Tucatinib Tablets

What is this medication?

TUCATINIB (too KA ti nib) treats breast cancer and colorectal cancer. It works by blocking a protein that causes cancer cells to grow and multiply. This helps to slow or stop the spread of cancer cells.

This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.

COMMON BRAND NAME(S): TUKYSA

What should I tell my care team before I take this medication?

They need to know if you have any of these conditions:

• Liver disease
• An unusual or allergic reaction to tucatinib, other medications, foods, dyes or preservatives
• Pregnant or trying to get pregnant
• Breast-feeding

How should I use this medication?

Take this medication by mouth. Take it as directed on the prescription label at the same time every day. Do not cut, crush, or chew this medication. Swallow the tablets whole. You can take it with or without food. If it upsets your stomach, take it with food. Keep taking it unless your care team tells you to stop.

Talk to your care team about the use of this medication in children. Special care may be needed.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.

NOTE: This medicine is only for you. Do not share this medicine with others.

What if I miss a dose?

If you miss a dose, skip it. Take your next dose at the normal time. Do not take extra or 2 doses at the same time to make up for the missed dose.

What may interact with this medication?

Do not take this medication with any of the following medications:

• Alfuzosin
• Alprazolam
• Certain medications for cholesterol, such as lovastatin, simvastatin
• Conivaptan
• Dronedarone
• Eletriptan
• Eplerenone
• Ergot alkaloids, such as dihydroergotamine or ergotamine
• Finerenone
• Flibanserin
• Isavuconazonium
• Ivabradine
• Lomitapide
• Lonafarnib
• Lurasidone
• Mavacamten
• Naloxegol
• Pacritinib
• Pimozide
• Ranolazine
• Silodosin
• Tolvaptan
• Triazolam
• Ubrogepant
• Voclosporin

This medication may also interact with the following:

• Digoxin
• Gemfibrozil
• Midazolam
• Rifampin

This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.

What should I watch for while using this medication?

This medication may make you feel generally unwell. This is not uncommon as chemotherapy can affect healthy cells as well as cancer cells. Report any side effects. Continue your course of treatment even though you feel ill unless your care team tells you to stop.

Talk to your care team if you wish to become pregnant or think you might be pregnant. This medication can cause serious birth defects if taken during pregnancy or for 1 week after stopping therapy. A negative pregnancy test is required before starting this medication. A reliable form of contraception is recommended while taking this medication and for 1 week after stopping therapy. Talk to your care team about reliable forms of contraception.

Use a condom during sex and for 1 week after stopping therapy. Tell your care team right away if you think your partner might be pregnant. This medication can cause serious birth defects.

Do not breast-feed while taking this medication and for 1 week after stopping therapy.

This medication may cause infertility. Talk to your care team if you are concerned about your fertility.

What side effects may I notice from receiving this medication?

Side effects that you should report to your care team as soon as possible:

• Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
• Liver injury—right upper belly pain, loss of appetite, nausea, light-colored stool, dark yellow or brown urine, yellowing skin or eyes, unusual weakness or fatigue

Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome):

• Diarrhea
• Fatigue
• Nausea
• Skin rash
• Stomach pain
• Vomiting

This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Where should I keep my medication?

Keep out of the reach of children and pets.

Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Keep this medicine in the original container until you are ready to take it. Protect from moisture. Keep the container tightly closed. Do not throw out the packet in the container. It keeps the medication dry. Get rid of any unused medication after it expires or 3 months after opening, whichever is first.

To get rid of medications that are no longer needed or have expired:

• Take the medication to a medication take-back program. Check with your pharmacy or local law enforcement to find a location.
• If you cannot return the medication, check the label or package insert to see if the medication should be thrown out in the garbage or flushed down the toilet. If you are not sure, ask your care team. If it is safe to put in the trash, empty the medication out of the container. Mix the medication with cat litter, dirt, coffee grounds, or other unwanted substance. Seal the mixture in a bag or container. Put it in the trash.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.