SCICLONE PHARMACEUTICALS INC
S-2/A, 1998-12-04
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 4, 1998
    
                                               REGISTRATION NO. 333-60425
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

   
                                AMENDMENT NO. 3
    
                                      to
                                    FORM S-2
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933


                         SCICLONE PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)


          CALIFORNIA                                            94-3116852
(State or other jurisdiction of                                (IRS Employer
incorporation or organization)                               Identification No.)

                    901 MARINERS ISLAND BOULEVARD, SUITE 205
                           SAN MATEO, CALIFORNIA 94404
                                 (650) 358-3456
                   (Address, including zip code, and telephone
                         number, including area code, of
                    registrant's principal executive offices)


                                DONALD R. SELLERS
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                         SCICLONE PHARMACEUTICALS, INC.
                    901 MARINERS ISLAND BOULEVARD, SUITE 205
                           SAN MATEO, CALIFORNIA 94404
                                 (650) 358-3456
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:
                             J. HOWARD CLOWES, ESQ.
                        Gray Cary Ware & Freidenrich LLP
                         139 Townsend Street, Suite 400
                         San Francisco, California 94107
                                 (415) 836-2500

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

         APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From
time to time as described in the Prospectus after the effective date of this
Registration Statement.

         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, check the following box. [X]

         If the registrant elects to deliver its latest annual report to
security holders, or a complete and legal facsimile thereof, pursuant to Item
11(a)(1) of this Form, 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, 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(b) 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 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 SUCH SECTION 8(a),
MAY DETERMINE.

<PAGE>   2
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

SUBJECT TO COMPLETION DATED ___________, 1998

                                3,000,000 SHARES

                         SCICLONE PHARMACEUTICALS, INC.

                                  COMMON STOCK

         This Prospectus relates to a maximum of 3,000,000 shares (the "Shares")
of common stock, no par value (the "Common Stock"), of SciClone Pharmaceuticals,
Inc., a California corporation ("SciClone" or the "Company"), consisting of (i)
up to 2,500,000 shares issuable from time to time, under certain circumstances,
to Cheyenne LLC, a New York limited liability company (the "Selling
Shareholder"), pursuant to the terms of the Structured Equity Line Flexible
Financing(SM) Agreement (the "Equity Line"), dated as of June 30, 1998, between
the Company and the Selling Shareholder and (ii) up to 500,000 shares of Common
Stock issuable upon exercise of certain warrants issued or issuable to the
Selling Shareholder pursuant to the Equity Line. See "The Company - Equity
Line."

         The shares of Common Stock being registered hereby constitute 2,500,000
of the shares issuable by the Company pursuant to the Equity Line. As more fully
set forth herein, the Company may issue a significantly fewer number of Shares
and, in any event, may not issue more than $4.0 million of Common Stock in any
of the eight three-month investment periods under the Equity Line, the first of
which begins upon the effective date of this registration statement of which
this Prospectus is a part. Further, the Company may register additional shares
on a separate registration statement at a future date if it determines that it
might sell additional shares under the Equity Line. See "The Company Equity
Line."

         The Shares may be offered from time to time by the Selling Shareholder
after the date of this Prospectus. The Company will receive the proceeds
from the sale and issuance of the Shares, if any, to the Selling Shareholder
pursuant to the Equity Line and upon exercise of the warrants but will not
receive any proceeds from the sale of the Shares by the Selling Shareholder.
There can be no assurance, however, that any Shares will be issued under the
Equity Line or that any warrants will be exercised. See "Use of Proceeds." The
Company will pay all expenses in connection with the registration and sale of
the Shares, except that the Selling Shareholder will pay any commissions,
discounts or other fees payable to brokers and dealers in connection with any
such sale.

         The Selling Shareholder has not advised the Company of any specific
plans for the distribution of the Shares other than as described herein, but it
is anticipated that the Shares will be sold from time to time primarily in
transactions (which may include block transactions) on The Nasdaq Stock Market
at the market price prevailing at the time of sale, although sales may also be
made in negotiated transactions with institutional investors or otherwise. There
can be no assurances that any of the Shares will be sold. See "Plan of
Distribution."

   
         The Selling Shareholder is an "underwriter" as defined in the 
Securities Act of 1933 (the "Securities Act") in connection with the sale of the
Shares offered hereby. Any broker-dealers or agents that participate with the
Selling Shareholder in sales of the Shares may be deemed to be "underwriters"
within the meaning of the Securities Act in connection with such sales. In such
event, any commissions received by such broker-dealers or agents and any profit
on the resale of the Shares purchased by them may be deemed to be underwriting
commissions or discounts under the Securities Act.
    

   
         The Common Stock currently is traded on The Nasdaq National Market
under the symbol "SCLN." On December 2, 1998, the last sale price of the Common
Stock, as reported by The Nasdaq National Market, was $1.25 per share.
    


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<PAGE>   3

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


                     SEE "RISK FACTORS" BEGINNING ON PAGE 4
                         FOR INFORMATION THAT SHOULD BE
                      CONSIDERED BY PROSPECTIVE PURCHASERS
                          OF THE SHARES OFFERED HEREBY.

                 NEITHER THE SECURITIES AND EXCHANGE COMMISSION
         NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED
           OF THESE SECURITIES OR PASSED UPON THE ACCURACY OR ADEQUACY
             OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
                             IS A CRIMINAL OFFENSE.
                       ----------------------------------


                 The date of this Prospectus is ____________, 1998.



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<PAGE>   4

                              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 (if required) and other
information with the Commission. The reports, proxy statements and other
information filed by the Company with the Commission may be inspected and copied
at the public reference facilities maintained by the Commission at Judiciary
Plaza, Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
Regional Offices of the Commission located at Northwestern Atrium Center, 500
West Madison Street, Suite 1400, Chicago, Illinois 60611 and 7 World Trade
Center, Suite 1300, New York, New York 10048. Copies of such material can also
be obtained by mail from the Public Reference Section of the Commission at 450
Fifth Street, N.W., Washington, D.C. 20549. The Company's Common Stock is traded
on The Nasdaq National Market. Reports and other information concerning the
Company can also be inspected at the offices of the National Association of
Securities Dealers, Inc., Market Listing Section, 1735 K Street, N.W.,
Washington, D.C. 20006. Such reports and other information may also be inspected
without charge at a Web site maintained by the Commission. The address of the
site is http://www.sec.gov.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following documents filed with the Commission by the Company
pursuant to the Exchange Act are incorporated herein by reference:

         1.       Amended Quarterly Report on Form 10-Q/A for the period ended
                  September 30, 1998, filed with the Commission on November 18,
                  1998;

         2.       Quarterly Report on Form 10-Q/A for the period ended September
                  30, 1998, filed with the Commission on November 16, 1998;

         3.       Quarterly Report on Form 10-Q for the period ended June 30,
                  1998, filed with the Commission on August 14, 1998;

         4.       Report on Form 8-K filed with the Commission on July 23, 1998;

         5.       Quarterly Report on Form 10-Q for the period ended March 31,
                  1998, filed with the Commission on May 14, 1998;

         6.       The definitive Proxy Statement for the Company's 1998 Annual
                  Meeting of Shareholders filed with the Commission on April 30,
                  1998;

         7.       Annual Report on Form 10-K for the year ended December 31,
                  1997, filed with the Commission on April 2, 1998;

         8.       The description of the Company's Common Stock contained in the
                  Company's Registration Statement on Form 8-A filed under the
                  Exchange Act, including any amendment or report filed for the
                  purpose of updating such description.

