Moderate-to-severe chronic pain
Second line
Used in moderate-to-severe chronic pain with limited response to non-opioid agents. NG193 (2021) and 2018 do not place opioids as first-line for chronic non-cancer pain; they are considered only when alternatives fail. Starting dose: Transtec 35 mcg/h (patch changed every 96 hours); Norspan 5 mcg/h (weekly patch). Preferred in older patients and renal impairment due to lower accumulation. Long-term use with scheduled reassessment every 3 months and attempted gradual dose reduction.