Baricitinib

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Baricitinib

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Baricitinib

Quick Facts About Baricitinib

Property Description
Active ingredient Baricitinib (INN)
Form Film-coated tablet (Oral)
Pharmacological class Janus Kinase (JAK) Inhibitor
General Purpose Immunomodulation and inflammation control
Origin Chemically synthesized (Small molecule)

What Type of Medicine Is Baricitinib?

Baricitinib is an active pharmaceutical ingredient, formally known by its International Nonproprietary Name (INN: Baricitinib). It is a Janus Kinase (JAK) inhibitor and is classified as a targeted synthetic disease-modifying anti-rheumatic drug (tsDMARD). It is typically supplied as a film-coated tablet for oral use.

A unique differentiating feature is its nature as a small-molecule drug, which is chemically synthesized. This characteristic allows Baricitinib to be conveniently taken by mouth, offering an oral alternative to large, injected biologic therapies.


Is Baricitinib Synthetic or Naturally Derived?

Baricitinib is a chemically synthesized compound; its structure is entirely manufactured in a laboratory, and it is not derived from natural organisms or living cells. This synthetic origin ensures the consistency and purity of the active substance (C16H17N7O2S) in every dose.

Baricitinib is a prescription-only (Rx) medication across major markets, signifying its use as a targeted therapy requires careful medical supervision.


What Is the General Therapeutic Purpose of Baricitinib?

The primary therapeutic goal of Baricitinib is to selectively modulate an overactive immune system to help control underlying chronic inflammation. By inhibiting specific enzymes known as Janus Kinases, the medicine is recognized for its ability to limit the body’s inappropriate inflammatory signaling.

Baricitinib has the ability to help decrease overall disease activity. This targeted action is intended to achieve sustained disease control, which can lead to measurable improvements in physical function and quality of life.

Regulatory References

  1. NIH: Baricitinib in Rheumatoid Arthritis

What side effects are possible with Baricitinib?

Baricitinib's official safety profile, as documented by regulatory authorities, communicates possible adverse reactions primarily through frequency classifications and the body system affected. Common adverse reactions (occurring in 1% to 10% of patients) include upper respiratory tract infections (URTIs), headaches, nausea, and specific laboratory changes such as elevated blood cholesterol (hyperlipidaemia) and temporary increases in liver enzymes.

The medicine is associated with a risk of Serious Adverse Reactions highlighted in the official prescribing information. These severe, documented risks include the potential for serious infections, including opportunistic pathogens and tuberculosis reactivation. Furthermore, the regulatory labeling documents an increased risk of Major Adverse Cardiovascular Events (MACE), such as heart attack and stroke, and an increased risk of malignancy and thrombosis (e.g., Deep Venous Thrombosis and Pulmonary Embolism).

Adverse reactions are formally grouped into System-Organ Classes, such as Infections and Infestations, Blood and Lymphatic System Disorders, and Gastrointestinal Disorders. Uncommon reactions, for instance, include events such as gastrointestinal perforation and Lymphopenia (decreased lymphocyte count).

Specific safety constraints are documented for certain populations: the medicine is generally not recommended for use in individuals with severe hepatic impairment or severe renal impairment. The official label also advises against the co-administration of Baricitinib with live vaccines or other potent immunosuppressants.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation for Baricitinib (Olumiant) provides specific, mandated actions for managing an overdosage, emphasizing continuous monitoring and supportive care.

Entity Regulatory Statement
Documented Overdose Manifestations Signs and symptoms of adverse reactions (Only stated as the object of monitoring; no specific, unique overdose symptoms are listed.)
Emergency-Response Statements The patient should be monitored for signs and symptoms of adverse reactions.

When an overdose is suspected, the required action is to seek immediate medical attention for professional clinical monitoring. The regulatory profile does not define a specific symptom cluster for an acute Baricitinib overexposure; instead, it mandates that patients be observed for the development of any generalized adverse reactions. Patients who develop adverse reactions are required to receive appropriate treatment.

Concerning intervention, the official labeling confirms that no specific antidote is known for Baricitinib overdosage. Management is therefore strictly supportive. Due to the drug’s pharmacokinetic properties, Haemodialysis may be considered as a procedural measure to accelerate the elimination of the active substance from the systemic circulation, with clinical data indicating that approximately 35% of the dose can be removed during a four-hour session. This approach confirms that the overdose profile is primarily managed through professional supportive procedures and sustained clinical observation.

Therapeutic Uses of Baricitinib

Main Uses and Benefits of Baricitinib

Baricitinib is a medication used to manage several distinct inflammatory and autoimmune conditions. It works by interfering with specific signaling pathways in the body that contribute to inflammation and immune system overactivity.

