This story contains important information about the pain reliever acetaminophen. Acetaminophen is not just Tylenol, but is in a lot of over-the-counter (OTC) and prescription drugs. A lot of people don't realize that improper use of OTC drugs can be extremely harmful. Just because you can buy something without a prescription doesn't make it safe for you to take the whole bottle, or to mix any two random medications.
I once took several different medicines to treat a cold and didn't realize that each of them contained a big dose of acetaminophen. I wound up vomiting blood. So be careful, unless you've always wanted to puke blood or try your luck at a liver transplant.