Imfinzi (durvalumab) is a brand-name infusion prescribed for certain types of cancers, including certain lung cancers. As with other drugs, Imfinzi can cause side effects, such as fatigue, rash, cough, hair loss, and shortness of breath.

Imfinzi (durvalumab) is a brand-name prescription immunotherapy medication. It’s approved by the Food and Drug Administration (FDA) to treat certain types of lung cancer, as well as some other types of cancer.

Specifically, Imfinzi can be used in certain situations to treat:

Like other medications, Imfinzi can cause side effects. Read on to learn about potential common, mild, and serious side effects. For a general overview of Imfinzi, including details about its uses, see this article.

Imfinzi can cause certain side effects, some of which are more common than others. These side effects are usually temporary, lasting a few days or weeks. However, if the side effects last longer than that, bother you, or become severe, be sure to talk with your doctor or pharmacist.

The side effects can vary depending on the condition Imfinzi is being used to treat and whether Imfinzi is used alone or in combination with other drugs. Some of the more common side effects of the drug across all people treated with it include:

Mild side effects can occur with Imfinzi. This list doesn’t include all possible side effects of the drug. For more information, you can refer to Imfinzi’s prescribing information.

Mild side effects that people being treated with Imfinzi have reported include:

These side effects may be temporary, lasting a few days or weeks. However, if the side effects last longer than that, bother you, or become severe, be sure to talk with your doctor or pharmacist.

Note: After the Food and Drug Administration (FDA) approves a drug, it tracks the side effects the drug causes. If you develop a side effect during Imfinzi treatment and want to tell the FDA about it, visit MedWatch.

Imfinzi may cause serious side effects, but this isn’t common. The list below may not include all possible serious side effects of the drug. For more information, refer to Imfinzi’s prescribing information.

If you develop serious side effects as a result of your treatment with Imfinzi, call your doctor right away. If the side effects seem life threatening or you think you’re having a medical emergency, immediately call 911 or your local emergency number.

Serious side effects that have been reported can include:

For more information about each of these serious side effects, see “Side effect specifics” below.

Imfinzi may cause several side effects. Here are some frequently asked questions and answers about the drug’s side effects.

Is joint pain a side effect of Imfinzi?

Yes, joint pain was a common side effect in clinical trials of Imfinzi.

Imfinizi may also cause muscle pain, bone pain, or inflammation (damage and swelling) in your body, which can affect your joints and cause pain.

If you have joint pain during your treatment with Imfinzi, talk with your doctor. They may be able to recommend treatments to help you feel better. Or, they may suggest a different medication for your condition.

Will I need to be observed for side effects after Imfinzi infusions?

Imfinzi is given as an IV infusion by a healthcare professional, but you probably won’t need to stay for observation after receiving a dose.

Imfinzi may cause infusion reactions, such as dizziness or fainting, but these usually occur while you receive the drug. A healthcare professional will monitor you during the infusion to treat any reactions you develop.

Some drugs given by infusion can cause infusion-related reactions hours or even days after the infusion. However, this hasn’t been reported with Imfinzi.

If you have any concerns about infusion reactions from Imfinzi, talk with your doctor.

Does Imfinzi have long-term side effects?

Imfinzi may cause long-term side effects, such as immune systemic reactions, including inflammation and thyroid problems.

Most side effects go away after a few weeks of treatment or after stopping Imfinzi. However, some people may experience side effects after stopping treatment until the drug clears from the body. Some people may require, additional medication to treat the long-term side effects.

If you’re concerned about how long you may have certain side effects of Imfinzi, talk with your doctor.

Learn more about some of the side effects that Imfinzi may cause.

Hair loss

Hair loss may occur with Imfinzi treatment. This was one of the more common side effects reported in clinical trials of the drug.

Hair loss may also be a symptom of low levels of thyroid hormones, which is another potential side effect of Imfinzi.

In addition, hair loss is a common side effect of chemotherapy drugs. Imfinzi isn’t a type of chemotherapy, but it’s sometimes used with chemotherapy medications to treat cancer.