Rheumatoid Arthritis

In adults with moderate to severe rheumatoid arthritis, baricitinib is used when other treatments have not provided an adequate response or were not tolerated. The medication aims to reduce the symptoms associated with the condition, such as:

  • Joint pain and swelling: By targeting inflammatory processes, it helps alleviate physical discomfort.
  • Joint stiffness: It can improve mobility, particularly the stiffness often experienced in the morning.
  • Structural damage: Treatment may help slow the progression of joint damage, preserving long-term physical function.

Atopic Dermatitis

Baricitinib is utilized for the treatment of moderate to severe atopic dermatitis (eczema) in patients who are candidates for systemic therapy. Its primary benefits in this area include:

  • Reduction of skin inflammation: Helping to clear the redness and rash associated with eczema flares.
  • Itch relief: One of the most significant benefits is the reduction of pruritus (itching), which often improves sleep quality and daily comfort.
  • Skin barrier improvement: By controlling underlying inflammation, the medication helps the skin heal and maintain its integrity.

Alopecia Areata

Baricitinib is the first systemic treatment approved for severe alopecia areata, an autoimmune condition that causes patchy or complete hair loss. The treatment focuses on:

  • Hair regrowth: Stimulating the recovery of hair on the scalp, eyebrows, and eyelashes.
  • Immune modulation: Preventing the immune system from attacking hair follicles, allowing for a sustained growth cycle.

COVID-19 Treatment

In specific clinical settings, baricitinib is used to treat hospitalized adults requiring supplemental oxygen or mechanical ventilation due to COVID-19. Its role in this context is to:

  • Moderate the hyperinflammatory response: Helping to control the "cytokine storm" that can lead to severe lung injury.
  • Improve clinical outcomes: Supporting the recovery process and reducing the duration of hospitalization for severely ill patients.

Regulatory References

  1. European Medicines Agency (EMA) overview

Eligibility and Restrictions for Use

Baricitinib's eligibility profile is strictly defined by regulatory authorities to classify who may and may not use the medicine. The medicine is contraindicated and must not be used by patients with a known hypersensitivity to the active substance or by pregnant women. Females of childbearing potential are required to use effective contraception during and for at least one week after treatment.

Use is approved for adults (18 years and older) across authorized indications. For pediatric populations, the medicine is approved for children 2 years of age and older with active Juvenile Idiopathic Arthritis or moderate to severe Atopic Dermatitis, but safety and efficacy have not been established in children younger than two years.

The regulatory labeling states that Baricitinib is not recommended for patients with Severe Renal Impairment or Severe Hepatic Impairment. Furthermore, treatment must not be initiated if a patient's Absolute Lymphocyte Count, Absolute Neutrophil Count, or Haemoglobin falls below specific critical laboratory thresholds. Use in patients 65 years of age or older or those with a history of malignancy or cardiovascular risk factors is restricted to situations where no suitable treatment alternatives are available. The medicine is also not recommended in combination with other JAK inhibitors or biologic DMARDs.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents define Baricitinib's interaction profile based on specific restrictions for co-administration. Co-treatment is not recommended with other Janus Kinase (JAK) Inhibitors, biologic Disease-Modifying Anti-Rheumatic Drugs (DMARDs), or potent immunosuppressants such as Azathioprine and Cyclosporine, due to the risk of additive immunosuppression.

Furthermore, the use of live, attenuated vaccines should be avoided because of the potential for the drug’s immunomodulatory effects to reduce vaccine response.

Pharmacokinetic and Transporter Interactions

Baricitinib is officially documented as a substrate for the Organic Anion Transporter 3 (OAT3). Co-administration with strong OAT3 Inhibitors, specifically Probenecid, causes an approximately two-fold increase in Baricitinib plasma exposure (AUC). This documented effect is associated with a formal regulatory requirement for dosage adjustment in this specific patient population.

Co-administered Product Category Official Regulatory Classification/Effect
Strong OAT3 Inhibitors (e.g., Probenecid) Increases Exposure (requires dose modification)
CYP Enzyme Inhibitors (3A4, 2C19, 2C9) No clinically relevant effect on concentration
Food May be taken with or without food (no clinically relevant effect)

Mechanism of Action

Targeted Inhibition of Janus Kinase (JAK) Enzymes

Baricitinib is a small molecule that acts as a selective and reversible inhibitor of intracellular Janus Kinase (JAK) enzymes, primarily targeting JAK1 and JAK2. This mechanism acts within the cell’s cytoplasm to block the catalytic activity of these specific enzymes, thereby interrupting a key step in the intracellular signaling chain for many immune mediators.