         Any statement contained in a document incorporated by reference or
deemed to be incorporated by reference herein shall be deemed to be modified or
superseded for purposes of this Registration Statement to the extent that a
statement contained herein or in any other subsequently filed document which
also is or is deemed to be 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
Registration Statement. The Company will provide without charge to each person
to whom this Registration Statement is delivered, upon written or oral request,
a copy of any or all of the foregoing documents incorporated by reference in
this Registration Statement (other than any exhibits thereto). Requests for such
documents should be directed to SciClone Pharmaceuticals, Inc. at 901 Mariners
Island Boulevard, Suite 205, San Mateo, California 94404 (telephone number (650)
358-3456), Attn.: Investor Relations.

         This Prospectus contains forward-looking statements within the meaning
of Section 27A of the Securities Act and Section 21E of the Securities Exchange
Act and the Company has attempted to identify such statements with an asterisk
("*"). Actual results could differ materially from those projected in these
forward-looking statements as a result of a variety of factors, including those
set forth below and elsewhere in this Prospectus.



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<PAGE>   5

                                  RISK FACTORS

         An investment in the Common Stock offered hereby involves a high degree
of risk and the Common Stock should not be purchased by persons who cannot
afford the loss of their entire investment. Purchasers should carefully consider
the following risk factors in conjunction with the other information included
and incorporated by reference in this Prospectus before purchasing or otherwise
acquiring the Common Stock offered hereby.

         This Prospectus contains forward-looking statements within the meaning
of Section 27A of the Securities Act and Section 21E of the Securities Exchange
Act and the Company has attempted to identify such statements with an asterisk
("*"). Actual results could differ materially from those projected in these
forward-looking statements as a result of a variety of factors, including those
set forth below and elsewhere in this Prospectus.

         DEPENDENCE ON ZADAXIN(R) AND CPX. The Company's principal drug
development efforts are currently focused primarily on ZADAXIN and CPX. Clinical
trials of ZADAXIN sponsored by the Company and/or other parties are currently in
progress or planned and favorable results from such trials will be necessary to
gain regulatory approval in major pharmaceutical markets. Sales of ZADAXIN
commenced in 1997. While ZADAXIN has been approved for commercial sale for
treatment of hepatitis B in the People's Republic of China, Kuwait, Myanmar,
Peru, the Philippines and Singapore and for hepatitis C in the Philippines, no
assurance can be given that ZADAXIN approvals will be obtained in additional
countries or for the treatment of additional indications, such as hepatitis C or
cancer, in a timely fashion or at all. The Company's launch of ZADAXIN in the
People's Republic of China, the Philippines and Singapore is the first
commercial introduction of ZADAXIN by the Company, and no assurance can be given
that commercialization of ZADAXIN will prove successful. The Company has not yet
launched ZADAXIN in Argentina, Italy, Kuwait, Myanmar or Peru and no assurance
can be given that future launches of ZADAXIN will prove successful in these
countries or in any additional countries. Future sales of ZADAXIN will depend on
market acceptance and successful distribution. In particular, although the
People's Republic of China has the highest hepatitis B prevalence rate in the
world, the low average income and poorly developed distribution infrastructure
present ongoing challenges to successful commercialization of ZADAXIN in that
market. Because the Company currently relies on ZADAXIN as its sole source of
revenue, the failure to demonstrate the drug's efficacy in future clinical
trials, obtain additional marketing approvals or commercialize the drug
successfully would have a material adverse effect on the Company.

          The Company may experience delays and encounter difficulties in
clinical trials of CPX. In addition, there can be no assurance that any clinical
trial will provide statistically significant evidence of the efficacy of CPX in
treating cystic fibrosis ("CF"). A failure to demonstrate the safety and
efficacy of CPX in a CF clinical trial, obtain regulatory approval of CPX for CF
or successfully commercialize CPX could have a material adverse effect on the
Company.

         NO HISTORY OF SIGNIFICANT REVENUES; CONTINUING OPERATING LOSSES. The
Company has only recently generated revenues from the commercialization of its
lead product, ZADAXIN, and there is substantial uncertainty regarding the
timing and amount of any future revenues and whether such future revenues will
be material. The Company cannot predict when or if marketing approvals for CPX
will be obtained or additional marketing approvals for ZADAXIN will be
obtained. Even if such approvals are obtained, there can be no assurance that
ZADAXIN and CPX will be commercialized successfully. The Company has
experienced significant operating losses since its inception and has a
substantial accumulated deficit. The Company expects its operating expenses to
increase over the next several years as it expands its development, clinical
testing and marketing capabilities. The Company's ability to achieve a
profitable level of operations is dependent in large part on successful
expansion of the market for ZADAXIN in Asia, Latin America and the Middle East,
obtaining additional regulatory approvals for ZADAXIN and/or future products,
entering into a corporate partnering arrangement for development in the U.S.
and Europe, of a combination therapy for hepatitis C including ZADAXIN plus
interferon, entering into other agreements for product development and
commercialization, where appropriate, and continuing to expand from development
into successful marketing. There can be no assurance that the Company will ever
achieve a profitable level of operations.

         FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FINANCING. Since
inception, the Company has financed its operations primarily through sales of
equity securities. The Company will need to obtain additional financing through
sales of equity securities to support its long-term product development and
commercialization 


                                       4
<PAGE>   6
programs. The Company believes its existing capital resources and interest on
funds available are adequate to maintain its current and planned operations at
least through June 1999.* The Company is considering corporate partnering, a
private placement of equity securities, the sale of equity securities under its
equity line and other opportunities to increase its capital resources. However,
the Company's future capital requirements will depend on many factors, including
the level of ZADAXIN product sales, the availability of complementary products,
technologies and businesses, the initiation of preclinical and clinical trials
and testing, the timing and cost of regulatory approvals, patent costs,
competing technological and market developments, the nature of existing and
future collaborative relationships, and the Company's ability to establish
development, sales, manufacturing and marketing arrangements. If additional
funds are raised by the Company through the issuance of equity securities or
securities convertible into or exercisable for equity securities, the percentage
ownership of the then current shareholders of the Company will be reduced. The
Company may issue a series of Preferred Stock with rights, preferences and
privileges senior to those of the Company's Common Stock. There can be no
assurance that such financing will be available on acceptable terms or a timely
basis, if at all. The unavailability or timing of financing could prevent or
delay the Company's long-term product development and commercialization programs
and may require curtailment of operations of the Company. The Company has
negotiated an Equity Line (defined below). Unless the Company and the investor
agree otherwise, the Equity Line is not available when the Company's stock is
trading at less than $1.50 per share. Further, the amount available under the
line is subject to a formula and the amount available in any quarter could be
minimal.

