new member from Kazakhstan

Hello guys!
I am from Kazakhstan. And I am 20 years old. Well my dad was diagnosed with GBS one year ago then it transmitted to CIDP. He has been using the prednisolone for half and year well there was breaks in betweens.
Now he is using it over 3-4 months. First he had it from the venuse now taking tablets.
Before using the prednisolone he`s illness was repeated. So we are very much afraid that after stopping using the medicine is it possible that he can be repeated? How dangerous is this?
Please can you guys help me about this if you have personal experience and also he is having temperature about a month now and doctors don`t know why it is like this?
Thank you