📋 Key Information Summary
- Opioids remain effective for moderate-to-severe acute pain but carry significant risks including respiratory depression, sedation, and dependence even with short courses.
- Start with the lowest effective dose and titrate upward using validated pain scores (NRS 0–10); avoid fixed-dose prescribing without reassessment.
- Respiratory rate (<8 breaths/min), sedation level (Pasero Opioid-Induced Sedation Scale), and oxygen saturation are the three mandatory monitoring parameters in hospital.
- Community opioid prescriptions for acute pain should be limited to the shortest effective duration — typically ≤3 days; re-evaluate before extending.
- Immediate-release formulations are preferred for acute pain; avoid modified-release opioids for acute presentations.
- Multimodal analgesia (paracetamol, NSAIDs, regional techniques) should be the foundation, with opioids added only when non-opioid measures are insufficient.
- Naloxone (Nyxoid® nasal spray) should be co-prescribed or available when opioids are dispensed for community use in patients at elevated overdose risk.
- Patient education at discharge must cover safe storage, disposal (return unused medicines to pharmacy), driving restrictions, and signs of opioid toxicity.
- Patients with renal impairment (eGFR <30 mL/min), hepatic impairment, obstructive sleep apnoea, or BMI >35 require dose reduction and enhanced monitoring.
- Aboriginal and Torres Strait Islander Australians experience higher rates of opioid-related harm; culturally safe education and access to take-home naloxone are critical.
- Codeine is now prescription-only in Australia (since February 2018); CYP2D6 ultra-rapid metabolisers are at particular risk of toxicity from standard codeine doses.
- All opioid prescribing must be documented with indication, dose, duration, exit strategy, and patient consent — in accordance with NSQHS Standards and state opioid policies.
Introduction & Australian Epidemiology
Opioid analgesics — including morphine, oxycodone, tramadol, and codeine — remain indispensable agents for the management of moderate-to-severe acute pain when non-opioid strategies are inadequate. However, their use carries inherent risks of respiratory depression, excessive sedation, nausea, constipation, and the potential for misuse, even after short courses prescribed for legitimate medical indications.
In Australia, opioid-related harm represents a growing public health concern. According to the Australian Institute of Health and Welfare (AIHW), there were approximately 1,750 opioid-induced deaths in 2022, with the majority attributable to pharmaceutical opioids rather than heroin. The Therapeutic Goods Administration (TGA) reports that over 15 million opioid prescriptions are dispensed annually through the Pharmaceutical Benefits Scheme (PBS), with codeine-containing products historically among the most dispensed medications in community practice.
Since February 2018, all codeine-containing products have required a prescription in Australia, following a TGA decision based on evidence of widespread misuse, dependence, and deaths linked to over-the-counter codeine combinations. This regulatory change has shifted community opioid prescribing patterns and highlighted the need for enhanced clinician education around safe prescribing and patient counselling.
This guideline addresses safe opioid use for acute pain across community and hospital settings, covering dose titration, monitoring requirements, patient education, safe storage and disposal, and special population considerations — with particular attention to Aboriginal and Torres Strait Islander health equity.
Community Opioid Use
Community prescribing of opioids for acute pain — typically following surgical procedures, acute musculoskeletal injuries, dental procedures, or renal colic — requires careful consideration of dose, duration, and patient-specific risk factors. The goal is to provide sufficient analgesia for functional recovery while minimising the risk of persistent use and harm.
Prescribing Principles
- Duration: Prescribe the shortest effective course, generally ≤3 days for most acute pain presentations. Beyond 5 days, the risk of ongoing opioid use increases significantly (ref: Shah et al., MMWR, 2017).
- Formulation: Use immediate-release (IR) formulations exclusively for acute pain. Modified-release (MR) and controlled-release (CR) opioids are contraindicated in the acute setting.
- Quantity: Limit dispensed quantity to the anticipated need. For post-procedural pain, 10–15 tablets of an IR opioid with planned review is often sufficient.
- Exit strategy: Document a plan for opioid cessation at the time of prescribing — including a weaning schedule if opioids are expected to be needed for >7 days.
- Multimodal foundation: Prescribe regular paracetamol and/or NSAIDs alongside opioids, with the expectation that opioid dose will decrease as non-opioid analgesia takes effect.
Commonly Prescribed Opioids for Acute Community Pain
Co-Prescribing Naloxone for Community Use
Take-home naloxone (Nyxoid® 1.8 mg nasal spray) should be considered for co-prescription or dispensing alongside opioids in patients with risk factors for overdose. The PBS listing of Nyxoid® in 2022 has improved access significantly.
- History of substance use disorder (including alcohol)
- Concurrent benzodiazepine, gabapentinoid, or sedative use
- Dose ≥50 mg oral morphine equivalents (OME) per day
- History of prior opioid overdose
- Significant respiratory comorbidity (COPD, OSA, obesity hypoventilation)
- Recent release from correctional facilities (loss of tolerance)
Hospital Monitoring
Hospital-based opioid administration for acute pain — whether patient-controlled analgesia (PCA), intravenous bolus, epidural, or oral — requires structured monitoring to detect early signs of ventilatory impairment and excessive sedation. Delayed recognition of respiratory depression is the leading cause of preventable opioid-related death in Australian hospitals.
