📋 Key Information Summary
- Anticipatory prescribing is the proactive preparation of injectable medications and equipment for predictable end-of-life symptoms, reducing crisis-driven interventions and unplanned hospital transfers.
- Initiate anticipatory prescribing when a patient is identified as being in the last days to weeks of life, ideally before symptoms escalate.
- Morphine (immediate-release oral solution or SC injection) is the first-line agent for both pain and respiratory distress/dyspnoea at end of life; typical SC bolus 2.5–5 mg 2-hourly PRN.
- Midazolam (SC) is the first-line benzodiazepine for terminal restlessness, agitation, and seizures; typical dose 2.5–5 mg SC bolus, with subcutaneous infusion (syringe driver) 10–30 mg over 24 hours if symptoms are refractory.
- Clonazepam (oral/sublingual) is useful for myoclonus and anticipatory anxiety; 0.5–1 mg BD/TDS.
- Haloperidol (SC/PO) is first-line for nausea and vomiting of central origin and delirium with agitation; typical dose 0.5–2.5 mg SC/PO BD/TDS.
- Metoclopramide (SC/PO) is preferred for nausea from gastric stasis and visceral distension; 10 mg SC/PO TDS-QDS; contraindicated in bowel obstruction.
- Hyoscine butylbromide (Buscopan®) 20 mg SC and glycopyrrolate 0.2 mg SC are first-line anticholinergics for death rattle (excessive respiratory secretions).
- Always prepare a syringe driver (e.g., McKinley T34™ or CADD-Solis®) when continuous symptom control is required; standard diluents and compatibility charts must guide mixing.
- All anticipated medications should be kept in the patient's home or residential aged-care facility with clear written instructions and a 24-hour contact number for the palliative care team.
- Renal and hepatic impairment significantly alter opioid and benzodiazepine clearance — reduce doses and extend intervals accordingly.
- Aboriginal and Torres Strait Islander communities require culturally safe end-of-life conversations, community-controlled health service involvement, and awareness of geographical barriers to medication access.
Introduction & Australian Epidemiology
Anticipatory prescribing is a cornerstone of high-quality palliative care. It involves the proactive ordering, supply, and home storage of injectable medications before symptoms become acute, so that carers and clinicians can respond rapidly to predictable complications such as pain escalation, respiratory distress, nausea, agitation, and excessive secretions.
In Australia, approximately 160,000 people die each year, with the majority being older adults with chronic, life-limiting illnesses. The Australian Institute of Health and Welfare (AIHW) reports that over 70% of Australians express a preference to die at home or in a community setting, yet only around 15% of deaths currently occur at home. One of the key modifiable barriers to achieving a home death is the lack of timely access to injectable medications after hours — a gap that anticipatory prescribing directly addresses.
The National Consensus Statement: Essential Elements for Safe and High-Quality End-of-Life Care (ACSQHC) identifies anticipatory prescribing as an essential element of safe end-of-life care. Palliative Care Australia's National Palliative Care Standards (5th edition) similarly endorse proactive symptom planning as a core standard. State and territory ambulance services, residential aged-care facilities, and hospital-in-the-home programmes across Australia increasingly mandate anticipatory prescribing pathways.
This article covers the four principal drug classes used in anticipatory prescribing for adults in Australia: opioids (morphine), benzodiazepines (midazolam, clonazepam), antiemetics/antipsychotics (haloperidol, metoclopramide), and anticholinergics (hyoscine butylbromide, glycopyrrolate). Practical guidance on syringe drivers, equipment, monitoring, special populations, and Aboriginal and Torres Strait Islander considerations is included.
Anticipatory Prescribing Principles
Anticipatory prescribing should follow a structured approach to ensure safe, timely, and effective symptom management at end of life.
Standard Anticipatory Prescribing Kit — Quick Reference
Morphine
Morphine is the most widely used opioid in Australian palliative care and remains the gold-standard agent for both nociceptive pain and respiratory distress/dyspnoea at end of life. Its well-characterised pharmacology, multiple formulations, and familiar dose-conversion ratios make it the default first-line choice in anticipatory prescribing kits.
