URL of this page: https://medlineplus.gov/druginfo/meds/a620063.html

Casirivimab and Imdevimab Injection

pronounced as (kas ir' iv i mab)(im dev' i mab)


The combination of casirivimab and imdevimab is currently being studied for the treatment of coronavirus disease 2019 (COVID-19) caused by the SARS-CoV-2 virus.

Only limited clinical trial information is available at this time to support the use of casirivimab and imdevimab for the treatment of COVID-19. More information is needed to know how well casirivimab and imdevimab works for the treatment of COVID-19 and the possible adverse events from it.

The combination of casirivimab and imdevimab has not undergone the standard review to be approved by the FDA for use. However, the FDA has approved an Emergency Use Authorization (EUA) to allow certain non-hospitalized adults and children 12 years of age and older who have mild to moderate COVID-19 symptoms to receive casirivimab and imdevimab injection.

Talk to your doctor about the risks and benefits of receiving this medication.

Why is this medication prescribed?

The combination of casirivimab and imdevimab is used to treat COVID-19 infection in certain non-hospitalized adults and children 12 years of age and older who weigh at least 88 pounds (40 kg) and who have mild to moderate COVID-19 symptoms. The combination is used in people who have certain medical conditions that make them at higher risk for developing severe COVID-19 symptoms or the need to be hospitalized from COVID-19 infection. Casirivimab and imdevimab are in a class of medications called monoclonal antibodies. They work by blocking the action of a certain natural substance in the body to stop the spread of the virus.

How should this medicine be used?

The combination of casirivimab and imdevimab comes as a solution (liquid) to be mixed with liquid and injected slowly into a vein over 60 minutes by a doctor or nurse. It is given as a one-time dose as soon as possible after a positive test for COVID-19 and within 10 days after the start of COVID-19 infection symptoms such as a fever, cough, or shortness of breath.

The combination of casirivimab and imdevimab may cause serious reactions during and after the infusion of the medication. A doctor or nurse will monitor you carefully while you are receiving the medication and for 1 hour after you receive it. Tell your doctor or nurse immediately if you experience any of the following symptoms during or after the infusion: fever, chills, nausea, headache, changes in your heartbeat, chest pain, weakness or tiredness, confusion, trouble breathing or shortness of breath, wheezing, throat irritation, rash, hives, itching, muscle pain or aches, sweating, dizziness especially when standing up, or swelling of the face, throat, tongue, lips, or eyes. Your doctor may need to slow down your infusion or stop your treatment if you experience these side effects.

Ask your pharmacist or doctor for a copy of the manufacturer's information for the patient.

Other uses for this medicine

This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.

What special precautions should I follow?

Before receiving casirivimab and imdevimab,

  • tell your doctor and pharmacist if you are allergic to casirivimab, imdevimab, any other medications, or any of the ingredients in casirivimab and imdevimab injection. Ask your pharmacist for a list of the ingredients.
  • tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: immunosuppressive medications such as cyclosporine (Gengraf, Neoral, Sandimmune), prednisone, and tacrolimus (Astagraf, Envarsus, Prograf). Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
  • tell your doctor if you have or have ever had any medical conditions.
  • tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while receiving casirivimab and imdevimab, call your doctor.

What special dietary instructions should I follow?

Unless your doctor tells you otherwise, continue your normal diet.

What side effects can this medication cause?

Casirivimab and imdevimab may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • pain, bleeding, bruising of the skin, soreness, swelling, or infection at injection site

Some side effects can be serious. If you experience any of these symptoms or those in the HOW section, call your doctor immediately or get emergency medical treatment.

  • fever
  • difficulty breathing
  • changes in heart rate
  • tiredness or weakness
  • confusion

Casirivimab and imdevimab may cause other side effects. Call your doctor if you have any unusual problems while receiving this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online (http://www.fda.gov/Safety/MedWatch) or by phone (1-800-332-1088).

What other information should I know?

Keep all appointments with your doctor.

Ask your pharmacist any questions you have about casirivimab and imdevimab injection.

You should continue to isolate as directed by your doctor and follow public health practices such as wearing a mask, social distancing, and frequent hand washing.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.

The American Society of Health-System Pharmacists, Inc. represents that this information about casirivimab and imdevimab was formulated with a reasonable standard of care, and in conformity with professional standards in the field. Readers are cautioned that the combination casirivimab and imdevimab is not an approved treatment for coronavirus disease 2019 (COVID-19) caused by SARS-CoV-2, but rather, is being investigated for and is currently available under, an FDA emergency use authorization (EUA) for the treatment of mild to moderate COVID-19 in certain outpatients. The American Society of Health-System Pharmacists, Inc. makes no representations or warranties, express or implied, including, but not limited to, any implied warranty of merchantability and/or fitness for a particular purpose, with respect to the information, and specifically disclaims all such warranties. Readers of the information about casirivimab and imdevimab are advised that ASHP is not responsible for the continued currency of the information, for any errors or omissions, and/or for any consequences arising from the use of this information. Readers are advised that decisions regarding drug therapy are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and the information contained in this information is provided for informational purposes only. The American Society of Health-System Pharmacists, Inc. does not endorse or recommend the use of any drug. This information about casirivimab and imdevimab is not to be considered individual patient advice. Because of the changing nature of drug information, you are advised to consult with your physician or pharmacist about specific clinical use of any and all medications.

Brand names

Last Revised - 03/15/2021