We can do better: a fresh look at echinocandin dosing
Open accessAbstract
First-line antifungal therapies are limited to azoles, polyenes and echinocandins, the former two of which are associated with high occurrences of severe treatment-emergent adverse events or frequent drug interactions. Among antifungals, echinocandins present a unique value proposition given their lower rates of toxic events as compared with azoles and polyenes. However, with the emergence of echinocandin-resistant Candida species and the fact that a pharmacometric approach to the development of anti-infective agents was not a mainstream practice at the time these agents were developed, we question whether echinocandins are being dosed optimally. This review presents pharmacokinetic/pharmacodynamic (PK/PD) evaluations for approved echinocandins (anidulafungin, caspofungin and micafungin) and rezafungin (previously CD101), an investigational agent. PK/PD-optimized regimens were evaluated to extend the utility of approved echinocandins when treating patients with resistant isolates. Although the benefits of these regimens were apparent, it was also clear that anidulafungin and micafungin, regardless of dosing adjustments, are unlikely to provide therapeutic exposures sufficient to treat highly resistant isolates. Day 1 probabilities of PK/PD target attainment of 5.2% and 85.1%, respectively, were achieved at the C. glabrata MIC90 (0.12 mg/L) and MIC97 (0.06 mg/L) values, respectively, for these agents. However, evaluations of rezafungin demonstrated high probabilities of target attainment over 4 weeks of therapy (100%) after administration of a single-dose regimen at the MIC90 of 0.06 mg/L. This signals that although existing therapies are not optimal to treat resistant organisms, more potent new echinocandins (relative to achievable drug exposures) may be on the horizon.
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Rezafungin has a prolonged half-life of around 133 h that allows extended-interval dosing and provides high plasma drug concentrations early in therapy.
“Rezafungin has a prolonged half-life (around 133 h) that allows extended-interval dosing and provides high plasma drug concentrations early in therapy.”
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- Authors
- Bader, J. C., Bhavnani, S. M., Andes, D. R., & Ambrose, P. G.
- Affiliations
- Institute for Clinical Pharmacodynamics (United States) (US)
- University of Wisconsin–Madison (US)
- Corresponding author
- Ambrose, Paul G
- Venue
- Journal of Antimicrobial Chemotherapy
- Publisher
- Oxford University Press (OUP)
- Published
- 2018-01-01
- Volume
- 73
- Issue
- suppl_1
- Pages
- i44-i50
- ISSN
- 0305-7453 (ISSN-L)
- 1460-2091
- OpenAlex
- W2782314309
- Cited by
- 46
- References
- 42
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 7 · 2023: 4 · 2022: 3 · 2021: 9 · 2020: 10 · 2019: 4 · 2018: 3 · 2017: 4
- FWCI
- 0.88
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Antimicrobial Chemotherapy (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Cidara Therapeutics
- Melinta Therapeutics
- Astellas Pharma
- Wockhardt
- Actelion Pharmaceuticals
- Topics
- Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
- Health Sciences › Medicine › Pharmacology › Antibiotics Pharmacokinetics and Efficacy
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Pharmaceutical studies and practices
- Keywords
- echinocandins, antifungal dosing, pharmacokinetic-pharmacodynamic modeling, probability of target attainment, anidulafungin, caspofungin, micafungin, rezafungin, Candida glabrata, echinocandin resistance, single-dose regimen, antifungal resistance
- MeSH terms
- Antifungal Agents, Humans, Echinocandins, Drug-Related Side Effects and Adverse Reactions
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