Pharmacology
Morphine is a μ-opioid receptor agonist. It undergoes hepatic glucuronidation to morphine-3-glucuronide (M3G — neuroexcitatory, potentially causing myoclonus and hyperalgesia) and morphine-6-glucuronide (M6G — analgesic, accumulates in renal impairment). Both active metabolites are renally excreted, mandating dose reduction in chronic kidney disease.
Indications at End of Life
- Pain: Visceral, somatic, and neuropathic pain (as adjuvant). Starting dose depends on prior opioid exposure.
- Dyspnoea: Low-dose morphine reduces the central respiratory drive and the sensation of breathlessness. Evidence from randomised trials and systematic reviews supports its use in end-stage COPD, heart failure, and cancer-related dyspnoea.
Available Formulations
| Formulation | Product (Australia) | Use | PBS Status |
|---|---|---|---|
| Immediate-release oral solution | Ordine® 2 mg/mL, 5 mg/mL, 10 mg/mL; Sevre-Duo® | Breakthrough pain, dyspnoea; can be given sublingually if swallowing difficult | ✔ PBS General Benefit |
| Subcutaneous injection | DBL Morphine Sulphate 10 mg/mL, 15 mg/mL, 20 mg/mL, 30 mg/mL ampoules | Parenteral breakthrough pain and dyspnoea; syringe driver infusion | Restricted Benefit — Palliative Care |
| Sustained-release oral | Kapanol®, MS Contin®, Morphgesic SR® | Background pain (not typically in acute anticipatory kit) | ✔ PBS General Benefit |
Oral-to-Parenteral Conversion
The standard oral-to-subcutaneous conversion ratio for morphine in Australian palliative care practice is approximately 2:1 to 3:1 (i.e., 2–3 mg oral morphine ≈ 1 mg SC morphine). When converting from sustained-release to subcutaneous, calculate the total 24-hour oral dose first, then divide by the conversion factor.
Side Effects and Management
- Nausea: Common on initiation. Co-prescribe haloperidol or metoclopramide (see below).
- Constipation: Continue regular laxatives (e.g., macrogol, senna, or lactulose) until the last days of life when oral intake ceases.
- Sedation: Usually precedes respiratory depression. Assess using the Richmond Agitation–Sedation Scale (RASS). If RASS ≤ −3, hold next dose and review.
- Myoclonus: May indicate metabolite accumulation (especially in renal impairment) or high-dose opioid use. Switch opioid or add midazolam/clonazepam.
- Respiratory depression: Rare at appropriate palliative doses. If respiratory rate <8/min with excessive sedation, withhold opioid and consider naloxone 40–200 mcg IV/SC diluted — titrate cautiously to avoid precipitating acute withdrawal and pain crisis.
Midazolam & Clonazepam
Benzodiazepines are essential in the anticipatory prescribing kit for managing terminal restlessness and agitation, anxiety, myoclonus, and seizures at end of life. Midazolam is the preferred parenteral agent due to its rapid onset and short duration of action when given as intermittent boluses, while clonazepam offers a longer-acting oral option.
Midazolam
Midazolam is a short-acting benzodiazepine with an onset of 1–3 minutes (SC) and duration of 2–4 hours for bolus doses. It is the first-line agent for acute terminal agitation and is also effective for seizure management at end of life.
Clonazepam
Clonazepam has a longer duration of action (6–12 hours) and is particularly useful for myoclonus associated with high-dose opioid use and for persistent anxiety between midazolam doses. It can be given orally or sublingually.
Syringe Driver — Midazolam Infusion
When intermittent SC boluses of midazolam fail to control agitation within 24 hours, convert to a continuous subcutaneous infusion via syringe driver. Calculate the total bolus dose required in the preceding 24 hours and use this as the starting infusion dose. Typical range is 10–30 mg/24 hours, but higher doses (up to 60–100 mg/24 h) may be needed in refractory terminal agitation — always consult specialist palliative care before exceeding 30 mg/24 h.
