Aidra

Quick links to important sections

Medically reviewed

Rosario Oropesa

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Aidra

Quick Facts

Property Description
Active Ingredient Leflunomide (INN)
Form Film-coated tablets, oral administration
Pharmacological Class Disease-Modifying Antirheumatic Drug (DMARD); Immunosuppressant
Origin Synthetic prodrug
General Purpose To modulate the immune system and modify disease activity

Aidra is a prescription medicine containing the active substance Leflunomide. It is classified as a synthetic, non-biological Disease-Modifying Antirheumatic Drug (DMARD). Its general purpose is to provide long-term systemic control of chronic inflammatory conditions by modulating the activity of the body's immune system, a role associated with slowing the structural damage associated with these conditions.

What Type of Medicine is Aidra?

Aidra is primarily classified as a DMARD and an Immunosuppressant, a pharmacological class recognized by major regulatory bodies. This classification signifies that the drug is intended to intervene in the core biological processes driving the disease, controlling the underlying, immune-driven inflammation. Unlike simple symptom relievers, Aidra's therapeutic objective is to modify the course of the condition itself and reduce signs of active disease.

Composition, Form, and Origin

The single active substance in Aidra is Leflunomide (INN), a chemically synthesized compound delivered as a film-coated tablet for oral administration. Leflunomide functions as a prodrug; it is chemically inactive upon ingestion but is rapidly converted by the body into its active metabolite, Teriflunomide (A771726). This conversion is essential for the drug to exert its effective immunosuppressive influence.

How Does Aidra Differ From Symptom Relief?

The core mechanism of Aidra involves acting as a pyrimidine synthesis inhibitor, which is how it achieves its therapeutic effect. The active metabolite works by inhibiting a critical enzyme, thereby preventing the rapid proliferation of overactive immune cells (lymphocytes) that drive inflammation. This mechanism allows Aidra to limit the fundamental cellular activity that causes damage, dampening the chronic disease process and limiting long-term destructive activity.

Regulatory References

  1. clinically recognized for slowing the structural damage

What side effects are possible with Aidra?

Possible Side Effects and Safety Information

The safety profile of Aidra, which contains the active substance leflunomide, is defined by a range of officially documented adverse reactions categorized by frequency and the body system affected, according to regulatory documents (e.g., EMA SmPC and FDA Label).


Adverse Reaction Classifications

Frequency Category Examples of Officially Listed Reactions
Very Common (1/10) Diarrhoea, nausea, headache, elevated liver enzymes, hair loss (alopecia), and leukopenia.
Common (1/100 to < 1/10) Mild hypertension, dizziness, oral mucosal disorders, thrombocytopenia, and rash.
Rare (1/10,000 to < 1/1,000) Hepatitis, severe infections, pancytopenia, and interstitial lung disease.

Adverse effects are documented across several System-Organ Classes, notably Hepatobiliary Disorders (risks to the liver), Blood and Lymphatic System Disorders (effects on blood cell counts), and Gastrointestinal Disorders.


Serious Adverse Reactions and Restrictions

Official labeling highlights the risk of Severe Liver Injury, including fatal hepatic failure, which is a key safety restriction. Serious Infections and Interstitial Lung Disease (pneumonitis) are also documented as rare but clinically critical risks.

The medicine is contraindicated in specific populations: individuals with severe hepatic impairment, those with severe immunodeficiency or uncontrolled infections, and women who are pregnant or breastfeeding. The regulatory safety information notes that certain effects, such as elevated liver enzymes, may be more likely to occur at the start of treatment.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose Scope

Category Official Regulatory Statement
Documented overdose presentations Symptoms observed in overdose cases include diarrhea, stomach pain, extreme tiredness, weakness, pale skin, fast heartbeat (tachycardia), and shortness of breath.
Physiological systems affected Gastrointestinal, hematological, and hepatic systems. Adverse events reported are consistent with the known safety profile, including elevated liver function tests.
Dose-related or exposure-related factors Reports include cases of chronic overdose taking doses up to five times the recommended daily dose, and acute overdoses in various populations.
Population-specific overdose notes The risk of severe hepatic toxicity, including fatal liver failure, is heightened in patients with pre-existing liver disease. The drug is contraindicated in patients with severe hepatic impairment.
Emergency-response statements In the event of a significant overdose or toxicity, perform an accelerated drug elimination procedure. Contact a poison control center or seek emergency medical attention.
When immediate medical help is required Immediately call emergency services if the victim has collapsed, had a seizure, has trouble breathing, or cannot be awakened.

