Opdualag® (nivolumab and relatlimab-rmbw)

Author: Marisa Healy, BSN, RN
Content Contributor: Christina Bach, MBE, LCSW, and Christopher Tweed, PharmD, BCOP
Last Reviewed: May 26, 2026

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Pronounce: Nye-vol'-ue-mab and Rel-at-li-mab

Classification: Programmed death receptor-1 (PD-1) blocking antibody (nivolumab) and a lymphocyte activation gene-3 (LAG-3) blocking antibody (relatlimab).

About Opdualag® (nivolumab and relatlimab-rmbw)

This medication is a combination of the programmed death receptor-1 (PD-1) blocking antibody nivolumab and the LAG-3-blocking antibody relatlimab. 

The immune system works by creating antibodies, which are proteins that attach to the surface of a cell. The antibody “calls” the immune system to attack the cell it is attached to, causing the immune system to kill the cell. Monoclonal antibodies are made in a lab to attach to certain types of cancer cells. These antibodies can work in different ways, including stimulating (revving up) the immune system to kill the cell, blocking cell growth, or other things needed for cell growth. Nivolumab and relatlimab are both monoclonal antibodies.

  • Nivolumab is a type of monoclonal antibody therapy, which works by binding to the "programmed death receptor" (PD1) found on T-cells to stimulate the immune system to find and kill cancer cells.
  • Relatlimab targets lymphocyte-activation gene 3 (LAG-3), a cell-surface receptor found on some T cells.

Targeting LAG3 along with PD1 may help restore T-cells and can help with an anti-tumor immune response.

How to Take the Medication

This medication is given by a single intravenous (IV, into a vein) infusion (both medications are mixed and given at the same time). Your provider will decide your dose and how often you receive the medication.

Make sure your provider is aware of all medications (including prescription and over-the-counter), supplements, and vitamins you are taking. Steroids should be avoided while on immunotherapy unless directed by your care team.

Tell your provider about all your medical conditions, including autoimmune disorders (Crohn’s disease, lupus, rheumatoid arthritis, etc.), as these can get worse with immunotherapy. Tell your provider if you have had or plan on having an allogeneic stem cell transplant. This medication can make graft-versus-host disease worse.

Immune Reactions

The medication helps your body's immune system attack cancer cells. However, as your immune system attacks cancer cells, it can also affect normal organs and tissues. This can cause serious or life-threatening problems.  Tell your provider right away if you have any of the following symptoms:

  • Autoimmune Complications: Tell your provider about all of your health conditions. They need to know if you have an autoimmune condition like Crohn’s disease, lupus, or rheumatoid arthritis. These conditions can get worse with immunotherapy.
  • Gastrointestinal Problems: Gastrointestinal (GI) problems can include colitis (inflammation of the bowel) and diarrhea. Symptoms are abdominal (belly) pain, cramping, mucus or blood in the stool, dark or tar-like stools, and fever.  Diarrhea can be stools that are looser or more frequent than what you are used to.
  • Bowel Obstruction or Perforation: Bowel obstruction is a blockage in your intestines. A perforation is a tear in your intestines. Symptoms of an obstruction or a tear are abdominal (belly) pain, fever, constipation, bloating, and cramping. Call your provider if you are not moving your bowels as often as you normally do.
  • Skin Reactions: Skin reactions can include rash, with or without itching (pruritis), sores in your mouth, and blistering or peeling skin. Your provider will suggest ways to manage these issues.  
  • Hormone Changes: Your pituitary, thyroid, pancreas, and adrenal glands can be affected by this medication. When these glands are inflamed or irritated, they can make too much or too little of a certain hormone. Some hormone levels can be monitored with blood work. Symptoms of hormonal changes may be: headaches, nausea, vomiting, constipation, rapid heart rate, increased sweating, extreme fatigue, weakness, changes in your voice, changes in memory and concentration, increased hunger or thirst, increased urination, weight gain, hair loss, dizziness, feeling cold all the time, and changes in mood or behavior (including irritability, forgetfulness and decreased sex drive).
  • Brain and/or Nerve Problems: Symptoms include headaches, drooping of eyelids, double vision, trouble swallowing, weakness in the arms, legs, or face, or numbness or tingling in the hands or feet.
  • Eye Problems: Changes in vision (eyesight), blurry or double vision, and eye pain or redness are symptoms of eye problems. 
  • Kidney Problems: Kidney problems, like inflammation or not working as well as they should, can cause decreased urine output, blood in the urine, swelling in the ankles, or loss of appetite (not feeling as hungry). 
  • Liver Problems: Hepatitis, or inflammation of the liver, can cause yellowing of the skin or eyes,  dark or brown urine, pain in your abdomen (belly), bleeding or bruising more easily than normal, or severe nausea and vomiting.
  • Lung Problems: This medication can cause pneumonitis, which is inflammation of the lungs. Symptoms are a new or worsening cough, shortness of breath, trouble breathing, or chest pain.
  • Pancreas Problems: Signs can be bloating, indigestion, fatty stools, loss of appetite, sweating, abdominal (belly) pain, and weight loss.

