<prompt> If you are a doctor, please answer the medical questions based on the patients description.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?  <response>: 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. 