High enough dose destroys your liver. The bad thing is, it takes time. Two weeks. Most if not all painkillers work through your liver so so much for relieving any pain, which will be fucking agonizing as your organs slowly shut down. Basically if you don't fall unconscious you'll scream until you lose your voice or life. Broken bones isn't even close to that kind of pain, that's like level 3 compared to level 100. If you want something to compare with.