4-AP (Fampridine-SR) passes FDA heart test

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Acorda Therapeutics (nasdaq: ACOR - news - people ) said its multiple sclerosis drug Fampridine-SR does not raise the risk of heart-related side effects anymore than a placebo in a so-called QT cardiac safety study required by the U.S. Food and Drug Administration. Acorda shares were up 20.1%, or $4.38, at $26.16, in afternoon trading.