E.F.
I use desymal (i think that's how you spell it). You can give it to two years old and up. It lasts 12 hours, but really only 8 but it works through the night. I also use vick's vapor rub. Some time if the vaporizer is on too high it will cause more coughing because it is loosing up the stuff in her lungs and making her cough it up. So keep it on but perhaps turn it down if possible. Switching to a cool mist humidifier may be better for her. That way you can keep it on a lower setting.