For patients suffering from the relapsing-remitting form of MS, Tysabri is an effective treatment. But most doctors are recommending it be used only to treat cases of rapidly-evolving and severe relapsing–remitting multiple sclerosis or (RES). This is because of side effect possibilities of Multiple Sclerosis Tysabri treatment, which are not insignificant. RES is characterized by experiencing two or more relapses in a year period, and one or more gadolinium-enhancing lesions as seen on an MRI of the brain. Usually, the initial disease modifying therapy for relapsing-remitting multiple Sclerosis will be an interferon beta-1a, interferon beta-1b or Glatiramer Acetate based treatment.
MS Tysabri treatment is actually a natalizumab treatment. Tysabri is the brand name of the drug.

Multiple Sclerosis Tysabri treatment approved after two trials showed evidence of effectiveness for RMMS patients

The original FDA approval of MS Tysabri infusion to treat relapsing forms of MS was based conclusions …