After reading so many comments, I am a little concerned that my doctor has said nothing about how I can/should take care of my lungs other than taking the three prescriptions. He just doesn't give me much information, other than I have MAC. I don't even know which kind. He did a culture, but told me nothing about the results. Mine is not very bad, but I'd like to keep it from getting worse. I am 79, and weigh only 95 pounds. I have several other health issues that I am learning to deal with, but by far, the CFS is the hardest! Sounds like I need to drill my doctor...