My doctor mentioned this medication to me on Friday when I was in for my infusion. I'm in a relapse and so I suppose he wanted me to know this one might be an option in the near future if I want to switch to something a bit stronger. I'm assuming since it targets both T cells and B cells that it's stronger than Tysabri. He also said it isn't associated with PML but there have been some cases of cancer though they can't all be positively blamed on the Cladribine.
Take care, Ewizabeth Previously Avonex, Rebif & Copaxone RRMS ~Tysabri, 31 infusions, ended 9/09. Starting Copaxone 12/09, waiting for Cladribine to be approved in 2010.