Paracetamol has such a narrow therapeutic range, that it really is a dangerous drug. Especially for short, slim women, who can be at risk of overdose even by following the instructions on the packet.
For adults of 50kg and under, the maximum dose is 15mg/kg per dose, 4-6 hourly, 4 times per day, with a total daily dose of 60mg/kg. So a maximum for a 50kg adult of 6 tablets in 24 hours. The box directions say up to 8 tablets in 24 hours.
Acute paracetamol poisoning is awful, and people can need liver transplantation if their situation is caught too late for gastric decontamination with activated charcoal and administration of n-acetylcysteine. Often overdoses are taken in haste and repented of later.
However, the unappreciated danger of unintentional staggered overdose is desperately sad, as the patient has no idea what is wrong with them and it is often far too late when paracetamol becomes the suspect for the symptoms. They are more likely to go into multi organ failure, more likely to need life support, and more likely to die.
I've read, many times, that if paracetamol was being licensed now, it would not get an over the counter licence. Anything that makes people take it more seriously as a drug and see it less as the 'Smarties' of pain relief, before you get to the 'real' painkillers, is a good thing.