Drug Interaction Report

Entrectinib may increase the blood levels and effects of levobupivacaine. Before you receive levobupivacaine, let your doctor know if you have been using entrectinib. You may need a dose adjustment or closer monitoring by your doctor to safely use both medications. Let your doctor know if you experience dizziness, lightheadedness, anxiety, restlessness, tremors, twitching, numbness and tingling of the mouth and lips, metallic taste, ringing in the ears or blurred vision, , as these may be early symptoms of excessive levobupivacaine levels. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Do not consume grapefruit, grapefruit juice, or Seville oranges during treatment with entrectinib. Doing so can significantly increase the blood levels of entrectinib and increase the risk and/or severity of side effects such as dizziness; confusion; hallucinations; problems with concentration, attention, thinking, and memory; mood changes; insomnia; drowsiness; liver problems; increased uric acid levels in the blood (hyperuricemia); congestive heart failure; fluid retention and swelling; changes in electrical activity of the heart (a condition known as QT prolongation, which may lead to irregular heart rhythm that can be life-threatening); vision problems; and low red or white blood cell counts. Talk to your doctor if you have any questions or concerns. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.