My 79 year old Mother had an upper respiratory infection. She could not shake the cough. I had recently read an article that said steep 1 teaspoon of your kitchen variety thyme in a cup of hot water, as you would a teabag, and sip. She tried it and it worked. Encouraged, I told my friend who has the start of COPD about it, she tried it and is amazed also. The article stated it relaxes the bronchials. Yet another alternative.