Palbociclib with Enzalutamide Interaction Details
Brand Names Associated with Palbociclib
- Ibrance®
- Palbociclib
Brand Names Associated with Enzalutamide
- Enzalutamide
- Xtandi®
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
Dec 26, 2023
Interaction Effect
Decreased exposure of palbociclib
Interaction Summary
Avoid concomitant use of palbociclib (a CYP3A substrate) and a strong CYP3A inducer, as it may result in a decreased palbociclib exposure. When palbociclib and rifampin (a strong CYP3A inducer) were administered together, the AUC and Cmax of palbociclib decreased 85% and 70%, respectively.
Severity
Major
Onset
Unspecified
Evidence
Theoretical
How To Manage Interaction
Avoid concomitant use of palbociclib (a CYP3A substrate) and a strong CYP3A inducer, as it may result in a decrease in palbociclib exposure.
Mechanism Of Interaction
Induction of CYP3A-mediated palbociclib metabolism
Literature Reports
A) During a drug interaction study in healthy subjects (N=14), coadministration of palbociclib 125 mg/day and multiple doses of rifampin 600 mg/day (a strong CYP3A inducer) resulted in an 85% decrease in palbociclib AUC and a 70% decrease in palbociclib Cmax .
Palbociclib Overview
-
Palbociclib is used in combination with anastrozole (Arimidex), exemestane (Aromasin), or letrozole (Femara) to treat a certain type of hormone receptor–positive, advanced breast cancer (breast cancer that depends on hormones such as estrogen to grow) or breast cancer that has spread to other parts of the body in women who have experienced menopause (change of life; end of monthly menstrual periods) or in men. Palbociclib is also used along with fulvestrant (Faslodex) to treat a certain type of hormone receptor–positive, advanced breast cancer (breast cancer that depends on hormones such as estrogen to grow) or breast cancer that has spread to other parts of the body in people who have been treated with an antiestrogen medication such as tamoxifen (Nolvadex). Palbociclib is in a class of medications called kinase inhibitors. It works by blocking the action of the abnormal protein that signals cancer cells to multiply. This helps stop or slow the spread of cancer cells.
Enzalutamide Overview
-
Enzalutamide is used to treat prostate cancer that has spread to other parts of the body in men and who have been helped by certain medical and surgical treatments that decrease testosterone levels. It is also used to treat prostate cancer in men who have not been helped by certain medical and surgical treatments that decrease testosterone levels. Enzalutamide is in a class of medications called androgen receptor inhibitors. It works by blocking the effects of androgen (a male reproductive hormone) to stop the growth and spread of cancer cells.
Return To Our Drug Interaction Homepage
Feedback, Question Or Comment About This Information?
Ask Dr. Brian Staiger, PharmD, our medical editor, directly! He's always more than happy to assist.
Definitions
Severity Categories
Contraindicated
These drugs, generally, should not be used together simultaneously due to the high risk of severe adverse effects. Combining these medications can lead to dangerous health outcomes and should be strictly avoided unless otherwise instructed by your provider.
Major
This interaction could result in very serious and potentially life-threatening consequences. If you are taking this drug combination, it is very important to be under close medical supervision to minimize severe side effects and ensure your safety. It may be necessary to change a medication or dosage to prevent harm.
Moderate
This interaction has the potential to worsen your medical condition or alter the effectiveness of your treatment. It's important that you are monitored closely and you potentially may need to make adjustments in your treatment plan or drug dosage to maintain optimal health.
Minor
While this interaction is unlikely to cause significant problems, it could intensify side effects or reduce the effectiveness of one or both medications. Monitoring for changes in symptoms and your condition is recommended, and adjustments may be made if needed to manage any increased or more pronounced side effects.
Onset
Rapid: Onset of drug interaction typically occurs within 24 hours of co-administration.
Delayed: Onset of drug interaction typically occurs more than 24 hours after co-administration.
Evidence
Level of documentation of the interaction.
Established: The interaction is documented and substantiated in peer-reviewed medical literature.
Theoretical: This interaction is not fully supported by current medical evidence or well-documented sources, but it is based on known drug mechanisms, drug effects, and other relevant information.
How To Manage The Interaction
Provides a detailed discussion on how patients and clinicians can approach the identified drug interaction as well as offers guidance on what to expect and strategies to potentially mitigate the effects of the interaction. This may include recommendations on adjusting medication dosages, altering the timing of drug administration, or closely monitoring for specific symptoms.
It's important to note that all medical situations are unique, and management approaches should be tailored to individual circumstances. Patients should always consult their healthcare provider for personalized advice and guidance on managing drug interactions effectively.
Mechanism Of Interaction
The theorized or clinically determined reason (i.e., mechanism) why the drug-drug interaction occurs.
Disclaimer: The information provided on this page is for informational purposes only and should not be considered medical advice. Always consult with a qualified healthcare professional regarding your specific circumstances and medical conditions.
Where Does Our Information Come From?
Information for our drug interactions is compiled from several drug compendia, including:
The prescribing information for each drug, as published on DailyMED, is also used.
Individual drug-drug interaction detail pages contain references specific to that interaction. You can click on the reference number within brackets '[]' to see what reference was utilized.
The information posted is fact-checked by HelloPharmacist clinicians and reviewed quarterly.