Last updated on June 2019

Tysabri Observational Program


Are you eligible to participate in this study?

You may be eligible for this study if you meet the following criteria:

  • Conditions: relapsing-remitting multiple sclerosis
  • Age: Between 18 - 65 Years
  • Gender: Male or Female

Key Inclusion Criteria:

  • Documented diagnosis of Relapsing Remitting Multiple Sclerosis
  • The decision to treat with Tysabri must precede enrollment
  • Patient must be a new Tysabri user, and must not have had more than 3 Tysabri infusions prior to enrollment
  • Must have had at least one relapse in the previous year, and must satisfy locally approved therapeutic indications for Tysabri

Key Exclusion Criteria:

  • History of Progressive Multifocal Leukoencephalopathy or other opportunistic infections, or an increased risk of opportunistic infections
  • History of positive anti-natalizumab antibodies
  • Concomitant Immunomodulatory or immunosuppressive therapy during therapy with Tysabri
  • Patient immunocompromised at the time of enrollment
  • Known active malignancy
  • Women must not be breast feeding or pregnant, or planning to become pregnant (must use birth control unless surgically sterile)

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.

Recruitment Status: Open


Brief Description Eligibility Contact Research Team


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