Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Life-threatening opioid effect
Unrousable sedation, cyanosis, respiratory rate below 8 per minute or clinically important hypoventilation after opioid initiation or titration is an emergency.
Action: Stop further opioid, call emergency or resuscitation help, support airway and ventilation and give oxygen when indicated. Use titrated naloxone according to the emergency and local protocol when respiratory depression is clinically significant, recognising that repeated dosing or infusion may be needed because naloxone can wear off first.
Synopsis
Start a strong opioid only after mechanism and safety assessment, prescribe maintenance, breakthrough and adverse-effect prevention coherently, titrate to a functional goal, and detect toxicity or organ-clearance change before harm occurs.
Confirm that pain is opioid responsive, moderate to severe and persistent enough to justify a strong opioid; address emergency and non-opioid mechanisms first.
First-line in advanced progressive disease is usually oral morphine when the oral route is reliable and renal and hepatic function are suitable.
NICE describes 20 to 30 mg total daily sustained-release oral morphine plus 5 mg immediate-release rescue during initial titration for a typical opioid-naive adult; use lower individual doses in frailty.
Key red flags
New severe pain with neurological deficit, fracture, sepsis or obstruction needs cause-specific emergency management before routine titration.
Neurotoxicity
New hallucination, cognitive fluctuation, myoclonus, hyperalgesia or excessive somnolence signals accumulation or interaction and blocks routine titration.
Investigation priorities
01
First-line opioid readiness assessmentFirst stepFirst line
Confirm mechanism, severity, goal, current opioid exposure, oral reliability, organ function, cognition, sedatives and administration support.
Management branches
Opioid-naive startInitiate oral morphine safely
Moderate-to-severe persistent pain is opioid responsive and oral morphine is suitable after assessment.
Explain goals and risks, establish baseline cognition, breathing, bowel function and renal or hepatic status and remove duplicate opioid prescriptions.
Use the NICE and local starting regimen adjusted for frailty, prescribe immediate-release rescue and laxative, and document nausea, driving, storage and emergency advice.
Key medicines
Sustained-release oral morphine maintenanceNICE describes 20 to 30 mg total daily in divided sustained-release oral doses for a typical opioid-naive adult with advanced progressive disease, together with immediate-release rescue; start lower when frailty or sensitivity warrants and do not apply this regimen in significant renal impairment without expert advice.
Immediate-release oral morphine rescueDuring initial titration NICE describes 5 mg oral immediate-release morphine as the rescue dose; later dosing must be recalculated from the current total daily opioid and verified under the local palliative formulary.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.