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Tysabri (natalizumab) is a disease modifying treatment (DMT) for highly active relapsing remitting multiple sclerosis. Tysabri is given as an intravenous infusion (drip), usually once every four weeks and trials have shown that it reduces the number of relapses experienced by around 70%.Find out how other MSers have managed their condition using Tysabri MS treatment and ask any questions you might have.