          POTENTIAL IMPAIRMENT OF NOTE RECEIVABLE FROM FORMER CHAIRMAN/CEO. On
July 23, 1997, the Company loaned to Thomas E. Moore, its former Chairman/CEO,
$5,944,000 in exchange for a promise to repay the loan on demand and the pledge
of 1,882,500 shares of SciClone Common Stock owned by Mr. Moore. Because the
market value of this underlying collateral is currently below the face value of
the note, there is the potential that if this value is viewed as more than
temporary, the book value of the note would have to be written down through a
non-cash charge to operations to the underlying value of the collateral. As of
September 30, 1998, the underlying value of the collateral was approximately
$3,407,000, resulting in a potential impairment of approximately $2,537,000.
Under all circumstances, including any potential impairment, Mr. Moore is
obligated to repay the entire balance of the loan plus accrued interest. The
Company is monitoring this matter and will review it thoroughly as of the fiscal
year-end and may be required to make such an adjustment for the quarter ended
December 31, 1998.

          DILUTION; SHARES ELIGIBLE FOR FUTURE SALE. Pursuant to the Equity Line
(defined below), the Company, subject to certain limitations, may issue to the
Selling Shareholder up to $4.0 million of Common Stock during each Investment
Period (defined below)(or $32 million in the aggregate) at a price equal to 97%
of the lowest reported sale price during the four days immediately preceding the
date on which the notice of purchase is delivered by the Selling Shareholder to
the Company. Issuances, if any, of Common Stock pursuant to the Equity Line
would have a dilutive effect on existing holders of Common Stock. In connection
with the Equity Line, the Company also issued to the Selling Shareholder the
Warrant (defined below) to purchase 200,000 shares of Common Stock at $5.53 per
share and may issue the Additional Warrants (defined below) to purchase up to an
additional 300,000 shares of Common Stock at a price equal to 150% of the
weighted average purchase price of the Common Stock purchased during the year
with respect to which the Additional Warrant is issued. The Company also agreed
to issue to the Selling Shareholder, at the end of the term of the Equity Line,
a final Warrant (the "Final Warrant") to purchase a number of shares of Common
Stock equal to 300,000 minus the number of shares of Common Stock subject to
Additional Warrants, if any. The Final Warrant, if issued, will have a term
ending on the same date as the end of the five year term of the Warrant, and an
exercise price per share equal to the lesser of the exercise price per share of
the Warrant or 150% of the closing sale price of the Common Stock on the trading
day immediately prior to the last day of the term of the Equity Line. See "The
Company - Equity Line." The resale by the Selling Shareholder of the Common
Stock that it acquires could depress the market price of the Common Stock.
Moreover, as all the shares to be issued pursuant to the Equity Line as well as
the shares issuable upon exercise of the Warrant and the Additional Warrants
and/or Final Warrant will be available for immediate resale, the prospects of
such sales could further adversely affect the market price for the Common Stock.
In April 1998, the Company issued shares of Series C Preferred Stock (the
"Series C Shares") in a private placement with proceeds of $4,000,000 (before
deducting offering expenses). Under certain conditions, each Series C Share may
convert into substantially more than one share of the Company's Common Stock. If
such events were to occur, the conversion of the Series C Shares would have a
dilutive effect on the common shareholders. At recent market prices, each Series
C Share converts into approximately five shares of Common Stock. The holders of
Series C Shares have recently converted approximately 66% of their Series C
Shares.

          DEPENDENCE ON THIRD PARTIES. The Company's strategy contemplates that
it will enter into various collaborative arrangements with other entities. To
date, the Company has acquired rights to ZADAXIN, CPX and certain other drugs
but is only actively pursuing clinical development of ZADAXIN and CPX. Failure
to license or otherwise acquire rights to additional drugs would result in a
shortage of products for development. In addition, the Company has licensed
exclusive rights to develop and market ZADAXIN in Japan to Schering-Plough K.K.
the Japanese subsidiary of Schering-Plough Corporation. Schering-Plough K.K. has
a substantial commitment to alpha interferon, which is an approved therapy for
hepatitis B and hepatitis C in Japan. There can be no assurance that the
relationship will prove successful or that the Company will be able to negotiate
additional arrangements in the future, including a corporate partnering
arrangement for development in the U.S. and Europe of a combination therapy for
hepatitis C including ZADAXIN plus interferon. The amount and timing of
resources that collaborators devote to their activities with the Company will
not be within the control of the Company and may be affected by financial
difficulties or other factors affecting these third parties. There can be no
assurance that such parties will perform their obligations as expected.
Moreover, the Company's ability to obtain regulatory approval in one country may
be delayed or adversely affected by the timing of regulatory activities and
approvals in one or more other countries, particularly if the Company does not
participate in the regulatory approval process in such other countries.

          FOREIGN SALES AND OPERATIONS. The Company's financial condition in the
near term will be highly dependent on ZADAXIN sales in foreign jurisdictions,
where sales and operations are subject to inherent risks, including difficulties
and delays in obtaining pricing approvals and reimbursement, unexpected changes
in regulatory requirements, tariffs and other barriers, political instability,
difficulties in staffing and managing foreign operations, longer payment cycles,
greater difficulty in accounts receivable collection, currency fluctuations and
potential adverse tax consequences. Certain foreign countries regulate pricing
of pharmaceuticals and such 


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<PAGE>   7

regulation may result in prices significantly below those that would prevail in
a free market. The majority of the Company's current sales are to customers in
the People's Republic of China.

         PATENTS AND PROPRIETARY RIGHTS. The U.S. and most European composition
of matter patents for thymosin alpha 1 have expired. The Company will in the
future have only limited composition of matter patents for thymosin alpha 1 and
this could adversely affect the Company's proprietary rights. However, the
Company owns or has exclusive licenses for use and/or process patents or patent
applications in the U.S., Europe, Japan and other jurisdictions for thymosin
alpha 1, and for CPX in the U.S. and will seek to protect such products from
competition through such patent protection and through other means. The
Company's success is significantly dependent on its ability to obtain patent
protection for its products and technologies and to preserve its trade secrets
and operate without infringing on the proprietary rights of third parties. No
assurance can be given that the Company's pending patent applications will
result in the issuance of patents or that any patents will provide competitive
advantages or will not be invalidated or circumvented by its competitors.
Moreover, no assurance can be given that patents are not issued to, or patent
applications have not been filed by, other companies which would have an adverse
effect on the Company's ability to use, manufacture or market its products or
maintain its competitive position with respect to its products. Numerous patents
and patent applications relating to thymosin alpha 1 are held under exclusive
license and the breach by the Company of the terms of such license could result
in the loss of the Company's rights to such patents and patent applications.
Other companies obtaining patents claiming products or processes useful to the
Company may bring infringement actions against the Company and such litigation
is typically costly and time-consuming. As a result, the Company may be required
to obtain licenses from others or not be able to use, manufacture or market its
products. Such licenses may not be available on commercially reasonable terms,
if at all.

