anti-takeover provisions contained
in Gensia Sicor's Certificate of Incorporation. Further, pursuant to the terms
of its stockholder rights plan, Gensia Sicor has distributed a dividend of one
right for each outstanding share of Gensia Sicor Common Stock. These rights will
cause a substantial dilution to a person or 

                                       9
<PAGE>
 
group that attempts to acquire Gensia Sicor on terms not approved by the Gensia
Sicor Board of Directors and may have the effect of deterring hostile takeover
attempts.


                                 CAPITAL STOCK

     The authorized capital stock of Gensia Sicor consists of 125,000,000 shares
of Common Stock, $.01 par value, and 5,000,000 shares of preferred stock, $.01
par value, of which 160,000 shares have been designated Series I Preferred Stock
and 1,840,000 shares have been designated $3.75 Convertible Exchangeable
Preferred Stock.

COMMON STOCK

     As of July 18, 1997, there were 74,451,518 shares of Common Stock
outstanding held by approximately 737 stockholders of record. The holders of
Common Stock are entitled to one vote for each share held of record on all
matters submitted to a vote of the stockholders. Gensia Sicor's Restated
Certificate of Incorporation (the "Certificate") does not provide for cumulative
voting. Subject to preferences that may be applicable to any then outstanding
preferred stock including the $3.75 Convertible Exchangeable Preferred Stock,
holders of Common Stock are entitled to receive ratably such dividends as may be
declared by the Board of Directors out of funds legally available therefor. In
the event of a liquidation, dissolution or winding up of Gensia Sicor, holders
of Common Stock are entitled to share ratably in all assets remaining after
payment of liabilities and the liquidation preference of any then outstanding
preferred stock. Holders of Common Stock have no redemption, conversion or
preemptive rights. All outstanding shares of Common Stock are fully paid and
nonassessable.

                           INCOME TAX CONSIDERATIONS

     Each prospective purchaser should consult his or her own tax advisor with
respect to the income tax issues and consequences of holding and disposing of
the Common Stock.

                 SELLING STOCKHOLDERS AND PLAN OF DISTRIBUTION

     The following table sets forth certain information known to the Company
with respect to the beneficial ownership of the Company's Common Stock as of
July 31, 1997 by the Selling Stockholders who or which are affiliated with the
Company.  All of the Selling Stockholders acquired the Shares offered hereby
pursuant to the terms of the Development and Marketing Agreement and the
Partnership Agreement.  The Development and Marketing Agreement requires the
Company to register with the Commission the resale of the Shares.

     As of July 31, 1997 there were approximately 629 Selling Stockholders, as
set forth below.  The Number of Shares Being Offered Column in the table below
will be completed when the number of Shares is determined in the manner
described on the cover page hereto.  Out of that aggregate number of Shares,
each Selling Stockholder will receive a number of Shares based upon the Selling
Stockholder's proportionate ownership interest in the Partnership.  Share
ownership information is based solely upon either information furnished to the
Company or reports furnished to the Company by the respective individuals or
entities, as the case may be, pursuant to the rules of the Commission:

                                       10
<PAGE>
 
<TABLE>
<CAPTION>
 
                                            Total Shares
                                             of Common         Number of       % of Common
                                           Stock Held at     Shares Being      Stock To Be
Selling Stockholder                        July 31, 1997        Offered      Held After Sale
- ----------------------------------------  ----------------  ---------------  ---------------
<S>                                       <C>               <C>              <C>
 
PaineWebber R&D Partners III, L.P.......             --           89 Units                --
PaineWebber Development Corp............             --            2 Units                --
Domain Associates(1)....................        126,568             1 Unit 
David F. Hale(2)........................      1,061,767(3)          1 Unit 
Daniel D. Burgess(4)....................        127,297(5)        1/2 Unit                --
Thomas M. Speace(2).....................         67,494           1/2 Unit                --
L. John Wilkerson(2)....................         79,673(7)        1/2 Unit                --
All Non-Affiliate Selling Stockholders
  as a Group (622 persons)..............                     432 1/2 Units                --
- ---------------
</TABLE>

(1)      Includes 14,750 shares which James C. Blair, a director of the Company,
         has the right to acquire within 60 days of July 31, 1997 pursuant to
         the exercise of options and warrants.  Includes 1,125 shares
         beneficially owned by Domain Partners, L.P.  Dr. Blair is a General
         Partner of One Palmer Square Associates, L.P., the general partner of
         Domain Partners, L.P.  Includes 50,000 shares which Domain Partners
         III, L.P. has the right to acquire within 60 days of July 31, 1997.
         Dr. Blair is a General Partner of One Palmer Square Associates III,
         L.P., the general partner of Domain Partners III, L.P.  Dr. Blair has
         an indirect beneficial interest in these shares.  Includes 1,509 shares
         beneficially owned by Domain Associates Profit Sharing Plan.  Includes
         4,125 shares which Domain Associates has the right to acquire within 60
         days of July 31, 1997 pursuant to the exercise of warrants.  Dr. Blair
         is a General Partner of Domain Associates.

