Tucatinib tablets

What is this medication?

TUCATINIB (too KA ti nib) is a medicine that targets proteins in cancer cells and stops the cancer cells from growing. It is used to treat some advanced breast cancers. It is used along with other cancer treatments.

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 medicines, foods, dyes or preservatives
• pregnant or trying to get pregnant
• breast-feeding

How should I use this medication?

Take this medicine by mouth with a glass of water. Follow the directions on the prescription label. Do not cut, crush or chew this medicine. Swallow the tablets whole. You can take it with or without food. If it upsets your stomach, take it with food. Do not take with grapefruit juice. Take your medicine at regular intervals. Do not take it more often than directed. Do not stop taking except on your doctor's advice.

Talk to your pediatrician about the use of this medicine 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, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.

What may interact with this medication?

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

• alfuzosin
• certain medicines for cholesterol like lovastatin or simvastatin
• conivaptan
• dronedarone
• eletriptan
• eplerenone
• ergot alkaloids like dihydroergotamine or ergotamine
• flibanserin
• isavuconazonium
• ivabradine
• lomitapide
• lurasidone
• naloxegol
• pimozide
• ranolazine
• silodosin
• tolvaptan
• triazolam
• ubrogepant

This medicine may also interact with the following medications:

• certain medicines for seizures like carbamazepine, phenobarbital, phenytoin
• clopidogrel
• digoxin
• gemfibrozil
• midazolam
• rifampin
• St. Johns Wort

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?

Visit your health care professional for regular checks on your progress. Tell your health care professional if your symptoms do not start to get better or if they get worse.

Do not become pregnant while taking this medicine or for 1 week after stopping it. Women should inform their health care professional if they wish to become pregnant or think they might be pregnant. Men should not father a child while taking this medicine and for 1 week after stopping it. There is potential for serious side effects to an unborn child. Talk to your health care professional for more information.

Do not breast-feed a child while taking this medicine or for 1 week after stopping it.

This medicine has caused ovarian failure in some women. This medicine may make it more difficult to get pregnant. Talk to your health care professional if you are concerned about your fertility.

This medicine has caused decreased sperm counts in some men. This may make it more difficult to father a child. Talk to your health care professional 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 doctor or health care professional as soon as possible:

• diarrhea
• signs and symptoms of liver injury like dark yellow or brown urine; general ill feeling or flu-like symptoms; light-colored stools; loss of appetite; nausea; right upper belly pain; unusually weak or tired; yellowing of the eyes or skin

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

• joint pain
• nausea, vomiting
• mouth sores
• pain, tingling, numbness in the hands or feet
• rash
• signs and symptoms of low red blood cells or anemia such as unusually weak or tired; feeling faint or lightheaded; falls; breathing problems

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.

Store between 20 and 25 degrees C (68 and 77 degrees F). Keep this medicine in the original container. Do not throw out the packet in the container. It keeps the medicine dry.

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.