The Effectiveness and Tolerability of Fentanyl Matrix in Chronic Non-cancer Pain; Assessment of Patient's Pain Treatment Goal Achievement

This is a multicenter, prospective (a study in which the patients are identified and then followed forward in time for the outcome of the study), open-label (all people know the identity of the intervention), observational study intended to examine the effectiveness of Fentanyl matrix through the degree of improvement of pain. Fentanyl matrix is a transdermal (through the skin) system providing continuous delivery of fentanyl for 72 hours. Fentanyl matrix will be administered to patients with chronic (prolonged) non-cancer pain under routine practice during 12 weeks. Dose will be adjusted in accordance with patient's degree of pain and treatment response in the investigator's judgment.