I have had a recurring sinus infection, which was treated with antibiotics and steroids back in May. I also have cough variant asthma, and it always ends up in my chest. I have this infection again, and started taking steroids mostly to clear up the lungs. This time around it is less intense, but my fear is developing pneumonia. The mucus is clear but thick, and I still have a dry cough which doesn t produce much phlegm. Do I need an antibiotic again to get over the hump with this? My resistance hAs been somewhat compromised as I was on radiation treatment in May for stage 1 breast cancer, which was successfully treated.