Fam-trastuzumab Deruxtecan-nxki Injection 100 mg (TRASTUZUMAB DERUXTECAN - INJECTION)

Instructions

This medicine is given as an IV injection into a vein.

This medicine should be given over 90 minutes.

This medicine should be given by a trained health care provider.

It is important that you keep taking each dose of this medicine on time even if you are feeling well.

If you miss a dose, contact your doctor for instructions.

Drug interactions can change how medicines work or increase risk for side effects. Tell your health care providers about all medicines taken. Include prescription and over-the-counter medicines, vitamins, and herbal medicines. Speak with your doctor or pharmacist before starting or stopping any medicine.

Your doctor may prescribe other medications to reduce side effects. Follow instructions carefully.

Keep all appointments for medical exams and tests while on this medicine.

Cautions

Tell your doctor and pharmacist if you ever had an allergic reaction to a medicine.

Some patients with weak hearts may have worsening of symptoms. If you notice difficulty breathing, weight gain, or swelling of your legs or ankles, let your doctor know right away.

This medicine may cause dizziness or fainting. Do not stand or sit up quickly.

Your ability to stay alert or to react quickly may be impaired by this medicine. Do not drive or operate machinery until you know how this medicine will affect you.

If possible, avoid using with alcohol, marijuana, or other medicines that can cause dizziness or drowsiness. These include allergy/cold products, muscle relaxers, sleep aids, and pain relievers.

This medicine may reduce your body's ability to fight infections. Avoid contact with people with colds, flu or other infections. Contact your doctor if you develop fever, cough, sore throat, or chills.

Speak with your health care provider before receiving any vaccinations.

Do not breastfeed while on this medicine. You may safely start breastfeeding 7 months after stopping treatment.

This medicine can hurt a new baby in the womb. If you become pregnant while on this medicine, tell your doctor immediately. Your doctor may switch you to a different medicine.

Women of childbearing age should have a negative pregnancy test before starting this medicine.

Women must use reliable forms of birth control while taking this medicine and for 7 months after stopping to prevent pregnancy.

Men with a female partner who is of childbearing age must use reliable birth control during sexual activity while taking this medicine and for 4 months after stopping to prevent pregnancy.

Some patients have serious side effects from this medicine. Ask your pharmacist to show you the information from the Food and Drug Administration (FDA) and discuss it with you.

Side Effects

The following is a list of some common side effects from this medicine. Please speak with your doctor about what you should do if you experience these or other side effects.

• decreased appetite
• constipation or diarrhea
• dry mouth
• nosebleeds
• lack of energy and tiredness
• hair loss
• headaches
• pain, redness, swelling near injection
• mouth sores or irritation
• nausea and vomiting
• pain near injection site
• stomach upset or abdominal pain

Call your doctor or get medical help right away if you notice any of these more serious side effects:

• bleeding or bruising
• wheezing or difficulty breathing
• cough that does not go away
• dizziness
• swelling of the legs, feet, and hands
• fainting
• fever or chills
• pale or blue skin, lips or fingernails
• shortness of breath
• sore throat
• unusual or unexplained tiredness or weakness
• severe or persistent vomiting
• sudden or unexplained weight gain

A few people may have an allergic reaction to this medicine. Symptoms can include difficulty breathing, skin rash, itching, swelling, or severe dizziness. If you notice any of these symptoms, seek medical help quickly.