Opioid Conversion Guide Chart - Western Australia
OPIOID CONVERSION GUIDE
These conversions are a guide only.
Patients may vary in their response to different opioids. After changing
opioid, close assessment should follow and the dose altered as necessary.
Equianalgesic doses of oral opioids
Oral opi oid
Conversion factor
(opioid dose x or ÷ by factor
= morphine dose)
Practical
equianalgesic
dose
morphine
10 mg
hydromorphone
x 5
2 mg
oxycodone
x 1.5
5-7 .5 mg*
codeine
÷ 8
75-90 mg*
tapentadol
÷ 3
50 mg*
tramadol
÷ 5
50 mg
* dose guided by strength of medication available
Methadone conversions are complicated and prescribing should be restricted to medical
specialists with experience of methadone prescribing for pain management.
Subcutaneous route conversions
Opioid
Oral dose
Equianalgesic
subcutcutaneous
dose
Conversion factor
(oral dose ÷ by fact or
= subcut dos e)
morphine
30 mg
10 mg
÷ 3
hydromorphone
6 mg
2 mg
÷ 3
Transdermal preparation conversions
Opioid
Patch strength
Equianalgesic or al
morphine dos e
buprenorphine
5 microgram/hr
12 mg /24 hrs
fentanyl
12 microgram/hr
30-45 mg/24 hrs
Sublingual preparation conversions
Opioid
Dose
Equianalgesic or al m orphine
dose for pai n
buprenorphine tablet
200 microgram
8-16 mg
fentanyl lozenge
200 microgram
no direct conversion
initiate 200 microgram lozenge
and titrate to eff ec t
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