Overdose Classifications (High-Level)

Category Official Regulatory Statement
Severity classification Significant overdose or toxicity; severe liver injury (including fatal liver failure); life-threatening event.
Regulatory basis FDA Prescribing Information, NIH/MedlinePlus Drug Information, EMA regulatory guidelines.
Overdose-context constraints The active metabolite is slowly eliminated from the plasma, necessitating accelerated elimination and prolonged monitoring.

Resulting Overdose Structure

Official overdose statements:

  • Overdose may present with documented gastrointestinal symptoms and hematological findings, alongside elevated liver function tests.
  • Urgent medical attention is required immediately if the presentation escalates to life-threatening signs such as collapse or seizure.
  • Severe liver injury is a documented risk associated with toxicity, particularly in susceptible populations.
  • Management mandates the use of an accelerated drug elimination procedure, typically using Cholestyramine or Activated Charcoal, to rapidly reduce plasma concentrations.
  • Monitoring of liver tests (ALT) is necessary weekly until values are normalized following suspected overdose or toxicity.

Connection to the overall overdose profile (3 sentences): Regulatory documents define the overdose profile by listing a specific cluster of expected clinical manifestations associated with excessive exposure, such as fast heartbeat and paleness. The guidance explicitly mandates immediate emergency services if the presentation includes life-threatening signs. Due to the drug's long half-life, the regulator requires managing significant overdose through a documented accelerated elimination procedure, followed by weekly monitoring of liver tests until normalization.

Therapeutic Uses of Aidra

Aidra, which contains the active substance leflunomide, is commonly used to address the systemic burden associated with certain chronic inflammatory conditions. The therapeutic role of the active ingredient is applied in addressing two specific conditions in adults: active rheumatoid arthritis and active psoriatic arthritis.

This medicine is considered relevant for easing symptom clusters that may become intense or disruptive in conditions involving inflammatory or irritative processes. It may assist with managing symptoms related to physical discomfort and symptoms that interfere with daily functioning. This is a clinical context where supportive relief may be appropriate.

“It helps maintain a sense of stability when symptoms are more noticeable.”

When symptoms intensify temporarily, using this medicine contributes to improved comfort and supports patients during these difficult episodes. It assists with managing the episodic or fluctuating manifestations of these conditions, contributing to easing the overall symptom load.

Quick Fact: Relief for Symptoms related to physical discomfort

Regulatory References

  1. European Medicines Agency (EMA) overview on leflunomide

Eligibility and Restrictions for Use

Eligibility Scope

Aidra (Leflunomide) is officially documented for use only in adult patients (18 years and older) with active rheumatoid arthritis or active psoriatic arthritis. Use in the paediatric population (below 18 years) is not recommended by regulatory agencies, as safety and efficacy have not been established in this age group.

Contraindicated Populations

Regulatory documents stipulate that Aidra is contraindicated and must not be used in several patient groups:

  • Pregnant women or women who are planning to become pregnant.
  • Breast-feeding women.
  • Patients with severe hepatic impairment or pre-existing acute or chronic liver disease.
  • Patients with severe immunodeficiency states (e.g., AIDS) or severe hypoproteinaemia.
  • Patients with significantly impaired bone marrow function or severe pre-existing cytopenias (low blood cell counts) unrelated to the arthritis being treated.
  • Patients with serious infections or known hypersensitivity to the active substance.