Mandatory Monitoring Parameters
| Parameter | Frequency | Alert Threshold | Action |
|---|---|---|---|
| Respiratory rate | Every 1 hour for first 24h after IV opioid; every 2h for oral opioids | <8 breaths/min | Hold opioid, stimulate patient, call MET/RRT if RR <6 or unresponsive |
| Sedation level (POSS) | Every 1 hour for IV opioids; every 2h for oral | POSS score ≥3 (very drowsy) | Hold opioid, administer naloxone if unrousable (POSS 4–5) |
| Oxygen saturation (SpO₂) | Continuous for IV PCA/infusions; intermittent for oral | <94% (or <90% in chronic lung disease) | Supplemental O₂, hold opioid, assess ventilation |
| Pain score (NRS 0–10) | Every 4 hours minimum; 30 min post-dose for IV bolus | NRS ≥7 despite maximal non-opioid therapy | Review opioid dose, consider adjuncts, reassess diagnosis |
| Blood pressure | Every 4 hours; continuous for PCA | Systolic <90 mmHg or symptomatic hypotension | Fluid bolus, hold opioid, assess for haemorrhage or sepsis |
Pasero Opioid-Induced Sedation Scale (POSS)
Naloxone Administration in Hospital
High-Risk Patients Requiring Enhanced Monitoring
- Continuous pulse oximetry and closer nursing observation (every 30 min) for patients with BMI >35, OSA, COPD, or heart failure
- Patients aged ≥65 years: start at 50% of standard adult dose, increase monitoring frequency by 50%
- Patients on concurrent benzodiazepines, gabapentinoids (pregabalin, gabapentin), antipsychotics, or sedating antihistamines
- Post-anaesthesia patients: residual anaesthetic effects compound opioid respiratory depression for 24–48 hours
- Patients with renal impairment: active metabolites of morphine (M6G, M3G) accumulate unpredictably
- Consider continuous capnography (end-tidal CO₂ monitoring) for high-risk patients receiving IV PCA
Dose Titration
Appropriate dose titration is the cornerstone of safe opioid prescribing. The principle of "start low, go slow" must be balanced against the need to achieve adequate analgesia — untreated severe pain itself carries physiological consequences including tachycardia, hypertension, hyperglycaemia, immunosuppression, and delayed wound healing.
Oral Opioid Titration (Community and Ward)
Intravenous Opioid Titration (ED / Acute Pain Service)
| Opioid | IV Bolus Titration Dose | Interval Between Doses | Onset | Peak Effect |
|---|---|---|---|---|
| Morphine | 2.5–5 mg IV every 15–20 min | 15–20 min | 5 min | 15–20 min |
| Fentanyl | 25–50 mcg IV every 5–10 min | 5–10 min | 1–2 min | 5–10 min |
| Oxycodone IV | 2–5 mg IV every 10–15 min | 10–15 min | 2–3 min | 10–15 min |
Patient-Controlled Analgesia (PCA)
PCA provides patient-directed titration within safety-guarded parameters. It is preferred over regular intramuscular injections and achieves more consistent analgesia with lower total opioid consumption.
| Parameter | Morphine PCA (standard adult) | Fentanyl PCA (alternative) |
|---|---|---|
| Bolus dose | 1 mg IV | 15–25 mcg IV |
| Lockout interval | 5–8 minutes | 5–8 minutes |
| Maximum dose (1 hour) | 10 mg | 150 mcg |
| Background infusion | Generally NOT recommended (increases respiratory depression risk) | Generally NOT recommended |
| Elderly / renal dose | 0.5 mg bolus, 8 min lockout, max 5 mg/hr | 10 mcg bolus, 8 min lockout |
Opioid Dose Conversion Quick Reference
Patient Education
Patient education is a critical safety intervention at every point of opioid prescribing — at initiation, during use, and at discharge. Evidence from the Australian Commission on Safety and Quality in Health Care (ACSQHC) indicates that structured patient education reduces opioid-related adverse events by up to 30% and decreases the likelihood of persistent opioid use after acute pain episodes.
Key Educational Messages (Discharge Checklist)
Safe Disposal — Return Unwanted Medicines (RUM) Project
The RUM Project, administered by the National Prescribing Service (NPS MedicineWise), provides a free, environmentally safe mechanism for returning unused medicines to community pharmacies across Australia. All Schedule 8 (controlled) medicines, including opioids, should be returned through this programme. Pharmacies are required to accept returned opioids and arrange destruction through appropriate pharmaceutical waste channels.
