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.