Dexone (Dexamethasone): Patient Information Leaflet for Australia
Basic Product Information
| International Non-Proprietary Name (INN) | Dexamethasone |
|---|---|
| Australia Brand Names | Dexone, Maxidex, Decadron, Dexamethasone Sandoz, Dexamethasone DBL |
| ATC Code | H02AB02 |
| Available Forms & Strengths | Tablets (0.5 mg, 4 mg), oral solution, injections (various strengths), eye drops (0.1%) |
| Manufacturers | Alphapharm, Aspen, Sandoz, Hospira, among others |
| Prescription Status | Prescription Only (Schedule 4, PBS-listed for certain indications) |
Mechanism of Action
Dexamethasone is a type of corticosteroid medication, commonly known as a “steroid.” It mimics naturally-occurring hormones produced by your adrenal glands. Dexamethasone works by reducing inflammation, dampening immune system responses, and modifying your body’s reaction to various diseases and stress. For specialists: it acts primarily as a glucocorticoid receptor agonist, inhibiting pro-inflammatory transcription factors and cytokine production.
Pharmacokinetics
- Absorption: Dexamethasone is rapidly absorbed after oral intake, usually reaching peak blood levels within 1–2 hours.
- Distribution: The medicine is distributed widely throughout the body, including the brain and eyes.
- Metabolism: Dexamethasone is mainly metabolised in the liver through CYP3A4 pathways.
- Elimination: The metabolites are excreted mainly in the urine.
- Duration of Action: Dexamethasone has a long-acting profile with effects lasting 36–54 hours, allowing once-daily dosing in many scenarios.
Use in Everyday Life & Best Practices
Dexamethasone is used under medical supervision for a variety of conditions, including managing allergies, skin diseases, severe asthma, certain cancers, autoimmune and inflammatory disorders (such as lupus, rheumatoid arthritis), and as an adjunct in COVID-19 management for some patients.
- Usual adult doses vary greatly depending on the condition (see dosing table below), typically ranging from 0.5–10 mg per day.
- Always take exactly as prescribed by your doctor or pharmacist.
- Do not stop abruptly unless advised, as withdrawal can cause serious effects.
- Advise your prescriber of all other medications you are taking.
Dosing: Morning vs Evening
Most patients are advised to take dexamethasone in the morning to mimic natural cortisol rhythms and reduce the risk of insomnia. Taking your dose at the same time each day helps maintain regular blood levels:
- Morning dosing: Preferred; helps avoid sleep disturbance and may reduce certain side effects.
- Evening dosing: Sometimes required depending on your schedule, but discuss with your doctor first.
- Set reminders or use a pill organiser for consistency.
Taking with Food or on an Empty Stomach
Dexamethasone may upset your stomach if taken alone. To reduce irritation and nausea, it is often best to take with or after a meal (a typical English breakfast or lunch is fine). Avoid carbonated drinks or spicy foods if stomach upset occurs. The absorption is not significantly affected by food, but consistent routines are helpful for minimizing side effects.
Interaction Warnings
Dexamethasone interacts with many foods and medicines. The following table summarises common risks:
| Substance/Type | Interaction | Advice |
|---|---|---|
| Grapefruit juice | May affect metabolism | Avoid regular intake |
| Alcohol | Increased risk of stomach irritation and ulcers | Limit or avoid alcohol |
| NSAIDs (e.g. ibuprofen) | Raised risk of gastric ulcers/bleeding | Use only with physician guidance |
| Vaccines (live) | Reduced immune response; infection risk | Consult your doctor before immunisation |
| Anti-epileptics (phenytoin, carbamazepine) | May lower dexamethasone levels | Dosage adjustments may be needed |
| Antidiabetic medications | Dexamethasone may raise blood sugar | Monitor blood glucose closely |
| Antifungals (ketoconazole, itraconazole) | May increase dexamethasone levels | Physician monitoring required |
Indications
| Official (TGA/PBS-approved) | Off-label (Specialist use) |
|---|---|
|
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Dosing According to Clinical Indications
| Indication | Adults | Paediatric | Elderly |
|---|---|---|---|
| Severe asthma/COPD exacerbation | 4–8 mg daily (tablet or IV) | 0.15–0.6 mg/kg (max 8 mg); single or divided doses | As per adults; monitor for frailty |
| COVID-19 (hospitalised, with oxygen) | 6 mg once daily (oral/IV) for up to 10 days* | 0.15–0.3 mg/kg once daily for up to 10 days | As per adults; assess for risk factors |
| Acute allergic reactions | 4–8 mg as a single dose | 0.6 mg/kg single dose | As per adults |
| Autoimmune disease (e.g. lupus) | 0.5–10 mg daily, long-term | 0.02–0.3 mg/kg/day, tailored | Lowest effective dose advised |
*As per the RECOVERY trial (UK, 2020) and current guidelines.
