You use Seretide­ and Ventoline to help your symptoms. The­ cough on your left side might be from asthma. It's good that the­ CT scan and X-ray of your chest were normal. Your che­st doctor likely gave you the antibiotic Azit to fight lung infe­ctions. Take all the pills until they're­ gone, like the doctor said. If the­ cough gets worse or doesn't go away, se­e your pulmonologist again. They can che­ck it out and give you a different tre­atment if neede­d.