Treatment to Reduce Number of Attacks Immunomodulatory therapy. Both glatiramer acetate (GA) and interferon beta (IFNB) are immunomodulators, and decrease the relapse rate and MRI accrual of new lesions in adults with MS (IFNB Multiple Sclerosis Study Group 1993; Jacobs et al., 1996; PRISMS 2000; Comi, Filippi, &   more »