(2)      The Selling Stockholders include employees, executive officers and
         directors of Gensia Sicor as follows:  David F. Hale, President, Chief
         Executive Officer and Director; Thomas M. Speace, Vice President,
         Marketing and Business Development, Gensia Laboratories, Ltd.; and L.
         John Wilkerson, Director.

(3)      Includes 448,000 shares held by a trust as to which Mr. Hale has shared
         voting and investment power, 54,000 shares held by Mr. Hale as
         custodian for his minor children as to which Mr. Hale has sole voting
         and investment power, and 423,036 shares which Mr. Hale has the right
         to acquire within 60 days of July 31, 1997 pursuant to the exercise of
         options and warrants.

(4)      Daniel D. Burgess is President, Chief Financial Officer and Treasurer
         of Gensia Automedics.

(5)      Includes 82,908 shares which Mr. Burgess has the right to acquire
         within 60 days of July 31, 1997 pursuant to the exercise of options.

(6)      Includes 63,281 shares which Mr. Speace has the right to acquire within
         60 days of July 31, 1997 pursuant to the exercise of options.

(7)      Includes 2,062 shares which Mr. Wilkerson has the right to acquire
         within 60 days of July 31, 1997 pursuant to the exercise of warrants.
         Also includes 16,111 shares which Dr. Wilkerson has the right to
         acquire within 60 days of July 31, 1997 pursuant to the exercise of
         options.  Includes 41,250 shares owned by Longbow Partners and 20,250
         shares which Longbow Partners has the right to acquire within 60 days
         of July 31, 1997 pursuant to the exercise of options.  Longbow Partners
         is a partnership of which the partners are certain shareholders of the
         Wilkerson Group.  Dr. Wilkerson disclaims beneficial ownership of the
         shares and options held by Longbow Partners.  Dr. Wilkerson is a
         consultant to the Wilkerson Group.

   Pursuant to the Registration Statement of which this Prospectus is a part,
the Shares may be sold by the Selling Stockholders from time to time while this
Registration Statement is effective in the over-the-counter market or 

                                       11
<PAGE>
 
otherwise at prices and terms prevailing at the time of sale or in negotiated
transactions. Although no Selling Stockholder has advised the Company that it
currently intends to sell the Shares, pursuant to this Registration Statement,
any Selling Stockholder may choose to sell all or a portion of the Shares from
time to time in the manner described above. The methods by which the Shares may
be sold by the Selling Stockholders in one or more of the following transactions
may include: (a) block trades in which the broker or dealer so engaged will
attempt to sell the securities as agent but may position and resell a portion of
the block as principal to facilitate the transaction, (b) purchases by a broker
or dealer as principal and resale by such broker or dealer for its account
pursuant to this Prospectus, and (c) ordinary brokerage transactions in which
the broker solicits purchasers. In effecting sales, brokers and dealers engaged
by a Selling Stockholder may arrange for other brokers or dealers to
participate. Brokers or dealers may receive commissions or discounts from a
Selling Stockholder in amounts to be negotiated (and, if such broker or dealer
acts as agent for the purchaser of such shares, from such purchaser). Brokers or
dealers may agree with a Selling Stockholder to sell a specified number of
shares at a stipulated price per share, and, to the extent such a broker or
dealer is unable to do so acting as agent for a Selling Stockholder, to purchase
as principal any unsold shares at the price required to fulfill such broker or
dealer commitment to such Selling Stockholder. Brokers or dealers who acquire
shares as principals may thereafter resell such shares from time to time in
transactions (which may involve crosses and book transactions and which may
involve sales to and through other brokers or dealers, including transactions,
of the nature described above) in the over-the-counter market, in negotiated
transactions or otherwise, at market prices prevailing at the time of sale or at
negotiated prices, and in connection as described above.

   The Company has agreed to indemnify the Selling Stockholders against certain
liabilities in connection with this registration, including liabilities under
the Securities Act.


                                 LEGAL MATTERS

   Certain legal matters with respect to the validity of the Shares offered
hereby are being passed upon for the Company by Pillsbury Madison & Sutro LLP,
San Francisco California. A member of the law firm of Pillsbury Madison & Sutro
LLP owns 30,000 shares of Common Stock.


