There is no evidence that antibodies in MS act against Botox; however, as MS is characterized by muscle issues it is best to get clearance from your neurologist before having any cosmetic procedures.
Although MS is an autoimmune disease the problem is activity against the lining of the nerves. there is no evidence that there are antibodies against Botox but MS patients do have muscle issues and this must be addressed if Botox is being considered. it is probably best not to attempt it