Fentanyl Patch Oral Morphine Conversion — FRCA Final MCQ

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HardPain MedicineFentanyl Patch Oral Morphine ConversionFRCA Final

Fentanyl 75 mcg/h patch to oral morphine conversion: approximate 24h oral morphine?

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Correct answer: C — 180 mg

Fentanyl 25 mcg/h ≈ 60-90 mg oral morphine/24h (BNF uses 60 mg). At 75 mcg/h: 75/25 × 60 = 180 mg/24h. Start conservatively, monitor, titrate. Remove patch 12-24h before starting oral (depot effect).

Reference: BNF – 2025 – Fentanyl patch conversion