<s>[INST] 2weeks ago I started zpak for sinus infection. 4days after last pill I was put on 2nd zpack for still blowing green mucous and ill feeling. Today I m on day 3 of 2nd pack and still coughing green, chills, and tight chest.should I worry or wait to finish second round? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Yes, you should definitely consult pulmonologist and rule out lower respiratory tract infection (LETI - pneumonia). Your symptoms (brown sputum, chest tightness) are commonly seen with pneumonia. Your symptoms are not improving after 2nd round of azithromycin (z pack). So get done chest x-ray. Chest x-ray is must for the diagnosis of pneumonia. You may need higher antibiotics, bucolic and expectorant (N acetyl cysteine) Chat Doctor.   </s>