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Is Natalizumab effective for multiple sclerosis in men?

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

Patient's Query

Hi doctor,

I’m a 47-year-old male and have been living with multiple sclerosis for several years. My neurologist recently recommended starting Tysabri as part of my treatment plan.

  1. I’d like to understand more about this medication and how effective it is in managing MS.

  2. I’m also concerned about any potential long-term side effects. Are there safer or more effective alternatives I should be aware of?

I’d really appreciate your guidance in making an informed decision about my treatment.

Thank you.

Hi,

Welcome to icliniq.com.

I’ve reviewed your concerns and appreciate you reaching out for more information.

  1. Tysabri (Natalizumab) is a monoclonal antibody that has shown strong effectiveness in reducing relapses and slowing disease progression in people with relapsing forms of multiple sclerosis (MS). It works by targeting immune cells and preventing them from crossing into the brain and spinal cord, which helps reduce inflammation and nerve damage.

  2. That said, while Tysabri can be very effective, it’s important to be aware of its potential risks. One of the most serious, though rare, side effects is progressive multifocal leukoencephalopathy (PML), which is a potentially life-threatening brain infection. Your doctor will typically screen you for the JC virus (the virus associated with PML) before starting treatment and monitor you regularly throughout.

  3. Tysabri is generally not recommended if you have significant liver disease, kidney issues, or a history of certain infections. It’s critical to use this medication under close medical supervision with regular follow-ups and imaging if needed.

  4. If you’re unsure about starting Tysabri, there are other disease-modifying therapies (DMTs) available for MS, including injectables, oral medications, and other biologics. Your neurologist can help tailor the best option based on your disease activity, lifestyle, and individual risk factors.

  5. Please don’t hesitate to reach out with more questions or to discuss this further with your MS specialist.

Please don’t hesitate to reach out if you have any follow-up questions. I’m here to help.

Thank you.

Medically reviewed byiCliniq medical review team

Published At March 1, 2024
Reviewed AtJune 17, 2025

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