Tuesday, October 21, 2014

Friday, March 27, 2009 melissa.cantrell, Community Member, asks

Q: Fentanyl patch and conflicting information

I have been prescribed the fentanyl patch 25 mg. After researching this drug on the internet, I have found conflicting information. I read that 100 mg of fentanyl equals 10 mg of morphine, and also that 360 mg day of oral morphine equals the 100 patch. Which is correct?


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Answers (1)
Karen Lee Richards, Health Guide
3/28/09 2:03am

Comparing fentanyl to morphine can get very confusing becasue Fentanyl patches come in micrograms (mcg) and morphine is prescribed in milligrams (mg).  Fentanyl is between 50 - 100 times stronger than morphine.  So 10 mg of morphine is equal to between 100 - 200 mcg of fentanyl.  However, fentanyl dosages are based on the number of micrograms released per hour, while morphine dosages are based on the number of milligrams taken orally every three to four hours.  This is why I said it gets confusing!


When converting a patient from oral morphine to the fentanyl patch, doctors use a formula to determine the equivalency.  They divide the total number of milligrams of morphine the patient takes in 24 hrs. by 3.6.  The result is the equivalent dosage of the fentanyl patch.  So 360 mg of oral morphine per day would equal a 100 mcg/hr fentanyl patch.  Your 25 mcg/hr patch would equal 90 mg of oral morphine per day.

PainBack07Aust, Community Member
9/27/09 1:35pm

So what about 100mg Patch and 50Mg Tramado, to control Chronic Back Pain in both the Thorasic and Lumber after accident more than 2 years ago, and pain still getting worst again after being stable for about 1 - 2 months......


I am tired of all the PAIN....and now getting lots of refered pain in shoulder just from typing. 


I don't understand.  Things work for a time and then it gets really bad again, feel like I am on a Chronic PAIN merry-go-round, and it is getting worse.

PainBack07Aust, Community Member
9/29/09 1:29pm

Recently, had a bad experience with Swine Flu, that just makes all the pain so much worse...


A specialist is recomending Lycria?


$85 AUS a box, I hope it works...

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By melissa.cantrell, Community Member— Last Modified: 12/26/10, First Published: 03/27/09