Fentanyl Patch Starting Dose From a Prior Opioid (FDA Label)
The starting fentanyl patch strength the FDA label's tables give for a prior opioid.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Current opioid and route
- Oral morphine
- Total dose over 24 hours
- 100 mg
- Opioid tolerant by the label's definition
- Yes
Result: The label's table gives 25 mcg/hour for 60 to 134 mg/day of oral morphine; 100 mg/day is in that band.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Current opioid and route
- Total dose over 24 hours
- Opioid tolerant by the label's definition: yes or no
How this is calculated
Citation
FDA label on DailyMed: fentanyl transdermal system (SpecGx), section 1 (opioid-tolerant definition) and section 2.3, Tables 1 and 2 (dose conversion from other opioids; not equianalgesic, one way only). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.