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Antril

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Antril

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Medically reviewed

Marina Burgos

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.

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Overview of Antril

Quick Facts

Property Description
Active ingredient Anakinra (rhIL-1Ra)
Form Solution for injection (pre-filled syringe)
Pharmacological class Interleukin-1 receptor antagonist; Immunosuppressive agent
Common use Reducing systemic inflammatory activity
Origin Biological (recombinant protein)

What is Antril (Anakinra) and How is it Classified?

Antril is the name associated with the active ingredient Anakinra, which is classified as a highly specific biologic drug and an immunosuppressive agent. Anakinra belongs to the pharmacological class of interleukin-1 receptor antagonists. This drug is a recombinant human protein, derived through biotechnology, and is structurally modeled after the natural human protein known as the endogenous interleukin-1 receptor antagonist. This distinction confirms that it is not a small-molecule synthetic compound but a targeted biologic.

What is Anakinra's Primary Mechanism and General Purpose?

The primary general purpose of Antril is to reduce chronic, inappropriate inflammatory activity by neutralizing a key inflammatory signal. Anakinra achieves this through competitive inhibition, by binding to the cellular receptors for the powerful pro-inflammatory cytokine Interleukin-1 (IL-1). This action prevents the natural, disease-causing IL-1 protein from attaching and initiating its damaging cascade within the cell. Anakinra is effective in blocking the biological activities of both IL-1alpha and IL-1beta, as the medication specifically targets the core messengers responsible for driving damaging inflammation.

Composition and Pharmaceutical Form of Antril

Antril is supplied as a sterile solution for injection in a ready-to-use pre-filled syringe, delivered via subcutaneous injection. The product is a single-ingredient product, containing the active substance Anakinra (rhIL-1Ra) dissolved in a sterile aqueous solution base. This injectable formulation is necessary because, as a delicate protein-based therapeutic, Anakinra would be degraded by the digestive system if taken orally. The unique protein composition necessitates the subcutaneous delivery, which ensures the medication's bioavailability and therapeutic integrity.

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What side effects are possible with Antril?

Possible Side Effects and Safety Information

The safety profile of Antril (Anakinra) is structured around categories of officially documented adverse reactions and specific usage restrictions, as established in government regulatory documents.

Frequency-Classified Adverse Reactions

The frequency of observed effects is defined by regulatory standards:

Classification Common Examples System-Organ Class Focus
Very Common (ge 1/10) Injection Site Reactions (ISRs), Headache Skin and Subcutaneous Tissue, Nervous System
Common (ge 1/100 to < 1/10) Serious Infections, Neutropenia, Upper Respiratory Tract Infection Infections and Infestations, Blood and Lymphatic System
Uncommon (ge 1/1,000 to < 1/100) Allergic reactions, Hepatic enzyme elevations Immune System, Hepatobiliary Disorders

Serious Adverse Reactions and Safety Considerations

The most clinically significant safety concerns documented in regulatory labeling are Serious Infections, which include bacterial infections such as cellulitis and pneumonia, and Neutropenia, a substantial reduction in the absolute neutrophil count. Hypersensitivity reactions, including rare instances of anaphylaxis or Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS), have also been officially reported.

Time-Related Patterns are noted for certain events: Injection Site Reactions most frequently occur during the first 4 weeks of therapy, while the incidence of Serious Infections is observed to remain stable over time during long-term use.

Safety Restrictions define when the medication should not be used. Treatment is formally restricted in individuals with a known hypersensitivity to extitE. coli derived proteins or those presenting with an active infection. Furthermore, initiation is restricted if the absolute neutrophil count falls below a specified regulatory threshold. Caution is also advised when treating patients with severe hepatic impairment or impaired renal function.

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Overdose and Emergency Response

Antril Overdose and When to Seek Help

The official regulatory documentation provides specific findings regarding overdose scenarios involving Antril (Anakinra). These findings primarily address the clinical presentation and the required emergency response measures, as no specific antidote is known to counteract the drug's effects.


