Doxycycline
"Used twice for Atypical Pneumonia and when all other drugs failed this one always works.  I've had pneumonia twice in last year the first time for 3 months. A pulmonary specialist was called in from within the hospital and he prescribed the doxycyline and it instantly worked - in about 24 hours I felt almost normal. 



This time round same experience - 1st we tried my new doctor's way and then doxycycline and it worked."