So I stopped Cayston for awhile cause I felt like it was not keeping me clear and lots of increased coughing. Went back to Tobra.... Now started back on Cayston and the coughing is increased again. But I mean, how do you REALLY know it is the Cayston that is not a good option and TOBRA is better or I just have a bug or increased bacteria that I always grow is happening. Yes, I can do the sputum culture and see but how do you really know it is the med that is not working out well.....<br>