Our CF center is switching my 7 YO son from Tobi to Cayston. The paperwork takes some times so we haven't received anything yet. They would like me to try it with my almost 4 YO DD for a dose or two and see how she does, she also cultures PA and has a lot fo toruble with TOBI. It gives her a nasty cough, bloody noses, etc every time. It really irritates her. They don't know if she'll be able to do it since it's a mouthpiece and not a mask. But I'm hoping she'll be ok aince it's only 3-5 minutes. Anyone have a little one using an e-flow? I thought maybe I could have her use the nose clips they use when doing PFT's to stop her from breathing out of her nose