Exhibit 99.1

                                                                 (QUESTCOR LOGO)

FOR IMMEDIATE RELEASE

COMPANY CONTACT:                                            INVESTORS AND MEDIA:
Questcor Pharmaceuticals, Inc.                              Investor Relations
Charles J. Casamento                                        510/400-0706
Chairman, President & CEO
Timothy E. Morris, CFO
510/400-0700

                    QUESTCOR ANNOUNCES FINANCIAL RESULTS FOR
                  THE QUARTER AND YEAR ENDED DECEMBER 31, 2003

   Questcor reports net income of $324,000 on total revenues of $4,570,000 in
                           the fourth quarter of 2003

UNION CITY, CA - MARCH 3, 2004 -- QUESTCOR PHARMACEUTICALS, INC. (AMEX:QSC), a
specialty pharmaceutical company that acquires, develops, markets and sells
brand name prescription drugs through a U.S. direct sales force and
international commercialization partners, announced today financial results for
the fourth quarter and the year ended December 31, 2003. Questcor reported total
revenues of $4,570,000 in the fourth quarter of 2003, an increase of 15% over
the third quarter of 2003, and net income of $324,000. This is the first time
since Questcor's merger with RiboGene, Inc. in November 1999 that it has
reported a profit. Questcor also reported non-GAAP earnings before net interest
income (expense), taxes, depreciation and amortization, and non-cash
amortization of deemed discount on convertible debentures (defined by Questcor
as "EBITDA") of $862,000 in the fourth quarter of 2003.

FISCAL YEAR 2003 ACCOMPLISHMENTS

The year ended December 31, 2003 was marked by a number of achievements by
Questcor. Some of the accomplishments included:

      -     Generating a profit in the fourth quarter of 2003: In the fourth
            quarter of 2003, Questcor reported net income of $324,000.

      -     Three consecutive quarters of increasing revenues: In the first
            quarter of 2003, net product sales declined substantially as
            compared to the first quarter of 2002. Given this decline, Questcor
            took actions during 2003 which contributed to an increase of 22% in
            net product sales in the second quarter to $2,880,000. The net
            product sales again increased 37% in the third quarter to
            $3,943,000. The net product sales continued to increase and rose 13%
            to $4,470,000 for the fourth quarter of 2003, which were the highest
            quarterly net product sales ever reported by Questcor.

      -     Achieving positive EBITDA in third and fourth quarter of 2003: In
            the fourth quarter, Questcor achieved positive EBITDA of $862,000
            and, in the third quarter, positive EBITDA of $13,000. An increase
            in revenues from sales of Nascobal and cost containment measures
            allowed Questcor to achieve positive EBITDA in the third and fourth
            quarter of 2003.

      -     Acquisition of Nascobal: In June 2003, Questcor purchased Nascobal
            (cyanocobalamin, USP) from Nastech Pharmaceutical Company. Nascobal
            is an intranasal gel formulation for the treatment of vitamin B-12
            deficiency associated with Crohn's Disease, Multiple Sclerosis, HIV,
            and other diseases which contribute to a malabsorptive state.
            Questcor began shipping Nascobal in July 2003 and began promoting it
            through its internal sales force in October 2003. In August 2003,
            the FDA approved the use of Nascobal as first-line therapy for
            vitamin B-12 deficiency associated with Crohn's Disease, Multiple
            Sclerosis and HIV. In December 2003, Questcor and Nastech submitted
            a New Drug Application for the nasal spray formulation of Nascobal.
            The purchase of Nascobal represented Questcor's third product
            acquisition in two years.

      -     Outsource of warehousing and distribution: In June 2003, Questcor
            outsourced certain of the functions previously handled at its
            Carlsbad facility. The decision to outsource these functions and
            close this facility has resulted in reduced expenses in the second
            half of 2003.

      -     Establishment of a wholesale inventory reporting system: In March
            2003, Questcor established a process to gain visibility over the
            inventory levels of certain of its products with the three largest
            drug wholesalers. Establishment of this system allows Questcor to
            monitor inventory levels more accurately than before.

      -     Significant Progress on the Acthar Manufacturing Site Transfer: The
            first commercial lot of HP Acthar Gel from Questcor's new contract
            manufacturer for finished goods, Chesapeake Biological Laboratories
            ("CBL"), was shipped in September 2003. Questcor is now selling HP
            Acthar Gel produced by CBL. Questcor also entered into a
            manufacturing agreement with BioVectra dcl to manufacture the active
            pharmaceutical ingredient used in HP Acthar Gel.

      -     Foreign distribution agreement: In November 2003, Questcor entered
            into an agreement with IDIS Limited, a company located in the United
            Kingdom, to distribute HP Acthar Gel, Nascobal and Ethamolin outside
            the United States on a named-patient basis.

