Ok, I had this issue where Biogen wasn't paying for my Tecfidera anymore and I had to pay it myself. I told my doctor and we switched from Biogen and went to Carelon mail-in pharmacy, who sends me the generic Tecfidera called Dimethyl Fumarate and asked for assistance on that. I now pay $15 a month and you don't get pressed on it if you can't pay then and there. Your bill just ads up by $15 or whatever they charge you. Hope this helps.