Methods of treating or ameliorating multiple sclerosis by the dihydroorotate dehydrogenase (DHODH) inhibitor vidofludimus or a pharmaceutically acceptable salt and/or a solvate, in particular a hydrate, thereof or a solvate, in particular a hydrate, of a pharmaceutically acceptable salt thereof, by administering to a human patient a therapeutically effective amount of the DHODH inhibitor, more specifically a daily dose of about 10 mg to about 45 mg.