The study, based on feedback gathered in an on-line survey completed by 100 neurologists in March 2010, found that among the disease modifying agents available, Biogen Idec’s Tysabri had the highest percent of neurologists indicating a recent increase in use. However, fear of PML is noted as a leading obstacle to expanded use of the product by 80% of the respondents. Furthermore, patients on Tysabri are significantly more likely to be given a drug holiday compared to other brands and this is usually at the direction of the neurologist as opposed to patient request.
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