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Tysabri News
When Insurers Restrict MS Drug Coverage, Relapses Rise
TUESDAY, Aug. 5, 2025 — Multiple sclerosis (MS) patients might have a higher risk of relapse if their health insurance is stingy with prescriptions, a new study reports. Patients with insurance plans ...
Adverse Outcomes Seen With MS Disease-Modifying Drugs in Pregnancy
THURSDAY, Jan. 2, 2025 – Disease-modifying therapy (DMT) use for multiple sclerosis (MS) in pregnancy is associated with certain adverse outcomes, including small for gestational age, according to a...
FDA Approves Tyruko (natalizumab-sztn), a Biosimilar to Tysabri
August 24, 2023 – The U.S. Food and Drug Administration today approved Tyruko (natalizumab-sztn), the first biosimilar to Tysabri (natalizumab) injection for the treatment of adults with relapsing...
FDA Medwatch Alert: Tysabri (natalizumab): Drug Safety Communication - New Risk Factor for Progressive Multifocal Leukoencephalopathy (PML)
ISSUE: FDA notified healthcare profesisonals that testing positive for anti-JC virus (JCV) antibodies has been identified as a risk factor for progressive multifocal leukoencephalopathy (PML). PML is...
FDA Medwatch Alert: Tysabri (natalizumab): Update of Healthcare Professional Information
[UPDATED Posted 04/22/2011] FDA has updated the Tysabri (natalizumab) Prescribing Information to give new information about the size of the risk of progressive multifocal leukoencephalopathy (PML), a...
FDA Medwatch Alert: Tysabri (natalizumab) - Aug 25, 2008
[Posted 08/25/2008] FDA informed healthcare professionals of two new cases of progressive multifocal leukoencephalopathy (PML) in European patients receiving Tysabri monotherapy for multiple...
FDA Medwatch Alert: Tysabri (natalizumab - Feb 27, 2008
[Posted 02/27/2008] Biogen Idec, Elan and FDA notified healthcare professionals of reports of clinically significant liver injury, including markedly elevated serum hepatic enzymes and elevated total...
FDA Medwatch Alert: Tysabri (natalizumab) - Jun 5, 2006
[UPDATE 07/21/2006] Dear Healthcare Provider Letter issued. [Posted 06/05/2006] FDA notified healthcare professionals of the resumed marketing, with a special restricted distribution program of...
FDA Medwatch Alert: Tysabri (natalizumab) - Feb 2, 2005
[02/28/2005] FDA issued a public health advisory to inform patients and health care providers about the suspended marketing of Tysabri (natalizumab) due to two serious adverse events reported with...
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