- Use of any time prior to study any drug for modifying multiple sclerosis: interferon beta-1a, interferon beta-1b, glatiramer acetate, azathioprine, corticosteroids and immunomodulators (except for treating exacerbations corticosteroids), drugs and monoclonal antibodies, cytotoxic and / or immunosuppressive drugs, including, but not limited to drugs: mitoxantrone, cyclophosphamide, cyclosporine, fingolimod, cladribine; or total lymphoid irradiation system;