Plaquenil (Hydroxychloroquine) — Patient-Friendly Medicine Guide (Australia)
Basic Product Information
| International Non-Proprietary Name (INN) | Hydroxychloroquine sulfate |
|---|---|
| Brand Names in Australia | Plaquenil, Hydroxychloroquine Sandoz, Hydroxychloroquine Mylan |
| Anatomical Therapeutic Chemical (ATC) code | P01BA02 |
| Available Forms & Strengths | Film-coated tablets: 200 mg hydroxychloroquine sulfate |
| Typical Manufacturers | Sanofi-Aventis Australia, Sandoz, Mylan |
| Prescription Status | Prescription only (Schedule 4, S4) |
Mechanism of Action
In Simple Terms: Plaquenil reduces inflammation in the body, helping prevent or manage symptoms of certain autoimmune diseases. It changes how the immune system responds, decreasing the process that causes pain, swelling, and damage.
For Specialists: Hydroxychloroquine is an immunomodulatory and antimalarial drug. It increases the pH inside cell structures (lysosomes), interfering with antigen processing, MHC class II antigen presentation, and toll-like receptor signalling. It decreases cytokine production (e.g., IL-1, IL-6, TNF-α), downregulating autoimmune and inflammatory activity.
Pharmacokinetics
- Absorption: Well absorbed from the gastrointestinal tract; peak blood levels in 3–4 hours after oral intake.
- Distribution: Distributed extensively through tissues; crosses the placenta and is detected in breast milk (seek specialist advice in pregnancy or breastfeeding).
- Metabolism: Metabolised in the liver.
- Elimination: Excreted by the kidneys; elimination half-life is about 40–50 days (longer in some individuals).
- Duration of Action: Effects can last weeks after stopping treatment, which is important for management of chronic diseases and monitoring side effects.
Use in Everyday Life and Best Practices (English Context)
Hydroxychloroquine (Plaquenil) is most often prescribed in Australia for autoimmune diseases, especially rheumatoid arthritis, systemic lupus erythematosus (SLE), and juvenile idiopathic arthritis. It may also occasionally be used for certain skin disorders (e.g., discoid lupus, dermatomyositis). It is not an acute painkiller: it works gradually, and improvement may take weeks to months.
- Follow your doctor’s instructions on exact dosing and schedule.
- For long-term management, hydroxychloroquine is often taken as a "background" drug alongside others.
- Continue taking Plaquenil even if you feel well, unless your doctor advises stopping. Stopping suddenly can cause your symptoms to worsen.
- See your rheumatologist or specialist regularly for health checks, especially monitoring vision and eye health.
- Most adults in Australia take one 200mg tablet once or twice daily, as professionally advised.
- Pediatric and elderly dosing is based on weight and medical fitness—see tables below.
Do not exceed recommended doses or self-adjust your medications.
Dosing in the Morning vs Evening: Best Practices
- The medication can be taken in the morning, evening, or split between both times depending on your routine and doctor's advice.
- Advantages of morning dosing: May reduce the risk of stomach upset in sensitive individuals when taken with breakfast; easier to remember as part of morning routines.
- Advantages of evening dosing: Some people find gastrointestinal side effects less bothersome if taken with dinner.
- Tip: Take at the same time every day to maintain consistent drug levels and maximise benefits.
Taking Plaquenil with Food or on an Empty Stomach
- It’s generally recommended to take Plaquenil with a meal or a glass of milk to reduce nausea, heartburn, or stomach upset.
- Bland, non-acidic foods (such as bread, porridge, yoghurt) common in the English diet can be helpful.
- Do not take on an empty stomach unless advised, as this increases the risk of gastrointestinal side effects.
Interaction Warnings
Hydroxychloroquine may interact with a number of common medicines, substances and even foods. Always inform your doctor and pharmacist about all the medicines (including non-prescription and complementary medicines) you are taking.
| Medicine/Food | Interaction Effect | Advice |
|---|---|---|
| Digoxin | Can increase digoxin levels in the blood | Monitor levels, dose adjustment may be needed |
| Antacids (esp. containing magnesium/aluminium) | Reduces absorption of hydroxychloroquine | Take Plaquenil at least 4 hours apart from antacids |
| Methotrexate & other DMARDs | May increase risk of side effects | Close monitoring required |
| Diabetes medicines/insulin | Plaquenil can lower blood sugar further | Monitor blood sugar, may require dose changes |
| Medications prolonging QT interval (e.g., some antibiotics/antipsychotics) | Risk of heart rhythm disturbances | Avoid if possible, ECG monitoring may be needed |
| Alcohol | Increases risk of liver and stomach side effects | Limit or avoid alcohol consumption |
| Grapefruit juice | May interact with liver enzymes | Moderation recommended; monitor if consuming regularly |
Indications
Hydroxychloroquine is approved in Australia for:
- Rheumatoid arthritis (RA)
- Systemic lupus erythematosus (SLE)
- Discoid lupus erythematosus
- Juvenile idiopathic arthritis (under specialist care)
- Certain photosensitive or autoimmune skin disorders
Off-label: Sarcoidosis, cutaneous dermatomyositis, and prophylaxis/treatment of malaria where relevant.
Dosing According to Clinical Indications
| Indication | Adult Dose | Pediatric Dose | Elderly Considerations |
|---|---|---|---|
| Rheumatoid arthritis | 200–400 mg daily, in 1–2 divided doses | 6–6.5 mg/kg (max 400 mg) | Use lowest effective dose; monitor vision closely |
| Systemic lupus erythematosus | 200–400 mg daily | Same as above; specialist dosing | Dose adjustment for kidney/liver function |
| Malaria prophylaxis (rare use) | 400 mg once weekly | 6.5 mg/kg once weekly (max 400 mg) | Monitor interactions with other medications |
Always follow your prescriber’s exact instructions; the above is an informative guide only.
