NoExcuses is right....we mispoke, it is Tobra they mix for e-flow. Treatment for CF is always a frontier and patients have tried many things over the years that have not been proven yet; unfortunately, that is the position we are put in because there is no cure. That being said, I would not compare using the e-flow with mixed abx to an abx like azithro that has been on the market for years and years or NAK which does not even require a prescription. I will be open with you guys and tell you that my fear may be unfounded; but, my concern lies more with the effect that the HS and pulmozyme has on the smallest air passages because it goes so much deeper into your lungs. That concern has NEVER been expressed to me and those are my OWN thoughts. It is just that HS is so irritating to some people and I am concerned about how it may irritate the smallest air passages. That is really my concern with the abx as well. It may be unfounded; but, I tried it for a few days and then thought better of it. I am not really too concerned about any toxic levels, though that seems to be the main concern for most docs. I guess an easier way to put it would be to say that I am concerned that it will leave me feeling tight and that my smaller airways will get pissed off at me<img src="i/expressions/face-icon-small-smile.gif" border="0">