I had a look around, and I don't really use some painkillers I have lying around. I had an injury a while ago, along with a low-impact pain, and therefore got some over-the-counter painkillers. Took 2, made no fucking difference at alleviating the pain, so I just lived with it. The injury healed up after a couple of weeks and the pain went away.
"The first principle is that you must not fool yourself — and you are the easiest person to fool." - Richard P. Feynman