Drug Interactions between docetaxel and ivacaftor / lumacaftor

Ivacaftor may increase the blood levels of DOCEtaxel. This may increase the risk of side effects such as nausea, vomiting, diarrhea, mouth sores, fluid retention, nerve pain, numbness, tingling, and muscle pain or weakness. You may also be more likely to develop anemia, bleeding problems, or infections due to low blood cell counts. Talk to your doctor if you have any questions or concerns. Your doctor may be able to prescribe alternatives that do not interact, or you may need a dose adjustment or more frequent monitoring to safely use both medications. You should contact your doctor if you develop paleness, fatigue, dizziness, fainting, unusual bruising or bleeding, fever, chills, diarrhea, sore throat, muscle aches, shortness of breath, blood in phlegm, weight loss, red or inflamed skin, body sores, and pain or burning during urination. 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.

Consumer information for this interaction is not currently available.

GENERALLY AVOID: Coadministration with inducers of CYP450 3A4 may decrease the plasma concentrations of docetaxel, which is a substrate of the isoenzyme. Rifampin and hyperforin, a component of St. John's wort, have been shown to significantly induce the in vitro metabolism of docetaxel in human hepatocyte cultures. However, clinical pharmacokinetic studies are lacking.

MANAGEMENT: Coadministration of docetaxel with potent CYP450 3A4 inducers such as carbamazepine, dexamethasone, enzalutamide, phenobarbital, phenytoin, rifamycins, and St. John's wort should generally be avoided unless the benefit outweighs the potential risk of docetaxel underexposure. Alternative agents with no or minimal CYP450 3A4 induction potential are recommended whenever possible. If concomitant use is required, close monitoring for signs of reduced therapeutic efficacy is advised. Other known inducers include aminoglutethimide, barbiturates, bexarotene, bosentan, dabrafenib, efavirenz, etravirine, nafcillin, nevirapine, somatrem, somatropin, and various other anticonvulsants, although the extent to which they interact with docetaxel is unknown.