What is the best place to put a duragesic (fentanyl) patch for the most pain relief?

Any place: Anyplace on the body. Recommended to alternate areas of the body to reduce localized irritant dermatitis.

Any: The patch works by releasing its medication into the fat under the skin. Then blood vessels going by the area absorb the medication into the bloodstream and transport it to the brain where is finds it receptors. Therefore, there is not need to place the patch over the painful area. Any hairless area will do.