Understanding Morphine & Comfort Meds in End-of-Life Care

Many families reach the end of a cancer illness believing one thing. They believe morphine is what finally kills the patient. So some hold doses back. Some give half of what is prescribed. Some refuse to start it until the pain is severe, on the theory that it should be saved. The consequence is not neutral. It is hours or days of pain, breathlessness and agitation. And the treatment for all of it was sitting on the kitchen counter.

Researchers have looked at this repeatedly in hospice and palliative care. They asked whether the opioid dose a dying patient receives predicts how long they live. They found no such relationship. Thorns and Sykes studied it. So did Bercovitch and colleagues, on high-dose morphine in hospice. So did Morita and colleagues, on high-dose opioids and sedatives in terminally ill cancer patients. All point the same way. Neither the size of the dose nor the speed at which it was raised was linked to shorter survival. NCI's patient summary states it without qualification. Studies have shown no link between opioid use and early death.

Opioids can suppress breathing. That fact is real, and it is where the fear comes from. It applies to a large dose given suddenly to someone who has never had one. It does not describe how these drugs are used at the end of life. There, the dose is started low and raised in steps. Each step is checked against the symptom. Tolerance to sedation and to slowed breathing builds faster than tolerance to pain relief. And pain and breathlessness themselves stimulate breathing. So a dose that would be dangerous to an opioid-naive person is unremarkable for someone who reached it gradually. Two cautions are known. One is rapid escalation in someone not yet exposed. The other is combining opioids with benzodiazepines without care. That is precisely why teams titrate rather than guess.

Low-dose opioids reduce the sensation of breathlessness. That is one of their main uses in the last days. Families sometimes see morphine given to someone with no obvious pain, and conclude it must be for something else. It is for air hunger. And it works.

Doses are increased when someone is deteriorating. Deterioration is followed by death. So a dose sits close to the moment of death for nearly everyone who dies with symptoms controlled. It is easy to read that as cause. But look at the other changes in the same window. Irregular breathing. Mottled skin. Unresponsiveness. That is the illness advancing on its own timetable.

People taking regular opioids become physically dependent. That means the drug cannot be stopped abruptly. It is not the same as addiction, which is compulsive use despite harm. A person in the last weeks of a cancer illness is not going to develop a drug problem. Withholding relief to prevent one has no rationale.

Clinicians work within a clear framework. A medicine given to relieve suffering, at a dose proportionate to the symptom, is appropriate. That holds even if drowsiness is a foreseeable effect. Two things distinguish symptom control from anything else: the intention, and the dose. Both are documented in the notes.

Write down every dose and the time. Note what the symptom was before and after. Ask for a written plan. It should cover the regular dose, the breakthrough dose, the maximum frequency, and what to do if a dose does not work within half an hour. Follow the written plan exactly as it is worded, and do not skip a scheduled dose because the person looks settled. The settled state is what the dose is producing. There is one situation that overrides this: if the person cannot be roused, their breathing has turned very slow or gappy, or the instruction in front of you is unclear, ring the hospice line before you give anything and describe what you are seeing. And if you are frightened of the medicine, say so to the nurse directly. Do not quietly give less.

Comfort medicines have their own warning signs. Reporting one is not the same as asking for the dose to be cut back.

• Call your care team or the hospice 24-hour line the same day if breathing turns very slow or develops long pauses, the person cannot be roused at all between doses, new confusion, hallucinations or severe muscle stiffness appear, or a breakthrough dose has not touched the pain after about half an hour. MedlinePlus lists slowed breathing, long pauses between breaths and extreme drowsiness among the reasons to contact a doctor at once.
• Call your care team within a day or two if the regular dose stops holding and pain, restlessness or air hunger returns before the next one is due, or if drowsiness after a recent increase has not eased after a day or two.

• NCI PDQ, Last Days of Life (patient version): opioids and pain control
• NCI PDQ, Last Days of Life (health professional version): opioid dose and survival evidence
• Last Days of Life (PDQ) full text, NCBI Bookshelf
• MedlinePlus, Morphine: side effects to report to a doctor at once