Oral Corticotherapy in Megadoses to Treat Multiple Sclerosis During Relapse

This is a multicenter, randomized, double blind clinical trial to test whether oral methylprednisolone (MP) is not inferior to intravenous methylprednisolone for the treatment of multiple sclerosis (MS) relapse in terms of clinical and radiological efficacy. Patients will be randomly assigned to one of the following two groups. Group A: methylprednisolone 1.000 mg/day intravenous administered during three days + placebo of methylprednisolone orally administered Group B: methylprednisolone 1.250 mg/day orally administered during three days + placebo of methylprednisolone intravenously administered. Clinical visits will be conducted at 7, 28 and 90 days after treatment starting.