Drug interactions
Pantoprazole + Phenytoin
Severity: Minor
Pantoprazole and Phenytoin: minor 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
Phenytoin may lower pantoprazole exposure and reduce acid suppression. Proton pump inhibitors may also modestly change phenytoin levels, though pantoprazole is least likely to do so.
What this interaction means in plain words
Pantoprazole and Phenytoin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Pantoprazole belongs to Gastrointestinal Tract; Phenytoin belongs to Central Nervous System.
Why it happens
Phenytoin induces CYP2C19 and CYP3A4, increasing pantoprazole metabolism.
What to do
Monitor for reduced acid control and increase the pantoprazole dose if symptoms persist. Check phenytoin levels if toxicity or loss of seizure control occurs.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Phenytoin
- Artemether / lumefantrine + Phenytoin Contraindicated
- Bictegravir + Phenytoin Contraindicated
- Cabotegravir + Phenytoin Contraindicated
- Doravirine + Phenytoin Contraindicated
- Elbasvir / grazoprevir + Phenytoin Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Phenytoin Contraindicated
Other interactions of Pantoprazole
- Pantoprazole + Rilpivirine Contraindicated
- Acalabrutinib + Pantoprazole Major
- Atazanavir + Pantoprazole Major
- Dacomitinib + Pantoprazole Major
- Dasatinib + Pantoprazole Major
- Erlotinib + Pantoprazole Major
Frequently asked questions
Can I take Pantoprazole with Phenytoin?
MediHelp rates the interaction as minor. Pantoprazole and Phenytoin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Phenytoin may lower pantoprazole exposure and reduce acid suppression. Proton pump inhibitors may also modestly change phenytoin levels, though pantoprazole is least likely to do so.
How serious is the interaction between Pantoprazole and Phenytoin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for reduced acid control and increase the pantoprazole dose if symptoms persist. Check phenytoin levels if toxicity or loss of seizure control occurs.
What other medicines interact with Phenytoin?
MediHelp also lists interactions of Phenytoin with, for example, Artemether / lumefantrine, Bictegravir, Cabotegravir. The full list is on the Phenytoin page.
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