Disruption of the JAK-STAT Signaling Pathway

By inhibiting JAK activity, the drug directly interferes with the JAK-STAT signaling pathway, which transmits signals initiated by various pro-inflammatory cytokines (like IL-6 and Interferon-gamma). This interference prevents the phosphorylation and activation of STAT proteins, which are necessary for regulating gene expression.


Physiological Modulation of Inflammation and Immune Function

The molecular blockade prevents STAT proteins from entering the cell nucleus to transcribe genes for inflammatory proteins. This sequence results in a functional modulation of immune cell activity and proliferation, leading to a change in the cellular signaling dynamics marked by a reduction in the production of systemic inflammatory mediators. The mechanism also modulates neuroimmune signaling by blocking cytokine-dependent activity within neuronal pathways.

Dosage and Administration Information

Baricitinib is used as an oral medication, typically supplied as a film-coated tablet in strengths of 1 mg, 2 mg, and 4 mg. The standard route of administration is by swallowing the tablet whole; however, the tablet can be dispersed in plain water for patients who are unable to swallow, or for administration via an enteral tube.

The medicine follows a once-daily dosing schedule for all approved indications. It can be taken at any time of the day and is independent of meals, meaning it can be taken with or without food. Dosing regimens vary based on the clinical context: for chronic conditions, the typical daily dose is either 2 mg (maintenance) or 4 mg (initial or higher dose), with a plan for dose reduction upon achieving sustained disease control. Conversely, use in hospitalized patients for severe viral illness is limited to a fixed duration of 14 days or until hospital discharge.

Usage instructions require dose adjustments based on a patient’s physiological state. For instance, the dose is reduced to 1 mg once daily for patients with moderate renal impairment (eGFR 30–<60 mL/min/1.73 m^2), and its use is generally not recommended in cases of severe impairment or severe hepatic impairment. A 50% dose reduction is also required when Baricitinib is co-administered with a strong OAT3 inhibitor. If a dose is missed, patients should take it as soon as possible, but must not take two doses at the same time to compensate for the omission.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Baricitinib

The research on Baricitinib has involved several large-scale studies, primarily Randomized Controlled Trials (RCTs), which are considered a primary method for assessing medical evidence in authoritative sources. The goal of this overview is to explain, in plain language, what has been studied, what has been reported so far, and what aspects remain uncertain across its different applications.


Evidence for Use in Moderately to Severely Active Rheumatoid Arthritis

Research exploring outcomes for active Rheumatoid Arthritis (RA) has largely relied on double-blind RCTs comparing groups against a placebo or other approved medicines. These studies involved adults who had not responded adequately to prior conventional treatments. Researchers monitored outcomes related to disease activity scores (like the ACR criteria), functional limitations, and structural joint status over the study period.

The clinical trials reported measurements showing patterns of change in disease activity scores across multiple time points. Evidence is limited for direct, head-to-head comparative research against all other targeted therapies used in RA, and long-term outcomes for certain patient subgroups are continuously being characterized through ongoing post-marketing studies.


Evidence for Use in Severe Alopecia Areata

The evidence for severe Alopecia Areata (AA) is built primarily upon large, Phase 3 RCTs. These studies examined outcomes related to hair regrowth in adults and adolescents with significant scalp hair loss (defined as at least 50% loss). The main outcome measured was the SALT score, which assesses the amount of hair coverage on the scalp.

Trials reported findings describing patterns observed in the studies related to achieving specific amounts of scalp hair coverage at defined time points. Evidence remains limited concerning the durability of outcomes after the treatment is discontinued, and comparative research against other systemic treatments for AA is also lacking.


Evidence in Acute Hospitalized Care (COVID-19)

Research for COVID-19 focused on hospitalized patients with severe illness who required supplemental oxygen or more intensive support, such as mechanical ventilation. These were short-term, acute care studies that examined outcomes related to all-cause death (mortality) and the progression to, or use of, mechanical ventilation at defined time points. Research is ongoing and primarily focused on the acute phase of illness; evidence is limited to this specific hospitalized population.

Frequently Asked Questions (FAQ)

Common questions about Baricitinib (FAQ)


Q: What is Baricitinib prescribed for, besides rheumatoid arthritis?

A: Regulatory documents indicate that Baricitinib is approved for conditions beyond rheumatoid arthritis. These uses include treating severe alopecia areata (an autoimmune hair loss condition) and for certain hospitalized patients with COVID-19 who require supplemental oxygen.


