Natalizumab
pharmaceutical drug
Natalizumab, sold under the brand name Tysabri among others, is a medication used to treat multiple sclerosis and Crohn's disease. It is a humanized monoclonal antibody against the cell adhesion molecule α4-integrin. It is given by intravenous infusion. The drug is believed to work by reducing the ability of inflammatory immune cells to attach to and pass through the cell layers lining the intestines and blood–brain barrier.
Natalizumab is a monoclonal antibody which targets a protein called α4β1 integrin on white blood cells involved in inflammation. By attaching to integrin, natalizumab is thought to stop white blood cells from entering the brain and spinal cord tissue, thereby reducing inflammation and the resulting nerve damage.
The most common side effects are urinary tract infection, nasopharyngitis (inflammation of the nose and throat), headache, dizziness, nausea, joint pain and tiredness.
Natalizumab was approved for medical use in the United States in 2004. It was subsequently withdrawn from the market by its manufacturer after it was linked with three cases of the rare neurological condition progressive multifocal leukoencephalopathy (PML) when administered in combination with interferon beta-1a, another immunosuppressive drug often used in the treatment of multiple sclerosis. After a review of safety information and no further deaths, the drug was returned to the US market in 2006 under a special prescription program.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Jun 30, 2026. The linked authority identifier is Q386119. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2004 and 2006.
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This entry incorporates text from “Natalizumab” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.