My DS (5) has always vomited on contact with Panadol and he can't have Nurofen. If he really needs the Paracetamol I use PR Panadol. Erm... that's per rectal. Make sure you use lube and be gentle. Available over the counter at the chemist. We don't use it very often and if we do he is usually so lethargic and unwell or febrile that he doesn't care.