Tafinlar (dabrafenib)

Tafinlar® is a treatment used in combination with Mekinist® (trametinib) for metastatic non-small cell lung cancer (NSCLC) with the BRAF V600E mutation. Tafinlar is a kinase inhibitor and is also used in the treatment of unresectable or metastatic melanoma with the BRAF V600E mutation.1

What are the ingredients in Tafinlar?

The active ingredient in Tafinlar is dabrafenib. Tafinlar also contains the inactive ingredients colloidal silicon dioxide, magnesium stearate, and microcrystalline cellulose, and the capsule shells are made of hypromellose, red iron oxide (E172), and titanium dioxide (E171).1

How does Tafinlar work?

The BRAF V600E mutation is a specific change in the BRAF gene that has been found in some types of cancer, including NSCLC, melanoma, and colorectal cancer. The BRAF gene normally makes a protein that is involved in cell growth, and the mutation may increase the growth and spread of cancer cells.2

Tafinlar is an inhibitor of the protein that is created from the BRAF V600E mutation. When used in combination with Mekinist, the two medications block different proteins along the same pathway that leads to the growth of cancer cells. By blocking these proteins, the combination of Tafinlar and Mekinist inhibit the growth of the cancer.1

What are the possible side effects of Tafinlar?

Tafinlar may cause serious side effects, including increasing the risk of developing new cancers. When used alone or with Mekinist, Tafinlar may cause skin cancers such as cutaneous squamous cell carcinoma, new melanoma lesions, or basal cell carcinoma. Tafinlar may also cause other (non-skin) cancers.1,3

Tafinlar can cause serious bleeding issues, including brain or stomach bleeds, and this can lead to death. Seek immediate medical attention if you have any signs of bleeding, including:

  • Headaches
  • Dizziness
  • Feeling weak
  • Coughing up blood or blood clots
  • Vomiting blood (may look like coffee grinds)
  • Red or black stools (may look like tar)3

Tafinlar can cause heart problems, including heart failure. Your doctor should check your heart function before and during treatment with Tafinlar. Call your doctor if you have any signs of a heart problem, including:

  • Racing heartbeat
  • Shortness of breath
  • Swelling in the feet or ankles
  • Lightheadedness3

Tafinlar can cause serious eye problems, and some can lead to blindness. Call your doctor if you have any signs of eye problems, including:

  • Blurry vision, loss of vision, or other changes
  • Seeing colored dots
  • Seeing a halo around objects
  • Eye pain, swelling, or redness3

Tafinlar frequently causes a fever. Occasionally, a fever can be serious, if it causes dehydration, low blood pressure, dizziness, or kidney problems. Tell your doctor right away if you experience a fever with Tafinlar.3

Tafinlar can cause serious skin reactions, like a rash. Call your doctor if you have any signs of skin reactions, including:

  • A rash or redness that bothers you or doesn’t go away
  • Acne
  • Redness, swelling, peeling, or tenderness of the hands or feet3

Tafinlar can cause increased blood sugar (hyperglycemia). If you have diabetes, you will need to check your blood sugar levels closely, as Tafinlar may worsen your diabetes. Call your doctor if you have any signs of severe high blood sugar, including:

  • Increased thirst
  • Urinating more frequently or urinating an increased amount of urine3

Tafinlar can cause hemolytic anemia in people with G6PD deficiency. Call your doctor if you have any signs of anemia, including:

  • Jaundice (yellow skin or eyes)
  • Weakness
  • Dizziness
  • Shortness of breath3

The most common side effects experienced by patients in clinical trials taking Tafinlar include:

  • Fever
  • Fatigue
  • Nausea
  • Vomiting
  • Swelling of the face, arms, and legs
  • Chills
  • Bleeding
  • Diarrhea
  • Dry skin
  • Decreased appetite
  • Rash
  • Cough
  • Shortness of breath3

Tafinlar can cause fertility problems in women, which may affect your ability to become pregnant.3

Tafinlar can cause low sperm counts in men, which can affect your ability to father a child.3

Things to know about Tafinlar

Tafinlar should only be used in people who have the BRAF V600E mutation. Your doctor will perform a test to see if your NSCLC has this mutation.3

Because of the increased risk of developing some kinds of skin cancer, you should have your skin checked by a doctor before starting treatment with Tafinlar, every two months during treatment, and for up to six months after you stop taking Tafinlar for any new skin cancers. In addition, you should check your skin regularly and contact your doctor if you see any skin changes, such as a new wart, a sore or reddish bump that bleeds or doesn’t heal, or a change in the size or color of a mole.1,3

Before starting treatment with Tafinlar, talk to your doctor about all your health conditions, including:

  • Bleeding problems
  • Heart (cardiovascular) problems
  • Eye problems
  • Liver or kidney problems
  • Diabetes
  • Plans to have surgery, dental, or other medical procedures
  • Deficiency of the glucose-6-phosphate dehydrogenase (G6PD) enzyme
  • Pregnancy or planning to become pregnant1,3

Talk to your doctor about all medications you are taking, including prescription and over-the-counter medicines, vitamins, and herbal supplements. Tafinlar may change how other medicines work, and certain combinations of medicine can cause side effects.3

Tafinlar can harm an unborn baby (during pregnancy) and should not be taken by women who are pregnant or are planning to become pregnant. Women who are able to become pregnant should use effective birth control during treatment with Tafinlar and for at least four months after the last dose of Tafinlar and Mekinist. Hormonal birth control methods, like birth control pills, injections, or patches, may not work as well during treatment with Tafinlar, so another form of birth control should be used.1,3

It isn’t known if Tafinlar can pass into breast milk. Talk to your doctor if you are breastfeeding or plan to breastfeed. It is recommended that you do not breastfeed during treatment with Tafinlar and for at least four months after the last dose of Tafinlar and Mekinist.1,3

Tafinlar should only be used in adults, as it is not known if Tafinlar is safe or effective for use in children.3

Dosing information

Tafinlar is available in 50 mg and 75 mg capsules. The recommended dose is 150 mg taken by mouth twice daily (along with Mekinist). The medication should be taken at least one hour before or two hours after a meal. The two doses of medication should be taken approximately 12 hours apart.1

For more information, read the full prescribing information for Taflinlar.

Written by: Emily Downward | Last reviewed: October 2017.
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