What you can do

Talk with your doctor if you’re concerned about or experiencing hair loss during treatment with Imfinzi. They can help determine the cause.

If your hair loss is related to hormone problems, your doctor may recommend medication to help regulate your hormone levels. Or, they may suggest that you try a different drug to treat your cancer.

Infusion reactions

Imfinzi is given as an IV infusion, which is an injection of medication into a vein over a period of time. In clinical trials of Imfinzi, there were reports of reactions that occurred during infusions. This included severe infusion reactions in rare cases.

Infusion reactions can also be life threatening. Symptoms of severe infusion reactions can include:

What you can do

If you experience an infusion reaction while receiving a dose of Imfinzi, your healthcare professional will typically slow down or stop the infusion. Depending on the severity of your reaction, they may give you medications or other treatments to ease the side effects.

Your doctor may also want you to receive your next infusion more slowly than the previous one. Giving the infusion over a longer period of time may lower your risk for having another infusion reaction.

If your infusion reaction is severe, your doctor may have you stop treatment with Imfinzi and try a different medication for your cancer.

Immune system reactions

Rarely, Imfinzi may cause serious allergic reactions that affect the immune system. Immune system reactions are when the immune system mistakenly attacks the body’s healthy cells. This can lead to inflammation (damage and swelling) in any part of the body. Sometimes, the immune system reactions can be severe or life threatening.

Symptoms can vary depending on which part of your body is affected. These reactions weren’t common in clinical trials.

The following are some serious immune system side effects that Imfinzi may cause:

  • Colitis (inflammation of the bowel). Symptoms can include:
    • diarrhea
    • severe abdominal pain
    • blood in your mucus or stool
  • Hepatitis (inflammation of the liver). Symptoms can include:
    • pain on the right side of your abdomen
    • jaundice (a yellowing of the whites of the eyes and the skin)
  • Hormone problems, including thyroid disorders. Symptoms can include:
    • weight gain or loss
    • feeling hot or cold
    • feeling unusually tired
  • Nephritis (inflammation of the kidneys). Symptoms can include:
  • Pneumonitis (inflammation of the lungs). Symptoms can include:
  • Type 1 diabetes. Symptoms can include:
    • weight loss
    • producing more urine than usual
    • feeling thirsty or hungry more than usual
    • blurry vision
    • tiredness or fatigue
  • Severe skin reactions. Symptoms can include:
    • itchiness
    • blisters
    • rash
    • swelling
  • Inflammation of the joints, muscles, and other organs, including the:
  • Hematologic reactions, including:

What you can do

During your Imfinzi treatment, your doctor will monitor you for inflammation or immune system reactions by ordering lab tests. These may include blood and urine tests.

If you have symptoms of an immune system reaction during your treatment with Imfinzi, talk with your doctor right away. Depending on which part of your body is affected, they may recommend treatment to help ease the inflammation. Your doctor may also decide to pause your Imfinzi treatment. Or, they may have you stop using Imfinzi and try a different treatment for your cancer.

Serious infections

Serious infections, such as pneumonia, may occur during Imfinzi treatment, but this isn’t common.

In clinical trials, people receiving Imfinzi were more likely to develop a serious infection, including pneumonia, than people receiving a placebo. (A placebo is a treatment without an active drug.)

Symptoms of pneumonia and other serious infections can include:

Symptoms of cystitis can include:

  • blood in the urine
  • pain in the pubic bone, lower back, or belly area
  • a burning feeling when urinating
  • urinating more often than usual

What you can do

While receiving Imfinzi treatment, talk with your doctor if you notice any symptoms of an infection. They can order tests to determine what type of infection you have. Your doctor can also recommend treatment to help ease your symptoms and clear up the infection.

In addition, you can take the following steps to help lower your risk for infection:

  • Wash your hands often using soap and warm water.
  • Avoid touching your face, especially your mouth, nose, and eyes.
  • Don’t share personal items, such as a toothbrush, washcloth, or cell phone.

