Drug interactions
Famotidine + Neratinib
Severity: Major
Famotidine and Neratinib: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Neratinib solubility falls as gastric pH rises, and famotidine increases pH. Exposure to neratinib can drop substantially, potentially weakening treatment efficacy.
What this interaction means in plain words
Famotidine and Neratinib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Famotidine belongs to Gastrointestinal Tract; Neratinib belongs to Oncology.
Why it happens
Higher gastric pH reduces the pH-dependent solubility and absorption of neratinib.
What to do
Take neratinib at least 2 hours before the next dose of famotidine, or 10 hours after it; avoid proton pump inhibitors.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Famotidine
Other interactions of Neratinib
- Amiodarone + Neratinib Major
- Amobarbital + Neratinib Major
- Aprepitant + Neratinib Major
- Armodafinil + Neratinib Major
- Bosentan + Neratinib Major
- Carbamazepine + Neratinib Major
Frequently asked questions
Can I take Famotidine with Neratinib?
MediHelp rates the interaction as major. Famotidine and Neratinib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Neratinib solubility falls as gastric pH rises, and famotidine increases pH. Exposure to neratinib can drop substantially, potentially weakening treatment efficacy.
How serious is the interaction between Famotidine and Neratinib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Take neratinib at least 2 hours before the next dose of famotidine, or 10 hours after it; avoid proton pump inhibitors.
What other medicines interact with Famotidine?
MediHelp also lists interactions of Famotidine with, for example, Atazanavir, Dasatinib, Infigratinib. The full list is on the Famotidine page.
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