asthma
"I've been on and off Dulera for several years.  After using it regularly for a month or two I invariably get a low-level infection in my lungs/bronchial tubes.  Major yellow-to-brown phlegm, constantly coughing.

Then when I go off Dulera, after a few days the infection self-cures and the phlegm and coughing subside.  But then of course the asthma comes back.

For me there's no magic solution (yet!).  I'll probably not use Dulera any more, too afraid of the infections it encourages."