Ofatumumab

Other Names: Arzerra®

About This Drug

Ofatumumab is used to treat cancer. It is given through the vein.

Possible Side Effects (More Common)

  • Bone marrow depression. This is a decrease in the number of white blood cells, red blood cells, and platelets. This may raise your risk of infection, make you tired and weak (fatigue), and raise your risk of bleeding.

Possible Side Effects (Less Common)

  • Headache
  • Generalized weakness and discomfort (aches or pains)
  • Weakness that interferes with your daily activities

Infusion Reactions

  • Less serious reactions to this drug may happen. You will be given medicines to help stop or lessen these symptoms. Your vital signs will be checked during the infusion. Tell your doctor or nurse right away if you have any of these symptoms any time during the infusion and/or for the first 24 hours after getting this drug.
    • fever, chills, or shaking chills
    • feeling dizzy or lightheaded
    • headache
    • nausea or throwing up

Food and Drug Interactions

There are no known interactions of ofatumumab with food. This drug may interact with other medications. Tell your doctor and pharmacist about all the medication and dietary supplements (vitamins, minerals, herbs, and others) that you are currently taking. The safety and effectiveness of dietary supplements and alternative diets are often unknown. Using these might unexpectedly affect your cancer or interfere with your treatment. Until more is known, you should not use dietary supplements or alternative diets without your cancer doctor's advice.

When to Call the Doctor

Call your doctor or nurse immediately if you have any of the following symptoms:

  • Fever of 100.5 F (38 C) or higher
  • Chills
  • Seizures
  • Easy bleeding or bruising
  • Wheezing or trouble breathing
  • Rash or itching
  • Feeling dizzy or lightheaded
  • Feeling that your heart is beating in a fast or not normal way (palpitations)
  • Loose bowel movements (diarrhea) more than 4 times a day or diarrhea with weakness or lightheadedness
  • Blurred vision or other changes in eyesight
  • Pain when passing urine; blood in urine
  • Pain in your lower back or side
  • Confusion or agitation
  • Nausea that stops you from eating or drinking
  • Throwing up more than 3 times a day

Call your doctor or nurse as soon as possible if any of the following symptoms occur:

  • Pain in your mouth or throat that makes it hard to eat or drink
  • Nausea that is not relieved by prescribed medicines
  • Rash that is not relieved by prescribed medicines
  • Heavy menstrual period that lasts longer than normal
  • Lasting loss of appetite or rapid weight loss of five pounds in a week
  • Fatigue that interferes with your daily activities
  • Headache that does not go away
  • No bowel movement for 3 days or you feel uncomfortable
  • Extreme weakness that interferes with normal activities

Reproduction Concerns

  • Pregnancy warning: It is not known if this drug may harm an unborn child. For this reason, be sure to talk with your doctor if you are pregnant or planning to become pregnant while getting this drug.
  • Breast feeding warning: It is not known if this drug passes into breast milk. For this reason, women should talk to their doctor about the risks and benefits of breast feeding during treatment with this drug because this drug may enter the breast milk and badly harm a breast feeding baby.

Last Updated: March 2016