I have been on the Colistin for over a year now. He has kept me on it for maintenance and it seems to be working. With the pseudomonas being colonized, there does not seem to be a possibility of eradicating it so this seems to be the next best thing. He was going to take me off of it had I needed to go on MAC therapy but that seems to be rather stable right now. Nebulizing the Colistin is definitely the best route and luckily there does not seem to be any side effects!!! I have had good results and am thankful for this medicine.