Drug interactions
Iptacopan + Phenytoin
Severity: Moderate
Iptacopan and Phenytoin: moderate 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
Strong CYP2C8 inducers may reduce iptacopan exposure and efficacy. Phenytoin is an enzyme inducer, but the magnitude of this effect is not well defined.
What this interaction means in plain words
Iptacopan and Phenytoin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Iptacopan belongs to Miscellaneous; Phenytoin belongs to Central Nervous System.
Why it happens
Induction of CYP2C8-mediated iptacopan metabolism.
What to do
Monitor disease markers such as hemoglobin and LDH for reduced response.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Iptacopan
- Carbamazepine + Iptacopan Moderate
- Gemfibrozil + Iptacopan Moderate
- Iptacopan + Rifampicin Moderate
- Iptacopan + Secobarbital Moderate
Frequently asked questions
Can I take Iptacopan with Phenytoin?
MediHelp rates the interaction as moderate. Iptacopan and Phenytoin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Strong CYP2C8 inducers may reduce iptacopan exposure and efficacy. Phenytoin is an enzyme inducer, but the magnitude of this effect is not well defined.
How serious is the interaction between Iptacopan and Phenytoin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor disease markers such as hemoglobin and LDH for reduced response.
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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