Uses
Tucatinib is used with trastuzumab (Herceptin) and capecitabine (Xeloda) to treat a certain type of hormone-receptor-positive breast cancer that has spread to other parts of the body and cannot be treated with surgery in adults who have already been treated with at least one other chemotherapy medication. Tucatinib is in a class of medications called kinase inhibitors. It works by blocking the action of the abnormal protein that signals cancer cells to multiply. This helps stop or slow the spread of cancer cells.
Side Effects Of Tucatinib
Tucatinib may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
- nausea
- vomiting
- abdominal pain
- loss of appetite
- weight loss
- fatigue
- rash
- headache
- mouth ulcers
- nose bleeding
- numbness, burning or tingling in the hands or feet
- joint pain
- redness or blisters on hands or feet
- pale skin, fatigue, or shortness of breath
Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately or get emergency medical treatment:
- diarrhea
- pain or discomfort in right upper stomach area; loss of appetite; bleeding or bruising more easily than normal; yellowing of skin and eyes; fatigue; or dark urine
- seizure
Tucatinib may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.
Warnings & Precautions
Before taking tucatinib:
- tell your doctor and pharmacist if you are allergic to tucatinib, any other medications, or any of the ingredients in tucatinib tablets. Ask your pharmacist for a list of the ingredients.
- tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: digoxin (Lanoxin), gemfibrozil (Lopid), itraconazole (Onmel, Sporanox), metformin (Fortamet, Glucophage, Glumetza, Riomet), midazolam, repaglinide (Prandin), and rifampin (Rifadin, Rimactane, in Rifamate, in Rifater). Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with tucatinib, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
- tell your doctor what herbal products you are taking, especially St. John’s wort.
- tell your doctor if you have or have ever had liver or kidney disease.
- tell your doctor if you are pregnant, plan to become pregnant, or if you plan on fathering a child. If you are female, you will need to take a pregnancy test before you start treatment and use birth control to prevent pregnancy during your treatment and for at least 1 week after your final dose. If you are a male, you and your partner should use birth control during your treatment and for 1 week after your final dose. Talk to your doctor about birth control methods that you can use during your treatment. If you or your partner become pregnant while taking tucatinib, call your doctor immediately. Tucatinib may harm the fetus.
- tell your doctor if you are breastfeeding. You should not breastfeed while you are taking tucatinib and for 1 week after your final dose.
- you should know that this medication may decrease fertility in men and women. Talk to your doctor about the risks of taking tucatinib.
Tucatinib Dosage
Tucatinib comes as a tablet to take by mouth. It is usually taken with or without food twice daily, about 12 hours apart. Take tucatinib at around the same times every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take tucatinib exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Swallow the tablets whole; do not split, chew, or crush them. Do not take tablets that are broken, cracked, or damaged in any way.
If you vomit after taking tucatinib, do not take another dose. Continue your regular dosing schedule.
Your doctor may decrease your dose or temporarily or permanently stop your treatment if you experience certain side effects. This depends on how well the medication works for you and the side effects you experience. Be sure to tell your doctor how you are feeling during your treatment with tucatinib.
Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient.
Other
Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests before and during your treatment to check your body’s response to tucatinib.
Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.
It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.
Source
All information has been provided courtesy of MedLinePlus from the National Library of Medicine and from the FDA.
