ABSOLUTELY specific is White Horehound - as a tea or an extract. It cuts out the cough reflex, tastes nice and has no undesirable side-effects. Talk to a local herbalist about supplies if you don't already grow it in your garden. They might even have supplies of Sundew or Wild Cherry - both of which are great alone or combined together with Horehound. Equal parts of soft honey and cinnamon powder is great - just lick this as needed.