                                    EXPERTS

   The consolidated financial statements of Gensia Sicor Inc. appearing in
Gensia Sicor Inc.'s Annual Report (Form 10-K/A) for the year ended December 31,
1996, have been audited by Ernst & Young LLP, independent auditors, as set forth
in their report thereon included therein and incorporated herein by reference.
Additionally, the consolidated financial statements of Rakepoll Holding
appearing in Gensia Sicor's Current Report on Form 8-K, as amended by Form 8-
K/A, dated February 28, 1997 have been audited by KPMG Accountants N.V., as set
forth in their report included therein and incorporated herein by reference.
Such financial statements are incorporated herein by reference in reliance upon
such reports given upon the authority of such firms as experts in accounting and
auditing.

                                       12
<PAGE>
 
   No dealer, salesperson or any other person has been authorized to give any
information or to make any representation not contained in this Prospectus in
connection with the offer made by this Prospectus and, if given or made, such
information or representation must not be relied upon as having been authorized
by the Company or the Selling Stockholders. This Prospectus does not constitute
an offer to sell or a solicitation of an offer to buy any securities other than
the registered securities to which it relates, or an offer in any jurisdiction
to any person to whom it is unlawful to make such an offer in such jurisdiction.
Neither the delivery of this Prospectus nor any sale made hereunder shall, under
any circumstances, create any implication that the information contained herein
is correct at any time subsequent to the date hereof.
 


                                                                                


                                _________ Shares
                                  Common Stock



                               GENSIA SICOR INC.
                                        
                                   PROSPECTUS
                                        

 


                                __________, 1997
<PAGE>
 
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth the various expenses in connection with the
sale and distribution of the securities being registered hereby, other than
underwriting discounts and commissions. All amounts are estimated except the
Securities and Exchange Commission registration fee and the Nasdaq National
Market listing fee.
<TABLE>
<CAPTION>
 
                                            Amount
                                            -------
<S>                                         <C>
 
     SEC registration fee.................  $ 1,613
     Blue Sky fees and expenses...........    1,000
     Accounting fees and expenses.........   10,000
     Legal fees and expenses..............   20,000
     Registrar and transfer agent's fees..    5,000
     NNM listing fee......................  $17,500
     Miscellaneous fees and expenses......    4,887
          Total..........................   $60,000
                                            =======
</TABLE> 
 

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Section 145 of the Delaware General Corporation Law (the "Delaware GCL")
permits the Company's board of directors to indemnify any person against
expenses (including attorneys' fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred by him in connection with any
threatened pending or completed action, suit or proceeding in which such person
is made a party by reason of his being or having been a director, officer,
employee or agent of the Company, in terms sufficiently broad to permit such
indemnification under certain circumstances for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act of 1933,
as amended (the "Act"). The Delaware GCL provides that indemnification pursuant
to its provisions is not exclusive of other rights of indemnification to which a
person may be entitled under any by-law, agreement, vote of stockholders or
disinterested directors, or otherwise.

     Article IX of the Company's Restated Certificate of Incorporation provides
for indemnification of the Company's directors, officers, employees and other
agents to the maximum extent permitted by law.

     As permitted by Sections 102 and 145 of the Delaware GCL, the Company's
Restated Certificate of Incorporation eliminates a director's personal liability
for monetary damages to the Company and its stockholders arising from a breach
or alleged breach of such director's fiduciary duty, except for liability under
Section 174 of the Delaware GCL or liability for any breach of the director's
duty of loyalty to the Company or its stockholders, for acts or omissions not in
good faith or which involve intentional misconduct or a knowing violation of law
or for any transaction from which the director derived an improper personal
benefit.

     In addition, the Company has entered into separate indemnification
agreements with its directors and officers that will require the Company, among
other things, to indemnify them against certain liabilities that may arise by
reason of their status or service as directors or officers to the fullest extent
not prohibited by law.

                                      II-1
<PAGE>
 
Item 16.  Undertakings

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933, as amended (the "Act"), may be permitted to directors, officers and
controlling persons of the Company pursuant to the foregoing provisions, or
otherwise, the Company has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
Company of expenses incurred or paid by a director, officer or controlling
person of the Company 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 Company will, unless in the
opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

           The undersigned Company 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 Act;
           (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 this Registration Statement; and (iii) to include any
           material information with respect to the plan of distribution not
           previously disclosed in this Registration Statement or any material
           change to such information in this Registration Statement; provided,
           however, that paragraphs (i) and (ii) do not apply if 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, as amended (the "Exchange Act") that are incorporated by
           reference in this Registration Statement.

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

               (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.

               (4)  For purposes of determining any liability under the Act,
           each filing of the Registrant's annual report pursuant to Section
           13(a) or Section 15(d) of the Exchange Act which is incorporated by
           reference in this 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-2
<PAGE>
 
                                   SIGNATURES
                                   ----------


     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3, and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of San Diego, State of California, September 15, 1997.

                                    GENSIA SICOR INC.



