Morphine Administration Guidelines

Introduction to Morphine Formulations

The British Medical Journal recommends that controlled release morphine tablets should not be crushed or used for rectal or vaginal administration, as this can destroy the extended-release mechanism and lead to dose dumping 1, 2
Morphine is available in two main oral formulations: immediate release (for dose titration) and controlled/modified release (for maintenance treatment), with the optimal route of administration being by mouth 1, 3
The optimal route of administration for morphine is by mouth, which is the simplest and most acceptable to patients, with alternative routes including rectal and subcutaneous administration 1, 3, 4

The British Medical Journal suggests that if patients are unable to take drugs orally, the preferred alternative routes are rectal and subcutaneous, with rectal administration having the same potency ratio as oral 1, 2
Subcutaneous administration can be considered for patients requiring alternative administration routes, with bolus injections every four hours or continuous infusion 1, 5

The British Medical Journal advises to never crush controlled/modified release formulations, as this can lead to rapid release of the full dose, potentially causing respiratory depression, overdose, and death 1, 2
For patients unable to take oral medications, consideration should be given to changing to an appropriate alternative formulation or route rather than crushing, to maintain the extended-release properties and bioavailability 1, 5