Chronic pain (pain that lasts for more than 3 months) can limit physical functioning and negatively affect a person socially and emotionally. Chronic low back pain (that is not caused by cancer) is a very common condition that affects up to a third of people in the US at any time. The primary objective of the trial is to assess functionality changes over a minimum period of 9 weeks using the Oswestry Disability Index (ODI) - a questionnaire to measure disability - in patients with non-malignant chronic low back pain who are taking short-acting opioids chronically, and who initiate treatment with Duragesic® (transdermal fentanyl). The patch delivers fentanyl in doses of 25, 50, 75, or 100 micrograms per hour. The ODI is comprised of 10 sections; each section consists of 6 response alternatives. The 10 scales assessed by the ODI are Pain Intensity, Personal Care (washing, dressing, etc.), Lifting, Walking, Sitting, Standing, Sleeping, Sex Life, Social Life, and Traveling. The secondary objective is to assess changes in health-related quality of life (HRQoL) over the treatment period using the Total Pain Experience (TPE) subscale of the Treatment Outcomes in Pain Survey (TOPS), a questionnaire designed to measure HRQoL changes in patients with chronic pain. The TOPS contains 112 items that are scored into 16 scales. These scales include: Pain Symptoms, Lower Body Functional Limitations, Upper Body Functional Limitations, Perceived Family/Social Disability, Objective Family/Social Disability, Objective Work Disability, TPE (a combination of 5 other scales), Life Control, Passive Coping, Solicitous Responses, Work Limitations, Fear Avoidance, Patient Satisfaction with Outcomes, Health Care Satisfaction, Vitality, and Mental Health (the last two from a questionnaire known as the Short Form-36, or SF-36.

Fentanyl transdermal system (skin patch) in a dosage prescribed by the clinical investigator according to the usual standard of care.