                             By               /s/ David F. Hale
                                -------------------------------------------
                                              David F. Hale
                                              President and
                                              Chief Executive Officer


                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that the person whose signature appears
below constitutes and appoints David F. Hale and John W. Sayward and each of
them, his true and lawful attorneys-in-fact and agents, each with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign any and all amendments, including post-effective
amendments, to this Registration Statement, and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing
requisite and necessary to be done, as fully to all intents and purposes as he
might or could do in person, hereby ratifying and confirming all that each of
said attorneys-in-fact and agents or their substitute or substitutes may
lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated:

Signature                Title                               Date
- ---------                -----                               ----
  
/s/ David F. Hale        President, Chief Executive Officer  September 15, 1997 
- ----------------------   and Director (Principal Executive
David F. Hale            Officer)
                      


/s/ John W. Sayward      Vice President, Finance, Chief      September 15, 1997 
- -----------------------  Financial Officer, and Treasurer
John W. Sayward          (Principal Financial and Principal
                         Accounting Officer)

                                      II-3
<PAGE>
 
Name                              Title                      Date
- -----                             ------                     -----

 
/s/ Donald E. Panoz               Chairman of the Board     September 15, 1997
- ---------------------------
Donald E. Panoz



/s/ James C. Blair, Ph.D.         Director                  September 15, 1997
- ---------------------------  
James C. Blair, Ph.D.
                                  


/s/ Michael D. Cannon             Director                  September 15, 1997
- ---------------------------
Michael D. Cannon



/s/ Herbert J. Conrad             Director                  September 15, 1997
- ---------------------------
Herbert J. Conrad



/s/ Carlos A. Ferrer              Director                  September 15, 1997
- ---------------------------
Carlos A. Ferrer



/s/ Carlo Salvi                   Director                  September 15, 1997
- ---------------------------
Carlo Salvi

                                  

/s/ Patrick D. Walsh              Director                  September 15, 1997
- ---------------------------
Patrick D. Walsh



/s/  L. John Wilkerson, Ph.D.     Director                  September 15, 1997
- -----------------------------
L. John Wilkerson, Ph.D.

                                      II-4
<PAGE>
 
                                 EXHIBIT INDEX
                                 -------------


     EXHIBIT
     NUMBER        DESCRIPTION OF DOCUMENT
     ------        -----------------------

     4.1/(1)/      Development and Marketing Agreement, dated as of June 13,
                   1991, between Gensia Sicor and Gensia Clinical Partners
                   L.P. (10.2)

     4.2/(1)/      Gensia Clinical Partners, L.P.  Agreement of Limited
                   Partnership, dated as of June 13, 1991. (10.7)

     4.3/(2)/      Form of Certificate for Gensia Sicor Common Stock with
                   Rights Legend.(4.1)

     5.1/(3)/      Opinion of Pillsbury Madison & Sutro LLP regarding the
                   legality of the securities being registered.

     23.1          Consent of Ernst & Young LLP, independent auditors.

     23.2          Consent of KPMG Accountants N.V., independent auditors.

     23.3/(3)/     Consent of Pillsbury Madison & Sutro LLP (included in its
                   opinion filed as Exhibit 5.1 to this Registration
                   Statement).

     24.1          Power of Attorney (see page II-4).
____________________

(1)  Incorporated by reference to the Company's Quarterly Report on Form
     10-Q for the quarter ended June 30, 1991 (No. 0-18549).

(2)  Incorporated by reference to the Company's Registration Statement on Form
     S-4 (No. 33-94778).

(3)  To be filed by amendment.

*    Parenthetical references after description of exhibits relate to the
     exhibit number under which exhibits were initially filed.

<PAGE>
 
                                                                    EXHIBIT 23.1
                                                                    ------------

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Experts" in the
Registration Statement on Form S-3 and related Prospectus of Gensia Sicor Inc.
for the registration of shares of its common stock and to the incorporation by
reference therein of our report dated February 21, 1997, except for Note 11 as
to which the date is March 27, 1997, with respect to the consolidated financial
statements of Gensia Sicor Inc. included in its Annual Report (Form 10-K/A) for
the year ended December 31, 1996, filed with the Securities and Exchange
Commission.

                                         /s/ Ernst & Young LLP


San Diego, California
September 16, 1997

<PAGE>
 
                                                                    EXHIBIT 23.2
                                                                    ------------

                        CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Gensia Sicor Inc.

We consent to the incorporation by reference of our report dated April 28, 1997,
with respect to the consolidated balance sheet of Rakepoll Holding B.V. and
subsidiaries as of December 31, 1996 and 1995, and the related consolidated
statements of operations, stockholders' equity and cash flows for each of the
years in the three years period ended December 31, 1996, which report is
incorporated by reference in the Form S-3 of Gensia Sicor Inc. and to the
reference to our firm under the heading "Experts" in the prospectus.


Rotterdam,  September 10, 1997



/s/ KPMG Accountants N.V.



Ref:  A. Vermaas


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