Standard Opioid Conversion Chart
Prepared by: Palliative Meds Info. (See www.olh.ie for Terms and Conditions.) Reviewed; January 2014 Review: January 2015
Opioid Conversion Chart
There are differences in the literature regarding opioid conversion ratios. The conversion ratios listed below are the conversion ratios commonly used in practice at Our Lady’s Hospice and
Care Services (OLH&CS). The information outlined below is intended as a guide only. ALL OPIOID CONVERSIONS OUTLINED BELOW ARE APPROXIMATE ONLY. Therefore, all medication
doses derived using the information below should be checked and prescribed by an experienced practitioner. The dosage of a new opioid is based on several factors including the available
equi-analgesic dose data, the clinical condition of the patient, concurrent medications and patient safety. It is recommended that the new dose should be reduced by 30-50% to allow for
incomplete cross-tolerance. The patient should be monitored closely until stable when switching opioid medications.
GOLDEN RULE: WHEN CHANGING FROM ONE OPIOID TO ANOTHER ALWAYS CONVERT TO MORPHINE FIRST.
ORAL MORPHINE TO ORAL OPIOIDS ORAL OPIOIDS TO PARENTERAL OPIOIDS PARENTERAL MORPHINE TO OTHER OPIOIDS TRANSDERMAL OPIOID TO ORAL MORPHINE
PO → PO RATIO PO → IV/SC RATIO IV/SC → IV/SC RATIO TD → PO RATIO
Morphine → Oxycodone 1.5:1
Morphine → Morphine
2:1 Morphine → Oxycodone 1.5:1
Buprenorphine → Morphine 1:75
Morphine → Hydromorphone 5:1 Oxycodone → Oxycodone 2:1 Morphine → Hydromorphone 5:1 Fentanyl → Morphine 1:100
Hydromorphone → Hydromorphone 2:1 Morphine → Alfentanil 15:1
National and international guidelines also support the use of a 2:1 ratio when switching between morphine and oxycodone.
Oxycodone is available as immediate release capsules 5mg, 10mg and 20mg, liquid 1mg/ml or 10mg/ml and sustained release tablets 5mg, 10mg, 20mg, 40mg and 80mg. Oxycodone solution for injection is available in 10mg/ml and 50mg/ml strengths.
See ‘The Use of Alfentanil in a Syringe Driver in Palliative Medicine’ document available from the Palliative Meds Info webpages http://www.olh.ie/7-departments/166-palliative-meds-info/. Doses have been rounded to the nearest whole number or the nearest first decimal point.
# Transdermal fentanyl and buprenorphine patches are prescribed in micrograms (mcg)/hour. Equivalent doses are based on the 24 hour dose of fentanyl or buprenorphine received from a patch. See product literature for further information.
* Based on buprenorphine to morphine ratio of 1:70-83.
(Note: This table does not incorporate recommended dose reductions of 30-50%.)
24 hour dose
24 hour dose
A 2:1 ratio with morphine may also be used.
See preparations outlined below.
24 hour dose
24 hour dose
ORAL IV/SC ORAL IV/SC ORAL IV/SC TRANSDERMAL
5mg 2.5mg 3.33mg 1.66mg 1mg 0.5mg - - -
10mg 5mg 6.66mg 3.33mg 2mg 1mg - 0.3mg 5 micrograms/hour
14.4mg 7.2mg 9.6mg 4.8mg 2.88mg 1.44mg 6 micrograms/hour 0.5mg -
20mg 10mg 13.33mg 6.66mg 4mg 2mg - 0.7mg 10 micrograms/hour
28.8mg 14.4mg 19.2mg 9.6mg 5.76mg 2.88mg 12 micrograms/hour
30mg 15mg 20mg 10mg 6mg 3mg - 15 micrograms/hour
50mg 25mg 33.33mg 16.66mg 10mg 5mg - 1.5mg 25 micrograms/hour
60mg 30mg 40mg 20mg 12mg 6mg 25 micrograms/hour 2mg 35 micrograms/hour
100mg 50mg 66.66mg 33.33mg 20mg 10mg - 3.3mg 52.5micrograms/hour
120mg 60mg 80mg 40mg 24mg 12mg 50 micrograms/hour 4mg 70 micrograms/hour
150mg 75mg 100mg 50mg 30mg 15mg - 5mg
180mg 90mg 120mg 60mg 36mg 18mg 75 micrograms/hour 6mg
240mg 120mg 160mg 80mg 48mg 24mg 100 micrograms/hour 8mg
Standard Opioid Conversion Chart PDF
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