Drug interactions
Erlotinib + Vonoprazan
Severity: Major
Erlotinib and Vonoprazan: 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
Erlotinib absorption depends on an acidic gastric pH, and vonoprazan produces potent, lasting acid suppression. Erlotinib exposure may fall substantially, reducing efficacy.
What this interaction means in plain words
Erlotinib and Vonoprazan 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.
Erlotinib belongs to Oncology; Vonoprazan belongs to Gastrointestinal Tract.
Why it happens
Higher gastric pH from vonoprazan reduces the solubility and absorption of erlotinib.
What to do
Avoid vonoprazan and other potent acid suppressants where possible. If acid suppression is essential, monitor for reduced response to erlotinib.
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 Erlotinib
- Amobarbital + Erlotinib Major
- Apalutamide + Erlotinib Major
- Carbamazepine + Erlotinib Major
- Cobicistat + Erlotinib Major
- Darunavir + Erlotinib Major
- Dexlansoprazole + Erlotinib Major
Other interactions of Vonoprazan
- Amobarbital + Vonoprazan Major
- Apalutamide + Vonoprazan Major
- Atazanavir + Vonoprazan Major
- Carbamazepine + Vonoprazan Major
- Phenytoin + Vonoprazan Major
- Armodafinil + Vonoprazan Moderate
Frequently asked questions
Can I take Erlotinib with Vonoprazan?
MediHelp rates the interaction as major. Erlotinib and Vonoprazan 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. Erlotinib absorption depends on an acidic gastric pH, and vonoprazan produces potent, lasting acid suppression. Erlotinib exposure may fall substantially, reducing efficacy.
How serious is the interaction between Erlotinib and Vonoprazan?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid vonoprazan and other potent acid suppressants where possible. If acid suppression is essential, monitor for reduced response to erlotinib.
What other medicines interact with Erlotinib?
MediHelp also lists interactions of Erlotinib with, for example, Amobarbital, Apalutamide, Carbamazepine. The full list is on the Erlotinib page.
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