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Morphine

Classification

high alert medication

controlled and targeted substance

Opioid analgesic

Indications

PCP: Pain management in palliative or end-of-life emergencies

ACP: Analgesia

ACP: Symptom relief in palliative or end-of-life patients with pain or shortness of breath

Contraindications

Known hypersensitivity to morphine or other opioid analgesics
Head injury with altered LOC (GCS < 9)
Hypotension (adult SBP < 90 mmHg; children under 12 SBP < 70 mmHg)
Respiratory depression (adults < 10 breaths/minute; children under 12 < 20 breaths/minute)

Cautions

Convulsive disorderes
Cranial injuries
Respiratory insufficiency, including asthma, COPD, and upper airway obstruction
Cardiac arrhythmias
Reduced blood volume (hypovolemia)

Adult dosages

Dosing for Morphine is based on opioid-naive patients. For patients identified as not opioid-naive, consider consultation with CliniCall for additional analgesia planning support.

PCP: Pain management in palliative emergencies or end-of-life patients

☎️ Mandatory CliniCall or palliative team consultation to discuss dosing strategies
Subcutaneous
- 2.5 mg - 5 mg every 10-30 minutes, as required, based on blood pressure (SBP > 100 mmHg), or as per CliniCall or palliative team care plan
- Maximum cumulative dose 20 mg

ACP: Symptom relief in palliative or end-of-life patients with pain or shortness of breath

☎️ Mandatory CliniCall or palliative team consultation to discuss dosing strategies
Subcutaneous
- 2.5 mg - 5 mg
- May repeat every 10-30 minutes as required based on blood pressure (SBP > 100 mmHg) or as per CliniCall or palliative team care plan
ACP: Analgesia
- Intravenous
  - 2.5 mg - 5 mg q 5-10 minutes prn
  - Consider for use in longer transport times

Pediatric Considerations And Dosing

ACP:

Intravenous
- See Page for Age for weight based dosing
- Administer one dose initially (0.05 mg/kg). May repeat after 5 minute interval as required for pain control. The dose, up to a cumulative 0.1 mg/kg, can be repeated after two hours.

How Supplied

Ampoule: 10 mg in 1 mL ampoule

Mechanism Of Action

Binds to opioid receptors in the CNS (primarily mu receptors) causing inhibition of ascending pain pathways, altering the perception of and response to pain and producing generalized CNS depression.

Pharmacokinetics

Intramuscular / subcutaneous:

Onset: 10 minutes
Peak: 20-60 minutes (variable)
Duration: 2-4 hours

Intravenous:

Onset: 5-10 minutes
Peak: 20 minutes
Duration: 2-4 hours

Adverse Effects

Drowsiness, dizziness, sedation, agitation, euphoria
Respiratory depression and apnea
Profound hypotension (may be increased with rapid IV injection), bradycardia
Nausea, vomiting, constipation
Pinpoint pupils
Repeated subcutaneous administration may cause local tissue irritation
Pseudoallergic reactions (itch, rash) may occur due to direct stimulation of histamine release (anaphylaxis is rare)

Overdose

Provide airway management and ventilatory support. Consider the use of naloxone to reverse opioid intoxication. Naloxone should be used judiciously in patients on long-term opioid therapy to avoid precipitating acute withdrawal syndrome.

See Naloxone guideline.

Drug Interactions

Morphine may enhance respiratory and circulatory depression if used in combination with other opioids, sedatives such as benzodiazepines, phenothiazines, anesthetics, or alcohol.

Do not use morphine in patients taking monoamine oxidase inhibitors (MAOIs) or within 14 days of MAOI discontinuation.