Acetaminophen is the most popular over-the-counter drug for pain relief.
It is found in Tylenol® as well as many other brands. Many people will have heard about its toxicity, that it is responsible for an estimated 56,000 ER visits, with 458 deaths per year. This is due to acute liver toxicity. 
I don’t know about you, but I’ve heard this many times. It’s old-hat news too me, which is why I haven’t taken this drug in well over a decade. But that’s not what I’m writing to you about today.