Eligibility-Related Restrictions

Women of childbearing potential are contraindicated unless reliable contraception is used during treatment and until the active metabolite is confirmed to be below a safe plasma level. For men intending to father a child, regulatory guidance recommends stopping the medicine and considering an accelerated drug elimination procedure. The medicine is also contraindicated in the European Union for patients with moderate to severe renal insufficiency due to insufficient clinical experience.

What should I know about interactions with other medicines?

Aidra, a combined oral contraceptive containing desogestrel and ethinyl estradiol, can interact with various other medicines and products, potentially affecting its effectiveness or increasing the risk of side effects. It is critical to inform your healthcare provider of all prescription and non-prescription drugs, herbal supplements, and over-the-counter products you use.

Medicines that may reduce Aidra’s effectiveness

Certain medications can accelerate the breakdown of the hormones in Aidra in the liver, leading to lower contraceptive protection. Use of an additional non-hormonal birth control method may be necessary while taking these, and for a period after stopping them.

Drug Type Examples of Active Substances
Anticonvulsants Carbamazepine, Phenytoin, Topiramate, Phenobarbital, Oxcarbazepine
Anti-infectives Rifampin, Griseofulvin
HIV/Hepatitis C drugs Certain Protease Inhibitors (Ritonavir), non-nucleoside reverse transcriptase inhibitors
Herbal supplements St. John’s wort (Hypericum perforatum)

️ Medicines and Products that may increase Aidra’s effects

Some medicines may decrease the breakdown of Aidra, leading to increased hormone levels and potentially higher risks of adverse effects like nausea or breast tenderness.

  • Grapefruit juice can increase the concentration of ethinyl estradiol in the body, and its consumption should be avoided.

  • Certain antifungals (e.g., Ketoconazole) or antivirals (e.g., certain Hepatitis C regimens) can increase the levels of Aidra's hormones.

Potential for other interactions

Aidra can also affect how other medications work, such as increasing the levels of Caffeine or Theophylline, or decreasing the effectiveness of antidiabetic agents. Special monitoring or dose adjustments are necessary when taking Aidra concurrently with other medicines like Lamotrigine, as Aidra may reduce its concentration.

Mechanism of Action

How Aidra Works

Molecular Mechanism: DHODH Inhibition

Aidra is converted into its active metabolite, Teriflunomide, which functions as a selective, non-competitive inhibitor of the mitochondrial enzyme Dihydroorotate Dehydrogenase (DHODH). By binding to DHODH, the drug interrupts a rate-limiting step in the de novo pyrimidine synthesis pathway, leading to an intracellular shortage of nucleic acid precursors required for replication.

Selective Cytostatic Effect

The shortage of pyrimidines produces a targeted, antiproliferative (cytostatic) effect specifically on highly active immune cells, such as activated T and B lymphocytes. These cells have an increased metabolic demand and are highly dependent on the de novo pathway. The depletion of precursors forces these lymphocytes into G1 phase cell cycle arrest, which suppresses their clonal expansion without causing immediate cell death.

Systemic Physiological Consequence

The selective limitation of lymphocyte proliferation contributes to the alteration in sustained immune cell activity. This mechanism operates at the cellular level to reduce the overall burden of immune-driven cellular processes. Because the action is cytostatic, the resulting physiological change in systemic cellular activity is gradual and sustained.

Dosage and Administration Information

How to Use Aidra

Aidra (leflunomide) is a prescription medicine intended for long-term management and must be initiated and supervised by specialists experienced in treating the approved inflammatory conditions. It is classified for oral administration as a film-coated tablet.

Official Dosing Regimen

The treatment pattern for Aidra consists of two distinct phases: an initial, short-term loading dose followed by an ongoing maintenance dose.

Dosing Phase Dosage and Schedule Conditions
Loading 100 mg once daily for 3 days May be omitted at the specialist's discretion for certain patients.
Maintenance 10 mg or 20 mg once daily Dose reduction to 10 mg once daily may be considered if 20 mg is not well tolerated.

