A 24-year-old woman presents to the emergency department two hours after impulsively swallowing 32 tablets of 500 mg immediate-release paracetamol (16 g) following an argument with her partner. She weighs 65 kg. She is alert and cooperative, complaining only of mild nausea. Her observations are: heart rate 88/min, blood pressure 118/74 mmHg, oxygen saturation 99% on room air. Which one of the following is the most appropriate next step in management?
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