abatacept vs adalimumab
PlainMeds reviewed this comparison against our methodology in August 2026. It places FDA and CMS record fields side by side, without recommending either medication.
Side-by-side comparison of abatacept and adalimumab. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
moderate Known Drug Interaction
7 DRUG INTERACTIONS • Abatacept: Increased risk of serious infection. 7.2 Biological Products In clinical studies in patients with RA, an increased risk of serious infections has been observed with the combination of TNF blockers with anakinra or abatacept, with no added benefit; therefore, use of IDACIO with abatacept or anakinra is not recommended in patients with RA [see Warnings and Precautions ( 5.7 , 5.11 )] . Concomitant administration of IDACIO with other biologic DMARDS (e.g., anakinra and abatacept) or other TNF blockers is not recommended based upon the possible increased risk...
Orencia
Humira
Orencia is a medicine that helps to reduce inflammation. It is used to treat rheumatoid arthritis, juvenile idiopathic arthritis, and psoriatic arthritis.
Idacio is a medicine that blocks a protein called TNF. It is used to treat several diseases, including arthritis and Crohn's disease.
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.
Idacio can help adults with rheumatoid arthritis by reducing joint pain and damage. It can also help children (2 years and older) with juvenile idiopathic arthritis. Idacio treats psoriatic arthritis, ankylosing spondylitis, Crohn’s disease, ulcerative colitis, plaque psoriasis, hidradenitis suppurativa and uveitis.
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.
Idacio works by blocking a protein in your body called tumor necrosis factor (TNF). TNF can cause inflammation and damage in certain diseases. By blocking TNF, Idacio can reduce these symptoms.
- • Headache
- • Upper respiratory tract infection (like a cold)
- • Runny nose
- • Nausea
- • Infections (like colds or sinus infections)
- • Injection site reactions (redness, itching, pain, or swelling)
- • Headache
- • Rash
- Rheumatoid Arthritis 23,596
- Pain 21,295
- Arthralgia 20,151
- Joint Swelling 19,709
- Fatigue 14,200
- Pain 49,062
- Arthralgia 48,039
- Injection Site Pain 47,251
- Fatigue 39,111
- Rheumatoid Arthritis 35,573
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.
Idacio can increase your risk of serious infections that could lead to hospitalization or death. Tell your doctor if you have any infections before starting Idacio. Idacio may also increase your risk of certain cancers, including lymphoma. Children and teens taking TNF blockers like Idacio have developed rare, aggressive cancers.
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.
Tell your doctor if you are pregnant or plan to become pregnant. Idacio can cross the placenta and may affect your baby's immune system. Talk to your doctor about vaccines for your baby if you took Idacio during pregnancy.
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How to Read This abatacept vs adalimumab Comparison
abatacept is classified in the T-Cell Co-Stimulation Modulator drug class, while adalimumab sits within the TNF-Alpha Inhibitor (Biologic) 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 98,951 submissions while adalimumab has 219,036. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known moderate interaction flagged in FDA labeling, attributed to both drugs lower your body's ability to fight germs. taking them together increases your risk of getting a very serious infection without helping your symptoms more.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for abatacept or adalimumab.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.