Joint or Muscle Pain

You may have joint or muscle pain:

  • Arthralgia pain is like arthritis pain. It can cause morning stiffness, and you may feel it in your joints at different times during the day. It can also cause pain in your elbows, shoulders, wrists, knees, feet, pelvic and hip bones, or back.
  • Myalgia is pain or aching in your muscles. 

Your providers can recommend medication and other ways to relieve pain.

Fatigue

Fatigue can cause exhaustion, feeling worn out and that your body is "heavy" and hard to move, or being unable to focus. It is common when you have cancer, and it is not the same as feeling tired. You may need to adjust your schedule to manage fatigue. Plan times to rest during the day and save your energy for more important activities. Exercise can help lessen fatigue. Talk to your providers about ways to deal with this side effect.

Low Red Blood Cell Count (Anemia)

Anemia is when your red blood cell count is lower than normal. Red blood cells carry oxygen to the tissues in your body. When your red cell count is low, you may feel tired or weak. Tell your providers if you have shortness of breath, trouble breathing, or pain in your chest. If your count gets too low, you may receive a blood transfusion.

Low White Blood Cell Count (Leukopenia or Neutropenia)

White blood cells (WBC) help your body fight infection. While you are having treatment for cancer, your WBC count can drop, putting you at a higher risk of an infection. Tell your provider right away if you have a fever (temperature greater than 100.4°F or 38°C), sore throat or cold, shortness of breath, cough, burning with urination, or a sore that doesn't heal.

Tips for preventing infection:

  • Hand washing: both yours and your visitors is the best way to prevent the spread of infection.
  • Avoid large crowds and people who are sick (those who have a cold, fever, or cough, or live with someone with these symptoms).
  • When working outside, wear clothes that protect you, like long pants and gloves.
  • Do not handle pet waste.
  • Keep all cuts and scratches clean.
  • Shower or bathe daily. 
  • Brush your teeth at least twice a day.
  • Do not cut cuticles or ingrown nails. You may wear nail polish, but not fake nails.
  • Ask your providers before scheduling dental appointments or procedures.
  • Ask your providers before you or someone you live with has any vaccines

Rash

Some people may get a rash, scaly skin, or red, itchy bumps from this medication. Tell your provider if you notice any of these changes in your skin, since it could be a reaction. Your provider may suggest:

  • Using an alcohol-free moisturizer on your skin and lips, and do not use moisturizers with perfumes or scents. 
  • Keep the area clean to avoid infection, especially if it cracks or bleeds.
  • Using a topical medication (applied to the skin) if the itching bothers you.

Be sure to talk with your provider about how to care for your skin.

Electrolyte Changes

This medication can affect the level of sodium (and possibly other electrolytes) in your body. Your levels will be monitored using blood tests. If your levels become too low, your provider may prescribe specific electrolytes to be given by IV or taken by mouth. Do not take any supplements without first consulting with your provider.

Reproductive Concerns

There is a higher risk of health problems for your baby if you are pregnant, become pregnant, or get someone pregnant while on this medication. To lower the risk of birth defects, you should use birth control (contraception) to avoid pregnancy. Talk with your provider about what kind of birth control is safest for you and your partner.

If you can become pregnant, you will need to use effective birth control during treatment and for 5 months after the last dose of this medication, even if your menstrual cycle has stopped or changed. You should not breastfeed during treatment and for 5 months after the last dose of this medication.

Important but Less Common Side Effects

Infusion-Related Side Effects

Some people may have a reaction during infusion of this medication. These can be:

  • Chills.
  • Fever.
  • Low blood pressure.
  • Nausea.
  • Vomiting.

Your provider will monitor you for symptoms of infusion-related reactions. 

Allogeneic Stem Cell Transplant Reactions

Patients who receive this medication before or after having an allogeneic stem cell transplant can be at an increased risk of graft vs. host disease, veno-occlusive disease, and fever syndrome. Your providers will monitor you closely for these side effects.