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Table 1 Manufacturer recommended initial fentanyl doses based upon daily oral morphine dose in the US and UK [24]

From: Transdermal opioids for cancer pain

24-hour Oral Morphine Dose (mg/day) Transdermal Fentanyl Dose (mcg/hr)
45–134 25
135–224 50
225–314 75
315–404 100
405–494 125
495–584 150
585–674 175
675–764 200
765–854 225
855–944 250
945–1034 275
1035–1124 300