Faster than anything I've ever tried: One glass water (8-10 oz. ) drunk all at once. This thins the phlegm. Then one small plain chocolate bar, about 2-3 inches, like a "fun size" for halloween. Cough disappeared instantly for 3 hours. Had to repeat during the night, but fell back asleep right away with no coughing!
I suggest using plain chocolate (like Hersheys) without anything added to it.
The British have been researching this since 2004. Lots on Google. Works so well!
Chocolate is amazing for coughs. Research has shown it's even better than cough syrup. Not so good is sugar. When I'm getting sick, I take pure chocolate. I don't think it necessarily helps me recover from my cold or flu quicker in itself. However, having a peaceful night where I can breathe easily definitely helps me recover quicker. I have tried many types of unsugared chocolate. All are gross. Sometimes I use baking squares. Sometimes I mix chocolate powder in water. Sometimes I eat cacao nibs. I think perhaps the most effective (and this may have to do with how much I can stand) is the baking squares.
Ailment: non-productive cough, especially disturbing when trying to sleep
Cure: Dark chocolate. Buy chocolate with the highest percentage of chocolate you can find. I got 85% from a local drug store. Eat about 1/3 of the standard, rectangular-shaped sizes they sell in Europe and USA. Works for me, works for my kids.
Many researches pay attention on chocolate for curing coughs. An ingredient in chocolate could be used to stop persistent coughs and lead to more effective medicines. theobromine, found in cocoa, was nearly a third more effective in stopping persistent coughs than codeine, currently considered the best cough medicine. good try!