Canterbury DHB


Methylnaltrexone Information Sheet

Download a printable version of the Methylnaltrexone Information Sheet.

12 mg/0.6 mL solution for injection

Practice points

Mechanism of action


Patient weight (kg)

Injection volume


38 to less than 62

0.4 mL

8 mg

62 to 114

0.6 mL

12 mg

Less than 38 or more than 114

0.0075 mL/kg (rounded to nearest 0.1 mL)

0.15 mg/kg (rounded to nearest 2 mg)




Adverse reactions

Special Authority requirements

The patient is receiving palliative care AND:

Advice and support

Within working hours contact the Christchurch Hospital Palliative Care Service on (03) 364 1473, or the Nurse Maude Hospice on (03) 375 4274.

After hours contact the Christchurch Hospital operator on (03) 364 0640 and ask for the palliative care clinician on call.

About this Canterbury DHB document (951856):

Document Owner:

Kate Grundy (see Who's Who)

Last Reviewed:

December 2021

Next Review:

December 2023


Note: Only the electronic version is controlled. Once printed, this is no longer a controlled document. Disclaimer

Topic Code: 951856