Thank you so much! I wished I read your post and responded earlier. My son just recovered from another round of wheezing. I gave him CS in nebulizer 1/2 tsp three times a day on the first day of cough and running nose, but it didn't work. I searched online and stopped as I am afraid of potential lung inflammation of using CS on nebulizer. I gave him 1/2 tsp orally instead. Do you have any suggestion of how I can improve my approach? When first sign comes, it's always hard for me to tell if it's infection or allergic reaction. But if I didn't see improvement, I thought it's safe to stop. How long you use it and how much dosage for a 4 year old?