Thanks for the query.
Coughing out green phlegms is considered to be pathognomic of infection of a micro-organism called pseudomonas
, which is little bit tough bacteria to be eradicated. What I feel is you must go for a sputum examination (gram staining, culture, AFB) to know the sensitivity pattern of the bacilli to the antibiotics, so that appropriate antibiotics can be given.
Secondarily if AFB test in sputum is positive, then its tuberculosis
for which 6 months of treatment is warranted.
Alternatively you can go for bronchoscopy
, to visualize the airway and samples collected may be processed and guide the treatment....