Arava (Leflunomide) – Patient-Friendly Guide (UK)
Arava is a prescription medicine containing leflunomide, used to treat certain immune-mediated inflammatory conditions, particularly rheumatoid arthritis and some forms of psoriatic arthritis. It works by helping to calm an overactive immune response, which can reduce pain, swelling, and disease activity over time.
This guide explains how Arava works, when it is usually taken, what to expect, key safety considerations, and practical tips to help you use the medicine effectively. It also outlines important interactions, including alcohol and other medicines.
Quick product information
| Information | Details |
|---|---|
| Active ingredient | Leflunomide |
| Brand name | Arava |
| Medicine type | Disease-modifying anti-rheumatic drug (DMARD) |
| Common uses | Rheumatoid arthritis (RA); psoriatic arthritis (PsA) in selected cases |
| How it’s taken | Oral tablets once daily (regimen varies by prescriber and condition) |
| Typical onset | Some improvement may be seen in weeks; full benefit can take months |
| Major safety focus | Liver health, blood counts, infection risk, and pregnancy avoidance |
How Arava works (mechanism of action)
Leflunomide is a DMARD that helps reduce joint inflammation and immune activation. After you take it by mouth, it is converted in the body to an active metabolite (primarily teriflunomide).
Teriflunomide works mainly by interfering with the immune system’s ability to make certain building blocks (pyrimidines) required for T-lymphocyte activity. In practical terms, it helps slow down an overactive immune response that drives inflammation in conditions like rheumatoid arthritis.
- Helps reduce inflammation: lowers swelling and pain in affected joints.
- Slows disease progression: can reduce long-term joint damage compared with no DMARD therapy.
- Works gradually: immune modulation typically takes time to show full effect.
Pharmacokinetics (how the body handles leflunomide)
Understanding pharmacokinetics can help explain why Arava may have a delayed onset and why stopping it may require special steps if pregnancy is planned.
Absorption and active metabolite
- Leflunomide is absorbed after oral dosing and is metabolised to the active metabolite teriflunomide.
- The active metabolite has a long half-life, meaning it can remain in the body for a long time after treatment stops unless a clearance procedure is used.
Distribution
Teriflunomide distributes into body tissues, with a high degree of protein binding. This is one reason it can persist in the bloodstream.
Metabolism and elimination
- Teriflunomide is cleared slowly; in most cases, the medicine can remain detectable for an extended period.
- If rapid elimination is required (for example, when stopping due to pregnancy planning), clinicians may use a specific accelerated elimination protocol (often with cholestyramine or activated charcoal).
Because of this prolonged presence, it is especially important to follow your clinician’s advice about stopping, missed doses, and pregnancy-related precautions.
Typical uses in the UK
Arava (leflunomide) is used as a disease-modifying anti-rheumatic drug in:
- Rheumatoid arthritis (RA) – to reduce symptoms and slow disease progression.
- Psoriatic arthritis (PsA) – in selected cases, depending on clinical assessment.
Your exact treatment plan depends on factors such as disease severity, previous DMARD experience, other health conditions, and blood test results.
When and how to take Arava (timing and regimen)
Arava is taken by mouth, usually once daily. Timing can vary depending on the starting strategy used by your clinician.
Starting regimens (common approaches)
Many patients begin with a loading dose to reach effective levels more quickly, followed by a maintenance dose. Other patients may start directly at a maintenance dose based on tolerability and risk factors.
- Loading dose (if used): typically taken once daily for a short period.
- Maintenance dose: continued once daily thereafter.
How to take tablets
- Swallow the tablet(s) with water.
- Try to take it at the same time each day to help you remember.
- If you miss a dose, follow the instructions given to you by your healthcare team.
If you are unsure about what to do after a missed dose, ask your pharmacist.
Food interactions and practical dietary advice
Food interactions with leflunomide are generally not significant enough that you must take it with a specific meal. Many people take it with or without food depending on comfort.
- Consistency helps: choose a routine (with breakfast or with dinner) that suits you.
- Stomach comfort: if you experience nausea or indigestion, taking it with food may help.
- Do not change your dose: any adjustments should be guided by your clinician.
If you have dietary restrictions due to other medical conditions, discuss them with your healthcare team.
Alcohol and medicine interactions
Alcohol
Arava can affect the liver and may raise liver enzymes in some people. Because of this:
- It is often recommended to limit alcohol while taking Arava.