Haloperidol & Metoclopramide
Nausea and vomiting are among the most distressing symptoms at end of life, affecting up to 70% of patients with advanced cancer and a significant proportion of patients with end-stage organ failure. Delirium with agitation also affects 28–83% of patients in the last days of life. Haloperidol and metoclopramide are the principal antiemetic agents in the anticipatory prescribing kit, each targeting different mechanisms of nausea.
Haloperidol
Haloperidol is a butyrophenone antipsychotic that acts primarily as a dopamine D₂ antagonist in the chemoreceptor trigger zone (CTZ). It is the first-line antiemetic for nausea of central origin (metabolic, drug-induced, raised intracranial pressure) and is also effective for managing delirium with agitation at end of life. Low doses are effective and extrapyramidal side effects are uncommon in the palliative care context at typical doses.
Metoclopramide
Metoclopramide is a dopamine D₂ antagonist and 5-HT₄ agonist with prokinetic activity. It is preferred for nausea caused by gastric stasis, opioid-induced nausea (via enhanced gastric motility), and hepatic capsular distension. It is contraindicated in mechanical bowel obstruction as it increases gastrointestinal motility.
Choosing Between Haloperidol and Metoclopramide
| Nausea Mechanism | Preferred Agent | Clinical Scenario |
|---|---|---|
| Central (CTZ/metabolic) | Haloperidol | Drug-induced (e.g., opioids, antibiotics), uraemia, hypercalcaemia |
| Gastric stasis | Metoclopramide | Opioid-induced delayed gastric emptying, gastroparesis, hepatic capsular distension |
| Bowel obstruction | Haloperidol (± cyclizine) | Avoid metoclopramide; add octreotide for secretion control |
| Vestibular / positional | Cyclizine (alternative) | Cerebral metastases, raised ICP |
| Delirium with agitation | Haloperidol | End-of-life delirium — combined antiemetic and antipsychotic effect |
Anticholinergics (Hyoscine Butylbromide & Glycopyrrolate)
Anticholinergic (antimuscarinic) medications are used in the anticipatory kit primarily for the management of death rattle — the noisy, rattling respiratory secretions caused by pooled oropharyngeal and bronchial secretions in the dying patient who can no longer cough or swallow effectively. This sound can be profoundly distressing to family members and carers, although evidence suggests the dying patient is unlikely to be aware of it.
Mechanism
Anticholinergic agents block muscarinic (M₃) receptors on submucosal glands in the airways and oropharynx, reducing the volume of secretions produced. They do not clear existing secretions but prevent further accumulation.
First-Line: Hyoscine Butylbromide (Buscopan®)
Hyoscine butylbromide is a quaternary ammonium antimuscarinic that does not cross the blood-brain barrier significantly, making it preferred over hyoscine hydrobromide as it causes less central sedation and confusion. It is widely available in Australia and is the standard first-line agent for death rattle.
Second-Line: Glycopyrrolate (Glycopyrronium)
Glycopyrrolate is a quaternary ammonium antimuscarinic with similar peripheral selectivity to hyoscine butylbromide. It causes less sedation and may have a slightly longer duration of action. It is available in Australia but less commonly stocked in community pharmacies than hyoscine butylbromide.
Alternative: Hyoscine Hydrobromide
Hyoscine hydrobromide (scopolamine) crosses the blood-brain barrier and can cause sedation, confusion, and hallucinations. It is generally reserved as a second- or third-line option for death rattle. However, the sedating effect may be desirable if concurrent terminal agitation is present. Dose: 0.4 mg (400 mcg) SC 4–6 hourly PRN or 1.2 mg over 24 hours via syringe driver.
Other Indications for Anticholinergics at End of Life
- Colicky abdominal pain: Hyoscine butylbromide 20 mg SC 4–6 hourly for bowel colic or ureteric colic when active management is not appropriate.
- Sweating: Hyoscine butylbromide or glycopyrrolate can reduce troublesome sweating in the dying phase.
- Sialorrhoea: Glycopyrrolate is preferred for excessive salivation (e.g., in motor neurone disease or post-stroke), particularly as it causes less central sedation.
