What to Know About Olumiant (Baricitinib)

A JAK Inhibitor to Treat Rheumatoid Arthritis and Other Inflammatory Conditions

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Olumiant (baricitinib) is an oral drug approved in 2018 by the Food and Drug Administration (FDA) for the treatment of adults with rheumatoid arthritis (RA).

Olumiant belongs to a relatively new drug class known as Janus kinase (JAK) inhibitors. These drugs block a group of complex signaling pathways in the body, interfering with signaling pathways and cellular processes that contribute to RA, inflammation, and several inflammatory diseases.


Olumiant is primarily used to treat rheumatoid arthritis, a chronic inflammatory autoimmune disease that mainly affects joints, including the hands and feet.

Specifically, it is approved for people with moderate or severe disease who have not responded well to methotrexate or tumor necrosis factor (TNF) inhibitor therapies.

In June 2022, the FDA approved Olumiant for the treatment of adults with severe alopecia areata (patchy baldness). It is the first systemic treatment approved for alopecia areata. Olumiant is also approved for the treatment of COVID-19 in certain hospitalized adults.

Mature Doctor examining a Rheumatoid Arthritis patient
 SoumenNath/ E+/ Getty Images

Off-Label Uses

Because Olumiant works to tamp down inflammation generally, it has potential uses for many different medical conditions. For example, some evidence suggests that Olumiant may be helpful for people with atopic dermatitis (commonly known as eczema). It has also been used to treat rare genetic autoinflammatory diseases as well as other inflammatory conditions.

Olumiant hasn’t gone through the full set of definitive studies of effectiveness required for FDA approval for these conditions. However, your healthcare provider might still prescribe Olumiant if there aren’t any good alternatives for treatment and preliminary information suggests that the drug may be effective.

Before Taking

Though Olumiant is approved for treating RA, it is not recommended as the first option. Instead, it may be used if other options have not worked well.

Your clinician will need to give you a thorough medical evaluation before starting Olumiant. You’ll need to talk about any current symptoms you are having. You’ll also need to talk about your medical history. It’s important that your healthcare professional make sure that you don’t have any other conditions that make taking Olumiant medically risky.

To help with evaluating this, you’ll probably need to get certain tests before you start. This might include:

  • Tests for tuberculosis (such as skin test or X-ray)
  • Complete blood count (to check for anemia and low white blood cells)
  • Blood tests for kidney disease
  • Blood tests for liver disease
  • Blood tests for lipids

While you continue your treatment, you may need some of these tests repeated, to make sure Olumiant is still a safe choice for you.

Your healthcare provider might also want to check your vaccine history before starting Olumiant. It’s not recommended that people get certain types of vaccines, called “live vaccines,” while taking the drug. So if you need one of these types of vaccines (such as the vaccine for shingles) you might want to get it before you start treatment.

Precautions and Contraindications

If you have signs or symptoms of an active infection, you should wait to start Olumiant. People with anemia should wait to start as well if their hemoglobin is 8 grams per deciliter (g/dl) or lower.

If your white blood cells are low for some reason, you also might need to defer treatment. If you have tuberculosis, you’d need to get treatment before taking Olumiant.

It’s not recommended that Olumiant be taken if you have severe liver disease. It is also not recommended for people with moderate or severe kidney disease. Olumiant should be used with caution if you have a medical condition that increases your risk of blood clots or one that increases your risk of gastrointestinal perforation (like diverticulitis).

It is not recommended that Olumiant be taken along with other JAK inhibitors or with biologic treatments for rheumatoid arthritis (like Enbrel). It also should not be taken with certain drugs that strongly affect the immune system, such as azathioprine and cyclosporine.

Certain types of drugs known as OAT3 inhibitors should also be avoided if you are using Olumiant. The most common example is probenecid, a treatment sometimes used to treat gout.

The potential risks during pregnancy while taking Olumiant are not clear, but caution is warranted. It’s recommended that breastfeeding not take place while on the drug.

