Sorry I can't answer any of your questions. I am in the process of waiting back from the Fing. study about my MRIs and records and see if I qualify to have testing..then I'll have 2 more months till the Betaseron completely leaves my system and I can take the pill. So the only thing I can say.. is you'll need a 3 month window (at least in my case) to have the current DMD meds out of your system before they'll give you the oral stuff. I guess so it doesn't skew the results. I wish you the best of luck!!