A real world multi center study on efficacy and safety of natalizumab in Indian patients with multiple sclerosis.

Background: Natalizumab (NTZ) is increasingly being used in Indian multiple sclerosis (MS) patients. There are no reports on its safety and efficacy, especially with respect to the occurrence of progressive multifocal leukoencephalopathy (PML).

Objectives: To describe the patient characteristics, treatment outcomes, and adverse events, especially the occurrence of PML in NTZ-treated patients.