Lots of people really swear by it. The main toxicity risk is acetaminophen poisoning.
Here's an example. One of my friends, who does not work in health care, was given generic Darvocet after she cut off the end of her finger (slammed into a file cabinet at work)
and she told me that even though she was taking the maximum dose of Darvocet (6 a day), she had some breakthrough pain and was also taking the maximum recommended dose of Tylenol.
We were on the phone, and my response nearly blew out her eardrums. She said, "Was I not supposed to do that?" and I said, "No, you weren't!" She only did it for a few days, and interestingly, her finger grew back although it doesn't look like what she was born with.