While listening to the nurse read from the medical hand book, I was reminded of buying WD-40, a spray lubricant for locks. If purchased from a scientific supplier, it comes with a 20 page material safety data sheet. OR, you can buy the lubricant off the shelf in the hardware store with no cautions. As a result, it’s hard to tell if a substance is harmful or not. Charles and I both listened intently to all the medication cautions and tried to determine what were the most likely symptoms that we need to watch for. But it is difficult to separate the obvious from the minutia.