Skip to Content
Meet others who have breast cancer. Get the free app.

Trastuzumab

Generic Name: trastuzumab (tras TOO zoo mab)
Brand Name: Herceptin

Medically reviewed by Drugs.com on Aug 28, 2018 – Written by Cerner Multum

What is trastuzumab?

See also: Kisqali

Trastuzumab is a cancer medicine that interferes with the growth and spread of cancer cells in the body.

Trastuzumab is used to treat certain types of breast cancer or stomach cancer, sometimes in combination with other cancer medicines.

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

Important Information

Do not use trastuzumab if you are pregnant. It could harm the unborn baby. Avoid becoming pregnant for at least 7 months after your last dose of trastuzumab.

Trastuzumab can cause heart failure, especially if you have heart disease or if you are also receiving certain other cancer medicines.

Some side effects may occur during the injection. Tell your caregivers if you feel dizzy, nauseated, light-headed, weak, short of breath, or if you have a headache, fever, or chills.

Before taking this medicine

You should not be treated with trastuzumab if you are allergic to it.

Tell your doctor if you have ever had:

Trastuzumab can cause heart failure, especially if you have heart disease or if you are also receiving certain other cancer medicines (such as daunorubicin, doxorubicin, epirubicin, or idarubicin)

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

Do not use trastuzumab if you are pregnant. trastuzumab can cause injury or death to the unborn baby. 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 become pregnant while using this medicine or within 7 months after you stop, your name may be listed on a pregnancy registry to track the effects of trastuzumab on the baby.

It may not be safe to breast-feed while using this medicine and for up to 7 months after your last dose. Ask your doctor about any risk.

How is trastuzumab given?

Your doctor will perform a medical test to make sure trastuzumab is the right medicine to treat your cancer.

Trastuzumab is given as an infusion into a vein. A healthcare provider will give you this injection.

Trastuzumab is usually given once every week or every 3 weeks. Follow your doctor's dosing instructions very carefully.

This medicine must be given slowly, and the infusion can take at least 90 minutes to complete.

You may need frequent medical tests to be sure this medicine is not causing harmful effects. Your cancer treatments may be delayed based on the results.

What happens if I miss a dose?

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

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while receiving trastuzumab?

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

Trastuzumab side effects

Some side effects may occur during the injection. Tell your caregiver right away if you feel dizzy, nauseated, light-headed, weak, short of breath, or if you have a headache, fever, or chills.

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:

  • new or worsening cough, fever, wheezing, or trouble breathing;

  • pounding heartbeats or fluttering in your chest;

  • chest pain spreading to your jaw;

  • swelling in your lower legs, rapid weight gain;

  • blisters or ulcers in your mouth, red or swollen gums, trouble swallowing;

  • increased blood pressure--severe headache, blurred vision, pounding in your neck or ears, anxiety, nosebleed; or

  • low blood cell counts--fever, chills, tiredness, skin sores, easy bruising, unusual bleeding, pale skin, cold hands and feet, feeling light-headed.

Common side effects may include:

  • diarrhea, weight loss;

  • headache;

  • trouble sleeping, feeling tired;

  • rash;

  • mouth sores;

  • fever, chills, cough, or other signs of infection;

  • altered sense of taste; or

  • cold symptoms such as stuffy nose, sinus pain, sore throat.

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 trastuzumab?

Other drugs may affect trastuzumab, 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.

Trastuzumab can have long lasting effects on your heart, especially if you receive other cancer medicines. For at least 7 months after your last dose of trastuzumab, tell any doctor who treats you that you have used trastuzumab.

Further information

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.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Hide