"In 2003, we made significant progress, with three consecutive quarters of
increasing revenues. The acquisition of Nascobal and the various cost
containment measures implemented in the second quarter contributed to the
Company being profitable in the fourth quarter. Demand for Nascobal, as measured
by total prescriptions written and reported by an independent third party
source, were up 7% in the fourth quarter as compared to the third quarter of
2003. We noted specific increases in total prescriptions written by
gastroenterologists, bariatric surgeons and neurologists," stated Charles J.
Casamento, Chairman, President and CEO of Questcor. "Based on the positive
trends we saw in the fourth quarter of 2003, we will begin to focus our sales
efforts in 2004 on the promotion of Nascobal. Using prescription data, we
estimate that there were approximately 37 million injection dosages of vitamin
B-12 prescribed in the United States during the past year. Our promotion efforts
for Nascobal will focus on sub-specialties that are

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treating a subset of these patients. In 2004, we plan that our promotion of
Acthar will be specific to child health neurologists who prescribe Acthar for
Infantile Spasm and those neurologists who have been actively prescribing Acthar
for the treatment of Multiple Sclerosis flares. Our goal for 2004 will be to
increase total revenues and improve EBITDA as compared to 2003."

FINANCIAL RESULTS FOR THE QUARTER ENDED DECEMBER 31, 2003

Total revenues for the quarter ended December 31, 2003 were $4,570,000, an
increase of $1,336,000, or 41%, from $3,234,000 for the quarter ended December
31, 2002. Net product sales for the quarter ended December 31, 2003 were
$4,470,000, an increase of $1,536,000, or 52%, from $2,934,000 for the quarter
ended December 31, 2002. This increase was due primarily to revenues from sales
of Nascobal.

Net income for the quarter ended December 31, 2003 was $324,000 as compared to a
net loss of $355,000 for the quarter ended December 31, 2002, an improvement of
$679,000. Net income applicable to common stockholders was $129,000 for the
quarter ended December 31, 2003, which is determined by deducting from net
income the Series B Preferred Stock dividends of $195,000. Net loss applicable
to common stockholders was the same as net loss for the quarter ended December
31, 2002, as there were no dividends in the fourth quarter of 2002. While
Questcor experienced net income in the quarter ended December 31, 2003, we
expect future quarterly results to fluctuate.

Questcor reported positive EBITDA of $862,000 in the fourth quarter of 2003, as
compared to negative EBITDA of $17,000 in the fourth quarter of 2002.

FINANCIAL RESULTS FOR THE YEAR ENDED DECEMBER 31, 2003

For the year ended December 31, 2003, total revenues were $14,063,000 as
compared to $14,677,000 for the year ended December 31, 2002, a decrease of
$614,000, or 4%. Net product sales for the year ended December 31, 2003 were
$13,655,000, a decrease of $164,000, or 1%, from $13,819,000 for the year ended
December 31, 2002. The decrease in net product sales was due primarily to
decreases in net product sales of Ethamolin and Acthar, offset by sales of
Nascobal, which was introduced in July 2003. Ethamolin net product sales in 2003
decreased by approximately one-half from net product sales in 2002. The decrease
in Ethamolin sales was due primarily to a decrease in the market for sclerosing
agents in general and the advanced buying of Ethamolin in mid-2002, after a
pre-announced price increase. The decrease in Acthar net product sales was
primarily the result of replacement of expired Acthar under our Exchange Policy
during 2003. In addition, during the year ended December 31, 2002, Questcor
shipped backorders outstanding at December 31, 2001 amounting to $334,000 for
Acthar and $408,000 for Ethamolin.

Questcor incurred a net loss of $3,791,000 for the year ended December 31, 2003
as compared to a net loss of $2,785,000 for the year ended December 31, 2002, an
increase of $1,006,000, or 36%. Net loss applicable to common stockholders for
the year ended December 31, 2003 was $5,947,000, or $0.14 per share. In 2003,
Questcor recorded dividends of $2,156,000, comprised of a non-cash dividend
related to the beneficial conversion feature of the Series B Preferred Stock in
the amount of $1,394,000, and cash dividends on the Series B Preferred Stock of
$762,000. As there were no dividends in the year ending December 31, 2002, net
loss applicable

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to common stockholders was the same as the net loss of $2,785,000, or $0.07 per
share, for the year ended December 31, 2002.

OUTLOOK FOR 2004

For the year ended December 31, 2003, Acthar represented approximately 58% of
net product sales, Nascobal represented approximately 15%, and the remaining
products in the portfolio made up the remaining 27%. In 2004, due to a continued
shift in promotional efforts toward Nascobal and the return of supply of
Solu-Medrol, the primary competitive product to Acthar, we expect prescriptions
for Acthar to drop below 2003 levels. In 2004, Acthar promotional efforts will
be designed to support current prescribers of Acthar in neurology. Based on the
positive prescription trends of Nascobal in Q4 of 2003, Questcor will add
promotional resources to this growth product. As such, we expect revenue from
Nascobal to increase in 2004 and become a larger percentage of our total sales.
Pending the impact of any unforeseen events, operating expenses are expected to
remain relatively stable in 2004 as compared to 2003. However, Questcor
anticipates that its operating results will fluctuate quarter to quarter.

