fam-trastuzumab deruxtecan (Enhertu)

Brand Names: Enhertu

Generic Name: fam-trastuzumab deruxtecan

What is fam-trastuzumab deruxtecan (Enhertu)?

Fam-trastuzumab deruxtecan is used 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 usually given after 2 or more other treatments have failed.

Fam-trastuzumab deruxtecan was approved by the US Food and Drug Administration (FDA) on an "accelerated" basis. In clinical studies, some people responded to this medicine, but further studies are needed.

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

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

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

Call your doctor at once if you have:

  • chest tightness, wheezing, cough, new or worsening shortness of breath;
  • fever, tiredness, dizziness;
  • pounding heartbeats or fluttering in your chest;
  • swelling in your lower legs, sudden weight gain;
  • a light-headed feeling, like you might pass out; or
  • low blood cell counts--fever, chills, tiredness, mouth sores, skin sores, easy bruising, unusual bleeding, pale skin, cold hands and feet, feeling light-headed or short of breath.

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

Common side effects may include:

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 is the most important information I should know about fam-trastuzumab deruxtecan (Enhertu)?

Fam-trastuzumab deruxtecan can cause serious or life-threatening side effects on your heart or lungs. Call your doctor right away if you have a cough, tiredness, dizziness, chest tightness, wheezing, irregular heartbeats, new or worsening shortness of breath.

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 should I discuss with my healthcare provider before receiving fam-trastuzumab deruxtecan (Enhertu)?

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.

Fam-trastuzumab deruxtecan can harm an unborn baby or cause birth defects if the mother or the father is using this medicine.

  • 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.

Do not breastfeed while using this medicine, and for at least 7 months after your last dose.

How is fam-trastuzumab deruxtecan given (Enhertu)?

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 other medications to treat serious side effects. Keep using these medicines for as long as your doctor has prescribed.

You will need frequent medical tests.


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What happens if I miss a dose (Enhertu)?

Call your doctor for instructions if you miss an appointment for your fam-trastuzumab deruxtecan injection.

What happens if I overdose (Enhertu)?

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 (Enhertu)?

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

What other drugs will affect fam-trastuzumab deruxtecan (Enhertu)?

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 (Enhertu)?

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.

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Reviewed on 11/15/2021

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