This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Relative potencies of morphine via various routes

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The relative potency of morphine when given by various routes is given below:


Potency relative to oral morphine

oral morphine


rectal morphine


subcutaneous morphine


intravenous morphine


subcutaneous diamorphine


i.e. 3mg oral morphine is equivalent to 1mg of subcutaneous diamorphine

Check summary of product characteristics before prescribing any drugs mentioned.


  1. West Midlands Palliative Care Physicians (2003). Palliative care - guidelines for the use of drugs in symptom control.



Related pages

Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.