Glad you rang Meg. First thing I was going to say was "Relax". The thing with panadol is that, as someone else said, it does take a very high dose or long term use to cause perm damage. It is also worth keeping in mind that medications such as panadol and neurophen are also weight based. So depending on your child's weight, you may acutally need to give more than is on the side of the box.

Hope your little man feels better soon.

MG