Drug interactions
Caspofungin + Fosphenytoin
Severity: Moderate
Caspofungin and Fosphenytoin: 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
Fosphenytoin is converted to phenytoin, an inducer that can lower caspofungin concentrations. The clinical impact is uncertain but could reduce antifungal efficacy in serious infection.
What this interaction means in plain words
Caspofungin and Fosphenytoin 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.
Caspofungin belongs to Anti Fungals; Fosphenytoin belongs to Central Nervous System.
Why it happens
Phenytoin induces clearance pathways of caspofungin, lowering exposure.
What to do
Caspofungin labeling suggests considering a daily dose of 70 mg when given with inducers such as phenytoin in patients not responding adequately. Monitor clinical 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 Caspofungin
- Apalutamide + Caspofungin Moderate
- Carbamazepine + Caspofungin Moderate
- Caspofungin + Cyclosporin Moderate
- Caspofungin + Cyclosporine Moderate
- Caspofungin + Dexamethasone Moderate
- Caspofungin + Efavirenz Moderate
Other interactions of Fosphenytoin
- Dronedarone + Fosphenytoin Contraindicated
- Fosphenytoin + Ledipasvir-sofosbuvir Contraindicated
- Fosphenytoin + Lorlatinib Contraindicated
- Fosphenytoin + Lurasidone Contraindicated
- Fosphenytoin + Ranolazine Contraindicated
- Fosphenytoin + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Caspofungin with Fosphenytoin?
MediHelp rates the interaction as moderate. Caspofungin and Fosphenytoin 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. Fosphenytoin is converted to phenytoin, an inducer that can lower caspofungin concentrations. The clinical impact is uncertain but could reduce antifungal efficacy in serious infection.
How serious is the interaction between Caspofungin and Fosphenytoin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Caspofungin labeling suggests considering a daily dose of 70 mg when given with inducers such as phenytoin in patients not responding adequately. Monitor clinical response.
What other medicines interact with Caspofungin?
MediHelp also lists interactions of Caspofungin with, for example, Apalutamide, Carbamazepine, Cyclosporin. The full list is on the Caspofungin page.
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