The most common side effects reported in the study were: were dizziness (seen in 10.4% of those on Ampyra, 2.5% of those on placebo), nausea (3.9% Ampyra, 6.2% placebo), fatigue (5.2% Ampyra, 3.7% placebo), insomnia (5.2% dalfampridine-ER, 2.5% placebo) and arthralgia (2.6% Ampyra, 3.7% placebo).

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