Home remedies for relieving and preventing a postnasal drip cough include staying hydrated and using a humidifier or breathing shower steam, states WebMD. These methods address the condition by thinning nasal secretions and keeping mucous membranes moist. Warm tea with honey and lozenges also soothe the throat, calming the cough.
Other temporary but effective treatments of post-nasal drip cough include the use of cough suppressants such as dextromethorphan and decongestants such as pseudoephedrine, according to WebMD. However, the Federal Drug Administration does not advise over-the-counter cough and cold medicines for children under 4, as they can lead to serious side effects.
Avoiding irritants such as smoke is an effective practice to avoid postnasal drip, the cause of postnasal drip cough, notes WebMD.