What is the maximum duration of therapy with Tysabri for multiple sclerosis?

The correct response regarding the maximum duration of therapy with Tysabri (natalizumab) for multiple sclerosis is that it can be administered for an indefinite period. Tysabri is a monoclonal antibody used to treat relapsing forms of multiple sclerosis. Patients may remain on this treatment as long as they are responding well and not experiencing significant adverse effects.

The option indicating a maximum of 2 years does not accurately reflect clinical guidelines or research, as long-term therapy has been shown to be effective and necessary for many patients in managing their condition. Regular monitoring for potential side effects, such as the risk of progressive multifocal leukoencephalopathy (PML), is essential, which allows for ongoing therapy as long as it remains safe and beneficial for the patient.