- Avoid heavy or binge drinking.
- If you have a history of liver disease, alcohol dependence, or elevated liver enzymes, you should seek tailored advice from your clinician.
If you notice symptoms that could suggest liver problems—such as unusual fatigue, dark urine, yellowing of the skin/eyes (jaundice), persistent nausea, or right-sided upper abdominal pain—seek medical advice promptly.
Common medicine interactions (overview)
Arava has important interaction potential, especially with medicines that also affect the liver or the immune system. Always tell your pharmacist and clinician about:
- All prescription medicines
- Over-the-counter (OTC) medicines
- Herbal products (for example, preparations containing St John’s Wort)
- Vaccines and infection-related treatments
Key interaction themes include:
- Risk of liver effects: combining with other liver-stressing drugs may increase risk.
- Blood count effects: medicines that suppress bone marrow may compound effects.
- Immune modulation: combining with other immunosuppressants may increase infection susceptibility.
- Warfarin: warfarin (a blood thinner) can be affected; careful monitoring may be needed.
Cholestyramine/activated charcoal (not an alcohol interaction, but relevant)
In some situations, an accelerated elimination is used to clear teriflunomide rapidly. This involves agents such as cholestyramine or activated charcoal and can reduce drug levels.
Indications (what Arava is used for)
In the UK, leflunomide is indicated for:
- Active rheumatoid arthritis (RA) in adults.
- Active psoriatic arthritis (PsA) in adults.
Your rheumatology team may use it alone or in combination with other treatments depending on your disease activity and how you respond.
How dosing works in practice (adults)
Dosing of Arava varies by individual circumstances. However, common adult regimens include:
| Stage | Typical approach | Notes |
|---|---|---|
| Starting (loading, if used) | Once daily for a limited period | Designed to reach effective drug levels faster. |
| Maintenance | Once daily ongoing | Dose may be adjusted based on response and blood tests. |
| Special situations | Adjusted plan | May differ in older adults, liver-risk patients, or those with intolerance. |
Important: Always follow the dose you were given. Do not start, stop, or change the dose without medical advice. If you are switching from one DMARD to another, your healthcare team will provide a safe transition plan.
Safety profile and key precautions
Like all medicines, Arava can cause side effects. Many patients tolerate it well, but regular monitoring is an important part of safe use, particularly for the liver and blood cell counts.
Common side effects
- Diarrhoea or stomach upset
- Nausea
- Headache
- Increased liver enzymes found on blood tests
- Weight loss or decreased appetite (less common)
- Raised blood pressure in some cases
- Hair thinning in some patients
Serious side effects – seek urgent medical advice
Contact medical help promptly if you develop signs suggestive of severe infection, liver injury, blood disorders, or other serious reactions:
- Signs of infection: fever, chills, persistent cough, painful urination
- Allergic reactions: swelling of face/lips, rash with breathing difficulty
- Liver problems: jaundice (yellow skin/eyes), dark urine, severe upper abdominal pain
- Breathing problems: new or worsening shortness of breath or persistent cough
- Unusual bruising/bleeding or severe weakness (possible blood count issues)
Monitoring requirements
Your clinician will usually arrange blood tests at intervals to monitor:
- Liver function
- Full blood count (including blood cells)
- In some cases, additional parameters depending on your overall health
Monitoring frequency can vary, but it is especially important early in treatment and after dose changes. Keep appointments and report symptoms between tests.
Practical tips for day-to-day use
- Keep a medication routine: setting a daily reminder can prevent missed doses.
- Stay consistent with your timing: it may help side effects and adherence.
- Attend scheduled blood tests: they protect you and help ensure the medicine is safe for you.
- Report new symptoms early: don’t wait for your next appointment if you feel unwell.
- Use contraception precautions when relevant: see “Pregnancy and fertility” below.
- Avoid unnecessary liver stress: limit alcohol and ask before starting new OTC medicines.
- Know your “sick day” plan: if you develop a significant infection, contact your clinician for advice.
Pregnancy, fertility, and breastfeeding (important safety information)
Arava is associated with serious risks to an unborn baby. Because teriflunomide persists for a long time, extra precautions are required when there is a possibility of pregnancy.
- Women who are pregnant or planning pregnancy should not use leflunomide.
- Contraception is typically required during treatment and for a period after stopping, guided by specialist advice and sometimes a drug elimination procedure.
- Breastfeeding: discuss with your clinician, as it may not be recommended.
