Larotrectinib: Uses & Sides Effects

Larotrectinib is used to treat certain tumors that are caused by an abnormal “NTRK” gene. Larotrectinib is used when the cancer has spread to other parts of the body or cannot be removed with surgery or other cancer treatments.

Larotrectinib is sometimes given after other cancer treatments did not work or have stopped working.

Larotrectinib was approved by the US Food and Drug Administration (FDA) on an “accelerated” basis. In clinical studies, some people responded to larotrectinib, but further studies are needed.

How should I take larotrectinib?

Your doctor will perform a test to make sure larotrectinib is the right treatment for your type of tumor.

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Take this medicine with a full glass of water.

You may take larotrectinib with or without food.

Swallow the capsule whole and do not crush, chew, break, or open it.

Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).

Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you do not understand these instructions.

You will need frequent medical tests to check your liver function.

Your doctor will determine how long to treat you with larotrectinib.

If you vomit shortly after taking larotrectinib, do not take another dose. Wait until your next scheduled dose time to take the medicine again.

Store the capsules at room temperature, away from moisture and heat.

Store the liquid medicine in the refrigerator, do not freeze. Throw away any unused liquid after 90 days.


Tell your doctor if you have ever had:

  • liver disease;
  • nerve problems.

You may need to have a negative pregnancy test before starting this treatment.

Both men and women using larotrectinib should use effective birth control to prevent pregnancy. Larotrectinib can harm an unborn baby or cause birth defects if the mother or father is using this medicine. Keep using birth control for at least 1 week after your last dose.

This medicine may affect fertility (ability to have children) in women. However, it is important to use birth control to prevent pregnancy because larotrectinib can harm an unborn baby.

Do not breast-feed while using this medicine, and for at least 1 week after your last dose.

Side Effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • severe or ongoing stomach pain, vomiting, or diarrhea;
  • confusion, memory problems, severe dizziness;
  • problems with speech or coordination;
  • numbness, tingling, or burning pain in your hands or feet;
  • fever, flu symptoms, sore throat, cough;
  • sores or ulcers in your mouth or on your skin;
  • unusual tiredness, feeling light-headed or short of breath;
  • pale skin, cold hands and feet;
  • pain, warmth, redness, or swelling under your skin;
  • liver problems–loss of appetite, stomach pain (upper right side), nausea, vomiting, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Your cancer treatments may be delayed or permanently discontinued if you have certain side effects.

Common side effects may include:

  • nausea, vomiting, diarrhea, constipation;
  • cough;
  • dizziness;
  • tiredness;
  • abnormal liver function tests.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Keyword: larotrectinib.

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.