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Shares of Anaheim-based Questcor Pharmaceuticals Inc. soared today after it reported that third-quarter profits nearly doubled from a year earlier on the strength of more prescriptions for its sole drug.

Questcor makes Acthar, an injectable drug used to treat multiple sclerosis flare-ups as well as a rare form of epilepsy and a kidney disorder.

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The drug maker’s third-quarter profit grew 96% to $22.9 million compared to the same quarter a year ago.

Analysts on average expected $16.5 million.

Questcor’s quarterly revenue shot up 93% to $56.1 million, surpassing Wall Street projections of $53.2 million.

Investors sent Questcor’s shares up about 13% in afterhours trading today, to a market value of nearly $2.1 billion.

Questcor said that the number of paid prescriptions for Acthar as a multiple sclerosis treatment grew 174%, from 323 to 886. It added that use of the drug for infantile spasm epilepsy and nephrotic syndrome, a kidney disease, had increased.