Be sure to talk with your doctor about your health history before you start Imfinzi treatment. This drug may not be the right treatment for you if you have certain medical conditions or other factors that affect your health. The conditions and factors to consider include the following:

Allergic reaction. You should not receive Imfinzi if you’ve ever had an allergic reaction to it or any of its ingredients. Talk with your doctor about which other treatments are better choices for you.

Autoimmune disease. Imfinzi can cause your immune system to attack healthy cells, so the drug could worsen existing autoimmune diseases. (Lupus and Crohn’s disease are examples of autoimmune diseases.) Before you start Imfinzi treatment, tell your doctor about any autoimmune diseases you may have. They can determine whether Imfinzi is the best medication for your cancer.

Breathing problems. Receiving Imfinzi may cause damage to your lungs. If you have or have ever had any breathing problems, using this drug may worsen the condition. Before you start Imfinzi treatment, tell your doctor if you have a history of any breathing problems. They can determine whether Imfinzi or a different drug is the right option for you.

Previous radiation treatment. Non-small cell lung cancer is sometimes treated with radiation. Having radiation before receiving Imfinzi may increase your risk for serious inflammation of the lungs. If you’ve received radiation to the chest area, tell your doctor before you have Imfinzi treatment. They may want you to delay using the medication until the effects of the radiation have worn off.

Stem cell or organ transplant. Imfinzi can cause your immune system to attack healthy cells. This includes cells in organs such as your lungs, kidneys, liver, and heart. This could be especially dangerous if you’ve had a stem cell transplant or organ transplant. Before you start treatment with Imfinzi, be sure to tell your doctor if you’ve received a transplant.

Current infection. Some infections need time to clear up before it’s safe to start Imfinzi treatment. If you have a current infection and are receiving treatment for it, tell your doctor before you receive Imfinzi. They can advise you on when to start your treatment.

Alcohol consumption with Imfinzi

There are no known interactions between Imfinzi and alcohol. However, drinking alcohol could worsen certain side effects of Imfinzi, such as nausea or fatigue.

If you drink alcohol, be sure to talk with your doctor before using Imfinzi. They can determine how much is safe for you to consume during your treatment.

Pregnancy and breastfeeding while using Imfinzi

It is not safe to receive Imfinzi while pregnant. Studies of pregnant animals given Imfinzi found that the drug could cause pregnancy loss or stillborn offspring. Animal studies don’t always predict what will happen in people. However, it’s recommended that Imfinzi is not used during pregnancy.

If you’re pregnant or planning to become pregnant, talk with your doctor. They can recommend a treatment other than Imfinzi.

Keep in mind that if you’re receiving Imfinzi and are able to become pregnant, you should use birth control during treatment. You should keep using it for 3 months or more after your last dose of the medication.

Also, there’s no information on the safety of Imfinzi treatment while breastfeeding. It’s recommended that you do not breastfeed during Imfinzi treatment and for at least 3 months after your final dose of the drug. You should talk with your doctor if you’re thinking about breastfeeding. They can advise you on whether Imfinzi is right for you.

Side effects can occur while you’re receiving Imfinzi treatment, but they’re usually mild. Most mild side effects of the drug go away with time and don’t require medical attention.

It’s important to note that Imfinzi may be used with chemotherapy or biologics. Some side effects of chemotherapy or biologic drugs and Imfinzi overlap, but the medications can also cause different side effects. Your doctor or pharmacist can help explain similarities and differences in side effects you may expect from each drug.

You should call your doctor if you have any symptoms of an infusion reaction, immune system reaction, infection, or allergic reaction. These side effects could be serious and require medical attention.

If you’d like to learn more about Imfinzi, talk with your doctor or pharmacist. They can help answer any questions you have about the side effects of the drug.

Disclaimer: Medical News Today has made every effort to make certain that all information is factually correct, comprehensive, and up to date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or another healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.