Administration Guidelines

For proper administration, the tablets should be swallowed whole with a sufficient amount of liquid. The tablets may be taken with or without food, as meals do not significantly impact the extent of absorption. The medicine is generally taken once daily and is an ongoing treatment for the underlying chronic disease.

Population-Specific Use

No dose adjustment is typically required for older adults (65 years and above). Aidra is not recommended for use in the pediatric population (under 18 years) due to insufficient efficacy and safety data in that age group.

Recent Clinical Evidence

Aidra: Recent Clinical Evidence

Evidence for use in Active Rheumatoid Arthritis (RA)

The research base for Aidra's use in active rheumatoid arthritis (RA) primarily consists of Randomized Controlled Trials (RCTs) involving adult patients. Studies monitored clinical outcomes like joint swelling and disease activity scores (DAS28), alongside patient-reported measures of daily function (HAQ). Longer-term observational studies included X-ray analysis to report measurements related to structural changes over the study period. Findings describe group patterns related to these measured outcomes. The evidence highlights that long-term patient retention observed in routine practice can be lower than in controlled trials.

Evidence for use in Active Psoriatic Arthritis (PsA)

Research for active PsA also relies on Randomized Controlled Trials. These studies focused on adult patients with peripheral joint inflammation and often coexisting skin symptoms. Researchers evaluated outcomes using specialized criteria, including the Psoriatic Arthritis Response Criteria (PsARC) for joints and the Psoriasis Area and Severity Index (PASI) for skin lesions. Studies reported changes in these metrics over defined time intervals, describing measurements related to inflammatory and irritative symptoms.

Research Gaps and Unanswered Questions

The evidence base has notable limitations. For psoriatic arthritis, activity for axial disease (spine involvement) is generally not established by clinical trials, and comparative evidence against all other DMARDs remains limited. While structural changes in RA have been studied, the evidence for measurements of structural changes in PsA is limited. Furthermore, data for pediatric patients (children) is insufficient or unavailable in the primary evidence records, and long-term effects are not well characterized by controlled trials alone.

Frequently Asked Questions (FAQ)

Common questions about Aidra (FAQ)

Q: What is the main reason doctors prescribe Aidra?

A: Aidra is officially prescribed for the long-term management of active Rheumatoid Arthritis (RA) and active Psoriatic Arthritis (PsA). It is intended for use in adults to help reduce the signs and symptoms of these chronic inflammatory conditions.


Q: How quickly does Aidra start working after the first time taking it?

A: Studies and official product information indicate that the therapeutic effect of Aidra is generally gradual. The active substance has a long half-life, meaning it takes time—approximately 20 weeks—for the drug to reach a steady level in the body where it can exert its full effect.


Q: What happens if I stop taking Aidra suddenly?

A: If treatment with Aidra is discontinued, the active substance can remain in the system for up to two years without intervention. Official regulatory documents note that an accelerated drug elimination procedure—such as utilizing specific medications like cholestyramine or activated charcoal—is typically utilized to rapidly clear the substance from the body.


Q: Can Aidra cause long-term health issues?

A: Regulatory documents include a Boxed Warning that highlights the risks of certain serious complications. These include the potential for severe liver injury, which can be fatal, and rare but serious risks like severe infections and a lung condition called interstitial lung disease. Monitoring tests are typically implemented by the healthcare provider.


Q: Does Aidra have a 'black box warning' from the FDA?

A: Yes, the official product labeling from the FDA includes a Boxed Warning—sometimes referred to as a 'black box warning.' This warning highlights two critical safety concerns: the risk of Embryo-Fetal Toxicity (harm to an unborn baby) and the risk of Severe Liver Injury.


Q: Is it possible for Aidra to cause weight gain or weight loss?

A: Official reports and post-market data indicate that weight loss has been associated with the use of the active ingredient in Aidra. This is a potential effect that has been reported by patients during clinical studies.


Q: What are the ingredients in Aidra besides the main active component?

