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Larotrectinib Side Effects

Medically reviewed by Last updated on Aug 14, 2020.

For the Consumer

Applies to larotrectinib: oral capsule, oral solution

Side effects requiring immediate medical attention

Along with its needed effects, larotrectinib may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking larotrectinib:

More common

  • Black, tarry, stools
  • bloating or swelling of the face, arms, hands, lower legs, or feet
  • blurred vision
  • chills
  • cough
  • dizziness
  • falls
  • fever
  • headache
  • lower back or side pain
  • nervousness
  • painful or difficult urination
  • pale skin
  • pounding in the ears
  • rapid weight gain
  • slow or fast heartbeat
  • sore throat
  • tightness in the chest
  • tingling of the hands or feet
  • troubled breathing
  • troubled breathing with exertion
  • ulcers, sores, or white spots in the mouth
  • unusual bleeding or bruising
  • unusual tiredness or weakness
  • unusual weight gain or loss

Less common

  • Chest pain or discomfort
  • chills
  • confusion
  • decreased urination
  • diarrhea
  • dry mouth
  • fainting
  • heartburn
  • increase in heart rate
  • increased thirst
  • indigestion
  • irregular heartbeat
  • itching, pain, redness, swelling, tenderness, or warmth on the skin
  • lightheadedness
  • loss of consciousness
  • muscle pain, cramps, or weakness
  • nausea
  • problems with movement, walking, or speech
  • rapid, shallow breathing
  • seizures
  • severe abdominal pain, cramping, or burning
  • stomach pain
  • sunken eyes
  • swelling of the face, ankles, or hands
  • vomiting
  • vomiting of material that looks like coffee grounds, severe and continuing
  • wrinkled skin
  • yellow skin or eyes

Side effects not requiring immediate medical attention

Some side effects of larotrectinib may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  • Back pain
  • constipation
  • decreased appetite
  • difficulty in moving
  • increased weight
  • joint pain or swelling
  • muscle stiffness
  • pain in the arms or legs
  • stuffy nose

Less common

  • Lack or loss of strength

For Healthcare Professionals

Applies to larotrectinib: oral capsule, oral solution


Very common (10% or more): Anemia (42%), hypoalbuminemia (35%), neutropenia (23%)[Ref]


Very common (10% or more): Arthralgia (14%), myalgia (14%), muscular weakness (13%), back pain (12%), pain in extremity (12%)[Ref]


Very common (10% or more): Peripheral edema (15%), increased weight (15%), decreased appetite (13%)[Ref]


Common (1% to 10%): Delirium, memory impairment[Ref]


Very common (10% or more): Hepatotoxicity (45%), Increased ALT (45%), increased AST (45%), increased alkaline phosphatase (30%)[Ref]


Very common (10% or more): Cough (26%), dyspnea (18%), nasal congestion (10%)[Ref]


Very common (10% or more): Fatigue (37%), pyrexia (18%), fall (10%)[Ref]


The most common adverse reactions (20% or greater) were fatigue, nausea, dizziness, vomiting, anemia, increased AST, cough, increased ALT, constipation, and diarrhea.[Ref]

Nervous system

Very common (10% or more): Neurotoxicity (53%), dizziness (28%), headache (14%)

Common (1% to 10%): Dysarthria, gait disturbance, tremor, paresthesia

Uncommon (0.1% to 1%): Grade 4 encephalopathy[Ref]


Very common (10% or more): Hypertension (11%)[Ref]


Very common (10% or more): Nausea (29%), vomiting (26%), constipation (23%), diarrhea (22%), abdominal pain (13%)[Ref]


1. "Product Information. Vitrakvi (larotrectinib)." Bayer Pharmaceutical Inc, West Haven, CT.

Frequently asked questions

Further information

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

Some side effects may not be reported. You may report them to the FDA.