My cousin is a toxicologist and he was talking about this in the 1980s - that the public had no idea how incredibly toxic Tylenol is and how easy it is to over dose on it and cause significant damage to your liver and other organs.
The worst is that if you "OD" on tylenol, you won't die right away, but instead slowly and increasingly painfully over time, perfectly aware of what's going on.
Depends on the country. In the UK people typically are aware of the dangers of acetaminophen, and you can't buy giant bottles.