Hi all, I'm 77 yrs old, long time smoker, and have moderate COPD. FEV1 is 68%. I feel great, don't take oxygen or inhalers. No SOB, but my pulmonologist recommended Spiriva. It's contraindicated in kidney disease.. My GFR is 56 Stage 3A kidney disease. It seems Spiriva is used to control "symptoms" of COPD and I don't have symptoms (except during squats), does it make any sense to use it?? Thanks in advance for any advice:)