Common Drug, Common Mistake

Another GH article:

Most people who use Tylenol and other brands of acetaminophen are not aware of the drug's risks, a smart people survey found. Too much acetaminophen can cause liver damage. But nearly 60% of the smart people surveyed said they weren't aware of that. They also didn't know that acetaminophen is an ingredient in many combination pain and cough-cold medications, putting them at risk for overdose if they use several products at once.