fam-trastuzumab deruxtecan

What is the most important information I should know about fam-trastuzumab deruxtecan?

Fam-trastuzumab deruxtecan can weaken (suppress) your immune system, and you may get an infection or bleed more easily. Tell your doctor if you have unusual bruising or bleeding, or signs of infection (fever, chills, weakness, cold or flu symptoms, frequent or recurring illness).

What is fam-trastuzumab deruxtecan?

Fam-trastuzumab deruxtecan is used in adults to treat HER2-positive breast cancer that has spread to other parts of the body (metastatic) or cannot be removed with surgery.

Fam-trastuzumab deruxtecan is also used in adults who have received an anti-HER2 breast cancer treatment before for metastatic diseases, or have breast cancer that has come back within 6 months of completing treatment for early stages breast cancer.

Fam-trastuzumab deruxtecan can also used in adults to treat a certain type of HER2-positive esophageal cancer.

Fam-trastuzumab deruxtecan is usually given after other cancer treatments did not work or have stopped working.

Fam-trastuzumab deruxtecan may also be used for purposes not listed in this medication guide.

What should I discuss with my healthcare provider before receiving fam-trastuzumab deruxtecan?

Tell your doctor if you have ever had:

• heart problems;
• breathing problems; or
• an infection.

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

• If you are a woman, do not use fam-trastuzumab deruxtecan if you are pregnant. Use effective birth control to prevent pregnancy while you are using this medicine and for at least 7 months after your last dose.
• If you are a man, use effective birth control if your sex partner is able to get pregnant. Keep using birth control for at least 4 months after your last dose.
• Tell your doctor right away if a pregnancy occurs while either the mother or the father is using fam-trastuzumab deruxtecan.

This medicine may affect fertility (ability to have children), in men.

How is fam-trastuzumab deruxtecan given?

Your doctor will perform blood tests to make sure you do not have conditions that would prevent you from safely using fam-trastuzumab deruxtecan.

Fam-trastuzumab deruxtecan is given as an infusion into a vein. A healthcare provider will give you this injection.

Fam-trastuzumab deruxtecan is usually given once every 3 weeks in a 21-day treatment cycle. Your doctor will determine how long to treat you with this medicine.

You may be given medication to prevent nausea or vomiting while you are receiving fam-trastuzumab deruxtecan.

You will need frequent medical tests.

What happens if I miss a dose?

What happens if I overdose?

Since this medicine is given by a healthcare professional in a medical setting, an overdose is unlikely to occur.

What should I avoid while receiving fam-trastuzumab deruxtecan?

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

What are the possible side effects of fam-trastuzumab deruxtecan?

• chest tightness, wheezing, cough, new or worsening shortness of breath;
• pounding heartbeats or fluttering in your chest;
• fever, tiredness, dizziness;
• swelling in your lower legs, sudden weight gain;
• a light-headed feeling, like you might pass out;
• low blood cell counts --fever, chills, mouth sores, skin sores, easy bruising, unusual bleeding, pale skin, cold hands and feet; or
• low potassium level --leg cramps, constipation, irregular heartbeats, fluttering in your chest, increased thirst or urination, numbness or tingling, muscle weakness or limp feeling.

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

Common side effects may include:

• nausea, vomiting, loss of appetite;
• diarrhea, constipation;
• cough;
• fever, feeling tired;
• low blood cell counts;
• low potassium;
• abnormal liver function tests; or
• hair loss.

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.

What other drugs will affect fam-trastuzumab deruxtecan?

Other drugs may affect fam-trastuzumab deruxtecan, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all your current medicines and any medicine you start or stop using.

Where can I get more information?

Your pharmacist can provide more information about fam-trastuzumab deruxtecan.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

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