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Does Isavuconazonium Sulfate Interact with Ritonavir?

CDI records a moderate classification for Isavuconazonium Sulfate and Ritonavir. The stored summary is: Lopinavir/ritonavir 400 mg of lopinavir in combination with 100 mg of ritonavir. Caution is advised when CRESEMBA is coadministered with lopinavir/ritonavir There is a 96% increase in exposure of isavuconazole when coadministered with lopinavir/ritonavir [see Clinical Pharmacology ( 12.3 )] . The Effect of CRESEMBA on the Pharmacokinetics of Other Drugs Recommendation Comments Lopinavir/ritonavir 400 mg of lopinavir in combination with 100 mg of ritonavir. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.

Evidence status

A current label comparison is not yet available for this record. The summary and severity are stored CDI information; they have not been independently validated on this page against the exact product label.

Confirm the medicine, formulation, route, and applicable warning with your pharmacist or prescriber. Independent clinical review has not been recorded.

Stored CDI classification: Moderate
Ritonavir Class: Cytochrome P450 3A Inhibitor
Management: Confirm exact products with your pharmacist
Data Source: U.S. FDA via OpenFDA

What To Tell Your Doctor or Pharmacist

If you are taking Isavuconazonium Sulfate and your doctor is considering prescribing Ritonavir (or vice versa), make sure to:

Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
Ask whether the benefits of combining these medications outweigh the risks for your specific situation
Ask what symptoms to watch for that would indicate the interaction is causing problems
Ask whether any dosage adjustments are needed
Never stop or change either medication without first consulting your healthcare provider

💊 Isavuconazonium Sulfate(Cresemba)+💊 Ritonavir(Norvir)

Severity & Interaction Details

🟡

moderate

Stored CDI classification: moderate

A current source comparison has not been recorded for this claim. The stored classification does not determine the clinical significance for your exact products or circumstances.

Severity scale

MinorContra

On record

Yes

Drug A class

—

Drug B class

Cytochrome P450 3A Inhibitor

Source

FDA drug label - isavuconazonium sulfate

What this means in plain English

Lopinavir/ritonavir 400 mg of lopinavir in combination with 100 mg of ritonavir. Caution is advised when CRESEMBA is coadministered with lopinavir/ritonavir There is a 96% increase in exposure of isavuconazole when coadministered with lopinavir/ritonavir [see Clinical Pharmacology ( 12.3 )] . The Effect of CRESEMBA on the Pharmacokinetics of Other Drugs Recommendation Comments Lopinavir/ritonavir 400 mg of lopinavir in combination with 100 mg of ritonavir.

About Isavuconazonium Sulfate and Ritonavir

Ritonavir is a Cytochrome P450 3A Inhibitor. You may recognize them by the brand names Cresemba and Norvir. Ritonavir additionally carries an FDA boxed warning, the FDA's strongest safety alert.

Source and Limitations

This record was produced by automated extraction from drug-label information, including AI processing. The summary and mechanism are not verbatim FDA quotations. The drug profiles below may describe different formulations from the source label. Confirm the exact product and route with your pharmacist. This page does not establish independent clinical review.

📖 Source: FDA drug label - isavuconazonium sulfate

Recent research & FDA safety updates

Live

Auto-aggregated from PubMed E-utilities and FDA safety data.

FDA

FDA Safety Alert: Multrys (Trace Elements Injection 4, USP), For intravenous infusion, packaged in a) 1 mL Single-Doseabout Isavuconazonium Sulfate · 2026-08

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How this information is prepared: CDI uses automated extraction, including AI, to summarize drug labeling from openFDA and includes separately identified curated-reference records. RxNorm helps identify medications; it does not verify interaction claims. Extracted summaries and CDI severity classifications can contain errors and are not verbatim FDA statements or independent clinical review. Maintained by CheckDrugInteractions.com. See our methodology or report a correction at support@checkdruginteractions.com.

Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine, supplemented with a small number of well-established interactions from curated clinical references. For informational purposes only. Always consult your pharmacist or physician.