Syringe Drivers & Practical Equipment
A subcutaneous infusion pump (syringe driver) is indicated when a patient requires continuous symptom control that cannot be adequately managed with intermittent bolus injections, or when the patient can no longer take oral medications. Common indications include continuous opioid infusion for background pain, continuous midazolam for refractory agitation, and combination infusions for multiple concurrent symptoms.
Common Syringe Driver Devices in Australia
| Device | Syringe Size | Key Features |
|---|---|---|
| McKinley T34™ | 20 mL or 50 mL | Most commonly used in Australian community palliative care; programmable rate; bolus dose capability; lightweight |
| CADD-Solis® VIP | Various | Multiple infusion modes; PCA capability; used in hospital and specialist palliative care units |
| BD Alaris™ | Various | Hospital-based syringe pump; used in inpatient palliative care units |
Syringe Driver Drug Compatibility
The following combinations are commonly used in a single syringe driver with 0.9% sodium chloride or water for injections as diluent. Always verify against the most current compatibility data.
| Drug Combination | Compatible | Notes |
|---|---|---|
| Morphine + Midazolam | ✔ Yes | Most common dual combination for pain + agitation |
| Morphine + Haloperidol | ✔ Yes | Pain + nausea |
| Morphine + Haloperidol + Hyoscine butylbromide | ✔ Yes | Triple combination — pain + nausea + secretions |
| Morphine + Midazolam + Haloperidol + Hyoscine butylbromide | ✔ Yes | Quadruple combination — all four drug classes; total volume should not exceed syringe capacity |
| Morphine + Metoclopramide | ✔ Yes | Pain + gastric stasis-related nausea |
| Haloperidol + Metoclopramide | ✔ Yes | Dual antiemetic approach |
| Midazolam + Hyoscine butylbromide | ✔ Yes | Agitation + secretions (no opioid required) |
Essential Equipment Checklist
- Subcutaneous butterfly/Scalp Vein needles — 23G or 25G
- Syringes (1 mL, 3 mL, 5 mL, 10 mL)
- 0.9% sodium chloride ampoules (for dilution)
- Water for injections ampoules
- Sharps container
- Alcohol swabs
- Adhesive dressing (for SC site fixation)
- Syringe driver + batteries (if home-based driver anticipated)
- Written medication action plan with dose instructions
- 24-hour contact number for palliative care team
Monitoring & Safety
Monitoring at end of life is focused on symptom response and safety rather than routine biochemistry. The goal is to achieve adequate symptom relief while minimising adverse effects, maintaining the patient's comfort and dignity.
Key Monitoring Parameters
Special Populations
Aboriginal and Torres Strait Islander Health Considerations
📚 References
- 1. Palliative Care Australia. National Palliative Care Standards. 5th ed. Canberra: Palliative Care Australia; 2018.
- 2. Australian Commission on Safety and Quality in Health Care (ACSQHC). National Consensus Statement: Essential Elements for Safe and High-Quality End-of-Life Care. Sydney: ACSQHC; 2015.
- 3. Australian Government Department of Health and Aged Care. National Palliative Care Strategy 2018. Canberra: Commonwealth of Australia; 2018.
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- 8. Wee B, Hillier R. Interventions for noisy breathing in patients near to death. Cochrane Database Syst Rev. 2008;(1):CD005177.
- 9. Australian Institute of Health and Welfare (AIHW). Palliative care services in Australia. Cat. no. HWV 78. Canberra: AIHW; 2023.
- 10. Royal Australian College of General Practitioners (RACGP). Specific Interests: Palliative Care. Melbourne: RACGP; 2023.
- 11. World Health Organization (WHO). WHO Guidelines for the Pharmacological and Radiotherapeutic Management of Cancer Pain in Adults and Adolescents. Geneva: WHO; 2018.
- 12. Aboriginal and Torres Strait Islander Health Performance Framework. Measure 3.09: Access to palliative care. Australian Government; 2023.
- 13. To THM, Agar M, Shelby-James T, et al. Prescribing for end-of-life care in the Australian aged care setting: a prospective audit. Intern Med J. 2013;43(10):1138–1143.
- 14. National Institute for Health and Care Excellence (NICE). End of life care for adults: service delivery. NICE guideline [NG142]. London: NICE; 2019.