If you or your partner are planning pregnancy, you should speak to your healthcare team well in advance.
Alternative options to consider
If leflunomide is not suitable due to side effects, interactions, or other concerns, clinicians may consider other DMARDs and biologic agents depending on your diagnosis and disease severity.
Common alternative DMARDs
- Methotrexate
- Sulfasalazine
- Hydroxychloroquine
- Biologic DMARDs (for selected patients) such as TNF inhibitors or other pathway agents
Your rheumatology team can help you weigh benefits and risks based on your medical history, blood test results, infection risk, and response to previous therapies.
UK market and legal context (patient-friendly overview)
Arava (leflunomide) is a regulated medicine in the United Kingdom. It is provided to eligible patients through the National Health Service (NHS) or private services, according to clinical need and local prescribing arrangements.
In the UK, medicines are authorised and monitored under the medicines regulation framework. Safety updates, changes in prescribing information, and pharmacovigilance findings can lead to revisions of warnings or monitoring advice.
Availability can vary by formulation and local supply. Your pharmacy can confirm current stock and suitable alternatives if supply issues arise.
Recent guidance and monitoring best practice (UK-relevant)
UK clinical practice for inflammatory arthritis generally emphasises:
- Regular disease monitoring to ensure treatment targets are being met.
- Blood test monitoring for DMARD safety, particularly for medicines with liver and blood count risks.
- Infection vigilance and proactive vaccination discussions where appropriate.
- Medication reconciliation and interaction checks when starting other treatments (including antibiotics, antifungals, and pain medicines).
Keep an eye on your clinician’s advice and any updates they provide. If you have questions about monitoring frequency, you can ask your pharmacist or rheumatology team.
Delivery and availability (how online pharmacies typically work in the UK)
Online pharmacies in the UK generally aim to provide:
- Reliable product availability where possible.
- Clear packaging and delivery tracking options.
- Secure handling to protect medicine integrity during transit.
- Support for supply substitutions if a particular brand pack is temporarily unavailable.
Delivery times can vary by provider and location. You should check the estimated delivery window at checkout and allow time for pharmacy processing. If you need your medicine urgently, contact the pharmacy for availability guidance.
Frequently asked questions (FAQ)
1) How long does Arava take to work?
Some people notice improvement within weeks, but it can take several months to reach maximum benefit. Ongoing monitoring helps confirm your response and tolerability.
2) Can I take Arava with other rheumatoid arthritis medicines?
Often, DMARDs may be combined or switched depending on your condition and blood test results. However, combining medicines can increase side effect or interaction risk. Always get medication advice before taking additional DMARDs or immunosuppressants.
3) What blood tests will I need?
Common monitoring includes liver function tests and a full blood count. Your clinician will specify how often you need these based on your health and treatment stage.
4) Is it safe to drink alcohol while taking Arava?
Alcohol can increase the risk of liver strain. Many clinicians advise limiting alcohol and avoiding heavy use. If you have liver risk factors, you may be advised to avoid alcohol altogether.
5) What should I do if I get an infection?
If you develop signs of infection (fever, worsening cough, painful urination, or feeling seriously unwell), contact your healthcare team promptly. They may adjust treatment depending on severity.
6) Can Arava be stopped if I feel better?
Stopping DMARD therapy can allow the underlying disease to flare. Any decision to stop or change treatment should be discussed with your rheumatology team.
7) Do I need special precautions if I’m planning pregnancy?
Yes. Arava can cause harm to an unborn baby, and its active metabolite can remain in the body for a long time. If pregnancy is planned, discuss a safe stopping and drug clearance plan with your clinician well in advance.
8) Are there foods I should avoid?
There are no major mandatory dietary restrictions for most people. Taking Arava consistently with or without food is usually fine. If you experience stomach upset, taking it with food may help.
9) Does Arava interact with warfarin or blood thinners?
Leflunomide can interact with some anticoagulants, including warfarin. If you take a blood thinner, ensure your clinician monitors you appropriately.
10) What should I do if I miss a dose?
If you miss a dose, follow the advice you were given by your healthcare team or pharmacy. If you are unsure, contact your pharmacist for guidance rather than doubling doses.
Always seek medical advice for personalised information about your condition, suitability of treatment, and how to manage side effects or interactions. If you experience severe symptoms such as signs of infection, jaundice, or breathing difficulty, seek urgent medical help.
