Allopurinol: Patient-Friendly Medicine Guide for Australia
Basic Product Information
| International Non-proprietary Name (INN) | Allopurinol |
|---|---|
| Common Australian Brand Names | Zyloprim, Progout, Allosig |
| ATC Code | M04AA01 |
| Available Forms & Strengths | Tablets: 100 mg, 300 mg |
| Manufacturers | Multiple manufacturers registered with the Therapeutic Goods Administration (TGA), including Aspen Pharmacare, Alphapharm, and Sandoz. |
| Prescription Status | Prescription Only Medicine (Schedule 4, S4) |
Mechanism of Action
For Patients: Allopurinol works by reducing the amount of uric acid produced in your body. Too much uric acid can cause health problems like gout (painful, swollen joints) and kidney stones. Allopurinol helps to prevent new attacks and complications but does not treat pain during an acute attack.
For Specialists: Allopurinol is a xanthine oxidase inhibitor, which blocks the conversion of hypoxanthine to xanthine and xanthine to uric acid. By inhibiting xanthine oxidase, allopurinol effectively decreases serum and urinary uric acid concentrations.
Pharmacokinetics
- Absorption: Well absorbed orally (about 80–90%).
- Metabolism: Primarily converted by the liver to oxypurinol, an active metabolite.
- Elimination: Mostly excreted by the kidneys (both allopurinol and oxypurinol).
- Duration of action: Effects last for up to 24 hours; oxypurinol has a longer half-life, contributing to sustained impact.
Use in Everyday Life and Best Practices
Allopurinol is most commonly prescribed for people who experience recurrent gout attacks, have high uric acid levels, or are at risk of certain types of kidney stones. It is also used as part of some cancer treatment plans to prevent uric acid build-up.
- Typical doses: For most adults, treatment starts at a low dose (usually 100 mg daily) and is gradually increased based on uric acid levels and kidney function. Maintenance doses usually range from 100–300 mg daily (can be higher in some cases, up to 600 mg, but this is rare).
- How to use: Take allopurinol once daily, at about the same time each day. Your doctor or pharmacist will advise you about how much to take and if any adjustments are needed for kidney problems.
- Important: Continue taking allopurinol regularly, even if you feel well. Stopping suddenly can cause more attacks.
Dosing in the Morning vs Evening
- Morning dosing may help maintain consistent daily routines, particularly for people taking other morning medicines or who find it easier to remember with breakfast.
- Evening dosing may be advised if you experience side effects such as drowsiness or find it easier due to personal routines.
- Key tip: The most important thing is to take the medicine at the same time each day. Consistency helps keep uric acid controlled.
Taking with Food or on an Empty Stomach
Allopurinol can be taken with or after food to help reduce the risk of stomach upset, which is the most common side effect. There is no significant effect on how the medicine works with or without food. In Australia, since breakfast and dinner are the main meals, patients often prefer to take it with the meal that best fits their routine.
Interaction Warnings
Please tell your healthcare provider about all medicines and supplements you take. Some substances can interact with allopurinol, leading to increased side effects or reduced effectiveness.
| Type | Examples | Advice |
|---|---|---|
| Food | Coffee, tea, high-purine foods (red meats, shellfish), foods high in fructose | Minimise purine-rich foods and sugary drinks; dietary moderation helps the medicine work. |
| Alcohol | Beer, spirits, wine | Alcohol, especially beer, can interfere with uric acid control and increase risk of gout attacks. Limit intake. |
| Medicines | Azathioprine, mercaptopurine, warfarin, ampicillin/amoxicillin, thiazide diuretics, cyclosporin, theophylline | Some medicines can increase risk of side effects or require dose adjustments. Inform your prescriber. |
Indications
| Indication | Status | Notes |
|---|---|---|
| Gout (prevention of recurrent attacks) | Official (TGA approved) | Most common use in Australia |
| Hyperuricaemia associated with chemotherapy | Official | Prevents urate nephropathy in cancer patients |
| Calcium oxalate renal stones (recurrent) | Official | For high uric acid stone formation |
| Other off-label uses | Off-label | Some rare metabolic conditions (see specialist) |
Dosing According to Clinical Indications
| Patient Group | Indication | Initial Dosage | Maintenance Dose | Max Dose | Notes |
|---|---|---|---|---|---|
| Adults | Gout prevention | 100 mg daily | 100–300 mg daily (up to 600 mg in severe cases, rare) | 900 mg/day | Increase slowly; monitor uric acid |
| Children (rare) | Cancer-associated uric acid elevations | 10 mg/kg/day, divided into 3 doses | 10–20 mg/kg/day | 400 mg/day | Pediatric use is specialist only |
| Elderly | Gout prevention | Start at 50–100 mg daily | Adjust based on renal function | Lower max doses recommended | Review kidney function regularly |
| Renal impairment | All | Start very low (e.g., 50 mg every other day) | Careful titration required | According to eGFR | Specialist advice recommended |
Safety Profile & Side Effects
| Frequency | Side Effect | Advice |
|---|---|---|
| Common | Rash, mild nausea, diarrhoea, drowsiness | Usually settle as your body adjusts; inform your doctor if rash or any symptoms persist |
| Occasional | Liver test abnormalities, headache | Blood tests may be recommended; report persistent issues |
| Rare but serious | Severe skin reactions (Stevens–Johnson syndrome), allergic reactions (swelling, breathing difficulty), bone marrow suppression, severe liver problems | Stop taking the medicine and seek urgent medical help if these occur |
Warning: If you develop a skin rash, especially if it is widespread or accompanied by fever, mouth sores, or facial swelling, stop taking allopurinol and seek medical advice immediately.
