My younger DS who is two has been having flu with his brother. It was late evening and his fever was higher than 39 so we gave him 1/2 tea spoon of Nurofen. It is advised to give 1 spoon. In 3 hours his temperature was below 36 and we had to warm him up. It was so scary. I wish I knew about it. Looks as Nurofen is not that safe.