Mrs Jones is 85 years old and has metastatic colorectal cancer. You see her on a GP home visit and her family explain she is having a lot of side effects from Morphine which is currently being given via a syringe driver. Her daily Morphine requirement is currently 150mg in total and seems to manage her pain. You decide that changing her to subcutaneous Oxycodone may help reduce these side effects.
What dose of subcutaneous Oxycodone over 24 hours should she be prescribed?