Hmmm... are you English?
Just so that everyone is on the same page, Acetaminophen=Paracetamol=Tylenol=APAP...
They just refer to it as Paracetamol in the U.K. and elsewhere for some reason. Maybe it's just one of those stubborn Brit things?
Anyway, just though I'd clarify - in regards to your question, I personally would not want to ingest 8 x 500mg of APAP! that is 4 grams my friend, and although there are undoubtably those who will probably say it isn't going to do shit I don't like the idea of liver damage. I personally would never take any more than 2 grams of APAP at one go, and prefer to take even less.
If you're interested in more info on APAP toxicity, I recommend the following site:
http://www.mnpoison.org/acetaminophen.htm
Goodluck!
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"I dislike the drug you are using, but I would defend with my life your right to use it."
- Paraphrase on Voltaire
"He who makes a beast of himself gets rid of the pain of being a man."
- Dr. Johnson
"We do not sense imagination enough to sense what we are missing."
-Jean Toomer