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Can the side effects of Ocrelizumab worsen MS symptoms?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hello doctor,

I am a 45-year-old patient with multiple sclerosis, and I have been on Ocrelizumab (Ocrevus) for about a year now. While the medication seems to have slowed my disease progression, I have noticed increased fatigue, occasional muscle stiffness, and some mild upper respiratory infections. Are these side effects of Ocrelizumab, or could they be related to my MS itself?

I have also heard that being on this medication might affect my immune system.

  1. Should I be concerned about infections or vaccinations?
  2. Additionally, how do I know if Ocrelizumab is effectively working for me?
  3. Should I consider any specific tests or monitoring?
  4. Finally, are there any new therapies or lifestyle changes I should discuss with my doctor to complement this treatment?

Please help.

Answered by Dr. Prabhakaran

Hello,

Welcome to icliniq.com.

I understand your concern.

Side effects of Ocrelizumab versus MS symptoms:

Fatigue and stiffness are common MS symptoms and can be exacerbated by the disease itself or by other factors like stress, overexertion, or lack of sleep. These could also be indirectly related to Ocrelizumab, as it modulates the immune system and might cause general tiredness.

Ocrelizumab suppresses parts of your immune system (specifically B-cells), which can make you more susceptible to infections like colds and sinus issues. This is a recognized side effect.

One helpful way to tell whether symptoms are more likely from the medication or MS itself is to observe patterns. If fatigue or stiffness tends to worsen around infusion times or follows a predictable cycle, it may be medication-related. Regular neurological follow-ups and MRI monitoring help your doctor determine whether symptoms are due to disease activity or treatment effects.

Ocrelizumab lowers the activity of B-cells, reducing the immune system’s ability to fight infections. You are at a higher risk for respiratory infections (colds, bronchitis) and reactivation of latent infections (for example: hepatitis B, if present). To mitigate this, stay updated on vaccinations (see below) and practice good hygiene. Live vaccines are not recommended while on Ocrelizumab due to immune suppression. Non-live vaccines (for example: flu shot, COVID-19 (coronavirus) vaccine, pneumococcal vaccine) are safe and strongly recommended.

Discuss vaccine timing with your doctor, as certain vaccines should be administered before starting a new infusion.

Ocrelizumab works by reducing relapses, slowing disease progression, and limiting new lesions in the brain and spinal cord. Here is how you and your doctor can monitor its effectiveness:

  1. Regular MRIs (every six to 12 months) can check for new or active lesions.

  2. Keep a journal of symptoms and flare-ups to identify trends over time.

  3. Routine neurological examinations assess physical and cognitive changes.

  4. A decrease in relapses is a good indicator that the medication is working.

If you notice a significant worsening of symptoms or new relapses, inform your doctor. They may adjust your treatment plan or investigate other causes.

Alongside medication, lifestyle measures can make a meaningful difference.

  1. Anti-inflammatory diets (for example, Mediterranean or Wahls protocol) may support overall health. Ensure sufficient vitamin D levels, as low vitamin D can worsen MS.

  2. Moderate, regular exercise improves fatigue, mobility, and mood. Work with a physical therapist if needed.

  3. Stress can worsen MS symptoms. Practices like mindfulness, yoga, or meditation can help.

  4. Physical therapy helps to manage stiffness, improve mobility, and maintain strength. Occupational therapy can assist with adapting your environment or routines to conserve energy.

  5. Cognitive rehabilitation is useful if cognitive changes are present.

MS research is advancing, and while Ocrelizumab is a highly effective therapy, staying informed about new treatments is beneficial. Some ongoing developments include:

  1. BTK (Bruton Tyrosine Kinase) inhibitors are being studied as experimental treatments that target different parts of the immune system to further reduce inflammation in multiple sclerosis.

  2. Stem cell therapy shows promise in managing MS but is still in the experimental stage and not yet part of standard treatment.

  3. Lifestyle approaches and digital tools, such as mobile apps, can help track MS symptoms over time and offer personalized recommendations to support disease management.

Discuss these with your doctor to see if any emerging therapies align with your needs.

Fatigue is one of the most common and challenging MS symptoms. Some tips:

  1. Prioritize tasks and rest between activities.

  2. Medications like Amantadine or Modafinil may help manage fatigue.

  3. Ensure quality sleep by maintaining a consistent schedule and addressing sleep disorders, if present.

Please contact your neurologist if you experience a marked worsening of symptoms, new neurological issues, signs of infection such as fever, or if fatigue and stiffness begin to interfere significantly with your daily life.

I hope this has helped you.

Please feel free to reach me again, in case of further queries.

Thank you.

Answered byDr. Prabhakaran

Medically reviewed byiCliniq medical review team

Published At December 26, 2024
Reviewed AtDecember 22, 2025

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