Honey, probiotics, bromelain, peppermint, eucalyptus, marshmallow root and thyme suppress a persistent cough, according to Healthline. Seek professional medical care if the cough produces thick, colored, foul-smelling mucus or becomes violent.
Mix honey with warm water and lemon or herbal tea to suppress coughs, recommends Healthline. Probiotics balance the bacteria in the intestines to boost the immune system, which lowers allergic reactions and the risk of a cold or flu. Use caution when ingesting dairy to avoid thickening mucus. Bromelain suppresses coughs, loosens mucus and relieves sinusitis. It is found in pineapples or can be taken in supplemental form. Bromelain supplements can affect antibiotics, and adults using blood thinners should not take them. Children should not take bromelain supplements at all.
Peppermint suppresses coughs by dissolving mucus, explains Healthline. Create a steam bath by adding peppermint oil to hot water. Place a towel over the head and deeply inhale to allow peppermint vapors to break down mucus. An ointment composed of eucalyptus oil, coconut oil and beeswax provides similar results. Thyme leaves contain flavonoids that reduce inflammation and relax the throat muscles used during coughing. A tea of thyme leaves and boiling water releases this compound to suppress a persistent cough.