Overdose Findings and Required Action

Key Finding Regulatory Conclusion
Documented Manifestations The clinical trials did not identify dose-limiting toxicities unique to overdose exposure. High-dose exposure (e.g., up to 2 mg/kg/hour for 72 hours in related studies) resulted in an adverse event profile that was not significantly different from the standard therapeutic use.
Emergency Management In the event of a suspected or known overdose, immediate medical attention must be sought. Management is mandated to consist of symptomatic and supportive treatment while the patient is placed under close clinical observation in a healthcare setting.

Since no specific antidote is available, the primary response to a suspected overdose is to contact emergency services without delay. This ensures the prompt initiation of supportive care and clinical monitoring, which constitute the required management strategy as established by official health authorities. This approach applies to all overdose situations where severe symptoms may present, such as difficulty breathing or unresponsiveness.

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Therapeutic Uses of Antril

What Antril Treats: Main Uses and Benefits

Antril (Anakinra) may be part of symptomatic management for chronic inflammatory conditions where excessive internal signaling leads to significant and persistent symptoms. The medication may be relevant when supportive symptom management is appropriate and contributes to easing the overall symptom load during periods of heightened symptoms. The application of this therapy covers several specific inflammatory disease categories.


Key Therapeutic Applications

Antril is relevant in contexts marked by increased discomfort and may be used to manage conditions like moderately to severely active rheumatoid arthritis (RA) in specific adult patients, as well as the rare, inherited conditions known as Cryopyrin-Associated Periodic Syndromes (CAPS), and systemic disorders like Adult-Onset Still's Disease (AOSD). It is applied across domains where additional symptomatic support is needed to address symptom clusters that may become intense or disruptive, such as recurring fever, systemic rash, and joint swelling and pain.

“Antril supports patients during difficult episodes by easing distress and may help them cope more steadily with symptom fluctuations.”

In clinical settings that involve acute or unstable symptom patterns, its use may be considered relevant when short-term symptomatic assistance is needed to address symptoms related to heightened physiological activity. The medication provides support that helps ease the overall symptom burden and may assist with maintaining functional stability.


Summary: Support for Symptomatic Management

Condition Category Symptom Management Focus
Autoinflammatory Syndromes Recurring fever, rash, organ-specific functional stress
Systemic Arthritis (RA, AOSD) Joint swelling, pain, chronic systemic symptoms
Acute Hyperinflammation Heightened physiological activity, functional stability support

Regulatory References

  1. European Medicines Agency product information on Kineret (Anakinra) for professionals
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Eligibility and Restrictions for Use

Official Regulatory Eligibility and Restrictions

Antril (Anakinra) eligibility is strictly defined by regulatory authorities based on population factors and clinical status.

Populations Allowed or With Established Use

  • Adults (ge 18 years): Approved for Rheumatoid Arthritis (RA).
  • Pediatric (ge 8 months, ge 10 kg): Approved for specific autoinflammatory syndromes, such as CAPS and Still's Disease (SJIA/AOSD).

Populations For Whom Use is Contraindicated

  • Patients with known hypersensitivity to the medicine, its excipients, or to E. coli derived proteins.
  • Patients with neutropenia, defined as an Absolute Neutrophil Count (ANC <1.5 imes 10^9/ l). Treatment initiation is prohibited.

Conditional Use and Restrictions

  • Treatment must not be initiated in the presence of active infections.
  • Use is not recommended in combination with TNF-blocking agents or in patients with pre-existing malignancy.
  • Caution is advised for the elderly and those with moderate/severe renal or hepatic impairment.
  • The medicine is not recommended during pregnancy or breastfeeding, and women must use effective contraception during therapy.
  • The efficacy for pediatric RA (JIA) is not established.
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What should I know about interactions with other medicines?

Interactions with other medicines and products

Antril (Anakinra) has an official interaction profile focused on pharmacodynamic effects on the immune system and pharmacokinetic considerations related to enzyme activity and clearance.

Classification Restriction and Interacting Substance
Prohibited Co-administration Live-Virus Vaccines must not be given concurrently.
Not Recommended Co-administration TNF-Blocking Agents (e.g., Etanercept) due to a documented increase in the rate of serious infections and neutropenia.

Metabolic and Clearance Considerations

Official labeling describes a potential for a pharmacokinetic interaction involving drug-metabolizing enzymes. Chronic inflammation can suppress the formation of hepatic CYP450 enzymes. Antril may reverse this suppression, which leads to a normalization of CYP enzyme activity.

