5 grams a day is the upper doseing limits, 4 grams is better. There are people who have taken 10 grams with no long term damage after intervention. The problem with to much APAP is that syphtoms (sic?) will not manifest themselves for 24-48 hours after the fact. Treatment should be started within 24 hours for best results, so if you don't know how much is to much it can already be to late. Also for some reason children tolerate it better than adults, with addmissions to the ER with 15 grams onboard. After treatment no long term problems. I personally will not use it at all.
I hope this helps
A.J.