YEAR ENDED DECEMBER 31, 2003 CONFERENCE CALL

Questcor will be hosting a conference call to discuss these results on
Wednesday, March 3, 2004 at 11:00 a.m. Eastern Time (8:00 a.m. Pacific Time).
Please call the following numbers to participate: (800) 741-6056 (domestic) or
(706) 679-3280 (international) and use conference ID number 5608244.
Participants are asked to call the above numbers 5-10 minutes prior to the
starting time.

This call is being webcast by CCBN and can be accessed at Questcor's website at
www.questcor.com. The webcast is also being distributed over CCBN's Investor
Distribution Network to both institutional and individual investors. Individual
investors can listen to the call through CCBN's individual investor center at
www.companyboardroom.com or by visiting any of the investor sites in CCBN's
Individual Investor Network. Institutional investors can access the call via
CCBN's password-protected event management site, StreetEvents
(www.streetevents.com).

A telephonic replay of this call will be available from 2:00 p.m. Eastern Time
on Wednesday, March 3, 2004 through 11:59 p.m. Eastern Time on Wednesday,
March 10, 2004. Please call (800) 642-1687 (domestic) or (706) 645-9291
(international) and use conference ID number 5608244.

About Questcor

Questcor Pharmaceuticals, Inc. is a specialty pharmaceutical company that
acquires, develops, markets and sells brand name prescription drugs through a
U.S. direct sales force and international commercialization partners. Questcor
currently markets five products in the U.S.: HP Acthar(R) Gel, an injectable
drug that is commonly used in treating patients with infantile spasm and is
approved for the treatment of certain central nervous system disorders with an
inflammatory component including the treatment of flares associated with
Multiple Sclerosis; Nascobal(R), the only prescription nasal gel formulation of
Cyanocobalamin USP (Vitamin B-12), that is approved for patients with severe
deficiencies of Vitamin B-12 caused by MS and Crohn's Disease; Ethamolin(R), an
injectable drug used to treat enlarged weakened blood vessels at the entrance to
the stomach that have recently bled, known as esophageal varices; Glofil(R)-125,
which is an injectable agent that assesses how well the kidney is working by
measuring

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glomerular filtration rate, or kidney function; and VSL#3(TM), a patented
probiotic marketed as a dietary supplement, to promote normal gastrointestinal
(GI) function. As part of a strategy to commercialize its products, Questcor has
entered into several contractual relationships with public and private companies
including: Ahn-Gook Pharmaceuticals of Korea; Aventis Pharmaceuticals Inc. of
Bridgewater, NJ; Beacon Pharmaceuticals, Ltd. of Tunbridge Wells, Kent, United
Kingdom; Dainippon Pharmaceutical Co. Ltd., of Osaka, Japan; Nastech
Pharmaceutical Company Inc. of Bothell, WA; Orphan Australia of Melbourne,
Australia and VSL Pharmaceuticals of Ft. Lauderdale, FL.

Note: Except for the historical information contained herein, this press release
contains forward-looking statements that involve risks and uncertainties. Such
statements are subject to certain factors, which may cause Questcor's results to
differ from those reported herein. Factors that may cause such differences
include, but are not limited to, Questcor's ability to accurately forecast the
demand for each of their products, the gross margins achieved from the sale of
those products, the accuracy of the prescription data purchased from independent
third parties by Questcor, the sell through by Questcor's distributors, the
inventories carried by Questcor's distributors, and the expenses and other cash
needs for the upcoming periods, Questcor's ability to obtain finished goods from
its sole source contract manufacturers on a timely basis if at all, Questcor's
need for additional funding, uncertainties regarding Questcor's intellectual
property and other research, development, marketing and regulatory risks, and,
to the ability of Questcor to implement its strategy and acquire products and,
if acquired, to market them successfully as well as the risks discussed in
Questcor's report on Form 10-K for the calendar year ended December 31, 2002 and
other documents filed with the Securities and Exchange Commission. The risk
factors and other information contained in these documents should be considered
in evaluating Questcor's prospects and future financial performance.

The Company undertakes no obligation to publicly release the result of any
revisions to these forward-looking statements, which may be made to reflect
events or circumstances after the date hereof or to reflect the occurrence of
unanticipated events.

Table to follow on next page.