Guidelines for Proper Use (Pharmacist/Clinic Advice)
- Start allopurinol only when an acute attack of gout has fully settled (unless advised otherwise by your doctor).
- Drink plenty of water, especially in the first weeks of therapy, to reduce the risk of kidney stones.
- Take your medicine regularly, at the same time each day, to maintain stable uric acid levels.
- Inform healthcare providers about all medicines and supplements you are taking, as interactions are possible.
- Have your kidney function and uric acid levels checked regularly, especially when starting therapy or changing the dose.
- Keep your pharmacist or doctor informed if you develop any new symptoms or side effects.
Alternative Treatment Options
- Febuxostat – Also a xanthine oxidase inhibitor; option for those who cannot tolerate allopurinol. More expensive and has some additional cardiac risk warnings.
- Probenecid – Increases uric acid excretion; less commonly used in Australia, particularly if kidney function is reduced.
- Colchicine – Used mainly to prevent gout flares during allopurinol initiation or during acute attacks, not for ongoing uric acid lowering.
- NSAIDs (e.g., indomethacin, naproxen) – Symptom relief only; do not lower uric acid.
- Lifestyle & dietary management – Reducing alcohol (especially beer), weight loss, and dietary modifications play an important role alongside medications.
Legal, Registration, & Reimbursement Status in Australia
| Authority | Status | Details |
|---|---|---|
| Therapeutic Goods Administration (TGA) | Registered Prescription Medicine | Available under Schedule 4 |
| Pharmaceutical Benefits Scheme (PBS) | Reimbursed | Standard patient co-payment applies |
| Legal Requirements | Prescription only | Supplied by licensed pharmacies with a valid Australian prescription |
Latest Research & Clinical Guidance (2022–2025)
Recent Australian guidelines emphasise starting allopurinol at a low dose (e.g., 50–100 mg daily) to minimise risk of side effects and titrating up to achieve and maintain serum urate <0.36 mmol/L (<300 μmol/L) in most patients (RACGP Gout Guidelines 2022). The Australian Prescriber (2024 update) reviewed safety profiles, especially in older and non-English background patients, highlighting the need for regular monitoring in those with kidney impairment. Randomised studies in 2023 confirm that allopurinol is as effective as febuxostat for most patients, but febuxostat may be a better option if allopurinol is not tolerated. Ongoing studies are testing early initiation after an acute attack and combination with colchicine, which may reduce the risk of flare.
Availability and Delivery
| Pack Size | Form & Strength | Indicative PBS Price | Common Delivery Time (Business Days) |
|---|---|---|---|
| 100 tablets | 100 mg | $8.90 (PBS co-payment 2024) | Sydney: 1–2, Melbourne: 1–3, Brisbane: 2–3, Perth: 2–4, Adelaide: 1–3, Hobart: 2–4, Darwin: 3–7 |
| 60 tablets | 300 mg | $8.90 (PBS co-payment 2024) | Sydney: 1–2, Melbourne: 1–3, Brisbane: 2–3, Perth: 2–4, Adelaide: 1–3, Hobart: 2–4, Darwin: 3–7 |
Frequently Asked Questions (FAQ)
- How long will I need to take allopurinol?
For most people with gout or uric acid kidney stones, allopurinol is a long-term treatment to keep uric acid under control and prevent attacks. Do not stop without consulting your doctor. - Is it safe to drink alcohol while taking allopurinol?
Moderate alcohol, especially beer and spirits, can increase your risk of gout attacks. It's best to limit alcohol while taking allopurinol. - Can I take allopurinol at the same time as other medicines?
Many people take other medicines alongside allopurinol. However, some drugs (like azathioprine, mercaptopurine, or certain blood thinners) may interact. Always inform your doctor and pharmacist about all your medicines. - What should I do if I forget a dose?
Take it as soon as you remember, unless it’s almost time for your next dose. Do not double up. Keep dosing consistent for best control. - What should I do if I develop a rash or other bad reaction?
Stop taking the medicine immediately and contact your doctor or nearest emergency department, especially if the rash is widespread or you have fever, mouth sores, or difficulty breathing.
For further information: Consult your doctor, pharmacist, or the NPS MedicineWise website for reliable, up-to-date Australian medication advice.
