Medicine is a tricky thing to have on hand, as there are so many different medications for so many varying ailments. There are some popular ones you can keep around. A pain reliever such as acetaminophen or Ibuprofen can be used for minor aches and pains. If someone is having allergylevel burns.
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If someone is on fire, every second counts. One can greatly accelerate the firepaper'>reduce the area and depth of burns.