Dizziness, drowsiness, tiredness, muscle weakness, swelling, watery eyes, diarrhea, loss of appetite, change in how food tastes, stomach/abdominal pain, nausea, or vomiting may occur. Nausea and vomiting can be severe. In some cases, your doctor may prescribe medication to prevent or relieve nausea and vomiting. Eating several small meals, not eating before treatment, or limiting activity may help lessen some of these effects. If any of these effects last or get worse, tell your doctor or pharmacist promptly.
Changes in hair color and temporary hair loss may occur. Normal hair growth should return after treatment has ended.
People using this medication may have serious side effects. However, your doctor has prescribed this drug because he or she has judged that the benefit to you is greater than the risk of side effects. Careful monitoring by your doctor may decrease your risk.
This medication can affect your thinking or mood, which can be serious. Tell your doctor right away if you have any mental/mood changes such as forgetfulness, confusion, trouble thinking clearly, trouble finding words when talking, sleep problems, or hallucinations. Changes in behavior may also occur. Tell your doctor right away if you or a caregiver notice symptoms such as agitation, depression, irritability, or personality changes.
This medication can rarely increase the risk of bleeding in the brain. Get medical help right away if you have any side effects such as severe headache, vision problems, severe drowsiness, or weakness on one side of your body.
This medication may lower your ability to fight infections. This may make you more likely to get a serious (rarely fatal) infection or make any infection you have worse. Tell your doctor right away if you have any signs of infection (such as sore throat that doesn't go away, fever, chills, cough).
Avapritinib can commonly cause a rash that is usually not serious. However, you may not be able to tell it apart from a rare rash that could be a sign of a severe reaction. Get medical help right away if you develop any rash.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.