A Confirmatory Study of Fentanyl in Participants With Osteoarthritis or Low Back Pain

This is a multi-center (conducted in more than one center), double-blind (neither the participant nor the physician knows the assigned study drug), randomized (participants assigned study drug by chance), withdrawal study in opioid-naive participants with osteoarthritis or low back pain. The study will consist of titration period (10-29 days) and double-blind period (12 weeks) and the visits will include Day 5-7, 8, 15, 29 in titration period and Day 2-4, 8, 15, 22, 29, 43, 57, 71 and 85 in double-blind period. All the eligible participants will receive one-day adhesive transdermal patch (patch containing a drug that is put on the skin so the drug will enter the body through the skin) of either fentanyl at the dose ranging from 12.5 to 50 microgram per hour (mcg/hr) or matching placebo. Efficacy will be evaluated primarily by time to withdrawal due to insufficient analgesic efficacy. Participants' safety will be monitored throughout the study.