bronchitis
"I'm currently on day 4 of 10 taking Doxy twice a day.  My doctor thought I had a touch of bronchitis, although I was thinking possible pneumonia.  Anyway, I felt better almost immediately after taking the first dose or two, but it's still not the full relief I was hoping for.  My cough is just slighly looser and I definitely feel better, but I'm still coughing quite a bit and wheezing.  I was prescribed another time a few years ago, and I'm pretty sure I remember it taking a good 8 or 9 days to completely kick in.  I'll try to remember to post update in another few days. I'm really HOPING that this kicks in stronger sometime in the next 3-4 days. Tired of coughing."