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How long does it take Ocrevus to work?

Medically reviewed by Carmen Pope, BPharm. Last updated on March 10, 2025.

Official Answer by Drugs.com

Ocrevus has some effect at reducing disability progression within about 12 weeks; however, it may take at least 6 months or possibly longer for the full effects to be seen. Trials of up to 96 weeks (almost 2 years) duration have shown that:

References
  • Ocrevus (ocrelizumab) 05/2020 Genentech, Inc. https://www.drugs.com/pro/ocrevus.html
  • Ocrevus. National Multiple Sclerosis Society. 2020 https://www.nationalmssociety.org/Treating-MS/Medications/Ocrevus#:~:text=Ocrevus%20is%20approved%20by%20the,primary%20progressive%20MS%20in%20adults.
  • Hauser SL, Bar-Or A, Comi G, et al. Ocrelizumab versus Interferon Beta-1a
    in Relapsing Multiple Sclerosis. N Engl J Med 2017;376:221-34.
    DOI: 10.1056/NEJMoa1601277

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