This normalization requires therapeutic monitoring and potential dose adjustment of co-administered CYP450 substrates that have a narrow therapeutic index, such as Warfarin or Phenytoin, upon starting or discontinuing Antril.

Because Antril is substantially excreted by the kidney, a population-specific interaction caution is documented for patients with severe renal impairment (creatinine clearance < 30 mL/min). In this population, administration of the prescribed dose every other day should be considered due to the increased risk of exposure to the drug.

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Mechanism of Action

Targeted Blockade of the Interleukin-1 Receptor

Antril (Anakinra) works by acting as a highly specific competitive antagonist for the Interleukin-1 Type 1 Receptor (IL-1R1). This mechanism is one of pure receptor blockade, physically preventing the pro-inflammatory ligands, IL-1 α and IL-1 β, from binding and initiating cellular signaling. By neutralizing this critical upstream messenger, the drug selectively targets a core molecular mediator of systemic inflammation.

Interruption of Downstream Inflammatory Cascades

The blockade of IL-1R1 immediately arrests the intracellular signaling cascade, which involves preventing the activation of key components like NF-κ B. This interruption suppresses the subsequent gene expression of a broad range of secondary inflammatory mediators and reduces the synthesis of IL-1-mediated pro-catabolic enzymes. The resulting physiological consequence is the systemic dampening of the acute phase response.

Modulation of Pyrogenic and Acute Phase Responses

This specific mechanistic action translates directly into core physiological adjustments: the inhibition of inflammation-induced fever (pyrexia) and the reduction of acute phase reactants (e.g., CRP and ESR). The mechanism effectively targets the molecular signals that induce these systemic reactions, resulting in a shift toward a suppressed inflammatory signal transduction pattern.

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Dosage and Administration Information

Administration Overview

Antril is administered as an injection. The method of administration involves delivering the medication into the subcutaneous tissue, which is the layer of fat located directly under the skin. Common sites for subcutaneous injection include the abdomen, the front of the thighs, or the outer area of the upper arms.

Preparation for Use

Before administration, the medication should be inspected visually. The solution should appear clear and colorless; it should not be used if it is cloudy, discolored, or contains visible particles. To ensure patient comfort, the medication may be allowed to reach room temperature naturally before the injection process begins.

Self-Administration Technique

For those who perform the injection at home, it is important to follow the specific technique provided during clinical training. The injection site should be rotated with each dose to maintain skin health and prevent localized sensitivity. A new, sterile needle and syringe or pre-filled delivery device must be used for every session.

Disposal and Handling

Used needles and syringes must be placed in a puncture-resistant container immediately after use. These containers should be handled according to local protocols for biohazardous waste. The medication should be stored as directed by the pharmacist to maintain its stability until the time of use.

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Recent Clinical Evidence

Research Evidence / Overview of Studies for Antril

Antril (Anakinra) was studied for its use in clinical trials and long-term cohort studies to explore its role in specific inflammatory conditions. Research contributes to characterizing the patterns observed in symptoms, inflammatory markers, and functioning during study periods. Studies explore outcomes related to physical discomfort and systemic or functional imbalance across different patient groups.


Evidence for Use in Cryopyrin-Associated Periodic Syndromes (CAPS)

Research examining the use of Antril in Cryopyrin-Associated Periodic Syndromes (CAPS), which are conditions characterized by fluctuating or episodic manifestations, includes both small initial randomized trials and longer prospective open-label clinical cohort studies. Findings describe patterns observed in these studies where patients reported a change in the speed of systemic symptoms following study initiation. Evidence from follow-up cohorts suggests these patterns were reported as lasting in the small populations observed over defined follow-up periods.


Evidence for Use in Adult-Onset Still's Disease (AOSD)

The evidence base for Antril in Adult-Onset Still's Disease (AOSD) consists primarily of smaller randomized controlled trials (RCTs) and numerous academic studies. Research explored outcomes reflecting daily functioning and systemic inflammation, specifically focusing on whether patients achieved definitions of clinical remission. Studies monitored whether patients who achieved a level of symptomatic control also showed a pattern of glucocorticoid (steroid) dose reduction. However, findings were mixed across all published studies regarding sustained remission.


