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Antifungal serum concentration monitoring: an update

Megan L Goodwin1, Richard H Drew

  • 1Department of Pharmacy, Carilion Roanoke Memorial Hospital, Roanoke, VA, USA. mlgoodwin2005@gmail.com

The Journal of Antimicrobial Chemotherapy
|November 15, 2007
PubMed

Insights

Monitoring antifungal serum concentrations can optimize treatment for invasive fungal infections (IFIs). While not routine for all antifungals, it aids dosing for flucytosine, itraconazole, voriconazole, and posaconazole to improve outcomes and reduce toxicity.

Area of Science:

  • Pharmacology
  • Infectious Diseases
  • Clinical Pharmacy

Background:

  • Invasive fungal infections (IFIs) present a growing global health challenge, marked by increasing incidence and severe patient outcomes.
  • Optimizing antifungal therapy requires a deep understanding of pharmacokinetic and pharmacodynamic (PK/PD) properties to balance efficacy and toxicity.
  • Antifungal serum concentration monitoring is a potential tool for personalized dosing adjustments in specific clinical scenarios.

Purpose of the Study:

  • To evaluate the utility of serum concentration monitoring for various antifungal agents in managing invasive fungal infections.
  • To identify which antifungal classes and specific drugs may benefit from therapeutic drug monitoring (TDM) to enhance clinical outcomes.
  • To provide guidance on the current evidence supporting TDM for different antifungals, considering efficacy, safety, and PK variability.

Main Methods:

  • Review of existing clinical data and PK/PD studies on commonly used antifungal agents.
  • Analysis of evidence supporting or refuting the routine use of serum concentration monitoring for polyenes, echinocandins, flucytosine, itraconazole, voriconazole, and posaconazole.
  • Assessment of inter-patient variability in drug exposure and its correlation with clinical efficacy and toxicity.

Main Results:

  • Serum concentration monitoring is not routinely recommended for polyene and echinocandin antifungals due to insufficient data.
  • Monitoring flucytosine levels is advised to mitigate hematological toxicity risks.
  • Itraconazole monitoring is recommended for prolonged treatment of serious IFIs due to variable oral absorption. Monitoring of voriconazole and posaconazole is evolving, with ongoing research into PK/PD relationships and clinical utility.

Conclusions:

  • Therapeutic drug monitoring (TDM) of antifungal agents offers potential benefits for specific drugs and patient populations.
  • The evidence supports TDM for flucytosine and itraconazole to improve safety and efficacy in treating IFIs.
  • Further research is needed to establish clear guidelines for TDM of extended-spectrum triazoles like voriconazole and posaconazole.

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