I have always cultured as sensative to Cipro, as far as I know, and it didn't help me much either (at least the oral cipro), until my ent gave me a lower dose. I don't know why, but my tummy also handled it better(that I understand <img src="i/expressions/face-icon-small-wink.gif" border="0"> ), I felt better overall (usually starting out, it really waylays me <img src="i/expressions/face-icon-small-wink.gif" border="0"> ) . I don't know if this will help you or not, but the same goes for my Tobi when I start it out, I only do 2/3 of the dose, and work my way up over a few days, and I can take it for at least 3 weeks usually.