Rashila, aged 14 years, and previously in good physical health, is brought to your practice following the ingestion of an unknown quantity of paracetamol tablets about 30 minutes ago. She has been treated for depression in the last 12 months and according to her mother has been very upset following family criticism of her school performance.

On examination, she is solidly built (weight of 50 kg), rather quiet, withdrawn and uncooperative. The physical examination including vital signs is normal.

In reference to the accidental and intentional ingestion of paracetamol, which of the following statements would you consider to be true?