I think everyone has had a cold or flu that resulted in heavy congestion. Then your throat gets irritated by the congestion and pretty soon you’re coughing away.
Mary at Sip and Om has a recipe for a Thyme Tea Gargle that reduces this type of cough. If you skip the salt in the recipe, you can drink this as a regular medicinal tea.
Click on the How to Make Thyme Tea to Reduce Coughing link below to see the recipe.