Drug interactions
Phenytoin + Sevelamer
Severity: Minor
Phenytoin and Sevelamer: 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
Sevelamer is a non-absorbed phosphate binder, and no consistent interaction with phenytoin has been shown. Reduced phenytoin absorption through binding in the gut is conceivable but not well documented.
What this interaction means in plain words
Phenytoin and Sevelamer 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 belongs to Central Nervous System; Sevelamer belongs to Miscellaneous.
Why it happens
Possible binding of phenytoin in the gastrointestinal tract by sevelamer, which is not firmly established.
What to do
Give phenytoin at least 1 hour before or 3 hours after sevelamer, and check phenytoin levels if seizure control changes.
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 Sevelamer
- Carbamazepine + Sevelamer Moderate
- Ciprofloxacin + Sevelamer Moderate
- Dichlorphenamide + Sevelamer Moderate
- Erdafitinib + Sevelamer Moderate
- Gabapentin + Sevelamer Moderate
- Mycophenolic acid + Sevelamer Moderate
Frequently asked questions
Can I take Phenytoin with Sevelamer?
MediHelp rates the interaction as minor. Phenytoin and Sevelamer have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Sevelamer is a non-absorbed phosphate binder, and no consistent interaction with phenytoin has been shown. Reduced phenytoin absorption through binding in the gut is conceivable but not well documented.
How serious is the interaction between Phenytoin and Sevelamer?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give phenytoin at least 1 hour before or 3 hours after sevelamer, and check phenytoin levels if seizure control changes.
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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