It is a common misunderstanding that paracetamol is safe in small overdose - it is not. The margin between safe and toxic is quite small.
"Paracetamol is a nasty drug. You may poison yourself by mistake, but by the time you start feeling unwell you may be approaching the end of the (roughly) three-day window in which the antidote, acetylcysteine, can save you. Would-be suicides may take a handful of pills expecting to drift into a pleasant sleep, only to find that nothing happens. By the next day they may well have changed their minds about killing themselves – but it's too late: the drug, by then, is already doing its best to destroy their liver." - this is what happened to the lad I mentioned above. He regretted what he had done, but the clock could not be turned back. It was harrowing.
So don't deviate from the stated dose please! - and if you are forgetful (like me) then it is best to note down when you have taken them.