Post-infectious cough or post-viral cough is a subacute cough that lasts anywhere from three to eight weeks. Most studies have shown that the cough tends to get better on its own without any medication.
People with recurrent pneumonia or a long history of smoking should seek medical attention if they experience a persistent cough. Doctors should advise patients to schedule a follow-up appointment for continued treatment if their cough has not gone away within 8 weeks or if it is new and symptoms appear.