Evidence for Use in Moderately to Severely Active Rheumatoid Arthritis (RA)

Antril was evaluated in multiple large-scale, pivotal Phase III randomized, placebo-controlled trials (RCTs) for the treatment of moderately to severely active RA. The pivotal RCTs described patterns where a statistically greater proportion of patients achieved the defined symptom response criteria compared to the placebo groups over the short term. Research also provides insight into changes over longer periods, as data show patterns related to a difference in the slowing of joint damage progression between the treated group and the placebo group over the study period.


Research Gaps and Areas of Uncertainty

Evidence highlights what is known — and what is still uncertain. The research has specific limitations, including that the sample sizes were modest for the rare diseases (CAPS and AOSD), which affects the ability to make broad generalizations. Also, follow-up durations were limited in the original controlled trials for all indications, meaning that the full picture of long-term effects are not fully established. Additionally, comparative evidence is lacking for many of the newer treatments that have since become available.

Key Studies & References

  1. Efficacy and Safety of Anakinra in Patients With Rheumatoid Arthritis: Results of a Phase III, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study
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Frequently Asked Questions (FAQ)

Common questions about Antril (FAQ)


Q: How quickly does Antril usually start working?

Studies and official information indicate that patients with CAPS in clinical studies reported observing a rapid change in systemic symptoms after starting treatment. However, the official documents do not provide a universal, defined timeline (such as hours or days) for when the effects are usually noticed for all approved conditions.

Q: What are the most common side effects of Antril?

According to official regulatory documents, the most frequently documented side effects (classified as Very Common, affecting 1 in 10 people or more) are headache and reactions at the injection site, such as redness, swelling, or pain. The product information also classifies serious infections and neutropenia (a reduction in white blood cells) as Common effects (affecting 1 in 100 to 1 in 10 people).

Q: Do the side effects of Antril go away over time?

Regulatory safety data notes a time-related pattern for some effects. For instance, injection site reactions are most frequently observed during the first four weeks of therapy. In contrast, the official information indicates that the incidence of serious infections was observed to remain stable over the study periods during long-term use.

Q: Is it normal to feel [general, non-severe side effect] when first taking Antril?

Regulatory documents classify the common and very common effects, such as injection site reactions and headache, that a user may experience. The official information describes these as possible effects but does not use non-clinical terms to address individual patient feelings.

Q: What happens if I accidentally miss a dose of Antril?

The patient information provided with the product indicates that if a dose is missed, the user should contact their healthcare provider right away. The provider can offer guidance regarding the administration schedule.

Q: Is it safe to use during pregnancy?

Antril is not recommended for use during pregnancy, based on regulatory guidance. Additionally, women of childbearing potential are referenced in official product information as needing to use effective methods of birth control during treatment.

Q: How long after stopping Antril does it stay in my system?

Pharmacokinetic data available in regulatory labeling indicates that the drug has a relatively short terminal half-life, ranging from approximately 4 to 6 hours in patients with Rheumatoid Arthritis. This half-life is the time it takes for the amount of drug in the body to be reduced by half.

Q: Can Antril be crushed or split?

The product is supplied exclusively as a sterile solution in a ready-to-use, pre-filled syringe for subcutaneous injection only. This confirms the medication is only for subcutaneous injection and is not intended for oral use or physical alteration.

Q: What should I do if I think I'm having a severe side effect from Antril?

Official patient information indicates that signs of a serious problem, such as serious infections, severe allergic reaction, or neutropenia, should prompt immediate contact with a healthcare professional. These are listed as potential serious side effects.

Q: How does the effectiveness of Antril change over long periods of use?

Clinical studies have provided insights into patterns observed over time. For Rheumatoid Arthritis, data relates to a slowing of joint damage progression during the study period. For rare diseases like CAPS, long-term follow-up cohorts reported that changes in symptoms were sustained over the observed periods.

Q: Is Antril a long-term or short-term treatment?

The official dosing regimens for chronic inflammatory conditions, such as Rheumatoid Arthritis and Cryopyrin-Associated Periodic Syndromes, involve continuous daily administration. This schedule aligns with the continuous, long-term management required for these chronic conditions.

Q: What is the difference between Antril and [Competitor Drug Name]?

