Questcor Included in Russell 3000 Index

Annual Reconstitution June 27, 2008


UNION CITY, Calif., June 30, 2008 (PRIME NEWSWIRE) -- Questcor Pharmaceuticals, Inc. (Nasdaq:QCOR) announced today that it has been notified that it has been included in the broad-market Russell 3000(r) Index effective June 27, 2008. A preliminary list of additions can be viewed at www.russell.com.

"Inclusion in the Russell 3000 Index expands Questcor's awareness among investors and broadens our base of shareholders," said Don Bailey, President and Chief Executive Officer of Questcor Pharmaceuticals.

About Russell Indexes

Annual reconstitution of Russell's U.S. indexes captures the 4,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization. Membership in the Russell 3000, which remains in place for one year, means automatic inclusion in the large-cap Russell 1000(r) Index or small-cap Russell 2000(r) Index as well as the appropriate growth and value style indexes. Russell determines membership for its equity indexes primarily by objective, market-capitalization rankings and style attributes. The Russell 3000 also serves as the U.S. component to the Russell Global Index, which Russell launched last year.

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. An industry-leading $4.4 trillion in assets currently are benchmarked to them. These investment tools originated from Russell's multi-manager investment business in the early 1980s when the company saw the need for a more objective, market-driven set of benchmarks in order to evaluate outside investment managers.

About Questcor

Questcor Pharmaceuticals, Inc. is a pharmaceutical company that owns two commercial products, H.P. Acthar(r) Gel ("Acthar") and Doral(r), and is developing new medications using strategies that generally require lower capital investment when compared to traditional development programs. Acthar (repository corticotropin injection) is an injectable drug that is approved for the treatment of certain disorders with an inflammatory component, including the treatment of exacerbations associated with multiple sclerosis ("MS"). In addition, Acthar is not indicated for, but is used in treating patients with infantile spasms ("IS"), a rare form of refractory childhood epilepsy, and opsoclonus myoclonus syndrome, a rare autoimmune-related childhood neurological disorder. Doral is indicated for the treatment of insomnia characterized by difficulty in falling asleep, frequent nocturnal awakenings, and/or early morning awakenings. The Company is also developing new medications, including QSC-001, a unique orally disintegrating tablet formulation of hydrocodone bitartrate and acetaminophen for the treatment of moderate to moderately severe pain. For more information, please visit www.questcor.com.



            

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