Management of Pain and End-of-Life Care with Morphine

Initial Dosing in Opioid-Naive Patients

For adult patients without prior exposure to opioids in end-of-life care, start with intravenous boluses of 2 mg of morphine every 15 minutes as needed, followed by a continuous infusion if two boluses are required within an hour, doubling the infusion rate at that time, as recommended by the European Society of Intensive Care Medicine 1
The American College of Critical Care Medicine suggests an initial standard dose of 2 mg IV of morphine (or equianalgesic dose of another opioid) for pain management 1
For severe pain, the National Comprehensive Cancer Network recommends 2-5 mg IV of morphine for patients requiring urgent relief 2
The initial dose should be adjusted based on the patient's body size, age, and organic dysfunction, according to the European Society of Intensive Care Medicine 1

If the patient receives two bolus doses within an hour, it is reasonable to double the infusion rate, as suggested by the European Society of Intensive Care Medicine 1
For pain or respiratory distress, treat with an IV bolus followed by a continuous infusion of opioid, as recommended by the European Society of Intensive Care Medicine 1

If the patient is already comfortable with a stable dose of opioid and/or sedative, continue with those doses during the withdrawal of life-sustaining measures, as recommended by the European Society of Intensive Care Medicine 1
There is no specified dose limit during the withdrawal of life-sustaining measures; opioids should be titrated according to symptoms, according to the European Society of Intensive Care Medicine 1

The parenteral (IV or subcutaneous) morphine is approximately 3 times more potent than oral morphine, as stated by the National Comprehensive Cancer Network 2
If administered parenterally, the equivalent dose is one-third of the oral dose, according to the National Comprehensive Cancer Network 2
For example, 15 mg of oral morphine is approximately equivalent to 5 mg of IV morphine, as recommended by the National Comprehensive Cancer Network 2

First, treat pain and dyspnea with opioids, as recommended by the European Society of Intensive Care Medicine 1
Second, use sedatives only after pain and dyspnea are effectively treated with opioids, according to the European Society of Intensive Care Medicine 1
Agents should be used to treat symptoms and also to prevent symptoms when they can be anticipated but are not yet apparent, as suggested by the European Society of Intensive Care Medicine 1

Use morphine with caution in patients with fluctuating renal function due to the potential accumulation of active metabolites (morphine-6-glucuronide) that can cause neurotoxicity, as recommended by the National Comprehensive Cancer Network 2
Order antiemetics PRN with opioids, as suggested by the European Society of Intensive Care Medicine 1

Morphine is the initial opioid of choice for pain or dyspnea during the withdrawal of life-sustaining measures in patients without prior exposure to opioids, as recommended by the European Society of Intensive Care Medicine 1
Pure agonists with a short half-life (morphine, hydromorphone, fentanyl, oxycodone) are preferred because they can be titrated more easily than opioids with a long half-life (methadone and levorphanol), according to the National Comprehensive Cancer Network 2