abatacept vs leflunomide
Side-by-side comparison of abatacept and leflunomide Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Orencia
Arava
Orencia is a medicine that helps to reduce inflammation. It is used to treat rheumatoid arthritis, juvenile idiopathic arthritis, and psoriatic arthritis.
Leflunomide is a drug that can help reduce the symptoms of rheumatoid arthritis. It works by slowing down the body's immune system.
Orencia treats rheumatoid arthritis in adults. It also treats polyarticular juvenile idiopathic arthritis in patients 2 years and older. Orencia can also treat active psoriatic arthritis in patients 2 years and older. Finally, it can prevent acute graft versus host disease after a stem cell transplant.
Leflunomide treats active rheumatoid arthritis in adults. Rheumatoid arthritis is a disease that causes pain, swelling, and stiffness in the joints. This medicine can help reduce these symptoms.
Orencia works by blocking the activity of certain immune cells called T cells. These T cells can cause inflammation and damage to your joints and other tissues. By blocking T cell activity, Orencia can help reduce inflammation and relieve your symptoms.
Leflunomide is a pyrimidine synthesis inhibitor. This means it blocks a certain process in your body. By blocking this process, it can reduce inflammation and slow down the damage to your joints.
- • Headache
- • Upper respiratory tract infection (like a cold)
- • Runny nose
- • Nausea
- • Diarrhea
- • Respiratory infection
- • Nausea
- • Headache
- • Rash
- The medicine is not working 38,612
- Rheumatoid arthritis 23,596
- Pain 21,295
- Joint pain 20,151
- Swollen joint 19,709
- The medicine is not working 36,982
- Rheumatoid arthritis 24,921
- Pain 20,055
- Joint pain 16,943
- Cannot tolerate the medicine 15,586
Using Orencia with a TNF antagonist or other biologic medicines can raise your risk of serious infections. Tell your doctor if you have any signs of infection, such as fever, cough, or sore throat. Orencia can also cause allergic reactions, including anaphylaxis. Get medical help right away if you have trouble breathing, swelling, or hives.
This drug can cause serious harm to an unborn baby. If you are pregnant or could become pregnant, you should not take this medicine. This drug can also cause serious liver problems. If you have liver problems, you should not take this medicine. Your doctor will monitor your liver with blood tests.
There is not enough information about Orencia use in pregnant women to know if it is safe. Talk to your doctor if you are pregnant, plan to become pregnant, or are breastfeeding.
Do not take leflunomide if you are pregnant. It can cause birth defects. If you are breastfeeding, you should stop while taking this medicine.
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How to Read This abatacept vs leflunomide Comparison
abatacept is classified in the T-Cell Co-Stimulation Modulator drug class, while leflunomide sits within the Disease-Modifying Antirheumatic Drug (DMARD) class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, abatacept has 123,363 submissions while leflunomide has 114,487. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between abatacept and leflunomide — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.