Antril (Anakinra) is classified as a biologic drug and an immunosuppressive agent. Specifically, it works by acting as an Interleukin-1 receptor antagonist, meaning its mechanism is to specifically block the activity of the IL-1 protein, a key inflammatory messenger.

Q: Does Antril help with [specific, general symptom]?

The official mechanism of action is described as resulting in the systemic dampening of the acute phase response. This action translates into the inhibition of inflammation-induced fever (pyrexia) and a reduction in systemic inflammatory markers like CRP and ESR.

Q: Does Antril interact with birth control pills?

Official labeling notes a potential for interaction involving liver enzymes. Because Antril can reverse inflammation-induced suppression of drug-metabolizing enzymes (CYP450), the effectiveness of co-administered hormonal contraceptives that are sensitive to these enzymes may change. This may require monitoring.

Q: Can Antril cause problems with my liver?

Regulatory documentation lists elevated hepatic enzymes (liver enzymes) as an uncommon adverse reaction (affecting 1 in 100 to 1 in 1,000 people). Caution is formally advised when prescribing the medication to patients who already have severe hepatic impairment.

Q: Who cannot use Antril?

Use of Antril is formally restricted or contraindicated in several populations. These include patients with a known hypersensitivity to the medicine, those with an active infection, or individuals whose Absolute Neutrophil Count (a type of white blood cell count) falls below a specific threshold.

Q: Is Antril safe for people over 65?

The official prescribing information does not restrict the use of Antril based purely on age. However, caution is referenced in the official prescribing information for use in the elderly population.

Q: Do I need to take Antril at a specific time of day?

The administration instructions state that for consistency, the dose should be administered at approximately the same time each day. No specific time (such as morning or evening) is mandatory in the official labeling.

Q: Is Antril available over the counter in some countries?

Antril is a biologic drug and an immunosuppressive agent approved for the treatment of specific chronic conditions. Due to its classification and method of use, it requires a prescription from a licensed healthcare provider.

Q: Does Antril affect my immune system?

Yes, Antril is classified as an immunosuppressive agent. Its mechanism is designed to reduce chronic inflammation by blocking an Interleukin-1 signal, which in turn dampens the inflammatory process and can affect the body’s ability to mount an immune response to infections.

Q: Why is Antril sometimes prescribed with another medication?

Official documentation indicates that Antril is approved to be used either alone or in combination with other disease-modifying antirheumatic drugs (DMARDs) for conditions like Rheumatoid Arthritis. However, it should not be used in combination with certain other classes of medication, such as TNF-blocking agents.

Q: Does the efficacy of Antril depend on age or gender?

Clinical trial data confirms that Antril is approved for use across both adult and pediatric patient populations, depending on the condition. Additionally, pharmacokinetic studies documented in regulatory labeling indicate that gender and age generally were not found to be significant factors affecting the clearance of the drug from the body.

Q: Is it possible to be allergic to Antril?

Yes, it is possible. Antril is formally contraindicated for use in patients with a known hypersensitivity to the medicine or its components, including proteins derived from E. coli. Regulatory documents also mention that allergic reactions, including rare instances of anaphylaxis, have been reported.

Q: What is the difference between Antril and the placebo in studies?

The pivotal randomized, placebo-controlled trials described clear patterns of difference in patient response. A statistically greater proportion of patients achieved the defined symptom response criteria in the Antril group compared to the placebo group over the short term.

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How should Antril be stored and disposed of?

How to Store and Dispose of Antril (Anakinra)

Antril (Anakinra) is a biologic drug that requires strict adherence to cold chain and handling instructions to maintain its integrity.


Storage Requirements

Antril must be stored in a refrigerator at a temperature between 2 C and 8 C (36 F and 46 F). The syringes must be kept in their original carton to protect the solution from light. It is mandatory not to freeze the product and not to shake the syringe. The medicine must be kept out of the sight and reach of children.

Stability and Disposal

The product is for single use only. If removed from the refrigerator, it may be kept at room temperature (up to 25 C) for a limited time, such as a maximum of 72 hours (EMA) or 12-24 hours (FDA), after which it must be discarded. Used, single-use syringes and needles must be disposed of immediately in a puncture-resistant sharps container. Unused medicine must be discarded according to local regulatory requirements.

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

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