Date:5/20/2011

.  Of these 19 indications, Questcor currently generates substantially all of its net sales from three indications: the treatment of acute exacerbations of multiple sclerosis in adults, the treatment of nephrotic syndrome, and the treatment of infantile spasms in children under two years of age. With respect to nephrotic syndrome, the FDA has approved Acthar to "induce a diuresis or a remission of proteinuria in the nephrotic syndrome without uremia of the idiopathic type or that due to lupus erythematosus."  Questcor is also exploring the possibility of developing markets for other on-label indications and the possibility of pursuing FDA approval of additional indications not currently on the Acthar label where there is high unmet medical need.  Questcor also markets Doral(R) (quazepam), which is indicated for the treatment of insomnia characterized by difficulty in falling asleep, frequent nocturnal awakenings, and/or early morning awakenings. For more information, please visit www.questcor.com.

Note: Except for the historical information contained herein, this press release contains forward-looking statements that have been made pursuant to the Private Securities Litigation Reform Act of 1995. These statements relate to future events or our future financial performance. These statements are only predictions. Actual events or results may differ materially. Factors that could cause or contribute to such differences include, but are not limited to, the following:

• Our reliance on Acthar for substantially all of our net sales and profits;
• Our ability to generate revenue from sales of Acthar to treat on-label indications associated with NS, and our ability to develop other therapeutic uses for Acthar;
• Our ability to effectively manage our growth and our reliance on key personnel;
• Volatility in Questcor's monthly and quarterly Acthar shipments
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SOURCE Questcor Pharmaceuticals, Inc. Copyright©2010 PR Newswire. All rights reserved

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