larotrectinib

What is the most important information I should know about larotrectinib?

Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

What is larotrectinib?

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 this medicine, but further studies are needed.

Larotrectinib may also be used for purposes not listed in this medication guide.

What should I discuss with my healthcare provider before taking larotrectinib?

Tell your doctor if you have ever had:

• liver disease; or
• nerve problems.

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

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.

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.

You may take larotrectinib with or without food.

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.

What happens if I miss a dose?

Use the medicine as soon as you can, but skip the missed dose if your next dose is due in less than 6 hours. Do not use two doses at one time.

What happens if I overdose?

What should I avoid while taking larotrectinib?

Grapefruit may interact with larotrectinib and lead to unwanted side effects. Avoid the use of grapefruit products.

Avoid taking an herbal supplement containing St. John's wort.

What are the possible side effects of larotrectinib?

• 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; or
• 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; or
• abnormal liver function tests.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect larotrectinib?

Sometimes it is not safe to use certain medications at the same time. Some drugs can affect your blood levels of other drugs you take, which may increase side effects or make the medications less effective.

Other drugs may affect larotrectinib, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all your current medicines and any medicine you start or stop using.

Where can I get more information?

Your pharmacist can provide more information about larotrectinib.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

Copyright 1996-2023 Cerner Multum, Inc. Version: 1.01. Revision date: 1/8/2019.