I have no idea - think the standard is to have an MRI once a year on G - (it is every six months with Tysabri).

However, now that there has been a couple of cases of PML in Gilenya patients who have never been on Tysabri, alarm bells might be ringing that it needs to be monitored more closely.

Kinda hope it changes to six monthly, because since I was told I have to change, I don't want to be caught out.