How is following the instructions being “exceptionally careless”?

It’s like using bleach to whiten clothes. The bottle says “do not drink”. I don’t drink it, I’m fine. If I misuse it, I’m toast, like with any other myriad household products that can kill you if you use them not as directed.

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Follow the instructions for Tylenol. And for a cough syrup. Add in Model or Nyquil. 6 hours go by, you take a second dose of each, and two days later your liver fails.

Which product's instructions did you fail to follow?

I didn’t — checked the labels for all medications I take, verified the medicinal ingredients and know not to double up on the acetaminophen.

I actually prefer cough syrups that don’t have acetaminophen precisely for that reason.

Sorry but being unable to follow instructions is a you problem not a me problem. My point stands: fail to follow instructions for potentially lethal everyday chemicals and you will end up dead. It’s not exclusive to Tylenol.