Data from two long-term open-label extension studies of Fampridine-SR show that 86.0% of participants remained on therapy after a maximum treatment time of 15 months in study MS-F204EXT, and 69.5% remained on therapy after a maximum treatment time of 36 months in study MS-F203EXT. The average treatment time for all patients was 10 months in the MS-F204EXT study and 26 months in the MS-F203EXT study, both inclusive of dropouts.