         The patent positions of biotechnology firms generally are highly
uncertain and involve complex legal and factual questions. No consistent policy
has emerged regarding the validity and scope of claims in biotechnology patents,
and courts have issued varying interpretations in the recent past, and legal
standards concerning validity, scope and interpretations of claims in
biotechnology patents may continue to evolve. Even issued patents may later be
modified or revoked by the U.S. Patent and Trademark Office, the European Patent
Office or the courts in proceedings instituted by third parties. Moreover, the
issuance of a patent in one country does not assure the issuance of a patent
with similar claims in another country and claim interpretation and infringement
laws vary among countries, so the extent of any patent protection is uncertain
and may vary in different countries.

         Pharmaceuticals are not patentable in certain countries in SciClone's
ZADAXIN territory, or have only recently become patentable, and enforcement of
intellectual property rights in many countries in such territory has been
limited or non-existent. Future enforcement of patents and proprietary rights in
many countries in SciClone's ZADAXIN territory can be expected to be problematic
or unpredictable. There can be no assurance that any patents issued or licensed
to the Company will provide it with competitive advantages or will not be
challenged by others. No assurance can be given that holders of patents licensed
to the Company will file, prosecute, extend or maintain their patents in
countries where the Company has rights. Furthermore, there can be no assurance
that others will not independently develop similar products or will not design
around patents issued or licensed to the Company.

         GOVERNMENT REGULATION AND PRODUCT APPROVALS. The research, preclinical
and clinical development, manufacturing, marketing and sales of pharmaceuticals,
including ZADAXIN, CPX and the Company's other drug candidates, are subject to
extensive regulation by governmental authorities. Products developed by the
Company cannot be marketed commercially in any jurisdiction in which they have
not been approved. The process of obtaining regulatory approvals is lengthy and
requires the expenditure of substantial resources. In some countries where the
Company contemplates marketing ZADAXIN, the regulatory approval process for
drugs not previously approved in countries that have established clinical trial
review procedures is uncertain and this uncertainty may result in delays in
granting regulatory approvals. The Company is currently sponsoring clinical
trials and pursuing regulatory approvals of ZADAXIN in a number of countries and
is currently sponsoring clinical trials of CPX in the U.S., but there can be no
assurance that the Company will be 


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<PAGE>   8

able to complete such trials, that such trials, if completed, will fulfill
regulatory approval criteria or that the Company will ultimately obtain
approvals in such countries. Adverse results in the Company's development
programs also could result in the placement of restrictions on the use of
ZADAXIN and, if approved, CPX. The marketing approval for ZADAXIN in Singapore
requires a patient surveillance program to continue study of the drug's safety
and efficacy. Adverse results in such program could result in the placement of
restrictions on the use of ZADAXIN or revocation of the approval in Singapore.
Failure to comply with the applicable U.S. or foreign regulatory requirements
can, among other things, result in Warning Letters, fines, suspensions of
regulatory approvals, product recalls or seizures, operating restrictions,
injunctions and criminal prosecutions. Further, additional government regulation
may be established or imposed which could prevent or delay regulatory approval
of ZADAXIN, CPX or any future products of the Company.

         MANUFACTURING. The Company has entered into contract manufacturing and
supply agreements to source ZADAXIN and CPX. The Company has experienced delays
of supply of ZADAXIN bulk drug in the past and could do so again in the future.
To be successful, the Company's products must be manufactured in commercial
quantities in compliance with regulatory requirements and at an acceptable cost.
While the Company believes it has and will be able in the future to establish
manufacturing relationships with experienced suppliers capable of meeting the
Company's needs, there can be no assurance that the Company will establish long
term manufacturing relationships with suppliers or that these suppliers will
prove satisfactory. The Company currently has vialing and packaging supply
agreements in effect and has a sufficient supply of finished ZADAXIN for the
near term. The Company has recently changed and upgraded its manufacturing
source of finished ZADAXIN for its international markets, excluding Japan. In
certain countries, this change may require additional regulatory approvals. If
regulatory approvals of such manufacturing change, if required, are not obtained
in a timely fashion, new ZADAXIN marketing approvals may be delayed or sales may
be interrupted until the manufacturing change is approved. Production
interruptions, if they occur, could significantly delay clinical development of
potential products, reduce third party or clinical researcher interest and
support of proposed clinical trials. Such interruptions could also delay
commercialization of the Company's products and impair their competitive
position, which would have a material adverse effect on the business and
financial condition of the Company.

         MARKETING AND SALES. The Company has established distribution
arrangements with local pharmaceutical distribution companies covering countries
in Asia, Latin America and the Middle East. However, no assurance can be given
that any such distribution arrangements will remain in place or prove
successful.

         TECHNOLOGICAL CHANGE AND COMPETITION. Rapid technological development
may result in the Company's products becoming obsolete before they are marketed
or before the Company recovers a significant portion of the related development
and commercialization expenses. Competition in the pharmaceutical field is
intense and the Company expects that competition will increase. The Company's
competitors include major pharmaceutical companies, biotechnology firms and
universities and other research institutions, both in the U.S. and abroad, that
are actively engaged in research and development of products in the therapeutic
areas being pursued by the Company. Many of these companies and institutions
have substantially greater financial, technical, manufacturing, marketing and
human resource capabilities than the Company and extensive experience in
undertaking clinical testing and obtaining regulatory approvals necessary to
market drugs. Principal competitive factors in the pharmaceutical field include
efficacy, safety, price and therapeutic regimen. Where comparable products are
marketed by other companies price is also a competitive factor.

         UNCERTAINTY OF THIRD PARTY REIMBURSEMENT; RESOURCES OF PATIENT
POPULATIONS. The Company's ability to successfully commercialize its products
may depend in part on the extent to which reimbursement for the cost of such
products will be available from government health administration authorities,
private health insurers and other organizations. Significant uncertainty exists
as to the reimbursement status of new therapeutic products and there can be no
assurance that third party reimbursement will be available for therapeutic
products the Company might develop. In many of the foreign countries in which
the Company intends to operate, reimbursement of ZADAXIN under government or
private health insurance programs will not be available. In the U.S., health
care reform is an area of increasing national attention and a priority of many
governmental officials. Certain reform proposals, if adopted, could impose
limitations on the prices the Company will be able to charge in the U.S. for its
products or the amount of reimbursement for the Company's products from
governmental agencies or third party payors. In many countries where the Company
has marketing rights for ZADAXIN, government resources and per capita income
levels may be so low that the Company's products will be prohibitively expensive
for a large percentage of the population. In such countries, there can be no
assurance that the Company will be successful in marketing its products on
economically favorable terms, if at all.



                                       7
<PAGE>   9

         DEPENDENCE ON QUALIFIED PERSONNEL AND KEY INDIVIDUALS. Because of the
specialized scientific and international nature of the Company's business, the
Company is highly dependent upon its ability to continue to attract and retain
qualified management, scientific and technical personnel. There is intense
competition for qualified personnel in the areas of the Company's activities,
and there can be no assurance that the Company will be able to continue to
attract and retain the qualified personnel necessary for the development of its
business. In addition, many key responsibilities within the Company have been
assigned to a relatively small number of individuals. Loss of the services of
any of these individuals unless they were promptly replaced could be
significantly detrimental to the Company's development. The Company does not
maintain key person life insurance on the lives of any of its key personnel.

