Myself  have done without pain killers through out my life  and here is a good example why.

At the end of January the FDA held a public hearing to reconsider the safety of Darvon, a painkiller that has been on the market since 1957. The panel voted 14 to 12 in favor of withdrawing the drug from the market, following in the footsteps of the United Kingdom which banned the drug in 2005 after concluding the benefits of Darvon did not outweigh the serious risks.