Drug Interaction Report

Entrectinib may reduce the blood levels and effectiveness of dienogest, which may make it less reliable as a form of birth control. Alternative or additional methods of birth control such as condoms should be used during treatment with entrectinib and for up to 5 weeks after stopping treatment to avoid unintended pregnancy. Talk to your gynecologist or other healthcare professional for help in selecting an effective method of birth control that is best for you. Men receiving entrectinib should also use a condom during the treatment period and for 3 months after stopping treatment. 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.

Grapefruit juice may increase the blood levels of certain medications such as dienogest. You may want to limit your consumption of grapefruit and grapefruit juice during treatment with dienogest. However, if you have been regularly consuming grapefruit or grapefruit juice with the medication, then it is advisable for you to talk with your doctor before changing the amounts of these products in your diet, as this may alter the effects of your medication. Contact your doctor if your condition changes or you experience increased side effects. Orange juice is not expected to interact.

Information for this minor interaction is available on the professional version.