ts been a long time since I have posted but I need some help. I just found out that my PFT showed an FRC of 60% which is down from 80% a year ago. My Doctors - Pulmonary and rheumatologist say that my interstitial lung disease is moving moderately fast and needs to be treated. Cyclophosphamide (and possible prednisone) has been suggested. Does anyone have any experience with this drug and has it slowed down progress, side effects etc. Thanks so much ... I am feeling quite stunned and scared about this next step.....thanks in advance.