         PRODUCT LIABILITY; ABSENCE OF INSURANCE. The Company's business will
expose it to potential product liability risks which are inherent in the
testing, manufacturing, marketing and sale of pharmaceutical products, and there
can be no assurance that product liability claims will not be asserted against
the Company. Product liability insurance for the pharmaceutical industry
generally is expensive to the extent that it is available at all. The Company
has product liability insurance coverage for clinical trials and commercial
sales. However, there can be no assurance that a product liability claim would
not adversely affect the business or financial condition of the Company.

         PREFERRED STOCK. The Company's Board of Directors has the authority to
issue additional series of preferred stock and to determine the price, rights,
preferences, privileges and restrictions, including voting rights, without any
further vote or action by the Company's shareholders. The rights of the holders
of the Common Stock will be subject to, and may be adversely affected by, the
rights of the holders of any Preferred Stock that may be issued in the future.
The issuance of Preferred Stock, while providing desirable flexibility in
connection with possible acquisitions and other corporate purposes, could have
the effect of making it more difficult for a third party to acquire a majority
of the outstanding voting stock of the Company.


                                   THE COMPANY

         This Prospectus is accompanied by a copy of the Company's Annual Report
on Form 10-K for the year ended December 31, 1997 and the Quarterly Report on
Form 10-Q for the most recent fiscal quarter after the year ended December 31,
1997.

GENERAL

         SciClone Pharmaceuticals, Inc. ("SciClone" or the "Company") is a
global biopharmaceutical company that acquires, develops, and commercializes
specialist-oriented drugs for treating chronic and life-threatening diseases
such as hepatitis B, hepatitis C, cancer, immune system disorders and cystic
fibrosis. SciClone has two drugs in clinical development, ZADAXIN(R) thymosin
alpha 1 and CPX, and has other drug candidates in preclinical development.

         ZADAXIN thymosin alpha 1, an immunomodulator (i.e., a drug that boosts
the immune system), is the Company's lead drug, targeting hepatitis B, hepatitis

C, cancer, viral vaccine enhancement and certain immune system disorders.
ZADAXIN is approved and marketed in the People's Republic of China, the
Philippines and Singapore for treatment of hepatitis B, one of the most common
chronic infectious diseases in the world. In 1998, ZADAXIN was approved in
Kuwait, Myanmar and Peru for treatment of hepatitis B, in the Phillippines for
treatment of hepatitis C in combination with alpha-interferon and in Argentina
for use as an influenza vaccine adjuvant. ZADAXIN is also approved in Italy for
use as an influenza vaccine adjuvant. ZADAXIN has now been approved in each of
the three primary regions SciClone has targeted for hepatitis B sales -- Asia,
Latin America and the Middle East. The Company has filed for approval to market
ZADAXIN in additional countries in Asia, Latin America and the Middle East.
SciClone has worldwide marketing, development and manufacturing rights to
ZADAXIN, except in Japan, where the Company's rights have been sublicensed to
Schering-Plough K.K., the Japanese subsidiary of Schering-Plough Corporation, a 
leading marketer of viral hepatitis therapies worldwide.
        


                                       8
<PAGE>   10
         The Company is pursuing a corporate partnering agreement for
development in the U.S. and Europe of a combination therapy for hepatitis C
including ZADAXIN plus interferon.* Hepatitis C is a worldwide
epidemic affecting over 170 million people including over ten million people in
the U.S., Europe and Japan, the world's largest pharmaceutical markets. Clinical
data demonstrate that the combination of ZADAXIN plus interferon could be a
significant therapeutic advance in the fight against hepatitis C. Interferon,
the only established first-line therapy to treat hepatitis C, leads to a
sustained response in only 5% to 20% of patients and causes unpleasant side
effects.

         In Japan, the world's leading market for viral hepatitis therapies, the
Company has licensed exclusive development and marketing rights to ZADAXIN to
Schering-Plough K.K. In the second quarter of 1998, Schering-Plough K.K. started
a 300-patient phase 3 ZADAXIN hepatitis B trial in Japan. Schering-Plough K.K.
also is developing ZADAXIN in a phase 2 hepatitis C study.

         In Italy, a ZADAXIN market application for treatment of non small-cell
lung cancer is pending.

         CPX is SciClone's second drug in clinical development. CPX is an orally
administered protein-repair therapy initially developed by and licensed by
SciClone from the U.S. National Institutes of Health ("NIH") as a potential
treatment for cystic fibrosis ("CF"). SciClone acquired an exclusive license to
CPX from the NIH. CF is caused by mutations in the gene that encodes the cystic
fibrosis transmembrane conductance regulator ("CFTR") protein. More than 70% of
CF patients have the delta F508 genetic mutation. In October 1997, Harvey
Pollard, M.D., Ph.D, of the Uniformed Services University of the Health Sciences
and formerly of the NIH, presented breakthrough new preclinical data
demonstrating that CPX corrects the two key protein defects causing CF in
patients with the F508 mutation - impaired chloride ion transport and abnormal
CFTR protein trafficking. These preclinical data indicate that CPX is the only
drug in clinical development with the potential to correct the two key protein
defects in most CF patients. The Company has obtained orphan drug designation
for CPX from the United States Food and Drug Administration ("FDA"). In 1997,
the FDA awarded the Company a $100,000 research grant for phase 1 development of
CPX. The Company completed phase 1 development of CPX in CF patients in April
1998. In October 1998, the FDA awarded SciClone a $200,000 research grant for
phase 2 development of CPX. The Company started phase 2 development in   CF
patients in the    third quarter of 1998.
        
EQUITY LINE

         The Company and the Selling Shareholder entered into the Structured
Equity Line Flexible Financing(SM) Agreement (the "Equity Line"), dated as of
June 30, 1998 and a related Registration Rights Agreement (the "Registration
Rights Agreement"), dated as of June 30, 1998 whereby the Company agreed to file
under the Securities Act a registration statement (the "Registration Statement")
covering resales from time to time, by the Selling Shareholder of shares of
Common Stock. This Prospectus is a part of the Registration Statement. Pursuant
to the terms of the Equity Line, subject to the satisfaction of certain
conditions, the Company may require the Selling Shareholder to purchase shares
of Common Stock over a period of 24 months from the effective date of the
Registration Statement, for an aggregate purchase price of up to $32 million.
The Company may terminate the Equity Line at any time without further obligation
to the Selling Shareholder and the Selling Shareholder may terminate the Equity
Line without further obligation to the Company if and only if any change in law
makes it impracticable or impossible for the Selling Stockholder to fulfill its
obligations under the Equity Line. Under the terms of the Equity Line, during
each three month period (each, an "Investment Period") following the effective
date of the Registration Statement, the Company at its sole option and
discretion, subject to the satisfaction of certain conditions, can require the
Selling Shareholder to purchase shares of Common Stock for an aggregate purchase
price of up to $4.0 million. Ten (10) days prior to the beginning of each
Investment Period, the Company is required to notify the Selling Shareholder of
the minimum purchase price per share to be paid for shares of Common Stock
required to be purchased by the Selling Shareholder, if any, during such
Investment Period, provided that the Company may reset such minimum price to a
value within fifteen percent (15%) of such minimum price up to three times
during any Investment Period. The purchase price per share to be paid by the
Selling Shareholder for the shares of Common Stock acquired under the Equity
Line will equal 97% of the lowest sales 


                                       9
<PAGE>   11

price of the Common Stock during the four trading days immediately preceding the
notice of purchase by the Selling Shareholder.

