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Here is a passage from the IMAAVY PATIENT INFORMATION which may be helpful to address your question:

IMAAVY may cause serious side effects, including:

• infections. Infections are a common side effect of IMAAVY that can be serious. Receiving IMAAVY may increase your risk of infection. Tell your healthcare provider right away if you have any of the following symptoms of infection:¹ 
  • fever
  • chills
  • shivering
  • cough
  • sore throat
  • fever blisters
  • burning when you urinate
• allergic (hypersensitivity) reactions. Allergic reactions may happen during or up to a few weeks after your IMAAVY infusion. Get emergency medical help right away if you get any of these symptoms during or after your IMAAVY infusion, which may be part of a serious allergic reaction:¹ 
  • swelling of your face, lips, mouth, tongue, or throat
  • difficulty swallowing or breathing
  • itchy rash (hives)
  • chest pain or tightness
• infusion-related reactions. Tell your healthcare provider right away if you get any of the following symptoms during or a few days after your infusion of IMAAVY:¹ 
  • headache
  • rash
  • nausea
  • fatigue
  • dizziness
  • chills
  • flu-like symptoms
  • redness of skin

The most common side effects in people with generalized myasthenia gravis (gMG) treated with IMAAVY include: 

• infection in parts of your body that you use for breathing (respiratory tract infection)¹
• swelling in your hands, ankles, or feet (peripheral edema)¹
• muscle spasms¹

These are not all of the possible side effects of IMAAVY.¹ 

Call your doctor for medical advice about side effects. You may report side effects to Food and Drug Administration (FDA) at 1800FDA1088.¹ 

ADDITIONAL INFORMATION

This information is provided ONLY in response to your request and is not intended as medical advice, to promote the use of our product, or suggest using it in any manner other than as described in the PRESCRIBING INFORMATION. All decisions regarding your medical treatment should be made with your healthcare professional(s). Please contact your healthcare professional(s) to discuss the information in this response.

Please refer to the attached full PRESCRIBING INFORMATION and the PATIENT INFORMATION for IMAAVY.¹