Questcor Pharmaceuticals, Inc. Finally Fesses Up To Adverse Events Data For Acthar

For years, Questcor Pharmaceuticals has highlighted the potential benefits of Acthar, its immune-system drug, while saying little about its ill effects.

But according to a regulatory filing made by Questcor early Thursday, the number of patients reporting a so-called adverse event while using the drug last year represented almost 5 percent of prescriptions dispensed. The total number of events in 2013 reported by patients, who can experience multiple ill effects, was almost 14 percent of prescriptions, up from 9.1 percent in 2011.

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