Comment by semanticist

Possibly the important missed part here: the effective dose for paracetamol is alarmingly close to the dangerous dose.

Dosage rules allow for 4g/day, 5g/day can cause liver damage. It's also common to find paracetamol in multiple products - so you can take some painkillers, then not realise that the lemsip you're taking for the sniffles also has paracetamol and now you've put your liver at risk.