Actually, it is available and has been used for several years now at certain high-level CF clinics (e.g. Johns Hopkins). I used it for several months at one point. I got it compounded from Foundation Care, if I remember correctly. Your doc can order it from them. Be warned, it tastes really nasty and can cause some pretty serious coughing, at least it did for me. But then, we wanna get that stuff out, right? It's not manufactured for inhalation, they just compound the IV form of it for inhalation, so it gets a little weird. Might be worth talking to your docs about it though.