Randomized Controlled Open Labelled, Phase III Trials, Comparing the Efficacy between Fentas(R) and Durogesic(R) Patches in Controlling Cancer Pain: Multicenter Trial.

Purpose: Fentanyl is a synthetic opioid and transdermal therapeutic system (TTS), designed to release the drug into the skin at a constant rate, ranging from 25 to 100 microgram/hr, for up to 3 days. For the control of chronic cancer pain, Durogesic(R) patches (Janssen Co., USA) are now widely used.