         The Selling Shareholder's obligation to purchase shares of Common Stock
under the Equity Line is subject to various conditions, including, among other
things: (i) effectiveness of the Registration Statement under the Securities
Act; (ii) the price of the Common Stock being equal to at least the price the
Company sets from time to time as the minimum purchase price; (iii) continued
trading of the Common Stock on the Nasdaq National Market; and (iv) the
percentage of the Common Stock beneficially owned by the Selling Shareholder and
its affiliates being not more than 4.9% of the Company's then outstanding Common
Stock. In addition, the Selling Shareholder is not required to purchase, in any
Investment Period, an amount in excess of 10% (in the first Investment Period,
with such percentage reduced by 1% in each succeeding Investment Period until
such percentage reaches 6% at which time it will be fixed at 6%) of the product
of (i) the daily average value of open market trading of the Common Stock and
(ii) the number of trading days in the Investment Period during either the
current or immediately preceding Investment Period.

         In connection with the Equity Line, the Selling Shareholder received a
five-year warrant (the "Warrant") to purchase 200,000 shares of the Common Stock
at an exercise price equal to $5.53 per share. In addition, the Company has
agreed to issue to the Selling Shareholder, at the end of each calendar year an
additional Warrant (each, an "Additional Warrant" and collectively, the
"Additional Warrants") to purchase Common Stock in an amount equal to 5,000
shares for each $500,000 of Common Stock purchased by the Selling Shareholder
during such year, with an exercise price equal to 150% of the weighted average
purchase price of the Common Stock purchased by the Selling Shareholder during
such year, provided that the number of shares issuable upon exercise of all the
Additional Warrants will not exceed 300,000. The Additional Warrants, if any,
have a term ending on the same date as the end of the five-year term of the
Warrant. The Company also agreed to issue to the Selling Shareholder, at the end
of the term of the Equity Line, a final Warrant (the "Final Warrant") to
purchase a number of shares of Common Stock equal to 300,000 minus the number of
shares of Common Stock subject to Additional Warrants, if any. The Final
Warrant, if issued, will have a term ending on the same date as the end of the
five year term of the Warrant, and an exercise price per share equal to the
lesser of the exercise price per share of the Warrant or 150% of the closing
sale price of the Common Stock on the trading day immediately prior to the last
day of the term of the Equity Line. The Company also agreed to reimburse the
Selling Shareholder for its legal fees and expenses incurred in connection with
entering into the Equity Line up to a maximum of $50,000, and for its costs and
expenses incurred in connection with the performance of its obligations under
the Equity Line up to a maximum of $25,000 initially and $5,000 quarterly
thereafter.

         Under the Equity Line and the related Registration Rights Agreement,
the Company agreed to file and maintain the effectiveness of (subject to certain
penalties for non-compliance which may be waived by the Selling Shareholder) a
registration statement under the Securities Act, of which this Prospectus is a
part, for the resale from time to time by the Selling Shareholder of the shares
of the Common Stock to be issued under the Equity Line and upon exercise of the
Warrant and the Additional Warrants.


OTHER INFORMATION

         The Company was incorporated in California in 1990. Its principal
executive offices are located at 901 Mariners Island Boulevard, Suite 205, San
Mateo, California 94404, and its telephone number is (650) 358-3456. The
Company's international operating subsidiary, SciClone Pharmaceuticals
International Ltd. ("SciClone International"), is incorporated in the Cayman
Islands and headquartered in Hong Kong. The Company also has office locations in
Singapore, Taiwan and Japan.




                                       10
<PAGE>   12

                                 USE OF PROCEEDS

         The Company will receive proceeds from the original issuance of the
Shares, if any, to the Selling Shareholder under the Equity Line and may receive
proceeds from the exercise of the Warrant and the Additional Warrants and/or
Final Warrant but will not receive any of the proceeds from resales by the
Selling Shareholder of the Shares offered by this Prospectus. The Company could
receive, before expenses, up to $32 million under the Equity Line and up to
$1,106,000 upon exercise of the Warrant. In addition, the Selling Shareholder
may receive Additional Warrants and/or a Final Warrant to purchase up to an
aggregate of 300,000 shares of Common Stock. The amount of gross proceeds
received will depend on the exercise price of the Additional Warrants, which is
specified in the Equity Line as 150% of the weighted average purchase price of
the Common Stock purchased during the year with respect to which an Additional
Warrant is issued. The amount of gross proceeds received will also depend on the
exercise price of the Final Warrant, if issued, which is specified in the Equity
Line as equal to the lesser of the exercise price per share of the Warrant or
150% of the closing sale price of the Common Stock on the trading day
immediately prior to the last day of the term of the Equity Line. The actual
amount of proceeds, if any, from the Equity Line, the Warrant and the Additional
Warrants and/or Final Warrant will depend upon the market price of the Common
Stock, whether the Selling Shareholder elects to exercise the Warrant and the
Additional Warrants and/or Final Warrant and whether the Company elects to
require the Selling Shareholder to purchase Common Stock under the terms of the
Equity Line. However, there can be no assurance that the Company will issue any
Shares under the Equity Line or receive any proceeds from the Equity Line and,
under the terms of the Equity Line, it is possible that no Shares will be issued
to or resold by the Selling Shareholder under this Prospectus. For a description
of the terms of the Equity Line, the Warrant and the Additional Warrants and/or
Final Warrant, see "The Company - Equity Line."

         The Company expects that any net proceeds from issuances of Common
Stock to the Selling Shareholder pursuant to the Equity Line, or exercise of the
Warrant and the Additional Warrants and/or Final Warrant will be used for
general corporate purposes, including research and development, marketing,
sales, and clinical and regulatory activities.


                               SELLING SHAREHOLDER

   
         The Selling Shareholder, Cheyenne, LLC, has not had a material
relationship with the Company within the past three years, other than as a
result of entering into the Equity Line and related agreements. See "The Company
- - Equity Line." Jeffrey E. Devers is the sole managing member of Cheyenne, LLC.
However, one of the Selling Shareholder's members, The Palladin Group, L.P., is
or was an investment advisor for several entities which purchased an aggregate
of $4.0 million of the Company's Series C preferred stock on April 1, 1998. The
Palladin Group, L.P. also may act as a broker on behalf of the Selling
Shareholder in connection with this offering.
    

         As of the date hereof, the Selling Shareholder does not own any shares
of the Common Stock, other than the Shares which it has the right to acquire
upon exercise of the Warrant and is offering hereby up to 3,000,000 of the
shares of Common Stock it may acquire pursuant to the Equity Line and the
Warrant and the Additional Warrants and/or Final Warrant.


