Hi Susanna! The last I heard about Cladribine was that it was in the production/testing phase (in 2013). My understanding was that it was pulled because test subjects developed cancer while on the medication. I will have to see if the information has changed, but here is what we have on Cladribine -- https://multiplesclerosis.net/research/mylinax-cladribine/. As with any medication, it is always best to weigh the pros and cons for yourself and your life. I know you already know that, but with medications that come with such potentially strong side effects, it's good to remember. I hope this information is helpful for you! Thanks so much for your question and for being a part of the MultipleSclerosis.net community. Best, Erin, MultipleSclerosis.net Team Member.