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For treating non-Hodgkin's lymphoma with Bexxar, the dosage will depend on your platelet count and the levels of the drug in your bloodstream after the first two doses. This medicine comes as an injection that is administered slowly into a vein through an intravenous infusion. You will receive two infusions one day, followed by two more infusions one to two weeks later.

An Introduction to Dosing With Bexxar

The dosage of Bexxar® (tositumomab) your healthcare provider recommends will vary, based on the following factors:
  • Your platelet count (as measured by a simple blood test)
  • How much Bexxar is absorbed in your bloodstream after your first two doses.
As is always the case, do not adjust your dosage unless your healthcare provider specifically tells you to do so.

Bexxar Dosage for Non-Hodgkin's Lymphoma

The usual Bexxar dosing regimen for the treatment of non-Hodgkin's lymphoma consists of four appointments with your healthcare provider, over one to two weeks. You will only receive your Bexxar doses at two of these four appointments. During three of the appointments, you will receive a body scan that shows your healthcare provider how much and where Bexxar is in your body.
The following steps will happen during your four appointments:
  • At the first appointment, you will receive:
    • Bexxar 450 mg, given as an intravenous (IV) infusion (a slow drip into a vein) over at least 60 minutes.
    • Bexxar and Iodine I-131 given as an IV infusion over at least 20 minutes.
    • A body scan.
  • At your second and third appointments, you will receive a body scan only. You will not be given Bexxar at these appointments.
  • At your fourth appointment, you will receive:
    • Bexxar 450 mg, given as an IV infusion over at least 60 minutes.
    • Bexxar and Iodine I-131 given as an IV infusion over at least 20 minutes. Your healthcare provider will calculate this dosage based on your platelet count and the results of your body scans.
You will be given other medications by mouth (known as premedication) 30 minutes before receiving Bexxar, to help reduce the likelihood of infusion reactions (potentially serious reactions that may occur from the intravenous infusion). Premedication usually consists of acetaminophen (Tylenol®) 650 mg and diphenhydramine (Benadryl® and others) 50 mg, or other similar medications. If you experience infusion reactions, your healthcare provider may temporarily stop your infusion, or administer it more slowly.
Because Bexxar can damage the thyroid gland, you will be given other medicine to protect your thyroid starting at least 24 hours before your first dosage of Bexxar and continuing for at least two weeks after your last dosage of Bexxar. It is important to take this thyroid medicine as directed by your healthcare provider.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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