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By Ben Mills - Own work, Public Domain,

Fentanyl Dose Calculator

Fentanyl Dose Calculator

Fentanyl Dose Calculator Dose Calculator

Based on calculations of 500mcg (2 vials of 250mcg) in 50cc NS

Title: Understanding Fentanyl Dosage Calculations

The Fentanyl dose calculation can be simplified as follows:

Fentanyl Dose (mcg/kg/hr) = (Dose * 10) / Weight 


  • Dose is the amount of Fentanyl given to the patient.
  • Weight is the body weight of the patient in kilograms.

The multiplication by 10 is a conversion factor that adjusts the units of the dose.

Let’s take a look at three examples to make this clearer:

Example 1:
Consider a patient with a body weight of 70kg who is given a dose of 3 mcg of Fentanyl. Here’s how you would calculate the Fentanyl dose per kilogram per hour:

Fentanyl Dose (mcg/kg/hr) = (3 * 10) / 70 = 0.4 mcg/kg/hr 

Example 2:
For a 50kg patient receiving a 5 mcg dose of Fentanyl, the calculation would look like this:

Fentanyl Dose (mcg/kg/hr) = (5 * 10) / 50 = 1 mcg/kg/hr 

Example 3:
For a 80kg patient with a 2 mcg dose of Fentanyl, the Fentanyl dose would be:

Fentanyl Dose (mcg/kg/hr) = (2 * 10) / 80 = 0.25 mcg/kg/hr 

These calculations are crucial for healthcare professionals in the ICU to provide the correct sedation level for their patients. However, it’s important to note that the typical dose of Fentanyl for ICU sedation varies from 1 to 6 mcg/kg/hr.

There you have it! This simple formula allows medical professionals to quickly determine the right dosage of Fentanyl for their patients based on their body weight. Always remember, though, each patient is unique, so these calculations should be used as a general guide rather than an absolute rule. Always consider individual patient circumstances and consult with healthcare professionals when adjusting medication dosages.

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