                              PLAN OF DISTRIBUTION

         The Selling Shareholder may, from time to time, sell all or a portion
of the Shares on the NNM (or such other exchange on which the Common Stock may
from time to time be trading), in privately negotiated transactions or
otherwise, at fixed prices that may be changed, at market prices prevailing at
the time of sale, at prices related to such market prices or at negotiated
prices. The Shares may be sold by the Selling Shareholder by one or more of the
following methods, without limitation: (a) block trades in which the broker or
dealer so engaged will attempt to sell the Shares 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, (c) an exchange distribution in
accordance with the rules of such exchange, (d) ordinary brokerage transactions
and transactions in which the broker solicits purchasers, (e) privately
negotiated transactions, (f) short sales and (g) a combination of any such
methods of sale. In effecting sales, brokers and dealers engaged by the Selling
Shareholder may arrange for other brokers or dealers to participate. Brokers or
dealers may receive commissions or discounts from the Selling Shareholder (or,
if any such broker-dealer acts as agent for the purchaser of such Shares, from
such purchaser) in amounts to be negotiated which are not expected to exceed
those customary in the types of transactions involved. Broker-dealers may agree
with the Selling Shareholder to sell a 



                                       11
<PAGE>   13

specified number of such Shares at a stipulated price per share, and, to the
extent such broker-dealer is unable to do so acting as agent for a Selling
Shareholder, to purchase as principal any unsold Shares at the price required to
fulfill the broker-dealer commitment to the Selling Shareholder. Broker-dealers
who acquire Shares as principal may thereafter resell such Shares from time to
time in transactions (which may involve block transactions of the nature
described above) in the over-the-counter market or otherwise at prices and on
terms then prevailing at the time of sale, at prices then related to the
then-current market price or in negotiated transactions and, in connection with
such resales, may pay to or receive from the purchasers of such Shares
commissions as described above. The Selling Shareholder may also sell the
Shares in accordance with Rule 144 under the Securities Act, rather than
pursuant to this Prospectus.

   
         The Selling Shareholder is an "underwriter" as defined in the 
Securities Act of 1933 (the "Securities Act") in connection with the sale of 
the Shares offered hereby. Any broker-dealers or agents that participate
with the Selling Shareholder in sales of the Shares may be deemed to be
"underwriters" within the meaning of the Securities Act in connection with such
sales. In such event, any commissions received by such broker-dealers or agents
and any profit on the resale of the Shares purchased by them may be deemed to be
underwriting commissions or discounts under the Securities Act.
    

         From time to time the Selling Shareholder may engage in short sales,
short sales against the box, puts and calls and other transactions in securities
of the Company or derivatives thereof, and may sell and deliver the Shares in
connection therewith or in settlement of securities loans. If the Selling
Shareholder engages in such transactions, the Conversion Price may be affected.
Pursuant to the Equity Line, the Selling Shareholder may not make any sales with
the intention of reducing the price of the Common Stock. From time to time the
Selling Shareholder may pledge its Shares pursuant to the margin provisions of
its customer agreements with its brokers. Upon a default by the Selling
Shareholder, the broker may offer and sell the pledged Shares from time to time.

         The Selling Shareholders and any other persons participating in the
sale or distribution of the Shares will be subject to provisions of the Exchange
Act and the rules and regulations thereunder, including Regulation M, to the
extent applicable, which provisions may limit the timing of purchases and sales
of any of the Shares by the Selling Shareholder or any other such person. The
foregoing may affect the marketability of the Shares. The Selling Shareholder
also will comply with the applicable prospectus delivery requirements under the
Securities Act in connection with the sale or distribution of the Shares
hereunder.

         The Company is required to pay certain fees and expenses incident to
the registration of the Shares.

         The Company has agreed to indemnify in certain circumstances the
Selling Shareholder against certain liabilities, including liabilities under
the Securities Act. The Selling Shareholder has agreed to indemnify in certain
circumstances the Company against certain liabilities, including liabilities
under the Securities Act.

         The Company has agreed to use its best efforts to keep the Registration
Statement, of which this Prospectus constitutes a part, effective until the
Shares may be or have been sold pursuant to Rule 144(k) of the Securities Act.


                                  LEGAL MATTERS

         Certain legal matters with respect to the validity of the Common Stock
offered hereby have been passed upon for the Company by Gray Cary Ware &
Freidenrich LLP.


                                     EXPERTS

         The consolidated financial statements and schedule of the Company
appearing in its Annual Report (Form 10-K) for the year ended December 31, 1997
have been audited by Ernst & Young LLP, independent auditors, as set forth in
their report thereon, included therein and incorporated herein by reference.
Such consolidated financial statements and schedule are incorporated herein by
reference in reliance upon such report given upon the authority of such firm as
experts in accounting and auditing.



                                       12
<PAGE>   14

================================================================================

NO DEALER, SALESMAN OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION
OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING DESCRIBED HEREIN,
AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION 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, ANY
SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH IT RELATES, OR AN OFFER
TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, IN ANY JURISDICTION IN WHICH IT
IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN
IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE
THE DATE HEREOF OR THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY
TIME SUBSEQUENT TO THE DATE HEREOF.
                                                                        

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                             PAGE
                                                                             ----
<S>                                                                          <C>

Available Information....................................................      3
Incorporation of Certain Documents By
    Reference............................................................      3
Risk Factors ............................................................      4
The Company .............................................................      8
Use of Proceeds .........................................................     11
Selling Shareholder......................................................     11
Plan of Distribution.....................................................     11
Legal Matters ...........................................................     12
Experts .................................................................     12

</TABLE>

                                3,000,000 SHARES
                                        
                                        
                                        
                         SCICLONE PHARMACEUTICALS, INC.
                                        
                                        
                                        
                                  COMMON STOCK
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                   PROSPECTUS
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                                        
                               ____________, 1998
                                        
                                        
                                        
                                        
                                        



================================================================================

<PAGE>   15

                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

         The following table sets forth the costs and expenses in connection
with the sale and distribution of the securities being registered, other than
underwriting discounts and commissions. All of the amounts shown are estimates
except the Securities and Exchange Commission registration fees and Nasdaq
filing fee.

<TABLE>
<CAPTION>
                                                                        To be Paid
                                                                          By The
                                                                        Registrant
                                                                        ----------
<S>                                                                      <C>    
SEC Registration Fee ..................................                  $ 2,544
Nasdaq filing fee .....................................                  $17,500
Accounting fees and expenses ..........................                  $ 7,000
Legal fees and expenses ...............................                  $15,000
Miscellaneous expenses ................................                  $ 2,956

         Total ........................................                  $45,000
                                                                         =======

</TABLE>

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

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         As permitted by Section 204 of the California Corporations Code (the
"CCC"), the Registrant's Articles of Incorporation provide that each person who
is or was or who had agreed to become a director or officer of the Registrant or
who had agreed at the request of the Registrant's Board of Directors or an
officer of the Registrant to serve as an employee or agent of the Registrant or
as a director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise, shall be indemnified by the Registrant
to the full extent permitted by the CCC or any other applicable laws. Such
Articles of Incorporation also provide that no amendment or repeal of such
Articles shall apply to or have any effect on the right to indemnification
permitted or authorized thereunder for or with respect to claims asserted before
or after such amendment or repeal arising from acts or omissions occurring in
whole or in part before the effective date of such amendment or repeal.

