My Googling says 7.5g-10g is a lethal (acute) dose for an adult. The extra strength Tylenol pills come in 500mg, and they recommend two of those at a time. Not saying it's wrong that the gap between "effective" and "lethal" is small, but at the same time it's hard to accidentally take 15-20 pills at a time.
Even doses as low as 1g taken daily for a week or two will show significant changes in liver chemistry. Consider that many other medicines, especially cold medicines, often include it as well, and it's not hard to see how someone that is suffering from a strong cold could end up taking more like 2-3g per day for extended periods of time. That will definitely cause some damage to the liver, which can be recovered from, but should probably be avoided. At least in the US though, many people have already compromised liver function due to chronic metabolic diseases, and for many, the damage might end up being permanent.
Now consider people with memory issues such as dementia where they might have a headache, take 2 pills, then 10 minutes later think 'I have a headache...'
if we're talking about people with dementia and/or memory issues - almost everything becomes dangerous. Not an argument. Doors aren't dangerous, but now imagine a small child being hit with one.
