I may be the only one who had problems with it and had to stop it. I hated the eflow to be perfectly honest. It made the mist <b>so</b><b> dense </b>that it took my breath away and i could not continue to inhale it. It got worse and worse with each dose so after a month i dropped out. My Nurse is trying to find out if my insurance will pay for Azyreonam for me to inhale in a regular nebulizer. It clearly wasnt the medicine that bothered me, it was the density that the eflow produced it to be. I hope you have better luck with it then i did John. I'm sure you will.