- Patients should be instructed to return opioids as soon as they are no longer needed — do not stockpile "just in case"
- Returned opioids are weighed and documented; pharmacies must maintain records in compliance with state health department requirements
- Medicines should be returned in their original packaging where possible to facilitate identification
- Patients in rural and remote areas who cannot easily access a pharmacy should contact their local Aboriginal Medical Service, hospital, or community health centre
Documenting the Educational Encounter
In accordance with NSQHS Standard 4 (Medication Safety), the following should be documented in the patient's medical record at each opioid prescribing encounter:
- Indication for opioid use (specific pain diagnosis)
- Opioid name, dose, route, frequency, and planned duration
- Exit strategy — how and when opioids will be ceased or weaned
- Patient (or carer) verbal understanding of key safety messages confirmed
- Take-home naloxone offered/prescribed (if risk criteria met) — document if declined
- Patient's PBS opioid history reviewed (available via My Health Record or state real-time prescription monitoring — SafeScript VIC, SafeScript NSW, QScript QLD, ScriptCheckWA, NT TPOMS)
Special Populations
Paediatrics
Elderly (≥65 Years)
Renal Impairment
Hepatic Impairment
Immunocompromised
Pregnancy & Breastfeeding
Aboriginal and Torres Strait Islander Health Considerations
Aboriginal and Torres Strait Islander Australians experience a disproportionate burden of opioid-related harm, including higher rates of opioid dispensing, opioid-related hospitalisations, and opioid-induced deaths compared to non-Indigenous Australians. The AIHW reports that Indigenous Australians are approximately 1.5 times more likely to be dispensed an opioid and 2 times more likely to die from an opioid overdose than their non-Indigenous counterparts. These disparities are driven by a complex interplay of higher chronic disease burden (particularly musculoskeletal conditions and chronic pain), reduced access to multimodal pain services, socio-economic disadvantage, intergenerational trauma, and systemic barriers to culturally safe healthcare.
📚 References
- 1. Australian Institute of Health and Welfare (AIHW). National Opioid Pharmacotherapy Statistics Annual Data (NOPSAD) report 2023. Canberra: AIHW; 2023. Available from: aihw.gov.au.
- 2. Australian Commission on Safety and Quality in Health Care (ACSQHC). Medication Safety: National Safety and Quality Health Service Standards. 2nd ed. Sydney: ACSQHC; 2021.
- 3. Shah A, Hayes CJ, Martin BC. Characteristics of initial prescription episodes and likelihood of long-term opioid use — United States, 2006–2015. MMWR Morb Mortal Wkly Rep. 2017;66(10):265–269.
- 4. Pasero C, McCaffery M. Pain Assessment and Pharmacologic Management. St Louis: Mosby Elsevier; 2011. (Pasero Opioid-Induced Sedation Scale — POSS).
- 5. Australian and New Zealand College of Anaesthetists and Faculty of Pain Medicine (ANZCA FPM). Acute Pain Management: Scientific Evidence. 5th ed. Melbourne: ANZCA; 2020.
- 6. Therapeutic Goods Administration (TGA). Changes to codeine access — Information for consumers, health professionals and sponsors. Canberra: Department of Health; 2018.
- 7. NPS MedicineWise. Return Unwanted Medicines (RUM) Project. Sydney: NPS MedicineWise; 2024. Available from: returnmed.com.au.
- 8. National Aboriginal Community Controlled Health Organisation (NACCHO). Position Statement: Pain Management and Opioid Use in Aboriginal and Torres Strait Islander Communities. Canberra: NACCHO; 2022.
- 9. Paulozzi LJ, Strickler GK, Kreiner PW, Koris CM. Controlled substance prescribing patterns — Prescription Behavior Surveillance System, eight states, 2013. MMWR Surveill Summ. 2015;64(9):1–14.
- 10. Degenhardt L, Gisev N, Cama E, Nielsen S, Larance B, Bruno R. The extent and correlates of community-based pharmaceutical opioid utilisation in Australia. Pharmacoepidemiol Drug Saf. 2016;25(5):521–538.
- 11. Schug SA, Palmer GM, Scott DA, Halliwell R, Trinca J. Acute pain management: scientific evidence, fourth edition, 2015. Med J Aust. 2016;204(8):315–317. (ANZCA/FPM).
- 12. Royal Australian College of General Practitioners (RACGP). Prescribing drugs of dependence in general practice, Part B — Opioids. Melbourne: RACGP; 2022.
- 13. Larance B, Degenhardt L, Grebely J, et al. Perceptions of extended-release naltrexone, methadone, and buprenorphine treatments for opioid use disorder among people who inject drugs in Australia. Int J Drug Policy. 2020;77:102668.
- 14. Victoria Department of Health. SafeScript: Real-Time Prescription Monitoring Program. Melbourne: Victorian Government; 2023. Available from: health.vic.gov.au/safescript.
- 15. Crabtree A, Rose C, Chai M, et al. Opioid prescribing in a remote Aboriginal community in the Northern Territory: a retrospective audit. Aust J Rural Health. 2021;29(4):543–551.