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Questcor Falls as Citron Research Questions MS Drug

Questcor Pharmaceuticals Inc. declined for a second straight day after a research report said that the company’s multiple sclerosis treatment didn’t contain any of its active ingredient.

The shares of the Anaheim, California-based company fell 10 percent to close at $60.75 in New York, the biggest single-day loss in about four months. Yesterday, shares tumbled 9.1 percent.