What Are Biologics?

Understanding Biologic Drugs for Arthritis

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In the late 1990s, the first of several biologics went on the market to treat rheumatoid arthritis. The first was Enbrel (etanercept) -- but it did not take long for other biologics to be developed and marketed.

For more details on biologics, read this excerpt from UpToDate -- a trusted electronic reference used by many physicians and patients looking for in-depth and well-explained medical information.

Then read on so you will have a full understanding of biologics.

Biologics: Details from UpToDate

"Biologic response modifiers, also known as biologics, are medications that were designed to prevent or reduce the inflammation that damages joints. Biologics target molecules on cells of the immune system, joint, and the products that are secreted in the joint, all of which can cause inflammation and joint destruction. There are several types of biologics, each of which targets a specific type of molecule involved in this process (tumor necrosis factor, interleukin-1, and cell surface molecules on T and B lymphocytes)."

Biologics and Their Targets

Enbrel (etanercept), Remicade (infliximab), Humira (adalimumab), Simponi (golimumab), and Cimzia (certolizumab pegol) are biologics that target tumor necrosis factor (TNF). They are often referred to as TNF blockers.

Kineret (anakinra) inhibits interleukin-1.

It is generally regarded as a less effective biologic than TNF blockers.

Orencia (abatacept) interrupts the activation of T cells. Usually, Orencia is reserved for patients with moderate to severe rheumatoid arthritis who are unable to manage their disease with methotrexate and a TNF blocker.

Rituxan (rituximab) depletes B cells.

Again, this drug is typically reserved for patients who have an unsatisfactory result with methotrexate and a TNF blocker.

Who Should Be Treated With Biologics?

Patients who have had an unsatisfactory response to DMARDs (disease-modifying anti-rheumatic drugs), either alone or in combination with other arthritis medications, are usually good candidates for biologics.

Compared to DMARDs, biologics work more quickly. You should know whether you are responding within weeks of starting a biologic.

Who Should Not Be Treated With Biologics?

Unfortunately, there are patients who are not good candidates for treatment with biologics. There are certain conditions where the risks would most likely outweigh the benefits of treatment with biologics. For example, patients with a prior history of multiple sclerosis or lymphoma would not be good candidates. Patients with symptomatic congestive heart failure are also not good candidates. It's also too risky to use biologics if patients have severe or recurring infections.

Which of the Biologics Should You Use?

Your doctor will help you choose the best biologic for you. Cost is certainly a consideration. You and your doctor must determine if your health insurance will cover the drug you choose -- or how much your out-of-pocket expense will be. Be sure it is affordable for you.

Another consideration is convenience. How is the drug administered? Do you have to go to the doctor's office for treatment or would it be better for you to choose one of the biologics that is administered as a self-injection? How often is the drug administered -- once a week, twice a week, every two weeks, or monthly? What's your preference?

Is it important for you to choose a drug that has a good track record -- in other words, one of the older, rather than newer, biologics? These are all things to consider, because if you choose what suits you best, you will more likely remain compliant with treatment.

Want to learn more?

See UpToDate's topic Patient Information: Rheumatoid Arthritis Treatment for additional in-depth medical information on rheumatoid arthritis treatment.


Maini RN and Venables PJW. "Patient information: Rheumatoid arthritis treatment" UpToDate. Accessed October 31, 2009.

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