Other Janus Kinase Inhibitors

Olumiant isn’t the only drug available in its drug class. For example, Rinvoq (upadacitinib) and Xeljanz(tofacitinib) are two other similar JAK kinase drugs approved to treat moderate to severe rheumatoid arthritis.

However, even though they are similar drugs, they don’t affect exactly the same enzymes, and you might not have the same response to them.

Research shows that there's an increased risk of heart-related events, like heart attack or stroke, in addition to blood clots, cancer, and death with the use of Olumiant, Xeljanz, or Rinvoq. Be sure to talk with your doctor to ensure these JAK inhibitors are a safe option for you.

Other Therapies for Moderate to Severe Rheumatoid Arthritis

If you’ve tried TNF-inhibitors, a JAK inhibitor like Olumiant is a reasonable choice. However, there are other options. In addition to TNF-inhibitors, other biologic treatments are available to treat rheumatoid arthritis.

Therapies such as Orencia (abatacept) or Actemra (tocilizumab) might be reasonable alternatives. Unlike almost all biologic therapies that must be given by injection or infusion, Olumiant is a pharmaceutical drug that can be taken by mouth.


Olumiant is usually taken in doses of 2 milligrams (mg) per day, given through a single tablet. In some cases, you might be prescribed a dose of 4 mg daily instead. Check with your healthcare provider to make sure you are taking your correct dose.

The medication can be stored at room temperature. It can be taken with or without food. If you miss a dose, don’t double up the next one. If you accidentally take more than recommended, call your healthcare provider's office for advice.

Olumiant can be taken as your only rheumatoid arthritis treatment. However, it can also be combined with certain medications, such as methotrexate. 

Side Effects

Olumiant can cause symptoms from upper respiratory tract infections, like sore throat or a runny nose. Nausea is another possible side effect.

Uncommonly, people taking Olumiant have reported skin symptoms related to herpes simplex, like skin sores. It can also cause reactivation of the herpes zoster virus, leading to painful symptoms of shingles.

Olumiant also sometimes causes increases in lipids like cholesterol and increases in certain tests related to the liver. You might not notice direct symptoms from these, but they may impact your treatment plan moving forward.


Uncommonly, Olumiant has been associated with severe problems. These include:

  • Gastrointestinal perforation
  • Serious Infection
  • Blood clots
  • Interstitial lung disease
  • Lymphomas and other malignancies


The information released by the FDA about Olumiant includes black box warnings about an increased risk of malignancy (especially lymphoma and lung cancer), an increased risk of thrombosis and severe cardiovascular events, and an increased risk of serious infections.

Risk of Malignancy

The warning about an increased risk of cancer was based on information from early studies about Olumiant. However, researchers dispute whether there really is an increased risk.

Rheumatoid arthritis itself carries an increased risk of certain cancers, particularly lymphoma, compared to the general population, which makes it more challenging to get an understanding of true increases in risk.

Risk of Thrombosis

Another important risk is the potential for thrombosis, a blood clot that might block a vessel in part of your body. Olumiant does appear to increase the risk of a blood clot, such as a pulmonary embolism or a deep vein thrombosis. Although uncommon, this risk should be taken seriously.

If you have symptoms like sudden shortness of breath, seek immediate medical attention. You might have a pulmonary embolism, a potentially life-threatening condition. Likewise, seek medical attention promptly if you have warmth and swelling of your leg. These might be symptoms of a deep vein thrombosis.

Increased Risk of Infection

Olumiant also causes an increased risk of infection. For example, you might be more likely to get an unusual fungal infection that most people wouldn’t have trouble with. You might also be more likely to get certain kinds of viral and bacterial infections than if you weren’t taking the drug.

However, this increased risk appears to be comparable to the risk of infection caused by biologic therapies for rheumatoid arthritis, like TNF-inhibitors.

A Word From Verywell

Like all drugs, Olumiant has its risks and its potential benefits. It might or might not make sense for you based on your disease severity and treatment history, your other medical conditions, and your personal preferences. Talk to your healthcare provider about your particular situation to make the best choice for you. 

11 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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By Ruth Jessen Hickman, MD
Ruth Jessen Hickman, MD, is a freelance medical and health writer and published book author.