Drug interactions
Piperacillin + Voriconazole
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.
Overview
Piperacillin coadministration has been associated with falsely elevated voriconazole concentrations when measured by certain immunoassays, potentially leading to inappropriate dose adjustments. No consistent true pharmacokinetic interaction is established.
Mechanism of action
Analytical interference due to cross-reactivity in some voriconazole immunoassays (e.g., enzyme immunoassays); LC-MS/MS methods are not affected. No known CYP-mediated interaction.
Clinical management
Prefer LC-MS/MS for voriconazole therapeutic drug monitoring during piperacillin therapy. If an immunoassay is used, confirm unexpected results with LC-MS/MS before changing dose. Monitor for clinical efficacy and toxicity rather than relying solely on immunoassay levels.
Drug reference
References
- Therapeutic drug monitoring of antifungal agents — UpToDate
- Voriconazole: Drug Information (systemic) — Laboratory test interactions — Lexicomp
Frequently asked questions
Can I take Piperacillin with Voriconazole?
The interaction is rated: Moderate. Piperacillin coadministration has been associated with falsely elevated voriconazole concentrations when measured by certain immunoassays, potentially leading to inappropriate dose adjustments. No consistent true pharmacokinetic interaction is established.
How serious is the interaction between Piperacillin and Voriconazole?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Piperacillin and Voriconazole managed?
Prefer LC-MS/MS for voriconazole therapeutic drug monitoring during piperacillin therapy. If an immunoassay is used, confirm unexpected results with LC-MS/MS before changing dose. Monitor for clinical efficacy and toxicity rather than relying solely on immunoassay levels.
Why do Piperacillin and Voriconazole interact?
Analytical interference due to cross-reactivity in some voriconazole immunoassays (e.g., enzyme immunoassays); LC-MS/MS methods are not affected. No known CYP-mediated interaction.
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