Q: Is Baricitinib the same type of medication as other drugs used for the same condition?

A: Baricitinib is a small-molecule drug that belongs to a class of medicines called Janus kinase (JAK) inhibitors. This class works by blocking specific enzymes in the body involved in inflammatory and immune responses.


Q: How quickly does Baricitinib typically start to show an effect?

A: Official information from clinical studies indicates that Baricitinib can start to reduce signs of inflammation, such as C-reactive protein (CRP) levels, within one week of starting treatment. Clinical improvement for chronic conditions is typically assessed by clinicians after about 12 weeks of use.


Q: Are there any long-term effects associated with taking Baricitinib?

A: Official risk management documents state that long-term safety is an area of 'missing information' and is still under active study. Studies continue to monitor for potential risks associated with prolonged periods of use.


Q: Is it true that Baricitinib can increase the risk of getting sick?

A: Yes, official labeling, including a Boxed Warning, advises that Baricitinib may lower the ability of the immune system to fight infection. This reduction in immune system function is associated with an increased risk of developing serious infections.


Q: What are the most commonly reported side effects of Baricitinib?

A: According to official product information, the most commonly reported side effects in clinical trials (affecting more than 1 in 10 people) are upper respiratory tract infections (like the common cold) and an increase in blood cholesterol levels.


Q: Do you have to get regular lab tests while taking Baricitinib?

A: Regulatory guidelines advise that certain laboratory tests must be performed before starting treatment and periodically throughout therapy. This monitoring typically checks for changes in blood counts, liver enzymes, and lipids (cholesterol).


Q: Is Baricitinib considered a biological drug?

A: No, Baricitinib is classified as a small-molecule drug, which means it is chemically synthesized. Biological drugs are typically complex proteins produced using living organisms.


Q: How is Baricitinib different from other JAK inhibitors?

A: Baricitinib selectively targets the Janus kinase (JAK) enzymes, primarily focusing on JAK1 and JAK2. Different JAK inhibitors may have varying selectivity profiles within this enzyme family.


Q: Can Baricitinib interact with common over-the-counter pain relievers?

A: Official warnings regarding interactions focus on specific strong inhibitors, such as OAT3 inhibitors, which require a dose adjustment. Common over-the-counter pain relievers are not specifically detailed in the official warnings.


Q: What are the main things to avoid while taking Baricitinib?

A: Official documents advise that the use of live vaccines should be avoided immediately before or during treatment. Additionally, co-administration with other immunosuppressive biologic drugs or strong immunosuppressants is generally not recommended.


Q: Is there a link between Baricitinib and serious heart-related issues?

A: Official labeling includes a Boxed Warning about a higher rate of major adverse cardiovascular events (MACE), including heart attack and stroke. This risk was observed with JAK inhibitors in specific at-risk patients (aged 50 years or older with cardiovascular risk factors).


Q: How long is a person expected to continue taking Baricitinib treatment?

A: The expected duration of treatment depends on the condition being addressed. For chronic conditions, it may be prescribed for long-term use; for acute viral illnesses, the use is limited to a short duration, such as up to 14 days or until hospital discharge.


Q: Can people with a history of certain cancers use Baricitinib?

A: Official labeling includes a Boxed Warning regarding the risk of malignancies (cancers). The decision to start treatment is typically made on an individual basis, especially for patients with a known history of cancer.


Q: What research evidence supports the use of Baricitinib for its main indications?

A: The regulatory documents contain a dedicated section summarizing the clinical trials and data that were submitted and reviewed to support the drug’s approved uses. This evidence includes studies demonstrating efficacy measures like the ACR response in rheumatoid arthritis.


Q: Why do doctors prescribe Baricitinib for some conditions but not others?

A: Baricitinib is prescribed only for the specific conditions for which it has received official regulatory approval (indications). This approval is granted only after a review of supporting clinical data demonstrates a favorable balance of benefits and risks for that condition.


Q: Does Baricitinib cause weight gain or weight loss?

A: Official information indicates that weight gain has been listed as a reported adverse reaction in clinical studies for some approved uses.


Q: Can women who are planning a pregnancy use Baricitinib?

A: Based on animal studies, Baricitinib may cause fetal harm. Official guidance recommends that women who may become pregnant should use effective contraception during treatment and for a specified time (e.g., at least 1 week) after the last dose.


Q: Does Baricitinib interfere with any common vaccines?

A: Official documents advise that the use of live vaccines should be avoided during treatment with Baricitinib.


Q: What are the signs of a serious allergic reaction to Baricitinib?

