If I was going to be cheeky and take more than the recommended amount, I would be looking up the per kg dose and going by that ... I guess. But much safer to use iboprofen or codeine or diclofenac or aspirin than too much paracetamol.
cockney paracetamol is actually quite liver toxic. a relatively small amount can damage the liver badly (kill you). especially when he liver is burdened by other things like drinking. op, try drinking water and hot water bottle first and go to the chemist or gp if it still is bad.
Never ever take more paracetamol than it says. Paracetamol has a very narrow band between the amount you need to take for it to do anything and the amount you need to take for it to start damaging you.
You CAN take the full dose of ibuprofen and paracetamol at the same time as they do different things. (and ibuprofen is much more forgiving if you take a bit more than it says)
It's 6-10% of caucasians apparently, DP doesn't have it either. When you've just had a nasty wisdom tooth extracted and been given high-ish dose of codeine is not a good time to find out that it doesn't work!
Thats unreal, I always thought he was being a wimp when he said he was still sore after taking it! He was in a car crash a few years ago and ended up with severe whiplash and back pain. Was off work for weeks and had months of physio before it started easing. Will have to tell him there is a reason for it not working, he'll be chuffed! And no, I can imagine after a tooth extraction is not a good time to discover that at all!
You can test if he is a wimp if you like - get some codeine and give him teh max dose then make him walk in a straight line and touch his fingers to his nose with his eyes shut, or say the alphabet backwards!
Never take more than advised paracetemol, not worth the risk. I used to flatshare with an intensive care nurse who worked in the liver ICU. Lots of accidental overdoses from people who had taken the tablets with flu drinks or other combinations. Often fatal because they had not intended harm and were oblivious to the damage done until their organs started failing. Apparantly it's not uncommon to feel fine for a couple of days and then collapse - by then it's often too late.