Neratinib with Famotidine Interaction Details


Brand Names Associated with Neratinib

  • Neratinib
  • Nerlynx®

Brand Names Associated with Famotidine

  • Duexis® (as a combination product containing Famotidine, Ibuprofen)
  • Famotidine
  • Fluxid®
  • Pepcid®
  • Pepcid® AC
  • Pepcid® Complete (as a combination product containing Calcium Carbonate, Famotidine, Magnesium Hydroxide)
  • Pepcid® RPD

Medical Content Editor
Last updated Dec 29, 2023


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Interaction Effect

Decreased neratinib solubility, absorption, and exposure


Interaction Summary

Coadministration of neratinib with agents that increase the gastric pH, such as an H2-receptor antagonist, may result in a decrease in neratinib plasma concentration and AUC resulting in reduced efficacy. A single oral dose of neratinib 240 mg given 2 hours following a dose of ranitidine 300 mg, resulted in a decrease in the neratinib Cmax by 57% and AUC by 48%. Give neratinib at least 2 hours before the next dose of the H2-receptor antagonist or 10 hours after the H2-receptor antagonist.


Severity

Major


Onset

Unspecified


Evidence

Probable


How To Manage Interaction

Coadministration of neratinib with agents that increase the gastric pH, such as an H2-receptor antagonist, may result in a decrease in neratinib plasma concentration and AUC resulting in reduced efficacy. Give neratinib at least 2 hours before the next dose of the H2-receptor antagonist or 10 hours after the H2-receptor antagonist.


Mechanism Of Interaction

Increased gastric pH by the H2-receptor antagonist


Literature Reports

A) A single oral dose of neratinib 240 mg given 2 hours following a dose of ranitidine 300 mg, resulted in a decrease in the neratinib Cmax by 57% and AUC by 48%. When a single oral dose of neratinib 240 mg was administered 2 hours prior to ranitidine 150 mg twice daily (administered in the morning and evening, approximately 12 hours apart), the neratinib Cmax and AUC were reduced by 44% and 32%, respectively .

Neratinib Overview

  • Neratinib is used to treat a certain type of hormone receptor-positive breast cancer (breast cancer that depends on hormones such as estrogen to grow) in adults after treatment with trastuzumab (Herceptin) and other medications. Neratinib is used along with capecitabine (Xeloda) to treat a certain type of advanced hormone receptor-positive breast cancer or breast cancer that has spread to other parts of the body after treatment with at least two other medications. Neratinib is in a class of medications called kinase inhibitors. It works by blocking the action of an abnormal protein that signals cancer cells to multiply. This helps slow or stop the spread of cancer cells.

See More information Regarding Neratinib

Famotidine Overview

  • Prescription famotidine is used to treat ulcers (sores on the lining of the stomach or small intestine); gastroesophageal reflux disease (GERD, a condition in which backward flow of acid from the stomach causes heartburn and injury of the esophagus [tube that connects the mouth and stomach]); and conditions where the stomach produces too much acid, such as Zollinger-Ellison syndrome (tumors in the pancreas or small intestine that cause increased production of stomach acid). Over-the-counter famotidine is used to prevent and treat heartburn due to acid indigestion and sour stomach caused by eating or drinking certain foods or drinks. Famotidine is in a class of medications called H2 blockers. It works by decreasing the amount of acid made in the stomach.

See More information Regarding Famotidine

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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.