I am interested, too. As I've written before, Katie started oral & inhaled GSH @ 5months old. We had our first nonmucoid PA culture when she was 14 months old. The first time, it resolved with Cipro and inhaled TOBI, the second time, that didn't work, so we did IV antibitics with success. We've had 2 more + cultures, the most recent in June, and are doing TOBI again. In the past, I kept doing the inhaled GSH, but this month, I cut her down to 1 inhaled daily, hoping it would make a difference. We've just seemed to have a persistant problem with the PA. I am curious as to what others do as far as the inhaled GSH while doing TOBI? THanks!