which IV antibiotic are you on Pegs? How long are you supposed to stay on it? 1 week on and 3 off of Toby is unusual. I wonder if that is a new protocol? Usually it is 2 on 2 off or 28 on and 28 off. Not bringing up as much sputum is probably a good sign the IV is working. Perhaps the stronger saline along with Toby is too much and you might try the 3% while on Toby? Just a thought. No doubt your Dr will have input on that.