Among the drugs used for MS, few like IFN-beta, Natalizumab, Glatiramer acetate don't cross BBB while Fingolimod do. So a humble request to the experts for their comments.
In view of the venous changes given in MS only, it would be required for a drug to be effective in multiple sclerosis to prevent the retrograde damaging of particular branches of the internal cerebral veins - something obviously not being required in ADEM/EAE