Moxetumomab pasudotox is used to treat adults with hairy cell leukemia.

Moxetumomab pasudotox is given after at least two other cancer treatments did not work or have stopped working.

Moxetumomab pasudotox may also be used for purposes not listed in this medication guide.

Tell your doctor if you have ever had:

• kidney disease; or
• a condition that affects your blood and blood vessels (such as hemolytic uremic syndrome or severe thrombotic microangiopathy).

You may need to have a negative pregnancy test before starting this treatment.

Do not use moxetumomab pasudotox if you are pregnant. It could harm the unborn baby. Use effective birth control to prevent pregnancy while you are using this medicine and for at least 30 days after your last dose. Tell your doctor right away if you become pregnant.

You should not breastfeed while using moxetumomab pasudotox.

Use Moxetumomab Pasudotox (Intravenous) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Some side effects may occur during the injection. Tell your caregiver if you feel dizzy, nauseated, hot or cold, light-headed, or have a headache, muscle pain, cough, trouble breathing, or fast heartbeats.

Moxetumomab pasudotox can damage red blood cells, which may cause irreversible kidney failure. Get emergency medical help if you have: unusual bruising or bleeding, fever, confusion, tiredness or irritability, stomach pain, vomiting, dark urine, fast heartbeats, and little or no urination.

Call your doctor at once if you have:

• low red blood cells (anemia)--pale skin, unusual tiredness, feeling light-headed or short of breath, cold hands and feet;
• signs of an electrolyte imbalance--muscle spasms or contractions, numbness or tingly feeling, nausea, fast or irregular heartbeats, seizure; or
• capillary leak syndrome--dizziness, weakness, cough, trouble breathing, and sudden swelling or weight gain.

Serious side effects may be more likely in older adults.

Your cancer treatments may be delayed or permanently discontinued if you have certain side effects.

Common side effects may include:

• swelling in your arms, legs, or face;
• nausea, diarrhea, constipation;
• headache, tiredness;
• fever; or
• anemia.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Follow your doctor's instructions about any restrictions on food, beverages, or activity.