         The Registrant's Bylaws provide that the Registrant shall indemnify to
the full extent authorized by law any person made or threatened to be made a
party to an action or a proceeding, whether criminal, civil, administrative or
investigative, by reason of the fact that he, his testator or intestate was or
is a director, officer or employee of the Registrant or any predecessor of the
Registrant or serves or served any other enterprise as a director, officer or
employee at the request of the Registrant or an predecessor of the Registrant.
The Registrant's Bylaws also provide that the Registrant may enter into one or
more agreements with any person which provides for indemnification greater or
different than that provided in such Articles of Incorporation.

         The Registrant has entered into indemnification agreements with its
directors and certain of its officers.

         The Registrant intends to purchase and maintain insurance on behalf of
any person who is a director or officer against any loss arising from any claim
asserted against him and incurred by him in any such capacity, subject to
certain exclusions.

         See also the undertakings set out in response to Item 17 herein.

                                      II-1

<PAGE>   16

ITEM 16.  EXHIBITS.

         The following exhibits are filed with this Registration Statement:

<TABLE>
<CAPTION>
      EXHIBIT NO.                 DESCRIPTION OF EXHIBIT
      ----------- --------------------------------------------------------------

<S>               <C>                                                  
          5.1**   Opinion of Gray Cary Ware & Freidenrich LLP.

         10.1*    Structured Equity Line Flexible Financing(SM) Agreement by and
                  between the Company and Cheyenne LLC dated as of June 30,
                  1998.

         10.2*    Warrant to purchase up to 200,000 shares of Common Stock of
                  the Company issued to Cheyenne LLC dated as of June 30, 1998.

         10.3*    Registration Rights Agreement by and between the Company and
                  Cheyenne LLC dated as of June 30, 1998.

         23.1     Consent of Ernst & Young LLP, independent auditors.

         23.2**   Consent of Gray Cary Ware & Freidenrich LLP (included in
                  Exhibit 5.1).

         24.1**   Power of Attorney (included in the Signature Page contained in
                  Part II of the Registration Statement).
</TABLE>

 *       Incorporated by reference from the Company's Report on Form 8-K filed
         with the Commission on July 23, 1998.

**       Previously filed.

ITEM 17.  UNDERTAKINGS.

         A. 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 (the "Securities 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 the
registration statement. Notwithstanding the foregoing, any increase or decrease
in volume of securities offered (if the total dollar value of securities offered
would not exceed that which was registered) and any deviation from the low or
high end of the estimated maximum offering range may be reflected in the form of
prospectus filed with the Commission pursuant to Rule 424(b) if, in the
aggregate, the changes in volume and price represent no more than a 20% change
in the maximum aggregate offering price set forth in the "Calculation of
Registration Fee" table in the effective 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 paragraphs (a)(1)(i) and (a)(1)(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


                                      II-2

<PAGE>   17

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, 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.

         B. Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers, and controlling persons
of the Registrant pursuant to the foregoing provisions, 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 public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.

         C. The undersigned Registrant hereby undertakes that:

                  (1) For the purposes of determining any liability under the
Securities Act, the information omitted from the form of prospectus filed as
part of this registration statement in reliance upon Rule 430A and contained in
a form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4)
or 497(h) under the Securities Act shall be deemed to be part of the
registration statement as of the time it was declared effective.

                  (2) For the purposes of determining any liability under the
Securities 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.


                                      II-3

<PAGE>   18

                                   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-2 and has duly caused this Amendment
No. 3 to registration statement to be signed on its behalf by the undersigned,
thereunto duly authorized in the City of San Mateo, State of California on
December 3, 1998.
    

                                        SCICLONE PHARMACEUTICALS, INC.



                                        By: /s/ Donald R. Sellers
                                           -------------------------------------
                                           Donald R. Sellers
                                           President and Chief Executive Officer


         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:


<TABLE>
<CAPTION>
   
      SIGNATURE                                              TITLE                                 DATE
      ---------                                              -----                                 ----
<S>                                           <C>                                               <C> 
 /s/ Donald R. Sellers
- --------------------------------------
Donald R. Sellers                             President, Chief Executive Officer and            December 3, 1998
                                              Director (Principal Executive Officer)

- --------------------------------------
Jere E. Goyan, Ph.D.*                         Chairman of the Board and Director                December 3, 1998


- --------------------------------------
Diane Lee*                                    Director, Corporate Finance and Administration    December 3, 1998
                                              (Principal Financial and Accounting Officer)

- --------------------------------------
John D. Baxter, M.D.*                         Director                                          December 3, 1998


- --------------------------------------
Edwin C. Cadman, M.D.*                        Director                                          December 3, 1998


- --------------------------------------
Rolf H. Henel*                                Director                                          December 3, 1998


*By:  /s/ Donald R. Sellers
      --------------------------------
      Donald R. Sellers,                                                                        December 3, 1998    
      Attorney-in-fact
    

</TABLE>

                                      II-4

<PAGE>   19






                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
      EXHIBIT NO.                 DESCRIPTION OF EXHIBIT
      ----------- --------------------------------------------------------------

<S>               <C>                                                  
          5.1**   Opinion of Gray Cary Ware & Freidenrich LLP.

         10.1*    Structured Equity Line Flexible Financing(SM) Agreement by and
                  between the Company and Cheyenne LLC dated as of June 30,
                  1998.

         10.2*    Warrant to purchase up to 200,000 shares of Common Stock of
                  the Company issued to Cheyenne LLC dated as of June 30, 1998.

         10.3*    Registration Rights Agreement by and between the Company and
                  Cheyenne LLC dated as of June 30, 1998.

         23.1     Consent of Ernst & Young LLP, independent auditors.

         23.2**   Consent of Gray Cary Ware & Freidenrich LLP (included in
                  Exhibit 5.1).

         24.1**   Power of Attorney (included in the Signature Page contained in
                  Part II of the Registration Statement).
</TABLE>

 *       Incorporated by reference from the Company's Report on Form 8-K filed
         with the Commission on July 23, 1998.

**       Previously filed.



<PAGE>   1
                                                                    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-2, Amendment No. 3 and related Prospectus of
SciClone Pharmaceuticals, Inc. for the registration of 3,000,000 shares of its
Common Stock and to the incorporation by reference therein of our report dated
January 16, 1998, except Note 10, as to which date is April 2, 1998, with
respect to the consolidated financial statements and schedule of SciClone
Pharmaceuticals, Inc. included in its Annual Report on Form 10-K/A for the year
ended December 31, 1997 filed with the Securities and Exchange Commission.


/s/ Ernst & Young LLP

Palo Alto, California
December 3, 1998








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