Some herbs counter a single symptom of a condition, but oregano acts as a triple threat, particularly against whooping cough. Oregano possesses antibacterial, expectorant and antispasmodic properties, meaning that it can fight the underlying infection, help loosen and expel the mucus in your respiratory system, and prevent painful, unnecessary coughing caused by irritated tracts and tissues. Oregano essential oil and basic oregano herbs can be easily accessed and used in many ways.