Is there any methodology according to Bible to drive out demons from possessed people? There are numerous instances in the Bible where Jesus drives out demons from people who were possessed by them. If we take a general view of these events during the ministry of Jesus, we find that there were a number of such miracles performed by Jesus apart from other miracles. Sometimes these demons were themselves testifying about who Jesus was.  

Recently we saw even Pope Francis performing what was called as exorcism on one of the visitors to him. So we can say that it is something similar to what Jesus was doing during His ministry.  

The question is why this practice of driving out of demon is not very common nowadays in Christianity? And Is there any methodology according to Bible to drive out demons from possessed people?
Acts 16:18 (NIV)  She kept this up for
  many days. Finally Paul became so annoyed that he turned around and
  said to the spirit, “In the name of Jesus Christ I command you to come
  out of her!” At that moment the spirit left her.


Apostle Paul cast out the evil spirit by using the name of Jesus Christ. Anyone who believes Jesus Christ is given the power to drive out demons by faith and prayer. 


  Mark 16:16-18 (NIV) Whoever believes and is baptized will be saved,
  but whoever does not believe will be condemned. And these signs will
  accompany those who believe: In my name they will drive out
  demons; they will speak in new tongues; they will pick up snakes
  with their hands; and when they drink deadly poison, it will not hurt
  them at all; they will place their hands on sick people, and they will
  get well.”


Some evil spirits are so powerful that it require more prayer and faith.


  Mark 9:29 (NIV) He replied, “This kind can come out only by prayer.”


As we can see in these verses, it's quite simple. It only require faith and prayer followed by pronouncing the name of Jesus Christ. But the most problematic here is having faith, which can be achieved through prayer and experience only. I myself once participated in an exorcism performed by our pastor. All we did was pray, sing songs and command the evil spirit to come out in the name of Jesus Christ, and it worked :-)

The methodology is simple. Prayer, Fasting and Commanding in the name of Jesus Christ. But it is not easy. Method is simple, but not easy to carry it out. It needs a lot of faith, personal relationship with God and patience.