Yes, they had use do it like that when it was still in clinical trials and it works when you have an infection. Pulmozyme alters the DNA of your mucus and makes it thinner, thus eaiser to cough out. By doing it twice a day, you are just thinnig out that sticky stuff that bacteria loves twice and thishelps you get over it faster. So why no do it twice a day, all the time? Because there are some serious chemical processes taking place and it is never good to overload the body on those. How often are you doing TOBI, and what other nebs are you on? The order I go in is albuterol-pulmozyme-pt-TOBI. You should always do your TOBI AFTER pt so the med has a chance to sit in there and work. If you're strapped for time, maybe do your 2nd pulmozyme while your sitting in bed reading or something. I usually do mine while I watch the news. Do you have a vest? I have cultured for b. cepacia and my doctor told me that in several cases, it is possible to get most of that out with agressive pt and nebs rather than antibiotics.Debbie22 yr old w/ CF in CO