What is the best way to suppress a cough?

Find and treat cause: There are over the counter medications such as dextromethorphan containg cough syrups which may be helpful. Airway hyperreactivity with inflammation and congestion is the small airways is a common cause which can be treated effectively with asthma medications. Esophageal reflux, sinusitis are common causes. A chest xray can help detect other possibilities.