Converting between Morphine and Diamorphine

Converting between Morphine and Diamorphine

Approximate equivalent doses of oral morphine and subcutaneous morphine and subcutaneous diamorphine:-
3mg oral morphine = 1.5mg SC morphine = 1mg SC diamorphine

These conversion ratios apply to PRN and regular dosing.

  • e.g. (1)

60mg MST BD PO

= Total Daily Dose oral morphine 120mg PO

= 60mg SC morphine/24 hrs

= 40mg SC diamorphine/24 hrs

  • e.g. (2)

30mg Oramorph PO PRN

= 15mg SC morphine PRN

= 10mg SC diamorphine PRN

Morphine preparations:

 

See table on Morphine page