Change
from (total daily dose in mg) 
Change
to (total daily dose in mg) 
Oral codeine 
Oral dihydro codeine 
Oral pethidine 
Oral morphine 
Oral dextro moramide 
Morphine infusion 
Diamorphine infusion 
Oral hydro morphone 
Sublingual
buprenorphine 









Oral codeine 









Oral dihydrocodeine 









Oral pethidine 
Divide by 12.5 
Divide by 10 
Divide by 10 

Multiply by 2 
Multiply by 3 
Multiply by 4 
Multiply by 7.5 
Multiply by 50 
Oral morphine 
Divide by 25 
Divide by 20 
Divide by 20 
Divide by 2 

Multiply by 1.5 
Multiply by 1.5 
Multiply by 4 
Multiply by 25 
Oral dextromoramide 
Divide by 40 
Divide by 30 
Divide by 30 
Divide by 3 
Divide by 1.5 

Multiply by 1 
Multiply by 2.5 
Multiply by 20 
Morphine infusion 
Divide by 40 
Divide by 30 
Divide by 30 
Divide by 3 
Divide by 1.5 
Divide by 1 

Multiply by 2.5 
Multiply by 20 
Diamorphine infusion 
Divide by 100 
Divide by 75 
Divide by 75 
Divide by 7.5 
Divide by 4 
Divide by 2.5 
Divide by 2.5 

Multiply by 7 
Oral hydromorphone 



Divide by 50 
Divide by 25 
Divide by 20 
Divide by 20 
Divide by 7 

Sublingual
buprenorphine 
Intended as a guide only  titrate individually according to
pain, response and side effects.
Dose conversion from oral morphine to fentanyl transdermal
patch
4hourly morphine dose 
24hourly morphine dose 
Fentanyl patch size 
520mg 
Up to 135mg 
25mcg/hr 
1535mg 
135224mg 
50 mcg/hr 
4050mg 
225314mg 
75mcg/hr 
5565mg 
315404mg 
100mcg/hr 
7080mg 
405494mg 
125mcg/hr 
8595mg 
495584mg 
150mcg/hr 
100110mg 
585674mg 
175mcg/hr 
115125mg 
675764mg 
200mcg/hr 
130140mg 
765854mg 
225mcg/hr 
145155mg 
855944mg 
250mcg/hr 
160170mg 
9451034mg 
275mcg/hr 
175185mg 
10351124mg 
300mcg/hr 