The fentanyl patch size correlates with the rate of fentanyl delivery.
fentanyl patch strength in milligrams =
= (hourly rate of delivery in µg per hour) / 10
hourly rate of delivery in µg per hour =
= 10 * (patch strength in milligrams)
The usual cumulative patch strengths range from 2.5 to 20 mg.
The usual delivery rate ranges from 25 to 200 µg per hour.
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