Tucatinib (tucatinib) — Uses, Dosage, Side Effects & Safety

Drug class: Tyrosine kinase inhibitor (HER2 inhibitor)

Overview

Tucatinib is a prescription medication used to treat adults with advanced or metastatic HER2-positive breast cancer, often in combination with other cancer medicines such as trastuzumab and capecitabine. It is especially used when the cancer has spread to other parts of the body, including the brain, and has already been treated with other anti-HER2 therapies. Tucatinib works by blocking the activity of HER2, a protein that can promote the growth of cancer cells. By targeting this protein, tucatinib helps slow or stop the growth of HER2-positive cancer cells. Key points for patients: Take tucatinib exactly as prescribed, usually twice daily. It is important to continue taking the medication even if you feel well, unless your doctor tells you to stop. Regular monitoring and follow-up with your healthcare provider are essential to manage side effects and ensure the medicine is working effectively.

Therapeutic uses

  • HER2-positive metastatic breast cancer
  • HER2-positive locally advanced breast cancer
  • HER2-positive metastatic colorectal cancer

Common side effects

  • Diarrhea
  • Nausea
  • Fatigue
  • Vomiting
  • Abdominal pain
  • Increased liver enzymes
  • Hand-foot syndrome

Frequently Asked Questions about Tucatinib

What is tucatinib used for?

Tucatinib is used to treat adults with advanced or metastatic HER2-positive breast cancer, often in combination with other medications, especially when the cancer has spread to other parts of the body, including the brain.

How does tucatinib work?

Tucatinib works by blocking the HER2 protein on cancer cells, which helps slow or stop the growth of HER2-positive cancer cells.

What are the most common side effects of tucatinib?

The most common side effects include diarrhea, nausea, vomiting, fatigue, decreased appetite, and hand-foot syndrome.

Can tucatinib be used in children?

Tucatinib is not recommended for use in children under 18 years, as safety and efficacy have not been established in this age group.

What should I do if I miss a dose?

If you miss a dose, take it as soon as you remember unless it is less than 8 hours before your next scheduled dose. If it is less than 8 hours, skip the missed dose and take your next dose at the regular time.

Are there any foods or medicines I should avoid while taking tucatinib?

Avoid grapefruit and grapefruit juice, and do not take tucatinib with strong CYP3A4 inducers or inhibitors. Always inform your healthcare provider about all medicines and supplements you are taking.

Is tucatinib safe during pregnancy or breastfeeding?

Tucatinib is not recommended during pregnancy or breastfeeding due to potential risks to the baby. Use effective contraception during treatment and for at least 1 week after the last dose.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.