This medication can decrease your body's ability to fight an infection. This effect can lead to very serious (possibly fatal) infections (such as fungal infections, bacterial infections including tuberculosis). Tell your doctor your medical history, especially of past/recent/current infections. You should also tell your doctor if you have lived or traveled in areas where certain fungal infections (such as coccidioidomycosis, histoplasmosis) are common or if you have been near someone with tuberculosis. Areas where these types of fungal infections are commonly found include the Ohio and Mississippi River valleys and the southwestern United States. Tell your doctor right away if you develop signs of infection (see Side Effects section). Your doctor will test you for tuberculosis (TB) infection before and during treatment with this drug. If you are diagnosed with TB, your doctor will first prescribe treatment for this to prevent a serious TB infection while using adalimumab. Though it is very unlikely to happen, there is a risk (especially in children/teens/young adults) of developing cancer (such as lymphoma, skin cancer) due to this medication or due to your medical condition. Discuss the risks and benefits of treatment with your doctor. Tell your doctor right away if you develop symptoms such as a fever that doesn't go away, unusual lumps/growths, swollen glands, unexplained weight loss, or night sweats.

Redness, itching, pain, or swelling at the injection site may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you develop signs of infection while using this drug, such as: sore throat that doesn't go away, cough that doesn't go away, fever, chills, night sweats, trouble breathing, painful/frequent urination, unusual vaginal discharge, white patches in the mouth (oral thrush). Tell your doctor right away if you have any serious side effects, including: fast/irregular/pounding heartbeat, new or worsening symptoms of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/sudden weight gain), blood in the stools, mental/mood changes, severe headache, easy bruising/bleeding, leg pain/swelling, numbness or tingling of the arms/hands/legs/feet, unsteadiness, unexplained muscle weakness, difficulty with speaking/chewing/swallowing/facial movements, vision changes, joint pain, butterfly-shaped rash on the nose and cheeks. Adalimumab may rarely cause serious (possibly fatal) liver disease in people exposed to hepatitis B virus. Your doctor may order blood tests and watch for symptoms during treatment and for several months after your last treatment. Get medical help right away if you have any symptoms of liver damage, including: nausea/vomiting that doesn't stop, loss of appetite, stomach/abdominal pain, yellowing eyes/skin, dark urine. Get medical help right away if you have any very serious side effects, including: seizures, chest pain. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Some products that may interact with this drug include: other TNF blockers (such as etanercept, infliximab), other drugs that weaken the immune system (such as abatacept, anakinra).