Since How long is this cough?
Smoking?
Any H/O TB in past?
How did this cough started associated with any other symptom?
You will require couple of investigation like most imp Chest X ray PA view,CBC,
CRP,Sputum examination.
Kindly take an appointment or visit nearby General Physician ASAP.
As you might require some antibiotic.
Health Tips
If smoking present then Quit smoking completely.
continue with salt water gargle,Steam Inhalation thrice/four times daily.
Can take cough syrup if required.