Safety Profile and Side Effects
Side effects vary with dose, duration, and individual risk factors. Always report unexpected symptoms.
| Common Side Effects | Rare/Serious Effects | Warnings & Monitor |
|---|---|---|
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Guidelines for Proper Use (Pharmacist/Clinic Advice)
- Always follow your doctor’s exact instructions on dose, duration and stopping therapy.
- Carry a “Steroid Card” or note your medication, especially for planned surgery/dental work.
- Have regular check-ups: blood pressure, blood sugar, bone health, and eye exams as recommended.
- Inform your doctor if you develop fever, unusual bruising, persistent sore throat, or vision changes.
- Discuss all new medications or supplements with your pharmacist or GP.
- Take extra care to avoid infections (good hand hygiene, avoid contact with unwell individuals).
- Do not receive live vaccines while on dexamethasone unless approved by your healthcare provider.
Alternative Treatment Options for Listed Indications
- Other corticosteroids: Prednisolone, methylprednisolone, hydrocortisone (different potencies, duration, and side effect profiles).
- For asthma/COPD: Inhaled corticosteroids (fluticasone, budesonide) often preferred for maintenance.
- Non-steroidal immunosuppressants: Methotrexate, mycophenolate, azathioprine (disease-specific).
- Biologics: Examples include Tocilizumab (RA), or Omalizumab (severe asthma) — more targeted, fewer broad side effects.
- Many of these alternatives are listed on the Pharmaceutical Benefits Scheme (PBS) and may be subsidised for certain indications.
Legal, Registration, and Reimbursement Status in Australia
- Dexamethasone (Dexone) is a Schedule 4 prescription medicine in Australia.
- Registered with the Therapeutic Goods Administration (TGA). Product Information and Consumer Medicine Information can be accessed on the TGA website.
- PBS-listed for several Approved Indications (including oncology, autoimmune diseases, acute asthma and COVID-19): attracts a government subsidy.
- Not approved for over-the-counter use; requires a valid prescription from a registered healthcare professional.
- Private prescription may be necessary for some off-label or low-volume uses.
Latest Research & Clinical Guidance (2022–2025)
Recent studies and Australian/UK/NZ/US guidelines (2022–2025) strongly support the use of dexamethasone in reducing mortality in hospitalised COVID-19 patients needing oxygen therapy (Australasian Society for Infectious Diseases, RECOVERY trial). Updated Australian asthma and autoimmune disease guidelines recommend lowest effective dosing for the shortest duration to minimise side effects (NHMRC, RACGP). The use of dexamethasone for antiemesis in cancer, and in severe croup for children, is also strongly supported by current Cochrane reviews and Cancer Council guidance. No significant new safety concerns have emerged, but ongoing vigilance for steroid-related adverse effects is advised.
Availability & Delivery
| Form | Pack Size | Indicative PBS Price (June 2024) | Home Delivery (Metro/Regional) |
|---|---|---|---|
| Tablets | 30, 100 | $6.30 (concession), up to $30 private | Sydney/Melbourne/Brisbane: 1–2 days; Regional: 2–4 days |
| Injection | 1mL, 10mL vials | $10–$40 | Same as above; cold chain for some products |
| Oral Solution | 30mL, 100mL | $15–$45 | Same as above |
| Eye Drops | 5mL, 10mL | From $10 | Same as above |
Large pharmacies and most hospital dispensaries stock this medication. Delivery timing may vary based on location and supply status. Always check with your chosen pharmacy for up-to-date stock information.
Frequently Asked Questions (FAQ)
1. Can I drink alcohol while taking dexamethasone?
Occasional light drinking is unlikely to cause serious issues, but regular or heavy alcohol can increase the risk of stomach irritation and ulcers. It is best to limit or avoid alcohol during your treatment. Consult your doctor if you are unsure.
2. How soon will I notice an improvement in my symptoms?
Some patients notice improvements within hours, particularly for inflammation or breathing problems. For conditions like autoimmune diseases, effects may take several days to a week. Always complete your treatment as directed.
3. What should I do if I forget a dose?
If you miss a dose, take it as soon as you remember. If it is close to the next scheduled dose, skip the missed dose—do not double up. Inform your doctor if you repeatedly miss doses.
4. Can I stop dexamethasone suddenly?
No, do not stop abruptly, especially if you have been on dexamethasone for more than a few days. Gradual withdrawal under medical supervision is essential to prevent withdrawal symptoms or adrenal crisis.
5. Is dexamethasone safe during pregnancy or breastfeeding?
This medication should be used during pregnancy or breastfeeding only if prescribed by your doctor. The risks and benefits will be considered based on your particular circumstances.
This information acts as a guide and does not replace direct medical advice. Always speak with your GP or pharmacist if you have concerns or require further information about dexamethasone. For emergencies, call 000 or visit your nearest hospital in Australia.