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                         Questcor Pharmaceuticals, Inc.
                 Selected Consolidated Balance Sheet Information
                                 (In thousands)



                                                               DECEMBER 31,    DECEMBER 31,
                                                                   2003          2002 (1)
                                                               (UNAUDITED)
                                                               ------------    ------------
                                                                         
Cash, cash equivalents and short-term investments              $      3,220    $      7,506
Working capital                                                       4,352           7,018
Total assets                                                         22,929          12,766
Long-term debt (including $4 million face value convertible
  debentures, net of deemed discount)                                 3,402           2,908
Preferred stock, Series A                                             5,081           5,081
Stockholders' equity                                                 10,578             496


(1) Derived from audited financial statements

                         Questcor Pharmaceuticals, Inc.
                 Condensed Consolidated Statements of Operations
                    (In thousands, except per share amounts)



                                                            THREE MONTHS ENDED                YEAR ENDED
                                                               DECEMBER 31,                  DECEMBER 31,
                                                           2003           2002           2003           2002
                                                        -----------    -----------    -----------    -----------
                                                        (UNAUDITED)    (UNAUDITED)    (UNAUDITED)     (AUDITED)
                                                                                         
Revenues:
   Net product sales                                    $     4,470    $     2,934    $    13,655    $    13,819
   Contract research, grant and royalty revenue                  --             50             58            208
   Technology revenue                                           100            200            350            450
   Services revenue from a related party                         --             50             --            200
                                                        -----------    -----------    -----------    -----------
      Total revenues                                          4,570          3,234         14,063         14,677
                                                        -----------    -----------    -----------    -----------
Operating costs and expenses:
   Cost of product sales                                        953            651          3,573          2,822
   Selling, general and administrative                        2,450          2,087         10,400         10,825
   Research and development                                     355            603          2,267          2,295
   Depreciation and amortization                                335            217          1,157          1,138
                                                        -----------    -----------    -----------    -----------
      Total operating costs and expenses                      4,093          3,558         17,397         17,080
                                                        -----------    -----------    -----------    -----------
Income (loss) from operations                                   477           (324)        (3,334)        (2,403)
Non-cash amortization of deemed discount
   on convertible debentures                                   (131)          (110)          (522)          (415)
Interest income (expense), net                                  (72)           (11)          (104)            (8)
Other income (expense), net                                     (16)            20            (91)          (241)
Rental income, net                                               66             70            260            282
                                                        -----------    -----------    -----------    -----------
Net income (loss)                                               324           (355)        (3,791)        (2,785)
Non-cash deemed dividend related to
   beneficial conversion feature of  Series B
   Preferred Stock                                               --             --          1,394             --
Dividends on Series B Preferred Stock                           195             --            762             --
                                                        -----------    -----------    -----------    -----------
Net income (loss) applicable to common stockholders     $       129    $      (355)   $    (5,947)   $    (2,785)
                                                        ===========    ===========    ===========    ===========

Basic and diluted net income (loss) per common share
   applicable to common stockholders                    $      0.00    $     (0.01)   $     (0.14)   $     (0.07)
                                                        ===========    ===========    ===========    ===========

Weighted average shares of common stock
   outstanding - basic and diluted                           44,546         38,673         41,884         38,407
                                                        ===========    ===========    ===========    ===========


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In addition to disclosing financial results prepared in accordance with
accounting principles generally accepted in the United States, or U.S. GAAP,
Questcor is disclosing information regarding EBITDA, which is defined as
earnings before net interest income (expense), taxes, depreciation and
amortization, and non-cash amortization of deemed discount on convertible
debentures. As required by the SEC concerning the use of non-GAAP measures,
Questcor is providing the following reconciliation to net income (loss), which
is the most directly comparable GAAP measure. Questcor presents EBITDA as it is
a common alternative measure of performance that is used by management as well
as investors when analyzing the financial position and operating performance of
the Company. As EBITDA is a non-GAAP financial measure, it should not be
considered in isolation or as a substitute for net income (loss) or any other
GAAP measure. Because all companies do not calculate EBITDA in the same manner,
Questcor's definition of EBITDA may not be consistent with that of other
companies.

                         Questcor Pharmaceuticals, Inc.
           Reconciliation of GAAP Net Income (Loss) to Non-GAAP EBITDA
                                 (In thousands)
                                   (unaudited)



                                                    THREE MONTHS ENDED
                                        -------------------------------------------
                                        DECEMBER 31,   SEPTEMBER 30,   DECEMBER 31,
                                            2002           2003            2003
                                        ------------   -------------   ------------
                                                              
GAAP net income (loss)                  $       (355)  $        (576)  $        324
Adjustments:
  Net interest expense                            11              18             72
  Depreciation and amortization                  217             441            335
  Non-cash amortization of deemed
    discount on convertible debentures           110             130            131
                                        ------------   -------------   ------------
Non-GAAP EBITDA  -
    Positive (Negative)                 $        (17)  $          13   $        862
                                        ============   =============   ============


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