Hi, my grandma used to make us drink strong black tea each time we had the flu, as it would stop vomiting and help settle the stomach. I have tried it with green tea as well and it works the same, and usually you don't need more than a few sips before it starts working. Now I don't even wait for the vomiting to start--I go straight for the tea upon first symptoms of the flu. I have also used this remedy for severe menstrual cramps and diahrrea and those times when painful gas gets in the way of elimination. One time I even tried it for a headache and it went away. Works wonders!