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At the end of July 2008, the European Medicines Agency (EMEA) received two reports of progressive multifocal leukoencephalopathy (PML) in patients with relapsing-remitting multiple sclerosis (MS) who have been treated with Tysabri.

PML is a rare brain infection with symptoms that are similar to those of an MS attack. The two cases occurred in patients who have been treated for MS with Tysabri only for more than 12 months. The two cases were reported as part of the continuous safety-monitoring of medicines following their authorisation and placing on the market.

The risk of PML with Tysabri is known and is kept under close monitoring by the EMEA. The product information advises healthcare professionals that the medicine must not be used in patients who have PML and that patients taking Tysabri should be regularly monitored for signs and symptoms suggestive of PML.

The two cases are currently being assessed by the EMEA's scientific Committee for Medicinal Products for Human Use (CHMP). Elan, the marketing authorisation holder for Tysabri, has also been asked to provide any additional information they may have. Following assessment of all available data, the CHMP will determine whether any changes to the currently approved product information or the existing risk minimisation measures, including the 'Physician Information and Management Guidelines for Multiple Sclerosis Patients on Tysabri' are necessary......................................

For the full report please go to MSRC: MS Research News : Drugs : Disease Modifying Drugs : Disease Modifying Drugs Ongoing News : TYSABRI®