I do. According to the 2009 LDN conference, beta interferon and LDN work in a similar way. I'm not a scientist, but I have been on both drug treatments both individually and together. If you want to try both together then it is quite safe to do so.
My Bladder works properly when on LDN. Without, I suffer from urinary urgency.
On LDN alone, I felt good, but had a very serious relapse. I was quite angry about this, but I ignore hype now and 'warnings' about the two drugs together. Those making the warnings are not qualified to be taken seriously. No clinical trials exist.
Give LDN a try. It may help. I have grown accustomed to being continent.