Thanks for posting your query.
The history, symptoms of quadriplegia
and the treatment all indicate the your brother has a very serious disease affecting the nervous system.
Most likely the disease is Guillain Barre syndrome but it can be due to other problems like myasthenia gravis
, peripheral neuropathy
, periodic hypokalemic paralysis
etc. to name a few.
IV-Ig is the gold standard of treatment for GBS, although the steroids also can be tried but with less apparent benefit.
Patients show slow and variable recovery. in these disorders at times it takes long time and is only partial.
Nervigen is a combination of calcium, pantothenate and lipoic acid
and is a good supotive drug although no apparent benefit is visible with this treatment.
Hope I have answered your query.
If you have any questions I will be happy to answer.
Please close the query if you have no other questions.
Wish you a good health.