A: Serious allergic reactions (hypersensitivity) have been reported. Signs can include swelling of the face, lips, tongue, or throat, rash, or hives. If these occur, emergency medical attention should be sought.


Q: Is Baricitinib a drug that suppresses the immune system?

A: Yes, Baricitinib is an immunosuppressant medicine. It works by blocking the action of Janus kinase enzymes, thereby reducing the inflammatory and immune activity that contributes to certain diseases.


Q: How does Baricitinib fit into the overall treatment plan for severe alopecia areata?

A: Baricitinib is approved as a treatment for severe alopecia areata. For patients who show an adequate response, the regulatory guidance allows for a dosage adjustment after a period of use.


Q: What are the known drug interactions listed in the official documents for Baricitinib?

A: The official label specifies interactions that require a dose adjustment, such as the co-administration with strong OAT3 inhibitors (a type of drug that affects how the body processes Baricitinib). Dose adjustment is required when taking these specific interacting medicines.


Q: Can Baricitinib be used in children or adolescents?

A: Yes, Baricitinib is approved for use in certain pediatric patients for conditions like juvenile idiopathic arthritis (JIA) and atopic dermatitis (AD) starting from a specific age, as detailed in the official product information.


Q: What is the active ingredient in the medication Baricitinib?

A: The active substance in the medicine is called baricitinib. This ingredient is responsible for the drug's intended action of selectively inhibiting the Janus kinase (JAK) enzymes.


Q: Can Baricitinib affect blood pressure or cholesterol levels?

A: Baricitinib may cause an increase in blood cholesterol levels (hyperlipidemia), which is a commonly reported side effect. Patients may be monitored for changes in lipids and other laboratory values during treatment.


Q: Does Baricitinib require a special prescription or monitoring program?

A: Regulatory guidelines advise a special evaluation for conditions like tuberculosis (TB) and Hepatitis B prior to starting treatment. Continued laboratory monitoring is also required during therapy.


Q: Are headaches a common side effect of Baricitinib?

A: Yes, headache is listed as a common side effect in the official documents for Baricitinib, meaning it has been reported to affect up to 1 in 10 people in clinical trials.


Q: Are there dietary restrictions required when taking Baricitinib?

A: Official administration instructions state the medicine can be taken with or without food. There are no widely documented dietary restrictions listed in the major official product documents.


Q: What are the official sources for safety information regarding Baricitinib?

A: Official safety information can be found in government-issued documents. These sources include the FDA Prescribing Information (or DailyMed) in the U.S. and the EMA Summary of Product Characteristics (SmPC) in Europe.


Q: Is Baricitinib approved for use in all countries for the same conditions?

A: No, regulatory approvals can differ between countries. The specific conditions Baricitinib is approved to treat may vary between different national or regional regulatory bodies (e.g., the U.S. FDA versus the European EMA).


Q: Does Baricitinib have a Black Box Warning, and what does it mention?

A: Yes, the FDA labeling contains a Boxed Warning that highlights serious risks. These risks include serious infections, increased risk of mortality, malignancy (cancer), major adverse cardiovascular events (MACE), and thrombosis (blood clots).


Q: What diseases or conditions must a person NOT have to be eligible for Baricitinib?

A: Official guidance states that use is generally not recommended in patients with an active tuberculosis (TB) infection, severe liver impairment, or severe kidney impairment (eGFR <30 mL/min/1.73 m^2).


Q: Can Baricitinib be used by elderly patients?

A: Regulatory documents, such as the EMA SmPC, note that use should be considered carefully for patients aged 65 years or older or those with existing cardiovascular risk factors.


Q: Is there any evidence about Baricitinib's effectiveness in patients who failed other treatments?

A: Yes, for conditions such as rheumatoid arthritis, Baricitinib is specifically indicated for adult patients who have not responded adequately to one or more previous disease-modifying anti-rheumatic drugs (DMARDs).

How should Baricitinib be stored and disposed of?

How to Store and Dispose of Baricitinib (Olumiant)

Storage Requirements

Baricitinib tablets must be stored at room temperature, kept below 30°C (86°F), and protected from moisture and excessive heat. To maintain product integrity, the medicine must remain in its original container with the lid tightly closed. For safety, always store the tablets out of the sight and reach of children.

Handling and Disposal

If a tablet is dispersed in water for alternative administration, the resulting liquid suspension must be used within four hours of preparation. Any remaining suspension should be discarded after this time limit. Unused, expired, or no longer needed Baricitinib should be disposed of in accordance with local laws and regulations for pharmaceutical waste.

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

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