Safety Profile and Side Effects
| Frequency | Possible Side Effects | Advice |
|---|---|---|
| Common (1 in 10–100) | Nausea, diarrhoea, vomiting, loss of appetite, stomach cramps, headache, skin rash, itch, mood changes | Usually mild and may settle; see doctor if persistent |
| Less Common (1 in 100–1,000) | Blurred vision, sensitivity to sunlight, dizziness, muscle weakness | Contact your doctor |
| Rare (1 in 10,000+) | Retinal eye damage, hearing loss, severe skin reactions, heart rhythm disturbances, low blood cell counts, liver problems | Regular eye checks; report any visual changes or serious symptoms promptly |
Warnings: Retinal toxicity (damage to the eye) is a rare but serious risk. Patients should have an eye exam at baseline and then every 12 months if on long-term therapy. Monitoring for blood, heart, and liver effects is also important.
Guidelines for Proper Use (Australia Practice)
- Take exactly as prescribed; do not skip doses.
- Keep a diary, calendar, or phone reminder for your daily dose.
- Have regular blood and eye checks as your doctor recommends (Australian standard: annual or biannual review, with ophthalmology referral as appropriate).
- Tell any health professional prescribing you other medicines that you are taking Plaquenil.
- Discuss any plans for pregnancy or breastfeeding with your specialist.
- Store tablets out of reach of children, in a cool, dry place (below 25°C).
- Dispose of unused medicines at your pharmacy in line with local disposal guidelines.
Alternative Treatment Options and Comparative Overview
| Medicine | Reimbursed (PBS)? | Pros | Cons |
|---|---|---|---|
| Methotrexate | Yes | Highly effective for arthritis, well-studied, PBS subsidised | Not suitable in pregnancy, regular monitoring required |
| Sulfasalazine | Yes | Effective for many, oral form, PBS subsidised | Can cause GI upset/allergies |
| Leflunomide | Yes | Alternative for RA, oral, PBS subsidised | More side effects, not pregnancy safe |
| Biologics (etanercept, adalimumab, etc.) | Yes (for select severe cases) | Highly effective when others fail | Requires injection, costly, more infection risk |
| Non-steroidal anti-inflammatory drugs (NSAIDs) | Yes | Rapid pain relief | Not disease-modifying, GI/cardiac side effects |
Your doctor will recommend the best option for your condition, sometimes using several medicines together.
Legal, Registration, and Reimbursement Status (Australia)
- Registered by the Therapeutic Goods Administration (TGA) for autoimmune diseases and malaria prophylaxis.
- Prescription only (S4) — must be supplied following a current prescription from an Australian registered health practitioner.
- Available on the Pharmaceutical Benefits Scheme (PBS) for listed conditions (e.g., RA, SLE).
- Specialist initiation (e.g., rheumatologist, dermatologist) may be required for PBS subsidies.
- No subsidies for off-label uses unless formally approved.
Latest Research and Clinical Guidance (2022–2025)
- Guidelines published by the Australian Rheumatology Association confirm ongoing benefit in RA and SLE, but recommend lower maximum doses (≤5 mg/kg actual body weight) to reduce long-term eye risks.
(ARA Guidelines, 2024) - Long-term hydroxychloroquine use is associated with reduced flare risk and organ damage in SLE. (University of Oxford, 2022)
- Hydroxychloroquine is not recommended for COVID-19 prevention or treatment except in clinical trials (TGA/Australian Government, 2022).
- Ongoing research continues to evaluate safety and efficacy in paediatric populations and rarer autoimmune conditions.
Availability and Delivery
| Pack Size | Indicative PBS Price (June 2024) | Private Price Estimate | Major City Delivery (Online Pharmacy) |
|---|---|---|---|
| 60 tablets (200 mg each) | $6.70 (PBS co-pay) | $20–45 | Adelaide: 1-2 days; Melbourne: 1-2 days; Sydney: 1-2 days; Brisbane: 2-3 days; Perth: 3-5 days |
| 100 tablets | $6.70 (PBS co-pay, if applicable) | $35–70 | Standard delivery times as above; rural/remote areas please allow longer |
Check with your local pharmacist or PBS Online Directory for latest prices and local availability.
Frequently Asked Questions
- How long will it take before I feel better on Plaquenil?
Most people notice improvement in joint pain or skin symptoms within 6–12 weeks, but full benefits may take up to 6 months. - Can I drink alcohol with Plaquenil?
It is best to limit or avoid alcohol, as it can increase the risk of stomach problems and liver side effects. - Will Plaquenil affect my eyesight?
Plaquenil can rarely cause eye problems; this is why regular eye exams are required. Report any visual changes (e.g., blurring, difficulty reading, eye pain) promptly to your doctor. - Can I take other medicines at the same time as Plaquenil?
Many people do, but hydroxychloroquine interacts with some common medications – always check with your doctor or pharmacist before starting any new medicines. - Is Plaquenil safe during pregnancy or breastfeeding?
Your specialist may recommend ongoing hydroxychloroquine if the benefits outweigh the risks, but it is always given under specialist supervision and after discussion.
This information is a general guide and does not replace advice from your prescriber or Australian pharmacist. Always follow your doctor’s instructions and contact your healthcare professional if you have questions about your treatment.