A: The active substance in Aidra is leflunomide. Official documentation lists various inactive ingredients (excipients) necessary to form the tablet, which may include components such as magnesium stearate, lactose monohydrate, titanium dioxide, and povidone.


Q: What kind of monitoring or tests are required while taking Aidra?

A: Due to the potential for serious adverse reactions, regulatory guidance requires ongoing laboratory tests. These include checks for serum alanine aminotransferase (ALT) to monitor liver function and checks of blood cell counts (such as white blood cells and platelets). Blood pressure should also be routinely checked.


Q: How long does Aidra stay in your system after the last dose?

A: The active substance in Aidra has a very long duration in the body, with a typical half-life of about two weeks. Without an accelerated elimination procedure to actively remove the drug, it can take up to two years for the active metabolite to clear and reach undetectable levels in the plasma.


Q: Is Aidra considered a new or established medication?

A: Aidra is considered an established medication in its class. Its active ingredient, leflunomide, received initial approval from the FDA in 1998 as a Disease-Modifying Antirheumatic Drug (DMARD).


Q: What happens if I forget a dose of Aidra?

A: Official guidance describes the approach for a missed dose as taking it as soon as possible, or skipping it if it is almost time for the next dose. Official guidance describes that a double dose should not be taken to make up for a single missed dose.


Q: Is it normal to feel a change in mood while on Aidra?

A: While the full range of side effects is complex, official product information indicates that patients should be monitored for any unusual mental or mood changes. These changes may be considered a potentially serious side effect.


Q: Can Aidra be taken with over-the-counter pain relievers like ibuprofen?

A: Information on drug interactions suggests that combining Aidra with NSAIDs, such as ibuprofen, may increase the risk of liver damage. This potential interaction may lead to the need for dosage adjustment or increased monitoring by a healthcare provider.


Q: Does Aidra have any documented interaction with alcohol?

A: Yes, official regulatory labels indicate that alcohol use should be avoided while taking Aidra. This precaution is due to the increased risk of hepatotoxicity (liver damage), as both alcohol and Aidra can affect the liver.


Q: What should I do if I suspect an allergic reaction to Aidra?

A: Serious symptoms like an allergic response require immediate medical evaluation. Symptoms that warrant immediate care include difficulty breathing, the development of hives, or swelling of the face, mouth, or throat.


Q: Why is Aidra sometimes referred to by a different name?

A: Aidra is a specific brand name for the generic active substance leflunomide. Because of this, the medicine may be referred to by its generic name or by other brand names under which it is marketed internationally, such as Arava.


Q: Is it true that Aidra can affect vision?

A: Official safety data lists vision changes as a symptom that may be associated with more serious side effects. If a patient experiences vision changes while taking Aidra, it is a symptom that may require immediate medical evaluation.

How should Aidra be stored and disposed of?

Storage Requirements

Aidra (leflunomide) must be stored strictly according to the conditions defined in the regulatory labeling to maintain product stability and effectiveness.

Condition Official Requirement
Temperature Store at controlled room temperature, 20 C to 25 C (68 F to 77 F).
Protection Keep the tablets away from excess heat, moisture, and direct light.
Handling Keep from freezing. Store in the original container and keep the container tightly closed.
Stability Do not use the medicine after the expiration date printed on the packaging.
Child Safety Mandatory instruction: Keep out of the sight and reach of children at all times.

Disposal Instructions

Proper disposal is required to protect the environment and prevent accidental ingestion. Unused or expired Aidra should not be disposed of in wastewater or household trash unless prepared according to specific guidelines.

  • Method: The official recommendation is to utilize a drug take-back program or a designated collection point, which can be identified by consulting a pharmacist.
  • Alternative: If a take-back program is unavailable, non-flushable medicines like Aidra should be mixed with an unappealing substance (like dirt or coffee grounds) and placed in a sealed bag before being disposed of in the trash.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

Available in countries:

Equivalent of Aidra found in:

A-Z Index: