Brother in-law

Purple35
Hi guys my brother in law was diagnosed with ms at the age of 21.  Sadly he has declined do to a lot of stress in his marriage. The marriage ended about 5 years ago and he is slowly on the mend but is now in wheel chair, mobile stairs and my husband is in the process of building him a walk in shower.  I haven't read up on Ms but I'm learning a lot by just observing him.  His name is Brian, he is a sweet heart and would do anything for anyone.  I joined the group because his conditioned is stable and his neurologist is so upset with him because he has stopped treatment do to the meds making him sick. He hasn't progressed in 8 years and his MRI came back fine no new lesions on his brain. Praise the Lord.  I guess my question is once he gets back on his medicine I assume shots will he be able to improve and almost walk again?