Avelumab

Avelumab is used to treat certain types of cancer. Learn how to use the medication, its common side effects, special precautions to watch out for, and more.

What is this medication for?

Avelumab is used to treat:

  • Merkel cell carcinoma (a type of skin cancer) which has spread to other parts of the body
  • Advanced bladder cancer after the disease has been controlled with chemotherapy
  • Advanced renal cell carcinoma (kidney cancer), in combination with an oral medication called axitinib

It belongs to a class of medications called immunotherapy, which makes your body’s immune cells more active to attack cancer cells. 

How should I take or use this medication?

Avelumab is injected into the vein as an infusion which lasts for 60 minutes, once every 2 weeks.

Your doctor will decide how many cycles of treatment is required.

What precautions should I take when taking or using this medication?

  • Inform your healthcare professional if: 
    • You are allergic to this medication or any of the other ingredients of this medication.
    • You are taking any other medications, including supplements, traditional medications and herbal remedies.
    • You have any other medical conditions.
    • You are going to receive any vaccination or undergo surgery, including dental surgery.
    • You have any plans to start a family in the future. Avelumab may have an anti-fertility effect, which could be irreversible. You should discuss fertility preserving options with your doctor before starting treatment.
  • You should not breastfeed during treatment and for at least 1 month after stopping Avelumab.
  • You should not become pregnant during treatment. You should use an effective birth control method during treatment and for at least 1 month after stopping Avelumab. 
  • If you have a partner who could become pregnant, you should use an effective birth control method during treatment and for at least 1 month after stopping Avelumab.

What are some common side effects of this medication?

It is normal to experience some side effects from Avelumab, which are usually mild. 

Rarely, Avelumab may cause serious side effects when it causes the body’s immune system to become too active, which then starts to attack healthy parts of the body. This causes inflammation. These immune-related side effects may occur weeks to months after treatment.

The table below will list some of the common side effects as well as the rare but serious side effects.

Side Effect

Management

Infusion-related reaction

This sometimes occurs during the first few doses.

This is usually mild or moderate, but rarely can be more severe. 

  • For the first 4 infusions, you will be given an anti-allergy medication and Paracetamol to prevent infusion reactions. These medications may not be required from the 5th infusion onwards if you do not have an infusion reaction.
  • Inform the nurse immediately if you experience any of the following during the infusion:
    • Flu-like symptoms such as fever, chills or dizziness, headache, feeling warm or flushed
    • Red, warm, and itchy bumps on the skin
    • Swelling of the lips, tongue, or throat
    • Breathlessness, wheezing, cough or sudden difficulty breathing
    • Back pain or chest pain
  • If you do have a reaction, this is usually treated by slowing or stopping the drip until the reaction is over. Future infusions may also be given at a slower rate.

Skin rash

 

  • You may experience mild skin rashes that may be itchy.
  • Avoid hot showers. Use cool or lukewarm water to bathe.
  • Apply a moisturizer to areas with dry skin.
  • There are rare cases where the skin rash is severe. Proceed to the A&E Department immediately if the rash is painful, blistering, or if it affects a large area of the body.

Muscle-aches and/or joint pain

Feeling tired

 

  • It is normal to feel tired after treatment.
  • Mild pain can be relieved by taking Paracetamol.
  • Inform your doctor if you have any severe pain in the muscles or joints that affect walking or sleeping.

Diarrhoea (loose stools)

It is common to have mild diarrhoea after treatment.

  • Drink more water to prevent dehydration.
  • Rarely, colitis (inflammation of the bowels) may occur and cause severe diarrhea. Proceed to the A&E department if you experience abdominal pain, loose stools more than 4 times a day, mucus or blood in stools, or if your stools appear black and sticky.

Hormonal abnormalities 

Inflammation of various hormone glands (such as the pituitary, thyroid, pancreas and adrenal glands) may occur 

This may affect the production of certain hormones in your body

  • Some hormone levels can be monitored with regular blood tests.
  • Some of the signs and symptoms include the following:
    • Headaches that do not go away
    • Vision problems
    • Unusually fast heartbeat
    • Increased sweating
    • Extreme tiredness
    • Unusual weight gain or weight loss
    • Feeling cold all the time
    • Increased hunger or thirst
    • Increased urination
    • Dizziness or fainting
    • Changes in mood or behaviour
  • Inform your doctor if any of these occurs. 
  • You may be given medication to treat your condition. 

Pneumonitis (inflammation of the lungs)

  • Please see a doctor if you experience shortness of breath or a dry cough that does not go away.

Liver problems 

  • Proceed to the A&E department immediately if you experience any:
    • Dark or tea-coloured urine
    • Pale or light-coloured stools
    • Yellowing of skin or eyes
    • Nausea, vomiting with loss of appetite
    • Severe stomach pain
  • Keep your doctor informed about any supplements or over-the-counter medications that you take.

Kidney problems 

  • Proceed to the A&E department immediately if you are unable to pass urine or have an abnormal leg swelling. 

Heart problems

  • Proceed to the A&E department immediately if you experience signs of heart problems such as shortness of breath, difficulty breathing, chest pain, a fast heartbeat, or sudden swelling of legs.

Eye problems

  • Inform your doctor if you experience any blurred vision, double vision, eye pain or redness, or any other problems with vision.

 

What food or medication should I avoid when I take or use this medication?

Inform your healthcare professional if you are taking or intend to take any other medications, supplements, traditional medications, or herbal remedies, including those that are over-the-counter.   

What else should I know about this medication?

Tips to help manage your condition while you are on Avelumab

Exercise

Light exercise is recommended as it helps to improve mobility, balance, and even emotional well-being. Avoid strenuous exercise, and rest when you are feeling tired.

Medical and dental treatment

If you need to go to the  hospital for any reason other than cancer, always inform the doctors and nurses that you are receiving anti-cancer treatment.

Talk to your cancer doctor if you think you need dental treatment. Always inform your dentist that you are receiving anti-cancer treatment.

Seek support if you feel overwhelmed

It is normal to feel fearful or worried about your condition.

Do not be afraid to talk about your concerns with your healthcare team or loved ones.

There may be resources and support available to help you.

Disclaimer

Please take note that the above is not a complete list of all possible side effects. If you have any concerns about your medication or if you have other side effects that you think are caused by this medication, please consult your doctor or pharmacist.

If you take more than the recommended dose, please seek medical advice immediately. The information provided on this page does not replace information from your healthcare professional. Please consult your healthcare professional for more information.

This article is jointly developed by members of the National Medication Information workgroup. The workgroup consists of cluster partners (National Healthcare Group, National University Health System and SingHealth), community pharmacies (Guardian, Unity and Watsons) and Pharmaceutical Society of Singapore. The content does not reflect drug availability and supply information in pharmacies and healthcare institutions. You are advised to check with the respective institutions for such information.

Last updated on Apr 2025 

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