I've been prescribed slightly more than 5g per day (2 x 650mg tablets every 6 hours) for pain after an operation jointly with ibuprofen, which is scarily close to the limits.

I managed to overdose by accident with severe dental pain. Wasn't thinking straight, took about 8g - which is even more scarily close to the limits.

I'm fairly sure that caused some liver damage. I wasn't aware of anything apart from feeling a bit weird.

At the time, I had no idea it was potentially deadly.